From 08d420a8719f9f964c374e082bbc6f28e4a58440 Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Sat, 23 Aug 2025 00:08:25 +0200
Subject: [PATCH] avr: added module uart_fd

This module uses hardware UART of MCUs in full duplex mode.
---
 avr/devices/all/includes.asm    |  17 +
 avr/devices/all/main.asm        |   8 +
 avr/devices/all/modules.asm     |  23 ++
 avr/devices/t03/uartfd/main.asm | 259 ++++++++++++
 avr/modules/0BUILD              |   1 +
 avr/modules/uart_fd/0BUILD      |  13 +
 avr/modules/uart_fd/defs.asm    |  47 +++
 avr/modules/uart_fd/macros.asm  | 204 ++++++++++
 avr/modules/uart_fd/uartfd0.asm | 687 +++++++++++++++++++++++++++++++
 avr/modules/uart_fd/uartfd1.asm | 696 ++++++++++++++++++++++++++++++++
 10 files changed, 1955 insertions(+)
 create mode 100644 avr/devices/t03/uartfd/main.asm
 create mode 100644 avr/modules/uart_fd/0BUILD
 create mode 100644 avr/modules/uart_fd/defs.asm
 create mode 100644 avr/modules/uart_fd/macros.asm
 create mode 100644 avr/modules/uart_fd/uartfd0.asm
 create mode 100644 avr/modules/uart_fd/uartfd1.asm

diff --git a/avr/devices/all/includes.asm b/avr/devices/all/includes.asm
index e166c09..7755185 100644
--- a/avr/devices/all/includes.asm
+++ b/avr/devices/all/includes.asm
@@ -133,6 +133,23 @@
 #endif
 
 
+
+#ifdef MODULES_UARTFD0
+.include "modules/uart_fd/defs.asm"
+.include "modules/uart_fd/macros.asm"
+.include "modules/uart_fd/uartfd0.asm"
+#endif
+
+
+
+#ifdef MODULES_UARTFD1
+.include "modules/uart_fd/defs.asm"
+.include "modules/uart_fd/macros.asm"
+.include "modules/uart_fd/uartfd1.asm"
+#endif
+
+
+
 #ifdef MODULES_CLOCK
 .include "modules/clock/main.asm"
 #endif
diff --git a/avr/devices/all/main.asm b/avr/devices/all/main.asm
index 1615d36..5aaf331 100644
--- a/avr/devices/all/main.asm
+++ b/avr/devices/all/main.asm
@@ -127,6 +127,14 @@ onSystemTimerTick:
   bigcall TtyOnUart1_Periodically
 #endif
 
+#ifdef MODULES_UARTFD0
+  bigcall UARTFD0_Every100ms
+#endif
+
+#ifdef MODULES_UARTFD1
+  bigcall UARTFD1_Every100ms
+#endif
+
 #ifdef MODULES_COMONUART0
   bigcall ComOnUart0_Periodically
 #endif
diff --git a/avr/devices/all/modules.asm b/avr/devices/all/modules.asm
index 36862fe..d9be262 100644
--- a/avr/devices/all/modules.asm
+++ b/avr/devices/all/modules.asm
@@ -73,6 +73,14 @@ initModules:
   bigcall TtyOnUart1_Init
 #endif
 
+#ifdef MODULES_UARTFD0
+  bigcall UARTFD0_Init
+#endif
+
+#ifdef MODULES_UARTFD1
+  bigcall UARTFD1_Init
+#endif
+
 #ifdef MODULES_COMONUART0
   bigcall ComOnUart0_Init
 #endif
@@ -202,6 +210,21 @@ runModules:
   pop r16
 #endif
 
+
+#ifdef MODULES_UARTFD0
+  push r16
+    bigcall UARTFD0_Run
+  pop r16
+  sbci r16, 0
+#endif
+
+#ifdef MODULES_UARTFD1
+  push r16
+    bigcall UARTFD1_Run
+  pop r16
+  sbci r16, 0
+#endif
+
 #ifdef MODULES_COMONUART0
   push r16
     bigcall ComOnUart0_Run
diff --git a/avr/devices/t03/uartfd/main.asm b/avr/devices/t03/uartfd/main.asm
new file mode 100644
index 0000000..ca3dbaf
--- /dev/null
+++ b/avr/devices/t03/uartfd/main.asm
@@ -0,0 +1,259 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+
+
+
+; ***************************************************************************
+; Source file for temperature sensor node on AtTiny 84
+;
+; This is for the full system (i.e. not the boot loader).
+;
+; All definitions and changes should go into this file.
+;
+;
+; ***************************************************************************
+
+
+;.equ clock=1000000 ; Define the clock frequency
+.equ clock=8000000 ; Define the clock frequency
+
+
+.nolist
+.include "include/tn841def.inc" ; Define device ATtiny841
+.list
+
+.include "../defs.asm"
+.include "version.asm"
+;.include "defs_all.asm"
+
+.include "devices/all/defs.asm"
+
+.include "common/calls.asm"
+.include "common/utils_wait.asm"
+.include "common/utils_io.asm"
+
+
+
+; ***************************************************************************
+; defines
+
+; ---------------------------------------------------------------------------
+; generic
+
+.equ COMONUART0_IFACENUM = 1
+.equ TTYONUART1_IFACENUM = 2
+
+
+; ---------------------------------------------------------------------------
+; firmware settings including list of modules used
+
+
+#define MAIN_WITHOUT_MSG_HANDLING ; we do message handling ourselfes
+#define APP_STATS_NETDEV2
+#define APP_ROUTER_NO_ADDR_MGR
+
+#define MODULES_CLOCK
+;#define MODULES_COM
+;#define MODULES_COM_WITH_ADDR_PROTO
+;#define MODULES_LED
+#define MODULES_LED_SIMPLE
+;#define MODULES_TWI_MASTER
+;#define MODULES_LCD
+;#define LCD_MINIMAL_FONT
+;#define MODULES_SI7021
+;#define MODULES_STATS
+;#define MODULES_CNY70
+;#define MODULES_REED
+;#define MODULES_OWI_MASTER
+;#define MODULES_DS18B20
+;#define MODULES_MOTION
+#define MODULES_NETWORK
+#define MODULES_COM2W
+;#define MODULES_COMONUART0
+;#define MODULES_TTYONUART1
+#define MODULES_UARTFD1
+#define APPS_STATS
+;#define APPS_NETWORK
+#define APPS_ROUTER
+
+
+
+.equ NET_BUFFERS_NUM           = 10
