From a1972ccce9692f74e1a87129c3140ddf77bbe3dc Mon Sep 17 00:00:00 2001
From: Othmar Gsenger <otti@wirdorange.org>
Date: Sun, 27 Jan 2013 19:32:30 +0000
Subject: improved error handling

git-svn-id: https://svn.spreadspace.org/avr/trunk@71 aa12f405-d877-488e-9caf-2d797e2a1cc7
---
 usb-i2c-sl018/tuer-rfid.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/usb-i2c-sl018/tuer-rfid.c b/usb-i2c-sl018/tuer-rfid.c
index 2954231..f159047 100644
--- a/usb-i2c-sl018/tuer-rfid.c
+++ b/usb-i2c-sl018/tuer-rfid.c
@@ -129,7 +129,11 @@ unsigned char sl018_send_buffer(const unsigned char * buffer)
     if (TWI_StartTransmission(SL018_ADDR | SL018_WRITE,10) == TWI_ERROR_NoError)
     {
         for(pos=0; pos<=len; pos++)
-          TWI_SendByte(buffer[pos]);
+          if( ! TWI_SendByte(buffer[pos]))
+          {
+             TWI_StopTransmission();
+             return 1;
+          }
         // Must stop transmission afterwards to release the bus
         TWI_StopTransmission();
     } else {
@@ -141,7 +145,11 @@ unsigned char sl018_send_buffer(const unsigned char * buffer)
         TWI_ReceiveByte(&len, 0);
         twi_rcv_buff[255]=len;
         for(pos=0; pos<len; pos++)
-          TWI_ReceiveByte(&twi_rcv_buff[pos], (pos == len-1) ? 1:0 );
+          if (! TWI_ReceiveByte(&twi_rcv_buff[pos], (pos == len-1) ? 1:0 ) )
+          {
+             TWI_StopTransmission();
+             return 1;
+          }
         // Must stop transmission afterwards to release the bus
         TWI_StopTransmission();
     } else {
-- 
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