Added new SCSI_ASENSE_NOT_READY_TO_READY_CHANGE constant to the Mass Storage class...

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

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 458a505..b96b45f 100644 (file)
--- a/Projects/XPLAINBridge/Lib/SoftUART.c
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -51,7 +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;
 
-/** Initializes the software UART, ready for data transmission and reception into the global ring buffers. */
+/** Initialises 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 */
@@ -63,12 +63,13 @@ void SoftUART_Init(void)
        EICRA  = (1 << ISC01);
        EIMSK  = (1 << INT0);
 
-       /* Set reception timer compare period and enable compare ISR */
-       OCR1A  = BIT_TIME;
+       /* Set the transmission and reception timer compare values for the default baud rate */
+       SoftUART_SetBaud(9600);
+
+       /* Setup reception timer compare ISR */
        TIMSK1 = (1 << OCIE1A);
 
-       /* Set transmission timer compare period, enable compare ISR and start the timer */
-       OCR3A  = BIT_TIME;
+       /* Setup transmission timer compare ISR and start the timer */
        TIMSK3 = (1 << OCIE3A);
        TCCR3B = ((1 << CS30) | (1 << WGM32));
 }
@@ -76,15 +77,21 @@ void SoftUART_Init(void)
 /** ISR to detect the start of a bit being sent to the software UART. */
 ISR(INT0_vect, ISR_BLOCK)
 {
-       /* Reset and start the reception timer */
-       TCNT1  = 0;
-       TCCR1B = ((1 << CS10) | (1 << WGM12));
-
        /* Reset the number of reception bits remaining counter */
        RX_BitsRemaining = 8;
+       
+       /* Reset the bit reception timer */
+       TCNT1 = 0;
 
-       /* Disable start bit detection ISR while the next byte is received */
-       EIMSK = 0;
+       /* Check to see that the pin is still low (prevents glitches from starting a frame reception) */
+       if (!(SRXPIN & (1 << SRX)))
+       {
+               /* Disable start bit detection ISR while the next byte is received */
+               EIMSK = 0;
+
+               /* Start the reception timer */
+               TCCR1B = ((1 << CS10) | (1 << WGM12));
+       }
 }
 
 /** ISR to manage the reception of bits to the software UART. */
@@ -118,7 +125,7 @@ ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 }
 
 /** ISR to manage the transmission of bits via the software UART. */
-ISR(TIMER3_COMPA_vect, ISR_NOBLOCK)
+ISR(TIMER3_COMPA_vect, ISR_BLOCK)
 {
        /* Check if transmission has finished */
        if (TX_BitsRemaining)
@@ -133,7 +140,7 @@ ISR(TIMER3_COMPA_vect, ISR_NOBLOCK)
                TX_Data >>= 1;
                TX_BitsRemaining--;
        }
-       else if (USBtoUART_Buffer.Count)
+       else if (!(RX_BitsRemaining) && !(RingBuffer_IsEmpty(&USBtoUART_Buffer)))
        {
                /* Start bit - TX line low */
                STXPORT &= ~(1 << STX);