670 lines
16 KiB
NASM
670 lines
16 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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.equ COMONUART1_READ_TIMEOUT = 3
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.equ COMONUART1_MSG_INTERVAL = 0
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.dseg
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comOnUart1_iface: .byte UART_HW_IFACE_SIZE
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.cseg
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_Init @global
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;
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; @clobbers Y (R16, R17, X)
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ComOnUart1_Init:
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1SetAttnInput ; (none)
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rcall UART_HW_Interface_Init ; (R16, R17, X)
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rcall comOnUart1Init ; (R16, R17, X)
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ldi r16, COMONUART1_IFACENUM
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std Y+NET_IFACE_OFFS_IFACENUM, r16
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inr r16, COM_IRQ_ADDR_ATTN1 ; enable pin change irq for ATTN line
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sbr r16, (1<<COM_IRQ_BIT_ATTN1)
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outr COM_IRQ_ADDR_ATTN1, r16
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in r16, GIMSK ; enable pin change irq PCIE0 or PCIE1
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sbr r16, (1<<COM_IRQ_GIMSK_ATTN1)
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out GIMSK, R16
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ldi r16, (1<<COM_IRQ_GIFR_ATTN1) ; clear pending irq by writing 1 to ATTN bit
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out GIFR, r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_Periodically @global
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;
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; @clobbers R16, Y
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ComOnUart1_Periodically:
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rjmp NET_Interface_Periodically
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_RxCharIsr @global @isr
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;
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; @clobbers none
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ComOnUart1_RxCharIsr:
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push r15
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in r15, SREG
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push r16
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push r17
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push r18
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push r24
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push r25
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push xl
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push xh
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push yl
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push yh
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1RxCharIsr ; (R16, R17, R18, R24, R25, X)
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pop yh
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pop yl
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pop xh
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pop xl
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pop r25
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pop r24
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pop r18
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pop r17
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pop r16
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out SREG, r15
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pop r15
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reti
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_TxUdreIsr @global @isr
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;
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; @clobbers none
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ComOnUart1_TxUdreIsr:
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push r15
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in r15, SREG
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push r16
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push r17
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push xl
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push xh
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push yl
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push yh
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1TxUdreIsr ; (R16, R17, X)
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pop yh
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pop yl
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pop xh
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pop xl
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pop r17
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pop r16
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out SREG, r15
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pop r15
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reti
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_TxCharIsr @global @isr
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;
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; @clobbers none
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ComOnUart1_TxCharIsr:
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push r15
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in r15, SREG
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push r16
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push r17
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push r18
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push xl
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push xh
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push yl
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push yh
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1TxCharIsr ; (R16, R17, R18, X)
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pop yh
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pop yl
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pop xh
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pop xl
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pop r18
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pop r17
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pop r16
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out SREG, r15
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pop r15
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reti
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_AttnChangeIsr @global @isr
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;
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; @clobbers none
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ComOnUart1_AttnChangeIsr:
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push r15
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in r15, SREG
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rcall ComOnUart1_HandleAttnChange
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out SREG, r15
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pop r15
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reti
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_HandleAttnChange @global
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;
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; @clobbers none
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ComOnUart1_HandleAttnChange:
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push r16
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push r17
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push r18
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push r24
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push r25
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push xl
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push xh
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push yl
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push yh
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1ActOnAttn ; (R16, R17, R24, R25, X)
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pop yh
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pop yl
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pop xh
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pop xl
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pop r25
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pop r24
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pop r18
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pop r17
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pop r16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1ActOnAttn @global
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;
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; @param Y pointer to interface data in SRAM
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; @clobbers R16 (R17, R24, R25, X)
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comOnUart1ActOnAttn:
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ldd r16, Y+UART_HW_IFACE_OFFS_WRITEMODE ; test for active write mode
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cpi r16, UART_HW_WRITEMODE_IDLE
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brne comOnUart1ActOnAttn_end ; in write mode, don't start read mode
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ldd r16, Y+UART_HW_IFACE_OFFS_READMODE ; test for active read mode
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cpi r16, UART_HW_READMODE_IDLE
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brne comOnUart1ActOnAttn_end ; already in read mode
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sbic COM_ATTN1_INPUT, COM_ATTN1_PIN ; ATTN high?
