; ***************************************************************************
; 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_IFACE_READBUF_SIZE        = 8
.equ UART_HW_IFACE_WRITEBUF_SIZE       = 8


.equ UART_HW_MODE_OFF                  = 0
.equ UART_HW_MODE_IDLE                 = 1
.equ UART_HW_MODE_READING              = 2
.equ UART_HW_MODE_WRITING              = 4
.equ UART_HW_MODE_SKIPPING             = 8


.equ UART_HW_STATUS_UNDERRUN           = 0x01
.equ UART_HW_STATUS_OVERRUN            = 0x02
.equ UART_HW_STATUS_HWERR              = 0x04
.equ UART_HW_STATUS_ATTN               = 0x80


.equ UART_HW_IFACE_OFFS_MODE           = 0
.equ UART_HW_IFACE_OFFS_STATUS         = 1
.equ UART_HW_IFACE_OFFS_READTIMER      = 2

.equ UART_HW_IFACE_OFFS_READBUF        = 3  ; ringbuffer for incoming chars
.equ UART_HW_IFACE_OFFS_READBUF_MAX    = UART_HW_IFACE_OFFS_READBUF
.equ UART_HW_IFACE_OFFS_READBUF_USED   = UART_HW_IFACE_OFFS_READBUF+1
.equ UART_HW_IFACE_OFFS_READBUF_RDPOS  = UART_HW_IFACE_OFFS_READBUF+2
.equ UART_HW_IFACE_OFFS_READBUF_WRPOS  = UART_HW_IFACE_OFFS_READBUF+3
.equ UART_HW_IFACE_OFFS_READBUF_DATA   = UART_HW_IFACE_OFFS_READBUF+4 ; UART_HW_IFACE_READBUF_SIZE bytes

.equ UART_HW_IFACE_OFFS_WRITEBUF       = UART_HW_IFACE_OFFS_READBUF_DATA+UART_HW_IFACE_READBUF_SIZE
.equ UART_HW_IFACE_OFFS_WRITEBUF_MAX   = UART_HW_IFACE_OFFS_WRITEBUF
.equ UART_HW_IFACE_OFFS_WRITEBUF_USED  = UART_HW_IFACE_OFFS_WRITEBUF+1
.equ UART_HW_IFACE_OFFS_WRITEBUF_RDPOS = UART_HW_IFACE_OFFS_WRITEBUF+2
.equ UART_HW_IFACE_OFFS_WRITEBUF_WRPOS = UART_HW_IFACE_OFFS_WRITEBUF+3
.equ UART_HW_IFACE_OFFS_WRITEBUF_DATA  = UART_HW_IFACE_OFFS_WRITEBUF+4

.equ UART_HW_IFACE_SIZE                = UART_HW_IFACE_OFFS_WRITEBUF_DATA+UART_HW_IFACE_WRITEBUF_SIZE