Make software USART used in the XPLAINBridge project directly check and store into...

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

diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
index 5e589f3..18d5c01 100644 (file)
--- a/Projects/XPLAINBridge/Lib/SoftUART.c
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -30,27 +30,16 @@
   this software.
 */
 
   this software.
 */
 

-#include "SoftUART.h"
-
-volatile bool    srx_done;
-volatile uint8_t stx_count;
-static   uint8_t srx_data, srx_mask, srx_tmp, stx_data;
-
-void SoftUART_TxByte(uint8_t Byte)
-{
-       while (stx_count);
+/** \file
+ *
+ *  Software UART for both data transmission and reception. This
+ *  code continuously monitors the ring buffers set up by the main
+ *  project source file and reads/writes data as it becomes available.
+ */

 
 

-       stx_data  = ~Byte;
-       stx_count = 10;
-}
-
-uint8_t SoftUART_RxByte(void)
-{
-       while (!(srx_done));
-       srx_done = false;
+#include "SoftUART.h"

 
 

-       return srx_data;
-}
+static uint8_t TX_BitsRemaining, TX_Data, RX_BitMask, RX_Data;

 
 void SoftUART_Init(void)
 {
 
 void SoftUART_Init(void)
 {


@@ -61,8 +50,7 @@ void SoftUART_Init(void)
        EICRA  = (1 << ISC01);                                  // -ve edge
        EIMSK  = (1 << INT0);                                   // enable INT0 interrupt
 
        EICRA  = (1 << ISC01);                                  // -ve edge
        EIMSK  = (1 << INT0);                                   // enable INT0 interrupt
 

-       stx_count = 0;                                                  // nothing to send
-       srx_done  = false;                                              // nothing received
+       TX_BitsRemaining = 0;                                   // nothing to send

        STXPORT |= (1 << STX);                                  // TX output
        STXDDR  |= (1 << STX);                                  // TX output
        SRXPORT |= (1 << SRX);                                  // pullup on INT0
        STXPORT |= (1 << STX);                                  // TX output
        STXDDR  |= (1 << STX);                                  // TX output
        SRXPORT |= (1 << SRX);                                  // pullup on INT0


@@ -73,8 +61,8 @@ ISR(INT0_vect)
 {
        OCR2A = TCNT2 + (BIT_TIME / 8 * 3 / 2); // scan 1.5 bits after start
 
 {
        OCR2A = TCNT2 + (BIT_TIME / 8 * 3 / 2); // scan 1.5 bits after start
 

-       srx_tmp  = 0;                                                   // clear bit storage
-       srx_mask = 1;                                                   // bit mask
+       RX_Data    = 0;                                                 // clear bit storage
+       RX_BitMask = (1 << 0);                                  // bit mask

 
        TIFR2 = (1 << OCF2A);                                   // clear pending interrupt
 
 
        TIFR2 = (1 << OCF2A);                                   // clear pending interrupt
 


@@ -88,19 +76,19 @@ ISR(INT0_vect)
 /* ISR to manage the reception of bits to the transmitter. */
 ISR(TIMER2_COMPA_vect)
 {
 /* ISR to manage the reception of bits to the transmitter. */
 ISR(TIMER2_COMPA_vect)
 {

-       if (srx_mask)
+       if (RX_BitMask)

        {
                if (SRXPIN & (1 << SRX))
        {
                if (SRXPIN & (1 << SRX))

-                 srx_tmp |= srx_mask;
+                 RX_Data |= RX_BitMask;

 
 

-               srx_mask <<= 1;
+               RX_BitMask <<= 1;

 
                OCR2A += BIT_TIME / 8;                          // next bit slice
        }
        else
        {
 
                OCR2A += BIT_TIME / 8;                          // next bit slice
        }
        else
        {

-               srx_done  = true;                                       // mark rx data valid
-               srx_data  = srx_tmp;                            // store rx data
+               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


@@ -112,20 +100,25 @@ ISR(TIMER2_COMPB_vect)
 {
        OCR2B += BIT_TIME / 8;                                  // next bit slice
 
 {
        OCR2B += BIT_TIME / 8;                                  // next bit slice
 

-       if (stx_count)
+       if (TX_BitsRemaining)

        {
        {

-               if (--stx_count != 9)                           // no start bit
+               if (--TX_BitsRemaining != 9)            // no start bit

                {
                {

-                       if (!(stx_data & 1))                    // test inverted data
-                         TCCR2A = (1 << COM2B1) | (1 << COM2B0);
-                       else
+                       if (TX_Data & (1 << 0))                 // test inverted data

                          TCCR2A = (1 << COM2B1);
                          TCCR2A = (1 << COM2B1);

+                       else
+                         TCCR2A = (1 << COM2B1) | (1 << COM2B0);

 
 

-                       stx_data >>= 1;                                 // shift zero in from left
+                       TX_Data >>= 1;                                  // shift zero in from left

                }
                else
                {
                        TCCR2A = (1 << COM2B1);                 // START bit
                }
        }
                }
                else
                {
                        TCCR2A = (1 << COM2B1);                 // START bit
                }
        }

+       else if (USBtoUART_Buffer.Count)
+       {
+               TX_Data = ~RingBuffer_Remove(&USBtoUART_Buffer);
+               TX_BitsRemaining = 10;
+       }

 } 
 }