+.equ NET_MSGNUMINBUF_SIZE      =  8 ; max buffer nums in ringbuffer (global incoming)
+.equ NET_IFACE_OUTMSGBUF_SIZE  =  8 ; max buffer nums in ringbuffer (per interface outbound)
+
+.equ UART_HW_MSGNUMINBUF_SIZE  = 8
+.equ UART_HW_MSGNUMOUTBUF_SIZE = 8
+
+
+
+; ---------------------------------------------------------------------------
+; defines for values
+
+.equ VALUE_ID_DS18B20_TEMP     = 0x06
+
+.equ VALUE_ID_LEDSIMPLE_TIMING = 0x88
+.equ VALUE_ID_ROUTER_SETRANGE  = 0x89
+
+
+
+.equ COM_DATA0_DDR      = COM_DATA_DDR
+.equ COM_DATA0_INPUT    = COM_DATA_INPUT
+.equ COM_DATA0_OUTPUT   = COM_DATA_OUTPUT
+.equ COM_DATA0_PUE      = COM_DATA_PUE
+.equ COM_DATA0_PIN      = COM_DATA_PIN
+
+.equ COM_CLK0_DDR       = COM_CLK_DDR
+.equ COM_CLK0_INPUT     = COM_CLK_INPUT
+.equ COM_CLK0_OUTPUT    = COM_CLK_OUTPUT
+.equ COM_CLK0_PUE       = COM_CLK_PUE
+.equ COM_CLK0_PIN       = COM_CLK_PIN
+
+.equ COM_IRQ_ADDR_CLK0  = COM_IRQ_ADDR_CLK
+.equ COM_IRQ_BIT_CLK0   = COM_IRQ_BIT_CLK
+.equ COM_IRQ_GIFR_CLK0  = COM_IRQ_GIFR_CLK
+.equ COM_IRQ_GIMSK_CLK0 = COM_IRQ_GIMSK_CLK
+
+
+; ***************************************************************************
+; code segment
+
+.cseg
+.org 000000
+
+
+
+; ---------------------------------------------------------------------------
+; Reset and interrupt vectors
+
+        rjmp BOOTLOADER_ADDR          ;  1: RESET             Reset vector  use this for flashed system
+	reti                          ;  2: INT0              External Interrupt Request 0
+        rjmp com2wPcintIsr            ;  3: PCINT0            Pin Change Interrupt 0
+	reti                          ;  4: PCINT1            Pin Change Interrupt 1
+	reti                          ;  5: WDT               Watchdog Time-out
+	reti                          ;  6: TIM1_CAPT         Timer/Counter1 Capture Event
+	reti                          ;  7: TIM1_COMPA (OC1A) Timer/Counter1 Compare Match A
+	reti                          ;  8: TIM1_COMPB (OC1B) Timer/Counter1 Compare Match B
+	reti                          ;  9: TIM1_OVF (OVF1)   Timer/Counter1 Overflow
+        rjmp baseTimerIrqOC0A         ; 10: TIM0_COMPA (OC0A) Timer/Counter0 Compare Match A
+	reti                          ; 11: TIM0_COMPB (OC0B) Timer/Counter0 Compare Match B
+	reti                          ; 12: TIM0_OVF (OVF0)   Timer/Counter0 Overflow
+	reti                          ; 13: ANA_COMP0         Analog Comparator 0
+        reti                          ; 14: ADC_READY         ADC Conversion Complete
+        reti                          ; 15: EE_RDY (ERDY)     EEPROM Ready
+        reti                          ; 16: ANA_COMP1         Analog Comparator 1
+        reti                          ; 17: TIM2_CAPT         Timer/Counter2 Capture Event
+        reti                          ; 18: TIM2_COMPA (OC2A) Timer/Counter2 Compare Match A
+        reti                          ; 19: TIM2_COMPB (OC2B) Timer/Counter2 Compare Match B
+        reti                          ; 20: TIM2_OVF (OVF2)   Timer/Counter2 Overflow
+        reti                          ; 21: SPI               SPI Serial Transfer Complete
+        reti                          ; 22: USART0_RXS        USART0 Rx Start
+;        rjmp ComOnUart0_RxCharIsr     ; 23: USART0_RXC        USART0 Rx Complete
+        reti                          ; 23: USART0_RXC        USART0 Rx Complete
+        reti                          ; 24: USART0_DRE        USART0 Data Register Empty
+        reti                          ; 25: USART0_TXC        USART0 Tx Complete
+        reti                          ; 26: USART1_RXS        USART1 Rx Start
+        rjmp UARTFD1_RxCharIsr        ; 27: USART1_RXC        USART1 Rx Complete
+        rjmp UARTFD1_TxUdreIsr        ; 28: USART1_DRE        USART1 Data Register Empty
+        rjmp UARTFD1_TxCharIsr        ; 29: USART1_TXC        USART1 Tx Complete
+        reti                          ; 30: TWI               Two-Wire-Interface
+        reti                          ; 31: RESERVED          reserved
+
+
+
+devInfoBlock:        ; 12 bytes
+devInfoManufacturer: .db 'A', 'Q', 'U', 'A'
+devInfoId:           .db DEVICEINFO_ID, 0
+devInfoVersion:      .db DEVICEINFO_VERSION, DEVICEINFO_REVISION             ; version, revision
+firmwareVersion:     .db FIRMWARE_VARIANT_TEMP_WINDOW, FIRMWARE_VERSION_MAJOR
+                     .db FIRMWARE_VERSION_MINOR, FIRMWARE_VERSION_PATCHLEVEL
+
+
+
+; ---------------------------------------------------------------------------
+; @routine firmwareStart @global
+
+firmwareStart:
+  rjmp main
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onSystemStart
+
+onSystemStart:
+  ldi r16, 0xf0
+  sts netInterfaceData+NET_IFACE_OFFS_ADDRESS, r16
+  sts netInterfaceData2+NET_IFACE_OFFS_ADDRESS, r16
+  ret
+; @end
+
+
+
+onEvery100ms:
+onEverySecond:
+onEveryMinute:
+onEveryHour:
+onEveryDay:
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onEveryLoop
+;
+; Called on every loop (i.e. after awakening from sleep).
