Rename software USART driver globals to make the code more in line with the rest...

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

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 18d5c01..0591284 100644 (file)
--- a/Projects/XPLAINBridge/Lib/SoftUART.c
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -39,7 +39,8 @@
 
 #include "SoftUART.h"
 
-static uint8_t TX_BitsRemaining, TX_Data, RX_BitMask, RX_Data;
+static uint8_t TX_BitsRemaining, TX_Data;
+static uint8_t RX_BitMask, RX_Data;
 
 void SoftUART_Init(void)
 {
@@ -50,16 +51,15 @@ void SoftUART_Init(void)
        EICRA  = (1 << ISC01);                                  // -ve edge
        EIMSK  = (1 << INT0);                                   // enable INT0 interrupt
 
-       TX_BitsRemaining = 0;                                   // nothing to send
        STXPORT |= (1 << STX);                                  // TX output
        STXDDR  |= (1 << STX);                                  // TX output
        SRXPORT |= (1 << SRX);                                  // pullup on INT0
 }
 
-/* ISR to detect the start of a bit being sent from the transmitter. */
+/* ISR to detect the start of a bit being sent to the software UART. */
 ISR(INT0_vect)
 {
-       OCR2A = TCNT2 + (BIT_TIME / 8 * 3 / 2); // scan 1.5 bits after start
+       OCR2A = TCNT2 + (uint16_t)((BIT_TIME / 8.0f) * 1.5f);   // scan 1.5 bits after start
 
        RX_Data    = 0;                                                 // clear bit storage
        RX_BitMask = (1 << 0);                                  // bit mask
@@ -68,12 +68,12 @@ ISR(INT0_vect)
 
        if (!(SRXPIN & (1 << SRX)))                             // still low
        {
-               TIMSK2 = (1 << OCIE2A) | (1 << OCIE2B); // wait for first bit
+               TIMSK2 =  (1 << OCIE2A) | (1 << OCIE2B); // wait for first bit
                EIMSK &= ~(1 << INT0);
        }
 }
 
-/* ISR to manage the reception of bits to the transmitter. */
+/* ISR to manage the reception of bits to the software UART. */
 ISR(TIMER2_COMPA_vect)
 {
        if (RX_BitMask)
@@ -89,13 +89,13 @@ ISR(TIMER2_COMPA_vect)
        {
                RingBuffer_Insert(&UARTtoUSB_Buffer, RX_Data);
 
-               TIMSK2    = (1 << OCIE2B);                      // enable tx and wait for start
-               EIMSK    |= (1 << INT0);                        // enable START irq
-               EIFR      = (1 << INTF0);                       // clear any pending
+               TIMSK2  = (1 << OCIE2B);                        // enable tx and wait for start
+               EIMSK  |= (1 << INT0);                          // enable START irq
+               EIFR    = (1 << INTF0);                         // clear any pending
        }
 }
 
-/* ISR to manage the transmission of bits to the receiver. */
+/* ISR to manage the transmission of bits via the software UART. */
 ISR(TIMER2_COMPB_vect)
 {
        OCR2B += BIT_TIME / 8;                                  // next bit slice