From 4864d1648256999dc63409c2561c78488a7ca795 Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Mon, 30 Jan 2023 01:02:31 +0100
Subject: [PATCH] twi_master: add routine twiReceiveByteSendAck.

---
 avr/twimaster.asm | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/avr/twimaster.asm b/avr/twimaster.asm
index 5b156a3..31a224d 100644
--- a/avr/twimaster.asm
+++ b/avr/twimaster.asm
@@ -340,6 +340,32 @@ twiReceiveByte_error:
 
 
 
+; ---------------------------------------------------------------------------
+; twiReceiveByteSendAck
+;
+; Read a byte from the bus. Sends ACK bit.
+;
+; IN:
+; OUT:
+; - CARRY flag set: okay, cleared on error
+; - R16: byte received
+; USED: R16, R17, R18, R22
+
+twiReceiveByteSendAck:
+  rcall twiReceiveByte
+  brcc twiReceiveByteSendAck_error
+  push r16
+    clr r16
+    rcall twiWriteBit  ; send ACK (R16, R22)
+  pop r16
+  sec
+  ret
+twiReceiveByteSendAck_error:
+  clc
+  ret
+
+
+
 TWI_Master_ScanNext:
   in r15, SREG
   cli