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rjmp comOnUart1ActOnAttn_end
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rcall comOnUart1StartReading ; (R16, R17, R24, R25, X)
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comOnUart1ActOnAttn_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1StartReading
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;
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; @clobbers R16 (R17, R24, R25, X)
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comOnUart1StartReading:
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rcall UART_HW_Interface_EnsureReadBuffer ; (R16, R17, R24, R25, X)
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brcs comOnUart1EnterReading_okay
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; no buffer, missed message
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ldi r16, NET_IFACE_OFFS_ERR_MISSED_LOW
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rcall NET_Interface_IncCounter16 ; (R24, R25)
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ret
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comOnUart1EnterReading_okay:
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ldi r16, UART_HW_READMODE_READING
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std Y+UART_HW_IFACE_OFFS_READMODE, r16
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clr r16
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std Y+NET_IFACE_OFFS_READTIMER, r16
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rcall comOnUart1StartRx ; R16
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1SendBuffer @global
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;
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; @param Y pointer to interface data in SRAM
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; @clobbers R16, R17
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comOnUart1SendBuffer:
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push r15
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in r15, SREG
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cli
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ldd r17, Y+UART_HW_IFACE_OFFS_WRITEMODE
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cpi r17, UART_HW_WRITEMODE_IDLE
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breq comOnUart1SendBuffer_setBuffer
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out SREG, r15
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pop r15
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clc
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ret
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comOnUart1SendBuffer_setBuffer:
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rcall UART_HW_Interface_SetWriteBuffer ; (R17)
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ldi r17, UART_HW_WRITEMODE_WRITING
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std Y+UART_HW_IFACE_OFFS_WRITEMODE, r17
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rcall comOnUart1StartTx ; (R16)
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pop r15
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out SREG, r15
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sec
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1ResetReadBuffer
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;
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; @clobbers R16 (R17, X)
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comOnUart1ResetReadBuffer:
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ldd r16, Y+UART_HW_IFACE_OFFS_READBUFNUM
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cpi r16, 0xff
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breq comOnUart1ResetReadBuffer_end
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rcall NET_Buffer_Locate ; (R17, X)
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rcall UART_HW_Interface_SetReadBuffer ; (R17)
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comOnUart1ResetReadBuffer_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ComOnUart1_Run @global
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;
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; @clobbers all
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ComOnUart1_Run:
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push r15
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in r15, SREG
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cli
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ldi yl, LOW(comOnUart1_iface)
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ldi yh, HIGH(comOnUart1_iface)
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rcall comOnUart1RunReadModes
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ldd r16, Y+UART_HW_IFACE_OFFS_READMODE ; test for active read mode
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cpi r16, UART_HW_READMODE_IDLE
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brne ComOnUart1_Run_end
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rcall comOnUart1RunWriteModes ; only call write routine if read idle
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ComOnUart1_Run_end:
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pop r15
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out SREG, r15
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunWriteModes
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;
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; @clobbers all, !Y
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comOnUart1RunWriteModes:
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ldd r16, Y+UART_HW_IFACE_OFFS_WRITEMODE ; handle write functions
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cpi r16, UART_HW_WRITEMODE_IDLE
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breq comOnUart1RunWriteIdle
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cpi r16, UART_HW_WRITEMODE_WRITING
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breq comOnUart1RunWriting
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cpi r16, UART_HW_WRITEMODE_WAITBUFFEREMPTY
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breq comOnUart1RunWaitBufferEmpty
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cpi r16, UART_HW_WRITEMODE_WRITEBUFFEREMPTY
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breq comOnUart1RunWriteBufferEmpty
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunWriteIdle
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;
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; @clobbers
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comOnUart1RunWriteIdle:
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ldd r16, Y+NET_IFACE_OFFS_WRITETIMER
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cpi r16, COMONUART1_MSG_INTERVAL ; wait a bit between messages
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brcs comOnUart1RunWriteIdle_end
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rcall NET_Interface_PeekNextOutgoingMsgNum ; r16=msgNum
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brcc comOnUart1RunWriteIdle_end ; no outmsg in queue
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sbis COM_ATTN1_INPUT, COM_ATTN1_PIN ; ATTN low?