+
+onEveryLoop:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine onMessageReceived
+;
+; Called on every message received
+
+onMessageReceived:
+  clc
+  ret
+; @end
+
+
+
+
+
+
+; ***************************************************************************
+; includes
+
+.include "devices/all/hw_tn841.asm"
+.include "devices/all/includes.asm"
+.include "common/debug.asm"
+
+
+
+
+; ---------------------------------------------------------------------------
+; defines for network interface
+
+.equ netInterfaceData  = uartFd1_iface
+.equ netInterfaceData2 = com2w_iface
+
+
+; debug
+push r18
+  push r19
+    rcall LedSimple_SetFastTiming
+  pop r19
+pop r18
+
diff --git a/avr/modules/0BUILD b/avr/modules/0BUILD
index 6b7dfdf..781cd54 100644
--- a/avr/modules/0BUILD
+++ b/avr/modules/0BUILD
@@ -31,6 +31,7 @@
     uart_bitbang
     uart_bitbang2
     uart_irq
+    uart_fd
     uart_hw
     bootloader
     f_keepup
diff --git a/avr/modules/uart_fd/0BUILD b/avr/modules/uart_fd/0BUILD
new file mode 100644
index 0000000..49f7dd3
--- /dev/null
+++ b/avr/modules/uart_fd/0BUILD
@@ -0,0 +1,13 @@
+<?xml?>
+
+<gwbuild>
+
+  <extradist>
+    defs.asm
+    macros.asm
+    uartfd0.asm
+  </extradist>
+
+</gwbuild>
+
+
diff --git a/avr/modules/uart_fd/defs.asm b/avr/modules/uart_fd/defs.asm
new file mode 100644
index 0000000..a095773
--- /dev/null
+++ b/avr/modules/uart_fd/defs.asm
@@ -0,0 +1,47 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AVR_MODULES_UARTFD_DEFS_ASM
+#define AVR_MODULES_UARTFD_DEFS_ASM
+
+
+.equ UARTFD_SKIPPING_TIME  = 2
+.equ UARTFD_READ_TIMEOUT   = 2
+.equ UARTFD_WRITE_TIMEOUT  = 2
+
+
+.equ UARTFD_IFACE_STATUS_BIT_OVERRUN    = 0
+.equ UARTFD_IFACE_STATUS_BIT_HWERR      = 1
+.equ UARTFD_IFACE_STATUS_BIT_BADMSGSIZE = 2
+.equ UARTFD_IFACE_STATUS_BIT_SKIPPING   = 3
+
+
+
+.equ UARTFD_IFACE_SIZE_BUFFER       = NET_BUFFERS_SIZE-1
+
+.equ UARTFD_IFACE_OFFS_BEGIN        = NET_IFACE_SIZE
+.equ   UARTFD_IFACE_OFFS_STATUS     = UARTFD_IFACE_OFFS_BEGIN
+.equ   UARTFD_IFACE_OFFS_WPOS_LOW   = UARTFD_IFACE_OFFS_BEGIN+1
+.equ   UARTFD_IFACE_OFFS_WPOS_HIGH  = UARTFD_IFACE_OFFS_BEGIN+2
+.equ   UARTFD_IFACE_OFFS_WBUFLEFT   = UARTFD_IFACE_OFFS_BEGIN+3
+.equ   UARTFD_IFACE_OFFS_WBUFNUM    = UARTFD_IFACE_OFFS_BEGIN+4
+.equ   UARTFD_IFACE_OFFS_RPOS_LOW   = UARTFD_IFACE_OFFS_BEGIN+5
+.equ   UARTFD_IFACE_OFFS_RPOS_HIGH  = UARTFD_IFACE_OFFS_BEGIN+6
+.equ   UARTFD_IFACE_OFFS_RBUFUSED   = UARTFD_IFACE_OFFS_BEGIN+7
+.equ   UARTFD_IFACE_OFFS_RBUFLEFT   = UARTFD_IFACE_OFFS_BEGIN+8
+.equ   UARTFD_IFACE_OFFS_RBUFFER    = UARTFD_IFACE_OFFS_BEGIN+9
+.equ UARTFD_IFACE_SIZE              = UARTFD_IFACE_OFFS_RBUFFER+UARTFD_IFACE_SIZE_BUFFER
+
+
+
+
+#endif
+
+
+
diff --git a/avr/modules/uart_fd/macros.asm b/avr/modules/uart_fd/macros.asm
new file mode 100644
index 0000000..3e5b72e
--- /dev/null
+++ b/avr/modules/uart_fd/macros.asm
@@ -0,0 +1,204 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AVR_MODULES_UARTFD_MACROS_ASM
+#define AVR_MODULES_UARTFD_MACROS_ASM
+
+
+.macro M_UARTFD_SET_CHARFORMAT
+  ldi r16, (1<<UCSZ@01) | (1<<UCSZ@00)      ; 1 stop bit, 8 databits
+  outr UCSR@0C, r16
+.endmacro
+
+
+
+.macro M_UARTFD_SET_BAUDRATE
+.if clock == 8000000
+  ldi r16, 25 ; (19.2Kb/s at 8MHz)
+  ldi r17, 0
+.elif clock == 1000000
+  ldi r16, 2  ; (19.2Kb/s at 1MHz)
+  ldi r17, 0  
+.else
+  .error "Unhandled clock frequency"
+.endif
+  outr UBRR@0H, r17
+  outr UBRR@0L, r16
+.endmacro
+
+
+
+.macro M_UARTFD_START_RX
+  inr r16, UCSR@0B
+  sbr r16, (1<<RXCIE@0) | (1<<RXEN@0)  ; enable RX complete interrupt, enable receive
+  outr UCSR@0B, r16
+.endmacro
+
+
+
+.macro M_UARTFD_STOP_RX
+  inr r16, UCSR@0B
+  cbr r16, (1<<RXCIE@0) | (1<<RXEN@0)  ; disable RX complete interrupt, disable receive
+  outr UCSR@0B, r16
+.endmacro
+
+
+
+.macro M_UARTFD_START_TX
+  inr r16, UCSR@0A
+  cbr r16, (1<<TXC@0)                                 ; clear TXCn interrupt
+  outr UCSR@0A, r16
+  inr r16, UCSR@0B
+  sbr r16, (1<<UDRIE@0) | (1<<TXCIE@0) | (1<<TXEN@0)  ; enable TX UDRE and TXC interrupt, enable transceive
+  outr UCSR@0B, r16
+.endmacro
+
+
+
+.macro M_UARTFD_STOP_TX
+  inr r16, UCSR@0B
+  cbr r16, (1<<UDRIE@0) | (1<<TXCIE@0) | (1<<TXEN@0)  ; disable TX UDRE and TXC1 interrupt, enable transceive
+  outr UCSR@0B, r16
+.endmacro
+
+
+
+; ---------------------------------------------------------------------------
+; @macro M_UARTFD_RXCHAR_ISR
+;
+; @clobbers r16, r17, X
+
+.macro M_UARTFD_RXCHAR_ISR
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  brne l_resetReadTimer_%                         ; skipping
+  inr r16, UCSR@0A                                ; check for errors
+  andi r16, (1<<FE@0) | (1<<DOR@0) | (1<<UPE@0)
+  brne l_hwerr_%
+  inr r16, UCSR@0A
+  sbrs r16, RXC@0
+    rjmp l_end_%                                  ; no data
+  inr r16, UDR@0                                  ; r16=received char
+  ldd r17, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  tst r17
+  breq l_overrun_%
+  dec r17
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r17
+  ldd r17, Y+UARTFD_IFACE_OFFS_RBUFUSED
+  inc r17
+  std Y+UARTFD_IFACE_OFFS_RBUFUSED, r17
+  ldd xl, Y+UARTFD_IFACE_OFFS_RPOS_LOW
+  ldd xh, Y+UARTFD_IFACE_OFFS_RPOS_HIGH
+  st X+, r16
+  std Y+UARTFD_IFACE_OFFS_RPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_RPOS_HIGH, xh
+  cpi r17, 2                                      ; exactly 2 bytes in buffer?
