Remove non-functional maintenance link check.

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

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 00bb383..152c4e1 100644 (file)
--- a/Projects/XPLAINBridge/Lib/SoftUART.c
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -1,15 +1,15 @@
 /*
-                        LUFA Library
-        Copyright (C) Dean Camera, 2010.
+             LUFA Library
+     Copyright (C) Dean Camera, 2012.
 
   dean [at] fourwalledcubicle [dot] com
-         www.fourwalledcubicle.com
+           www.lufa-lib.org
 */
 
 /*
   Copyright 2010  David Prentice (david.prentice [at] farming [dot] uk)
   Copyright 2010  Peter Danneger
-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -51,7 +51,8 @@ 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. */
+
+/** Initializes the software UART, ready for data transmission and reception into the global ring buffers. */
 void SoftUART_Init(void)
 {
        /* Set TX pin to output high, enable RX pull-up */
@@ -67,11 +68,11 @@ void SoftUART_Init(void)
        SoftUART_SetBaud(9600);
 
        /* Setup reception timer compare ISR */
-       TIMSK1 = (1 << ICIE1);
+       TIMSK1 = (1 << OCIE1A);
 
        /* Setup transmission timer compare ISR and start the timer */
-       TIMSK3 = (1 << ICIE3);
-       TCCR3B = ((1 << CS30) | (1 << WGM33) | (1 << WGM32));
+       TIMSK3 = (1 << OCIE3A);
+       TCCR3B = ((1 << CS30) | (1 << WGM32));
 }
 
 /** ISR to detect the start of a bit being sent to the software UART. */
@@ -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)))
@@ -90,12 +93,12 @@ ISR(INT0_vect, ISR_BLOCK)
                EIMSK = 0;
 
                /* Start the reception timer */
-               TCCR1B = ((1 << CS10) | (1 << WGM13) | (1 << WGM12));
+               TCCR1B = ((1 << CS10) | (1 << WGM12));
        }
 }
 
 /** ISR to manage the reception of bits to the software UART. */
-ISR(TIMER1_CAPT_vect, ISR_BLOCK)
+ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 {
        /* Cache the current RX pin value for later checking */
        uint8_t SRX_Cached = (SRXPIN & (1 << SRX));
@@ -120,12 +123,12 @@ ISR(TIMER1_CAPT_vect, ISR_BLOCK)
 
                /* Reception complete, store the received byte if stop bit valid */
                if (SRX_Cached)
-                 RingBuffer_Insert(&XMEGAtoUSB_Buffer, RX_Data);
+                 RingBuffer_Insert(&UARTtoUSB_Buffer, RX_Data);
        }
 }
 
 /** ISR to manage the transmission of bits via the software UART. */
-ISR(TIMER3_CAPT_vect, ISR_BLOCK)
+ISR(TIMER3_COMPA_vect, ISR_BLOCK)
 {
        /* Check if transmission has finished */
        if (TX_BitsRemaining)
@@ -140,13 +143,13 @@ ISR(TIMER3_CAPT_vect, ISR_BLOCK)
                TX_Data >>= 1;
                TX_BitsRemaining--;
        }
-       else if (!(RX_BitsRemaining) && !(RingBuffer_IsEmpty(&USBtoXMEGA_Buffer)))
+       else if (!(RX_BitsRemaining) && !(RingBuffer_IsEmpty(&USBtoUART_Buffer)))
        {
                /* Start bit - TX line low */
                STXPORT &= ~(1 << STX);
 
                /* Transmission complete, get the next byte to send (if available) */
-               TX_Data          = ~RingBuffer_Remove(&USBtoXMEGA_Buffer);
+               TX_Data          = ~RingBuffer_Remove(&USBtoUART_Buffer);
                TX_BitsRemaining = 9;
        }
 }