; ***************************************************************************
; 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.   *
; ***************************************************************************


.equ UART_HW_STATE_OFF                 = 0
.equ UART_HW_STATE_IDLE                = 1
.equ UART_HW_STATE_READING             = 2
.equ UART_HW_STATE_WRITING             = 3
.equ UART_HW_STATE_SKIPPING            = 4

.equ UART_HW_IFACE_MSGIDBUF_SIZE       = 8
.equ UART_HW_IFACE_READBUF_SIZE        = 24


.equ UART_HW_IFACE_OFFS_STATE          = 0

.equ UART_HW_IFACE_OFFS_READBUFFERNUM  = 1  ; num of buffer currently read
.equ UART_HW_IFACE_OFFS_READBUFFERPOS  = 2  ; current pos in readbuffer
.equ UART_HW_IFACE_OFFS_READBUFFERLEFT = 3  ; bytes left to read for current message

.equ UART_HW_IFACE_OFFS_WRITEBUFFERID  = 4  ; num of buffer currently written from to network
.equ UART_HW_IFACE_OFFS_WRITEBUFFERPOS = 5  ; current pos in writebuffer
.equ UART_HW_IFACE_OFFS_WRITEBUFFERLEFT= 6  ; bytes left to write for current message


.equ UART_HW_IFACE_OFFS_RINGBUF_USED   = 7  ; ringbuffer for incoming chars
.equ UART_HW_IFACE_OFFS_RINGBUF_RDPOS  = 8
.equ UART_HW_IFACE_OFFS_RINGBUF_WRPOS  = 9

.equ UART_HW_IFACE_OFFS_MSGIDBUF_USED  = 10 ; ringbuffer for ids of outbound messages
.equ UART_HW_IFACE_OFFS_MSGIDBUF_RDPOS = 11
.equ UART_HW_IFACE_OFFS_MSGIDBUF_WRPOS = 12
.equ UART_HW_IFACE_OFFS_RINGBUF_DATA   = 13
.equ UART_HW_IFACE_OFFS_MSGIDBUF_DATA  = UART_HW_IFACE_OFFS_RINGBUF_DATA+UART_HW_IFACE_READBUF_SIZE

.equ UART_HW_IFACE_SIZE                = UART_HW_IFACE_OFFS_MSGIDBUF_DATA+UART_HW_IFACE_MSGIDBUF_SIZE


.equ UART_HW_IFACE_FN_ISR_CHECKATTN    = 0
.equ UART_HW_IFACE_FN_ISR_READCHAR     = 1
.equ UART_HW_IFACE_FN_ISR_WRITECHAR    = 2
.equ UART_HW_IFACE_FN_COUNT            = 3