+  brne l_resetReadTimer_%
+  ; determine message size
+  inc r16                                         ; last byte was payload length, add byte for crc
+  ldd r17, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  cp r17, r16                                     ; compare remaining length against remaining space
+  brcs l_badMsgSize_%
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r16
+l_resetReadTimer_%:
+  clr r16
+  std Y+NET_IFACE_OFFS_READTIMER, r16             ; reset read timer
+  rjmp l_end_%
+l_hwerr_%:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  ori r16, (1<<UARTFD_IFACE_STATUS_BIT_HWERR) | (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  std Y+UARTFD_IFACE_OFFS_STATUS, r16
+  rjmp l_end_%
+l_badMsgSize_%:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  ori r16, (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE) | (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  std Y+UARTFD_IFACE_OFFS_STATUS, r16
+  rjmp l_end_%
+l_overrun_%:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  ori r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN) | (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  std Y+UARTFD_IFACE_OFFS_STATUS, r16
+l_end_%:
+.endmacro
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @macro M_UARTFD_TXUDRE_ISR
+;
+; @clobbers R16, R17, X
+
+.macro M_UARTFD_TXUDRE_ISR
+  lds r16, UCSR@0A                             ; check for UDRE flag
+  sbrs r16,UDRE@0
+    rjmp l_disable_irq_%                       ; not ready
+
+  ; check whether we have an active write buffer
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq l_disable_irq_%                         ; no buffer
+
+  ; check whether there is data in the buffer to send
+  ldd r17, Y+UARTFD_IFACE_OFFS_WBUFLEFT        ; r17=bytes left
+  tst r17
+  breq l_disable_irq_%                         ; nothing left to write
+  
+  ; get read ptr, read byte, inc read ptr, store ptr and bytesLeft
+  ldd xl, Y+UARTFD_IFACE_OFFS_WPOS_LOW
+  ldd xh, Y+UARTFD_IFACE_OFFS_WPOS_HIGH
+  ld r16, X+                                   ; r16=byte to write
+  std Y+UARTFD_IFACE_OFFS_WPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_WPOS_HIGH, xh
+  dec r17
+  std Y+UARTFD_IFACE_OFFS_WBUFLEFT, r17
+  
+  ; send byte, reset write timer
+  sts UDR@0, r16
+  clr r16
+  std Y+NET_IFACE_OFFS_WRITETIMER, r16         ; reset write timer
+
+  ; still bytes left to write?
+  tst r17
+  brne l_end_%
+l_disable_irq_%:
+  ; disable further UDRE interrupts
+  lds r16, UCSR@0B
+  cbr r16, (1<<UDRIE@0)                        ; disable TX data register empty interrupt
+  sts UCSR@0B, r16
+l_end_%:
+.endmacro
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @macro M_UARTFD_TXCHAR_ISR
+;
+; @clobbers R16, R17, X
+
+.macro M_UARTFD_TXCHAR_ISR
+  ; disable further TXC1 interrupts
+  inr r16, UCSR@0B
+  cbr r16, (1<<TXC@0)                          ; disable TXC interrupt
+  outr UCSR@0B, r16
+.endmacro
+; @end
+
+
+
+
+
+
+
+
+
+
+#endif
+
diff --git a/avr/modules/uart_fd/uartfd0.asm b/avr/modules/uart_fd/uartfd0.asm
new file mode 100644
index 0000000..b10ab20
--- /dev/null
+++ b/avr/modules/uart_fd/uartfd0.asm
@@ -0,0 +1,687 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AVR_MODULES_UARTFD_UARTFD0_ASM
+#define AVR_MODULES_UARTFD_UARTFD0_ASM
+
+
+
+.dseg
+
+uartFd0_iface: .bytes UARTFD_IFACE_SIZE
+
+
+
+.cseg
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD_Init @global
+;
+; @clobbers
+
+UARTFD0_Init:
+  ldi yl, LOW(uartFd0_iface)
+  ldi yh, HIGH(uartFd0_iface)
+  rcall NET_Interface_Init                ; (R16, R17, X)
+
+  ldi r16, 0xff
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  clr r16
+  std Y+UARTFD_IFACE_OFFS_WBUFLEFT, r16
+  std Y+UARTFD_IFACE_OFFS_RBUFUSED, r16
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r16
+
+  M_UARTFD_SET_BAUDRATE 0
+  M_UARTFD_SET_CHARFORMAT 0
+
+  ; always receive!
