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uart bitbang2 now also works on c01!

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This commit is contained in:
Martin Preuss
2025-06-01 00:21:07 +02:00
parent 8d1661d8e4
commit 120e3e1e6b
3 changed files with 43 additions and 3 deletions
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32
avr/modules/uart_bitbang2/iface.asm
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@@ -55,12 +55,41 @@ UART_BitBang_Init:
cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable internal pullup for ATTN
; enable IRQ
.ifdef INT0
.if COM_IRQ_BIT_ATTN == INT0
inr r16, MCUCR
cbr r16, (1<<ISC01) | (1<<ISC00)
sbr r16, (1<<ISC01) | (0<<ISC00) ; falling edge of ATTN
outr MCUCR, r16
; sbr r16, (0<<ISC01) | (0<<ISC00) ; low level triggers
inr r16, COM_IRQ_ADDR_ATTN ; enable irq for ATTN line
sbr r16, (1<<COM_IRQ_BIT_ATTN)
outr COM_IRQ_ADDR_ATTN, r16
.else
sbi COM_IRQ_ADDR_ATTN, COM_IRQ_BIT_ATTN ; enable pin change irq for ATTN line
in r16, GIMSK ; enable pin change irq PCIE0 or PCIE1
ori r16, (1<<COM_IRQ_GIMSK_ATTN)
out GIMSK, R16
ldi r16, (1<<COM_IRQ_GIFR_ATTN) ; clear pending irq by writing 1 to ATTN bit
out GIFR, r16
.endif
.else
sbi COM_IRQ_ADDR_ATTN, COM_IRQ_BIT_ATTN ; enable pin change irq for ATTN line
in r16, GIMSK ; enable pin change irq PCIE0 or PCIE1
ori r16, (1<<COM_IRQ_GIMSK_ATTN)
out GIMSK, R16
ldi r16, (1<<COM_IRQ_GIFR_ATTN) ; clear pending irq by writing 1 to ATTN bit
out GIFR, r16
.endif
#if 0
sbi COM_IRQ_ADDR_ATTN, COM_IRQ_BIT_ATTN ; enable pin change irq for ATTN line
in r16, GIMSK ; enable pin change irq PCIE0 or PCIE1
ori r16, (1<<COM_IRQ_GIMSK_ATTN)
out GIMSK, R16
ldi r16, (1<<COM_IRQ_GIFR_ATTN) ; clear pending irq by writing 1 to ATTN bit
out GIFR, r16
#endif
sec
ret
@@ -78,6 +107,7 @@ UART_BitBang_Fini:
cbi COM_DATA_DDR, COM_DATA_PIN ; set TXD port as input
cbi COM_ATTN_DDR, COM_ATTN_PIN ; set ATTN port as input
#if 0
cbi COM_IRQ_ADDR_ATTN, COM_IRQ_BIT_ATTN ; disable pin change irq for ATTN line
in r16, GIMSK ; enable pin change irq PCIE0 or PCIE1
andi r16, ~(1<<COM_IRQ_GIMSK_ATTN)
@@ -85,6 +115,8 @@ UART_BitBang_Fini:
ldi r16, (1<<COM_IRQ_GIFR_ATTN) ; clear pending irq by writing 1 to ATTN bit
out GIFR, r16
#endif
ret
; @end