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Increased I2C speed. Added twiSendByteExpectAck.

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This commit is contained in:
Martin Preuss
2023-01-29 15:46:58 +01:00
parent aac3c16b29
commit 2f1a915390
1 changed files with 25 additions and 1 deletions
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26
avr/twimaster.asm
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@@ -2,7 +2,7 @@
; ***************************************************************************
; defines
.equ TWI_BIT_LENGTH = 100000 ; 100000 and 200000 works for display
.equ TWI_BIT_LENGTH = 10000 ; 100000 and 200000 works for display: 10000, 100000, 200000
@@ -285,6 +285,30 @@ twiSendByte_error:
; ---------------------------------------------------------------------------
; twiSendByteExpectAck
;
; Write a byte to the bus and expect ACK response.
;
; IN:
; - R16: byte to send
; OUT:
; - CARRY flag set: okay, cleared on error (including case of non-ACK response)
; USED: R16, R17, R18, R22
twiSendByteExpectAck:
rcall twiSendByte
brcc twiSendByteExpectAck_error
tst r16
brne twiSendByteExpectAck_error
sec
ret
twiSendByteExpectAck_error:
clc
ret
; ---------------------------------------------------------------------------
; twiReceiveByte
;