+  rcall uartFd0StartRx
+  
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD0_Every100ms @global
+;
+; @clobbers 
+
+UARTFD0_Every100ms:
+  ldi yl, LOW(uartFd0_iface)
+  ldi yh, HIGH(uartFd0_iface)
+  rcall NET_Interface_Periodically
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD0_Run @global
+;
+; @return CFLAG set if something done
+; @clobbers r22, (r16, r17, r18, r19, r20, r24, r25, X, Y, Z)
+
+UARTFD0_Run:
+  ldi yl, LOW(uartFd0_iface)
+  ldi yh, HIGH(uartFd0_iface)
+  clr r22
+
+  rcall uartFd0RunRead           ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+  sbci r22, 0
+
+  rcall uartFd0RunWrite          ; (r16, r17, r18, r19, r24, r25, X)
+  sbci r22, 0
+
+  tst r22
+  clc
+  breq UARTFD0_Run_ret
+  sec
+UARTFD0_Run_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0RunWrite
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r19 (r16, r18, r24, r25, X)
+
+uartFd0RunWrite:
+  clr r19
+  rcall uartFd0CheckWriting   ; (r16, X)
+  rcall uartFd0CheckMsgSent   ; (r16, r24, r25)
+  sbci r19, 0
+  rcall uartFd0CheckSendMsg   ; (r16, r17, r18, X)
+  sbci r19, 0
+  tst r19
+  clc
+  breq uartFd0RunWrite_ret
+  sec
+uartFd0RunWrite_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckWriting
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (X)
+
+uartFd0CheckWriting:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd0CheckWriting_ret
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFLEFT
+  tst r16
+  breq uartFd0CheckWriting_ret
+  ldd r16, Y+NET_IFACE_OFFS_WRITETIMER
+  cpi r16, UARTFD_WRITE_TIMEOUT
+  brcs uartFd0CheckWriting_ret
+  rcall uartFd0RestartWriting  ; (r16, X)
+uartFd0CheckWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckSendMsg
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, X)
+
+uartFd0CheckSendMsg:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  brne uartFd0CheckSendMsg_clcRet
+  rcall NET_Interface_GetNextOutgoingMsgNum    ; (R17, R18, X)
+  brcc uartFd0CheckSendMsg_ret
+  rcall uartFd0StartWriting                    ; (R16, R17, X)
+  sec
+  rjmp uartFd0CheckSendMsg_ret
+uartFd0CheckSendMsg_clcRet:
+  clc
+uartFd0CheckSendMsg_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckMsgSent
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r24, r25)
+
+uartFd0CheckMsgSent:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd0CheckMsgSent_clcRet
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFLEFT
+  tst r16
+  brne uartFd0CheckMsgSent_clcRet
+  rcall uartFd0FinishWriting             ; (r16, r24, r25)
+  sec
+  rjmp uartFd0CheckMsgSent_ret
+uartFd0CheckMsgSent_clcRet:
+  clc
+uartFd0CheckMsgSent_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0RunRead
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, r19, r20, r24, r25, X, Z)
+
+uartFd0RunRead:
+  ; make sure received messages are stored ASAP
+  rcall uartFd0CheckMsgReceived     ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+  push r15
+    in r15, SREG                    ; save CFLAG
+
+    ; handle errors
+    rcall uartFd0CheckOverrun       ; (r16, r24, r25)
+    rcall uartFd0CheckHwErr         ; (r16, r24, r25)
+    rcall uartFd0CheckBadMsgSize    ; (r16, r24, r25)
+    rcall uartFd0CheckSkipping      ; (R16, X)
+
+    ; clear error flags
+    ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+    cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN) | (1<<UARTFD_IFACE_STATUS_BIT_HWERR) | (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+    std Y+UARTFD_IFACE_OFFS_STATUS, r16
+
+    ; check timeout for reading
+    rcall uartFd0CheckReading
+    out SREG, r15                   ; restore CFLAG from uartFd0CheckMsgReceived
+  pop r15
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckSkipping
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (X)
+
+uartFd0CheckSkipping:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  breq uartFd0CheckSkipping_ret
+  ldd r16, Y+NET_IFACE_OFFS_READTIMER
+  cpi r16, UARTFD_SKIPPING_TIME
+  brcs uartFd0CheckSkipping_ret
+  ; leave skipping mode
+  push r15
+    in r15, SREG
+    cli
+    ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+    cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+    std Y+UARTFD_IFACE_OFFS_STATUS, r16
+    rcall uartFd0RestartReading                      ; (R16, X)
+    out SREG, r15
+  pop r15
+uartFd0CheckSkipping_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (X)
+
+uartFd0CheckReading:
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  tst r16
+  breq uartFd0CheckReading_ret
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFUSED
+  tst r16
+  brne uartFd0CheckReading_ret
+  ldd r16, Y+NET_IFACE_OFFS_READTIMER
+  cpi r16, UARTFD_READ_TIMEOUT
+  brcs uartFd0CheckReading_ret
+  rcall uartFd0RestartReading  ; (r16, X)
+uartFd0CheckReading_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckMsgReceived
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, r19, r20, r24, r25, X, Z)
+
+uartFd0CheckMsgReceived:
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  tst r16
+  brne uartFd0CheckMsgReceived_clcRet
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFUSED
+  tst r16
+  breq uartFd0CheckMsgReceived_clcRet
+  rcall uartFd0FinishReading             ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+  rcall uartFd0StartReading              ; (R16, X)
+  sec
+  rjmp uartFd0CheckMsgReceived_ret
+uartFd0CheckMsgReceived_clcRet:
+  clc
+uartFd0CheckMsgReceived_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckOverrun
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd0CheckOverrun:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN)
+  breq uartFd0CheckOverrun_end
+  ldi r16, NET_IFACE_OFFS_ERR_MISSED_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd0CheckOverrun_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckHwErr
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd0CheckHwErr:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_HWERR)
+  breq uartFd0CheckHwErr_end
+  ldi r16, NET_IFACE_OFFS_ERR_IO_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd0CheckHwErr_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0CheckBadMsgSize
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd0CheckBadMsgSize:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+  breq uartFd0CheckBadMsgSize_end
+  ldi r16, NET_IFACE_OFFS_ERR_MSGSIZE_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd0CheckBadMsgSize_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StartReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X
