From 85787726aedbb4cd763613f6c2eadf66f9110ff4 Mon Sep 17 00:00:00 2001
From: Leo C
Date: Tue, 26 Aug 2014 11:19:21 +0200
Subject: i2c.c

---
 avr/i2c.c | 39 +++++++++++----------------------------
 1 file changed, 11 insertions(+), 28 deletions(-)

(limited to 'avr/i2c.c')

diff --git a/avr/i2c.c b/avr/i2c.c
index 5d414af..dbb5da1 100644
--- a/avr/i2c.c
+++ b/avr/i2c.c
@@ -134,21 +134,11 @@ ISR(TWI_vect)
 		break;
 
 	case TWI_MTX_ADR_ACK:
-		tmp_stat |= ADDR_ACK;
-		
-		if (tmp_idx < xmit.len) {		/* all bytes transmited? */
-			TWDR = xmit.buf[tmp_idx];
-			++tmp_idx;
-			next_twcr = (1<<TWEN)|(1<<TWIE)|(1<<TWINT);
-		} else {
-			tmp_stat |= XMIT_DONE;
-			tmp_stat &= ~BUSY;
-			next_twcr = (1<<TWEN)|(0<<TWIE)|(1<<TWINT)|(1<<TWSTO);
-		}
-		break;
-
 	case TWI_MTX_DATA_ACK:
-		tmp_stat |= DATA_ACK;
+		if ((twsr&0xf8) == TWI_MTX_ADR_ACK)
+			tmp_stat |= ADDR_ACK;
+		else
+			tmp_stat |= DATA_ACK;
 
 		if (tmp_idx < xmit.len) {		/* all bytes transmited? */
 			TWDR = xmit.buf[tmp_idx];
@@ -159,7 +149,6 @@ ISR(TWI_vect)
 			tmp_stat &= ~BUSY;
 			next_twcr = (1<<TWEN)|(0<<TWIE)|(1<<TWINT)|(1<<TWSTO);
 		}
-
 		break;
 
 	case TWI_MTX_DATA_NACK:
@@ -168,25 +157,20 @@ ISR(TWI_vect)
 		next_twcr = (1<<TWEN)|(0<<TWIE)|(1<<TWINT)|(1<<TWSTO);
 		break;
 
-	case TWI_MRX_ADR_ACK:
-		tmp_stat |= ADDR_ACK;
-		n = xmit.len-1;
-		if (tmp_idx < n) {
-			next_twcr = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA);
-		} else {
-			next_twcr = (1<<TWEN)|(1<<TWIE)|(1<<TWINT);
-		}
-		break;
-
 	case TWI_MRX_DATA_ACK:
-		tmp_stat |= DATA_ACK;
 		xmit.buf[tmp_idx] = TWDR;
 		++tmp_idx;
+		/* fall thru */
+	case TWI_MRX_ADR_ACK:
+		if ((twsr&0xf8) == TWI_MRX_ADR_ACK)
+			tmp_stat |= ADDR_ACK;
+		else
+			tmp_stat |= DATA_ACK;
+
 		n = xmit.len-1;
 		if (tmp_idx < n) {
 			next_twcr = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA);
 		} else {
-		
 			next_twcr = (1<<TWEN)|(1<<TWIE)|(1<<TWINT);
 		}
 		break;
@@ -197,7 +181,6 @@ ISR(TWI_vect)
 		xmit.buf[tmp_idx] = TWDR;
 		++tmp_idx;
 		/* fall thru */
-
 	default:
 		tmp_stat &= ~BUSY;
 		next_twcr = (1<<TWEN)|(0<<TWIE)|(1<<TWINT)|(1<<TWSTO);
-- 
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