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| author | Dean Camera <dean@fourwalledcubicle.com> | 2011-03-15 04:02:15 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2011-03-15 04:02:15 +0000 |
| commit | 1a130eed6c990701642afc1a1e9738dfd86b0d4b (patch) | |
| tree | 30a73bb3245f7fe43d590cec4a0f3d8385fd3c61 /Projects/XPLAINBridge | |
| parent | 0111fb515dcda78e01b636555d39e408976888b7 (diff) | |
| download | lufa-1a130eed6c990701642afc1a1e9738dfd86b0d4b.tar.gz lufa-1a130eed6c990701642afc1a1e9738dfd86b0d4b.tar.bz2 lufa-1a130eed6c990701642afc1a1e9738dfd86b0d4b.zip | |
Updated the software USART code in the XPLAIN Bridge application so that the incomming bits are sampled at their mid-point instead of starting point, to give maximum reliability (thanks to Anton).
Diffstat (limited to 'Projects/XPLAINBridge')
| -rw-r--r-- | Projects/XPLAINBridge/Lib/SoftUART.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c index ddd983a91..370e806ac 100644 --- a/Projects/XPLAINBridge/Lib/SoftUART.c +++ b/Projects/XPLAINBridge/Lib/SoftUART.c @@ -81,8 +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))) |