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rjmp comOnUart1RunWriteIdle_end ; yes, line busy, jmp
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rcall comOnUart1SetAttnLow ; reserve bus as soon as possible
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Utils_WaitNanoSecs COM_BIT_LENGTH, 0, r22 ; wait for one bit duration
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Utils_WaitNanoSecs COM_BIT_LENGTH, 0, r22 ; wait for one bit duration
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rcall NET_Buffer_Locate ; (R17)
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rcall comOnUart1SendBuffer ; (R16, R17)
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rcall NET_Interface_GetNextOutgoingMsgNum ; take msg from queue (R17, R18, X)
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comOnUart1RunWriteIdle_end:
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ret
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunWriting
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;
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; @clobbers
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comOnUart1RunWriting:
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; TODO: check for timeout etc.
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunWaitBufferEmpty
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;
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; @clobbers none
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comOnUart1RunWaitBufferEmpty:
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; TODO: check for timeout etc.
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunWriteBufferEmpty
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;
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; @clobbers R16, R17, X
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comOnUart1RunWriteBufferEmpty:
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ldd r16, Y+UART_HW_IFACE_OFFS_WRITEBUFNUM
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ldi r17, 0xff
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cp r16, r17
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breq comOnUart1RunWriteBufferEmpty_setIdle
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std Y+UART_HW_IFACE_OFFS_WRITEBUFNUM, r17
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rcall NET_Buffer_ReleaseByNum ; (R16, X)
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comOnUart1RunWriteBufferEmpty_setIdle:
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rcall comOnUart1StopTx ; disable transceiver and interrupts (R16)
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rcall comOnUart1SetAttnInput ; set ATTN as input
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ldi r16, UART_HW_WRITEMODE_IDLE
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std Y+UART_HW_IFACE_OFFS_WRITEMODE, r16
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ldi r16, NET_IFACE_OFFS_PACKETSOUT_LOW ; increment packets counter
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rcall NET_Interface_IncCounter16 ; (R24, R25)
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunReadModes
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;
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; @clobbers all, !Y
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comOnUart1RunReadModes:
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ldd r16, Y+UART_HW_IFACE_OFFS_READMODE ; handle read functions
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cpi r16, UART_HW_READMODE_IDLE
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breq comOnUart1RunReadIdle ; (R16, R17, R24, R25, X)
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cpi r16, UART_HW_READMODE_READING
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breq comOnUart1RunReading ; (none)
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cpi r16, UART_HW_READMODE_SKIPPING
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breq comOnUart1RunSkipping ; (R16)
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cpi r16, UART_HW_READMODE_MSGRECEIVED
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breq comOnUart1RunMsgReceived ; (R16, R17, R18, R24, R25)
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunReadIdle
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;
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; @clobbers none
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comOnUart1RunReadIdle:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunReading
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;
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; @clobbers none
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comOnUart1RunReading:
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ret
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ldd r16, Y+NET_IFACE_OFFS_READTIMER
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cpi r16, COMONUART1_READ_TIMEOUT
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brcs comOnUart1RunReading_end
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rcall comOnUart1StopRx ; (R16)
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ldd r16, Y+UART_HW_IFACE_OFFS_READBUFNUM
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ldi r17, 0xff
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std Y+UART_HW_IFACE_OFFS_READBUFNUM, r17
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cp r16, r17
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breq comOnUart1RunReading_enterIdle
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rcall NET_Buffer_ReleaseByNum ; (R16, X)
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comOnUart1RunReading_enterIdle:
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ldi r16, UART_HW_READMODE_IDLE
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std Y+UART_HW_IFACE_OFFS_READMODE, r16
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comOnUart1RunReading_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunSkipping
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;
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; @clobbers R16
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comOnUart1RunSkipping:
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ldi r17, 0xff
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ldd r16, Y+UART_HW_IFACE_OFFS_READBUFNUM
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std Y+UART_HW_IFACE_OFFS_READBUFNUM, r17
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cp r16, r17
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breq comOnUart1RunSkipping_checkAttn
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rcall NET_Buffer_ReleaseByNum ; (R16, X)
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comOnUart1RunSkipping_checkAttn:
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sbis COM_ATTN1_INPUT, COM_ATTN1_PIN ; ATTN low?