+
+uartFd0StartReading:
+  rjmp uartFd0RestartReading ; (R16, X)
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0RestartReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X
+
+uartFd0RestartReading:
+  mov xl, yl
+  mov xh, yh
+  adiw xh:xl, UARTFD_IFACE_OFFS_RBUFFER
+  std Y+UARTFD_IFACE_OFFS_RPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_RPOS_HIGH, xh
+  clr r16
+  std Y+UARTFD_IFACE_OFFS_RBUFUSED, r16
+  std Y+NET_IFACE_OFFS_READTIMER, r16
+  ldi r16, UARTFD_IFACE_SIZE_BUFFER
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r16
+  ; clear error flags
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN) | (1<<UARTFD_IFACE_STATUS_BIT_HWERR) | (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+  std Y+UARTFD_IFACE_OFFS_STATUS, r16
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0FinishReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r17, r18, X, Z (r19, r20, r24, r25)
+
+uartFd0FinishReading:
+  mov xl, yl
+  mov xh, yh
+  adiw xh:xl, UARTFD_IFACE_OFFS_RBUFFER
+  rcall NETMSG_CheckMessageInBuffer       ; (R16, R17, R18, R19, R20, X)
+  brcc uartFd0FinishReading_errorCrc
+  rcall NET_Buffer_Alloc                  ; R16=number, X=ptr (R16, R17, X)
+  brcc uartFd0FinishReading_errorMem
+  ldd r18, Y+NET_IFACE_OFFS_IFACENUM
+  ld r17, X
+  andi r17, 0xf0
+  or r17, r18
+  st X+, r17                              ; store interface number
+  ; copy to newly allocated buffer
+  mov zl, yl
+  mov zh, yh
+  adiw zh:zl, UARTFD_IFACE_OFFS_RBUFFER
+  ldd r17, Y+UARTFD_IFACE_OFFS_RBUFUSED
+uartFd0FinishReading_copyLoop:
+    ld r18, Z+
+    st X+, r18
+    dec r17
+  brne uartFd0FinishReading_copyLoop
+  rcall NET_AddIncomingMsgNum
+  brcs uartFd0FinishReading_msgSaved
+  rcall NET_Buffer_ReleaseByNum           ; (R16, X)
+  rjmp uartFd0FinishReading_errorMem
+uartFd0FinishReading_msgSaved:
+  ldi r16, NET_IFACE_OFFS_PACKETSIN_LOW
+  rjmp uartFd0FinishReading_incCounter
+uartFd0FinishReading_errorCrc:
+  ldi r16, NET_IFACE_OFFS_ERR_CONTENT_LOW
+  rjmp uartFd0FinishReading_incCounter
+uartFd0FinishReading_errorMem:
+  ldi r16, NET_IFACE_OFFS_ERR_NOBUF_LOW
+uartFd0FinishReading_incCounter:
+  rjmp NET_Interface_IncCounter16        ; (R24, R25)
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StartWriting
+;
+; @param R16 number of buffer to write
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X (R17)
+
+uartFd0StartWriting:
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  rjmp uartFd0RestartWriting
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0RestartWriting
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X (R17)
+
+uartFd0RestartWriting:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd0RestartWriting_ret
+  rcall NET_Buffer_Locate                 ; (R17)
+  brcc uartFd0RestartWriting_ret
+  adiw xh:xl, 1
+  adiw xh:xl, NETMSG_OFFS_MSGLEN
+  ld r16, X
+  sbiw xh:xl, NETMSG_OFFS_MSGLEN
+  subi r16, -3                             ; add destaddr, length, crc
+  std Y+UARTFD_IFACE_OFFS_WBUFLEFT, r16
+  std Y+UARTFD_IFACE_OFFS_WPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_WPOS_HIGH, xh
+  rcall uartFd0StartTx                    ; (r16)
+uartFd0RestartWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0FinishWriting
+;
+; @param R16 number of buffer to write
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (r24, r25)
+
+uartFd0FinishWriting:
+  rcall uartFd0StopTx                    ; (r16)
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd0FinishWriting_ret
+  rcall NET_Buffer_ReleaseByNum          ; (r16, X)
+  ldi r16, 0xff
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  ldi r16, NET_IFACE_OFFS_PACKETSOUT_LOW
+  rcall NET_Interface_IncCounter16       ; (R24, R25)
+uartFd0FinishWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StartRx
+;
+; @clobbers R16
+
+uartFd0StartRx:
+  M_UARTFD_START_RX 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StopRx
+;
+; @clobbers R16
+
+uartFd0StopRx:
+  M_UARTFD_STOP_RX 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StartTx
+;
+; @clobbers R16
+
+uartFd0StartTx:
+  M_UARTFD_START_TX 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0StopTx
+;
+; @clobbers R16
+
+uartFd0StopTx:
+  M_UARTFD_STOP_TX 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0RxChar
+;
+; @clobbers r16, r17, X
+
+uartFd0RxChar:
+  M_UARTFD_RXCHAR_ISR 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0TxUdre
+;
+; @clobbers r16, r17, X
+
+uartFd0TxUdre:
+  M_UARTFD_TXUDRE_ISR 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd0TxChar
+;
+; @clobbers 
+
+uartFd0TxChar:
+  M_UARTFD_TXCHAR_ISR 0
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD0_RxCharIsr @global @isr
+;
+; @clobbers none
+
+UARTFD0_RxCharIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd0_iface)
+        ldi yh, HIGH(uartFd0_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd0RxChar
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD0_TxUdreIsr @global @isr
+;
+; @clobbers none
+
+UARTFD0_TxUdreIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd0_iface)
+        ldi yh, HIGH(uartFd0_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd0TxUdre
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD0_TxCharIsr @global @isr
+;
+; @clobbers none
+
+UARTFD0_TxCharIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd0_iface)
+        ldi yh, HIGH(uartFd0_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd0TxChar
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+
+
+
+
+
+
+
+#endif
+
+
+
diff --git a/avr/modules/uart_fd/uartfd1.asm b/avr/modules/uart_fd/uartfd1.asm
new file mode 100644
index 0000000..51b4691
--- /dev/null
+++ b/avr/modules/uart_fd/uartfd1.asm
@@ -0,0 +1,696 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+#ifndef AVR_MODULES_UARTFD_UARTFD1_ASM
+#define AVR_MODULES_UARTFD_UARTFD1_ASM
+
+; this is the tested version!
+
+
+.dseg
+
+uartFd1_iface: .byte UARTFD_IFACE_SIZE
+
+
+
+.cseg
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD_Init @global
+;
+; @clobbers
+
+UARTFD1_Init:
+  ldi yl, LOW(uartFd1_iface)
+  ldi yh, HIGH(uartFd1_iface)
+  rcall NET_Interface_Init                ; (R16, R17, X)
+
+  ldi r16, 0xff
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  clr r16
+  std Y+UARTFD_IFACE_OFFS_WBUFLEFT, r16
+  std Y+UARTFD_IFACE_OFFS_RBUFUSED, r16
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r16
+
+  M_UARTFD_SET_BAUDRATE 0
+  M_UARTFD_SET_CHARFORMAT 0
+
+  ; always receive!
