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avr: wait for free CLK line on error when in flash mode

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This commit is contained in:
Martin Preuss
2025-08-23 00:09:39 +02:00
parent 5013bb8e29
commit 87788fa93c
1 changed files with 27 additions and 1 deletions
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28
avr/modules/flash/io_com2w.asm
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@@ -270,7 +270,7 @@ com2wRecvMsg_loop:
rjmp com2wRecvMsg_end rjmp com2wRecvMsg_end
com2wRecvMsg_eBadSize: com2wRecvMsg_eBadSize:
com2wRecvMsg_eIo: com2wRecvMsg_eIo:
com2wRecvMsg_clcRet: rcall com2wRecvByteWaitForQuietClk ; (r18, r20, r22)
clc clc
com2wRecvMsg_end: com2wRecvMsg_end:
ret ret
@@ -278,6 +278,32 @@ com2wRecvMsg_end:
; ---------------------------------------------------------------------------
; @routine com2wRecvByteWaitForQuietClk
;
; Wait until the clock line is consistently high for 1ms.
;
; @clobbers r18, r20, r22
com2wRecvByteWaitForQuietClk:
ldi r18, 200
com2wRecvByteWaitForQuietClk_loop:
ldi r20, 100 ; wait up to 1ms for clock high (R20, R22)
rcall com2wWaitForClockLowMulti10Us
brcs com2wRecvByteWaitForQuietClk_waitForLow
dec r18
brne com2wRecvByteWaitForQuietClk_loop
rjmp com2wRecvByteWaitForQuietClk_ret
com2wRecvByteWaitForQuietClk_waitForLow:
ldi r20, 100 ; wait up to 1ms for clock low (R20, R22)
rcall com2wWaitForClockLowMulti10Us
brcc com2wRecvByteWaitForQuietClk_ret ; not low within 1ms, assume line is quiet
brne com2wRecvByteWaitForQuietClk_loop
com2wRecvByteWaitForQuietClk_ret:
ret
; --------------------------------------------------------------------------- ; ---------------------------------------------------------------------------
; @routine com2wRecvByte ; @routine com2wRecvByte
; ;