X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/1d433d4506113c95285f633e3553ff62d4cfd05d..6e7fc21a94f29e09b4bdce7c17cade5b1322bc7d:/Projects/XPLAINBridge/Lib/SoftUART.c

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 1da223676..370e806ac 100644
--- a/Projects/XPLAINBridge/Lib/SoftUART.c
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -51,6 +51,7 @@ static uint8_t RX_BitsRemaining;
 /** Temporary data variable to hold the byte being received as it is shifted in */
 static uint8_t RX_Data;
 
+
 /** Initialises the software UART, ready for data transmission and reception into the global ring buffers. */
 void SoftUART_Init(void)
 {
@@ -80,8 +81,10 @@ ISR(INT0_vect, ISR_BLOCK)
 	/* Reset the number of reception bits remaining counter */
 	RX_BitsRemaining = 8;
 
-	/* Reset the bit reception timer */
-	TCNT1 = 0;
+	/* Reset the bit reception timer to -(1/2) of the total bit time, so that the first data bit is
+	 * sampled mid way through the total bit time, making reception more robust.
+	 */
+	TCNT1 = -(OCR1A >> 1);
 
 	/* Check to see that the pin is still low (prevents glitches from starting a frame reception) */
 	if (!(SRXPIN & (1 << SRX)))