+  rcall uartFd1StartRx
+  
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD1_Every100ms @global
+;
+; @clobbers 
+
+UARTFD1_Every100ms:
+  ldi yl, LOW(uartFd1_iface)
+  ldi yh, HIGH(uartFd1_iface)
+  rcall NET_Interface_Periodically
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD1_Run @global
+;
+; @return CFLAG set if something done
+; @clobbers r22, (r16, r17, r18, r19, r20, r24, r25, X, Y, Z)
+
+UARTFD1_Run:
+  ldi yl, LOW(uartFd1_iface)
+  ldi yh, HIGH(uartFd1_iface)
+  clr r22
+
+  push r15
+    in r15, SREG
+    
+    cli                            ; disable irqs
+    rcall uartFd1RunRead           ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+    sbci r22, 0
+    out SREG, r15                  ; probably enable irqs
+  
+    cli                            ; disable irqs
+    rcall uartFd1RunWrite          ; (r16, r17, r18, r19, r24, r25, X)
+    sbci r22, 0
+
+    out SREG, r15                  ; probably enable irqs
+  pop r15
+
+  tst r22
+  clc
+  breq UARTFD1_Run_ret
+  sec
+UARTFD1_Run_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1RunWrite
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r19 (r16, r18, r24, r25, X)
+
+uartFd1RunWrite:
+  clr r19
+  rcall uartFd1CheckWriting   ; (r16, X)
+  rcall uartFd1CheckMsgSent   ; (r16, r24, r25)
+  sbci r19, 0
+  rcall uartFd1CheckSendMsg   ; (r16, r17, r18, X)
+  sbci r19, 0
+  tst r19
+  clc
+  breq uartFd1RunWrite_ret
+  sec
+uartFd1RunWrite_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckWriting
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (X)
+
+uartFd1CheckWriting:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd1CheckWriting_ret
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFLEFT
+  tst r16
+  breq uartFd1CheckWriting_ret
+  ldd r16, Y+NET_IFACE_OFFS_WRITETIMER
+  cpi r16, UARTFD_WRITE_TIMEOUT
+  brcs uartFd1CheckWriting_ret
+  rcall uartFd1RestartWriting  ; (r16, X)
+uartFd1CheckWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckSendMsg
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, X)
+
+uartFd1CheckSendMsg:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  brne uartFd1CheckSendMsg_clcRet
+  rcall NET_Interface_GetNextOutgoingMsgNum    ; (R17, R18, X)
+  brcc uartFd1CheckSendMsg_ret
+  rcall uartFd1StartWriting                    ; (R16, R17, X)
+  sec
+  rjmp uartFd1CheckSendMsg_ret
+uartFd1CheckSendMsg_clcRet:
+  clc
+uartFd1CheckSendMsg_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckMsgSent
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r24, r25)
+
+uartFd1CheckMsgSent:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd1CheckMsgSent_clcRet
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFLEFT
+  tst r16
+  brne uartFd1CheckMsgSent_clcRet
+  rcall uartFd1FinishWriting             ; (r16, r24, r25)
+  sec
+  rjmp uartFd1CheckMsgSent_ret
+uartFd1CheckMsgSent_clcRet:
+  clc
+uartFd1CheckMsgSent_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1RunRead
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, r19, r20, r24, r25, X, Z)
+
+uartFd1RunRead:
+  ; make sure received messages are stored ASAP
+  rcall uartFd1CheckMsgReceived     ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+  push r15
+    in r15, SREG                    ; save CFLAG
+
+    ; handle errors
+    rcall uartFd1CheckOverrun       ; (r16, r24, r25)
+    rcall uartFd1CheckHwErr         ; (r16, r24, r25)
+    rcall uartFd1CheckBadMsgSize    ; (r16, r24, r25)
+    rcall uartFd1CheckSkipping      ; (r16, X)
+
+    ; clear error flags
+    ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+    cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN) | (1<<UARTFD_IFACE_STATUS_BIT_HWERR) | (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+    std Y+UARTFD_IFACE_OFFS_STATUS, r16
+
+    ; check timeout for reading
+    rcall uartFd1CheckReading
+    out SREG, r15                   ; restore CFLAG from uartFd1CheckMsgReceived
+  pop r15
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckSkipping
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (X)
+
+uartFd1CheckSkipping:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+  breq uartFd1CheckSkipping_ret
+  ldd r16, Y+NET_IFACE_OFFS_READTIMER
+  cpi r16, UARTFD_SKIPPING_TIME
+  brcs uartFd1CheckSkipping_ret
+  ; leave skipping mode
+  push r15
+    in r15, SREG
+    cli
+    ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+    cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_SKIPPING)
+    std Y+UARTFD_IFACE_OFFS_STATUS, r16
+    rcall uartFd1RestartReading                      ; (R16, X)
+    out SREG, r15
+  pop r15
+uartFd1CheckSkipping_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (X)
+
+uartFd1CheckReading:
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  tst r16
+  breq uartFd1CheckReading_ret
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFUSED
+  tst r16
+  brne uartFd1CheckReading_ret
+  ldd r16, Y+NET_IFACE_OFFS_READTIMER
+  cpi r16, UARTFD_READ_TIMEOUT
+  brcs uartFd1CheckReading_ret
+  rcall uartFd1RestartReading  ; (r16, X)
+uartFd1CheckReading_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckMsgReceived
+;
+; @param Y pointer to interface data in SRAM
+; @return CFLAG set if something done
+; @clobbers r16 (r17, r18, r19, r20, r24, r25, X, Z)
+
+uartFd1CheckMsgReceived:
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFLEFT
+  tst r16
+  brne uartFd1CheckMsgReceived_clcRet
+  ldd r16, Y+UARTFD_IFACE_OFFS_RBUFUSED
+  tst r16
+  breq uartFd1CheckMsgReceived_clcRet
+  rcall uartFd1FinishReading             ; (r16, r17, r18, r19, r20, r24, r25, X, Z)
+  rcall uartFd1StartReading              ; (R16, X)
+  sec
+  rjmp uartFd1CheckMsgReceived_ret
+uartFd1CheckMsgReceived_clcRet:
+  clc
+uartFd1CheckMsgReceived_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckOverrun
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd1CheckOverrun:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN)
+  breq uartFd1CheckOverrun_end
+  ldi r16, NET_IFACE_OFFS_ERR_MISSED_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd1CheckOverrun_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckHwErr
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd1CheckHwErr:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_HWERR)
+  breq uartFd1CheckHwErr_end
+  ldi r16, NET_IFACE_OFFS_ERR_IO_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd1CheckHwErr_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1CheckBadMsgSize
