102 lines
2.4 KiB
NASM
102 lines
2.4 KiB
NASM
; ***************************************************************************
|
|
; 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. *
|
|
; ***************************************************************************
|
|
|
|
|
|
.dseg
|
|
|
|
uartHwDataBegin:
|
|
; fixed buffers for incoming and outgoing messages
|
|
uartHw_buffers: .byte UART_HW_FIXEDBUFFERS_NUM*UART_HW_FIXEDBUFFERS_SIZE
|
|
uartHwDataEnd:
|
|
|
|
|
|
|
|
.cseg
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine UART_HW_FixedBuffers_Init @global
|
|
;
|
|
; @clobbers R16, R17, X
|
|
|
|
UART_HW_FixedBuffers_Init:
|
|
ldi xl, LOW(uartHw_buffers)
|
|
ldi xh, HIGH(uartHw_buffers)
|
|
m_fixedbuf_init UART_HW_FIXEDBUFFERS_SIZE, UART_HW_FIXEDBUFFERS_NUM
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine UART_HW_FixedBuffers_Alloc @global
|
|
;
|
|
; @return CFLAG set if buffer available, cleared otherwise
|
|
; @return r16 buffer num
|
|
; @return X pointer to start of buffer
|
|
; @clobbers R16, R17, X
|
|
|
|
UART_HW_FixedBuffers_Alloc:
|
|
ldi xl, LOW(uartHw_buffers)
|
|
ldi xh, HIGH(uartHw_buffers)
|
|
m_fixedbuf_reserve UART_HW_FIXEDBUFFERS_SIZE, UART_HW_FIXEDBUFFERS_NUM
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine UART_HW_FixedBuffers_Release @global
|
|
;
|
|
; @param X pointer to start of buffers
|
|
; @clobbers R16
|
|
|
|
UART_HW_FixedBuffers_Release:
|
|
m_fixedbuf_release
|
|
ret
|
|
; @end
|
|
|
|
|
|
|
|
; ---------------------------------------------------------------------------
|
|
; @routine UART_HW_FixedBuffers_Locate
|
|
;
|
|
; Get position of a given buffer.
|
|
;
|
|
; CAVE: need to change this routine if UART_HW_FIXEDBUFFERS_SIZE is changed!
|
|
;
|
|
; @return CFLAG set if okay, cleared on error
|
|
; @return X points to start of buffer with the given num
|
|
; @param r16 buffer num (0-max)
|
|
; @clobbers r16
|
|
|
|
UART_HW_FixedBuffers_Locate:
|
|
cpi r16, UART_HW_FIXEDBUFFERS_NUM
|
|
brcc UART_HW_FixedBuffers_Locate_end ; out of range
|
|
mov xh, r16 ; * 256
|
|
clr xl
|
|
lsr xh ; *128
|
|
ror xl
|
|
lsr xh ; *64
|
|
ror xl
|
|
lsr xh ; *32
|
|
ror xl
|
|
ldi r16, LOW(uartHw_buffers)
|
|
add xl, r16
|
|
ldi r16, HIGH(uartHw_buffers)
|
|
adc xh, r16
|
|
sec
|
|
UART_HW_FixedBuffers_Locate_end:
|
|
ret
|
|
; @end
|
|
|
|
|
|
|