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rjmp comOnUart1RunSkipping_end ; yes, jmp
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; ATTN ishigh, skipped message finished
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ldi r16, UART_HW_READMODE_IDLE
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std Y+UART_HW_IFACE_OFFS_READMODE, r16
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comOnUart1RunSkipping_end:
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1RunMsgReceived
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;
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; @clobbers R16 (R17, R18, R24, R25)
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comOnUart1RunMsgReceived:
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rjmp UART_HW_Interface_HandleMsgReceived
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1Init @global
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;
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; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_STATE)
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; @clobbers R16, R17, X
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comOnUart1Init:
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.ifdef COM_ATTN1_PUE
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lds r16, COM_ATTN1_PUE
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cbr r16, 1<<COM_ATTN1_PIN ; disable pullup on ATTN
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sts COM_ATTN1_PUE, r16
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.endif
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rcall comOnUart1SetAttnInput
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M_UART_HW_Uart_Init 1
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine comOnUart1StartRx @global
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;
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; @clobbers R16
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comOnUart1StartRx:
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M_UART_HW_Uart_StartRx 1
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ret
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; @end
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|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
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; @routine comOnUart1StopRx @global
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|
;
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|
; @clobbers R16
|
|
|
|
comOnUart1StopRx:
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|
M_UART_HW_Uart_StopRx 1
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|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1StartTx @global
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|
;
|
|
; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_STATE)
|
|
; @clobbers R16
|
|
|
|
comOnUart1StartTx:
|
|
M_UART_HW_Uart_StartTx 1
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1StopTx @global
|
|
;
|
|
; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_STATE)
|
|
; @clobbers R16
|
|
|
|
comOnUart1StopTx:
|
|
M_UART_HW_Uart_StopTx 1
|
|
ret
|
|
; @end
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1RxCharIsr @global
|
|
;
|
|
; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_MODE)
|
|
; @clobbers R16 (R17, R18, R24, R25, X)
|
|
|
|
comOnUart1RxCharIsr:
|
|
M_UART_HW_Uart_RxCharHalfDuplexIsr 1
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1TxUdreIsr @global
|
|
;
|
|
; Handler for UDRE1 interrupt called when TX data register is empty.
|
|
;
|
|
; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_MODE)
|
|
; @clobbers R16, R17, X
|
|
|
|
comOnUart1TxUdreIsr:
|
|
M_UART_HW_Uart_TxUdreIsr 1
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1TxCharIsr @global
|
|
;
|
|
; Handler for TXC1 interrupt called when a last byte has been completely sent and
|
|
; the data register is empty.
|
|
;
|
|
; @param Y pointer to interface data in SRAM (see @ref UART_HW_IFACE_OFFS_MODE)
|
|
; @clobbers R16
|
|
|
|
comOnUart1TxCharIsr:
|
|
M_UART_HW_Uart_TxCharIsr 1
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1SetAttnInput @global
|
|
;
|
|
; Set ATTN line as input (making it effectively HIGH due to pull-up resistor on
|
|
; the line)
|
|
;
|
|
; @clobbers none
|
|
|
|
comOnUart1SetAttnInput:
|
|
cbi COM_ATTN1_DDR, COM_ATTN1_PIN ; set ATTN as input
|
|
.ifdef COM_ATTN1_PUE
|
|
; cbi COM_ATTN1_PUE, COM_ATTN_PIN ; disable pullup on ATTN
|
|
.else
|
|
cbi COM_ATTN1_OUTPUT, COM_ATTN1_PIN ; disable pullup on ATTN
|
|
.endif
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine comOnUart1SetAttnLow @global
|
|
;
|
|
; Set ATTN line low.
|
|
;
|
|
; @clobbers none
|
|
|
|
comOnUart1SetAttnLow:
|
|
sbi COM_ATTN1_DDR, COM_ATTN1_PIN ; set ATTN as output
|
|
cbi COM_ATTN1_OUTPUT, COM_ATTN1_PIN ; set ATTN low
|
|
ret
|
|
; @end
|
|
|
|
|
|
|