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r24, r25
+
+uartFd1CheckBadMsgSize:
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  andi r16, (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+  breq uartFd1CheckBadMsgSize_end
+  ldi r16, NET_IFACE_OFFS_ERR_MSGSIZE_LOW
+  rcall NET_Interface_IncCounter16              ; (R24, R25)
+uartFd1CheckBadMsgSize_end:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StartReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X
+
+uartFd1StartReading:
+  rjmp uartFd1RestartReading ; (R16, X)
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1RestartReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X
+
+uartFd1RestartReading:
+  mov xl, yl
+  mov xh, yh
+  adiw xh:xl, UARTFD_IFACE_OFFS_RBUFFER
+  std Y+UARTFD_IFACE_OFFS_RPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_RPOS_HIGH, xh
+  clr r16
+  std Y+UARTFD_IFACE_OFFS_RBUFUSED, r16
+  std Y+NET_IFACE_OFFS_READTIMER, r16
+  ldi r16, UARTFD_IFACE_SIZE_BUFFER
+  std Y+UARTFD_IFACE_OFFS_RBUFLEFT, r16
+  ; clear error flags
+  ldd r16, Y+UARTFD_IFACE_OFFS_STATUS
+  cbr r16, (1<<UARTFD_IFACE_STATUS_BIT_OVERRUN) | (1<<UARTFD_IFACE_STATUS_BIT_HWERR) | (1<<UARTFD_IFACE_STATUS_BIT_BADMSGSIZE)
+  std Y+UARTFD_IFACE_OFFS_STATUS, r16
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1FinishReading
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers r16, r17, r18, X, Z (r19, r20, r24, r25)
+
+uartFd1FinishReading:
+  mov xl, yl
+  mov xh, yh
+  adiw xh:xl, UARTFD_IFACE_OFFS_RBUFFER
+  rcall NETMSG_CheckMessageInBuffer       ; (R16, R17, R18, R19, R20, X)
+  brcc uartFd1FinishReading_errorCrc
+  rcall NET_Buffer_Alloc                  ; R16=number, X=ptr (R16, R17, X)
+  brcc uartFd1FinishReading_errorMem
+  ldd r18, Y+NET_IFACE_OFFS_IFACENUM
+  ld r17, X
+  andi r17, 0xf0
+  or r17, r18
+  st X+, r17                              ; store interface number
+  ; copy to newly allocated buffer
+  mov zl, yl
+  mov zh, yh
+  adiw zh:zl, UARTFD_IFACE_OFFS_RBUFFER
+  ldd r17, Y+UARTFD_IFACE_OFFS_RBUFUSED
+uartFd1FinishReading_copyLoop:
+    ld r18, Z+
+    st X+, r18
+    dec r17
+  brne uartFd1FinishReading_copyLoop
+  rcall NET_AddIncomingMsgNum
+  brcs uartFd1FinishReading_msgSaved
+  rcall NET_Buffer_ReleaseByNum           ; (R16, X)
+  rjmp uartFd1FinishReading_errorMem
+uartFd1FinishReading_msgSaved:
+  ldi r16, NET_IFACE_OFFS_PACKETSIN_LOW
+  rjmp uartFd1FinishReading_incCounter
+uartFd1FinishReading_errorCrc:
+  ldi r16, NET_IFACE_OFFS_ERR_CONTENT_LOW
+  rjmp uartFd1FinishReading_incCounter
+uartFd1FinishReading_errorMem:
+  ldi r16, NET_IFACE_OFFS_ERR_NOBUF_LOW
+uartFd1FinishReading_incCounter:
+  rjmp NET_Interface_IncCounter16        ; (R24, R25)
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StartWriting
+;
+; @param R16 number of buffer to write
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X (R17)
+
+uartFd1StartWriting:
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  rjmp uartFd1RestartWriting
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1RestartWriting
+;
+; @param Y pointer to interface data in SRAM
+; @clobbers R16, X (R17)
+
+uartFd1RestartWriting:
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd1RestartWriting_ret
+  rcall NET_Buffer_Locate                 ; (R17)
+  brcc uartFd1RestartWriting_ret
+  adiw xh:xl, 1
+  adiw xh:xl, NETMSG_OFFS_MSGLEN
+  ld r16, X
+  sbiw xh:xl, NETMSG_OFFS_MSGLEN
+  subi r16, -3                             ; add destaddr, length, crc
+  std Y+UARTFD_IFACE_OFFS_WBUFLEFT, r16
+  std Y+UARTFD_IFACE_OFFS_WPOS_LOW, xl
+  std Y+UARTFD_IFACE_OFFS_WPOS_HIGH, xh
+  rcall uartFd1StartTx                    ; (r16)
+uartFd1RestartWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1FinishWriting
+;
+; @param R16 number of buffer to write
+; @param Y pointer to interface data in SRAM
+; @clobbers r16 (r24, r25)
+
+uartFd1FinishWriting:
+  rcall uartFd1StopTx                    ; (r16)
+  ldd r16, Y+UARTFD_IFACE_OFFS_WBUFNUM
+  cpi r16, 0xff
+  breq uartFd1FinishWriting_ret
+  rcall NET_Buffer_ReleaseByNum          ; (r16, X)
+  ldi r16, 0xff
+  std Y+UARTFD_IFACE_OFFS_WBUFNUM, r16
+  ldi r16, NET_IFACE_OFFS_PACKETSOUT_LOW
+  rcall NET_Interface_IncCounter16       ; (R24, R25)
+uartFd1FinishWriting_ret:
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StartRx
+;
+; @clobbers R16
+
+uartFd1StartRx:
+  M_UARTFD_START_RX 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StopRx
+;
+; @clobbers R16
+
+uartFd1StopRx:
+  M_UARTFD_STOP_RX 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StartTx
+;
+; @clobbers R16
+
+uartFd1StartTx:
+  M_UARTFD_START_TX 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1StopTx
+;
+; @clobbers R16
+
+uartFd1StopTx:
+  M_UARTFD_STOP_TX 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1RxChar
+;
+; @clobbers r16, r17, X
+
+uartFd1RxChar:
+  M_UARTFD_RXCHAR_ISR 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1TxUdre
+;
+; @clobbers r16, r17, X
+
+uartFd1TxUdre:
+  M_UARTFD_TXUDRE_ISR 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine uartFd1TxChar
+;
+; @clobbers 
+
+uartFd1TxChar:
+  M_UARTFD_TXCHAR_ISR 1
+  ret
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD1_RxCharIsr @global @isr
+;
+; @clobbers none
+
+UARTFD1_RxCharIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd1_iface)
+        ldi yh, HIGH(uartFd1_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd1RxChar
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD1_TxUdreIsr @global @isr
+;
+; @clobbers none
+
+UARTFD1_TxUdreIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd1_iface)
+        ldi yh, HIGH(uartFd1_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd1TxUdre
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+; ---------------------------------------------------------------------------
+; @routine UARTFD1_TxCharIsr @global @isr
+;
+; @clobbers none
+
+UARTFD1_TxCharIsr:
+  push r15
+    in r15, SREG
+    push yl
+      push yh
+        ldi yl, LOW(uartFd1_iface)
+        ldi yh, HIGH(uartFd1_iface)
+        push r16
+          push r17
+            push xl
+              push xh
+                rcall uartFd1TxChar
+              pop xh
+            pop xl
+          pop r17
+        pop r16
+      pop yh
+    pop yl
+    out SREG, r15
+  pop r15
+  reti
+; @end
+
+
+
+
+
+
+
+
+
+
+#endif
+
+
+