Fix incorrect macro guard in the UC3 EndpointStream header file.

[pub/USBasp.git] / Projects / XPLAINBridge / Lib / SoftUART.c

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 1da2236..370e806 100644 (file)
--- 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)))