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sending works again with n20.

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This commit is contained in:
Martin Preuss
2025-05-31 14:20:05 +02:00
parent 0b8cb929b7
commit 061119819f
3 changed files with 95 additions and 77 deletions
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67
avr/modules/uart_bitbang2/bytelevel.asm
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@@ -104,33 +104,28 @@ uartBitbang_SendByte_loop: ; 11 for low bit
uartBitbang_SendByte_setLow:
sbi COM_DATA_DDR, COM_DATA_PIN ; +2 set DATA as output
cbi COM_DATA_OUTPUT, COM_DATA_PIN ; +2 set DATA low
Utils_WaitNanoSecs COM_BIT_LENGTH, 11, r22
rjmp uartBitbang_SendByte_loopEnd ; +2
rjmp uartBitbang_SendByte_wait ; +2
uartBitbang_SendByte_setHigh:
cbi COM_DATA_DDR, COM_DATA_PIN ; +2 set DATA as input, pullup R makes it ONE
nop ; +1 (to make pin change available)
Utils_WaitNanoSecs COM_HALFBIT_LENGTH, 0, r22 ; wait for half a bit length for line to safely settle
sbis COM_DATA_INPUT, COM_DATA_PIN ; +1 if no skip, +2 if skipped
rjmp uartBitbang_SendByte_error ; +2 if error (collision: we wanted line to be high but it is low)
Utils_WaitNanoSecs COM_HALFBIT_LENGTH, 11, r22
cbi COM_DATA_DDR, COM_DATA_PIN ; +2 set DATA as input, pullup R makes it ONE
Utils_WaitNanoSecs COM_BIT_LENGTH, 8, r22
cbi COM_DATA_OUTPUT, COM_DATA_PIN ; +2 disable internal pullup for DATA
nop ; +1
nop ; +1
uartBitbang_SendByte_wait:
Utils_WaitNanoSecs COM_BIT_LENGTH, 12, r22
uartBitbang_SendByte_loopEnd:
dec r21 ; +1
brne uartBitbang_SendByte_loop ; +2, sum per loop: 11 cycles
; send stopbit
cbi COM_DATA_DDR, COM_DATA_PIN ; +2 set DATA as input, pullup R makes it ONE
Utils_WaitNanoSecs COM_BIT_LENGTH, 0, r22 ; wait for one bit length
cbi COM_DATA_OUTPUT, COM_DATA_PIN ; +2 disable internal pullup for DATA
Utils_WaitNanoSecs COM_BIT_LENGTH, 1, r22 ; wait for one bit length
sec
ret
uartBitbang_SendByte_error:
clc
ret
; @end
; ---------------------------------------------------------------------------
; @routine uartBitbangReceiveByte
;
@@ -204,50 +199,6 @@ uartBitbang_WaitForDataHigh:
; ---------------------------------------------------------------------------
; @routine uartBitbang_WaitForAttnHigh
;
; Wait up to 1ms for data pin to become high
; @return CFLAG set if okay, clear otherwise
; @clobbers R17, R22
uartBitbang_WaitForAttnHigh:
cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN port as input
cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable internal pullup for ATTN
UART_BB_M_WAIT_FOR_PIN_HIGH COM_ATTN_INPUT, COM_ATTN_PIN
ret
; @end
; ---------------------------------------------------------------------------
; @routine uartBitbang_AcquireBus
;
; Reserve bus if free (otherwise return error)
; Expects interrupts to be disabled.
;
; @return CFLAG set if okay (bus acquired), cleared on error
; @clobbers: none
uartBitbang_AcquireBus:
; check for ATTN line: busy?
cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN as input
cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable pullup on ATTN
nop ; needed to sample current input
sbis COM_ATTN_INPUT, COM_ATTN_PIN ; ATTN low?
rjmp uartBitbang_AcquireBus_busy ; jump if it is
sbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN as output
cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; set ATTN low
sec
ret
uartBitbang_AcquireBus_busy:
clc
ret
; @end
; ---------------------------------------------------------------------------
; @routine uartBitbang_WaitForOneBitLength
;