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Diffstat (limited to 'Projects/AVRISP/Lib/PDITarget.c')
-rw-r--r--Projects/AVRISP/Lib/PDITarget.c54
1 files changed, 42 insertions, 12 deletions
diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c
index d012a1beb2..22a4d019a4 100644
--- a/Projects/AVRISP/Lib/PDITarget.c
+++ b/Projects/AVRISP/Lib/PDITarget.c
@@ -38,8 +38,9 @@
#define INCLUDE_FROM_PDITARGET_C
#include "PDITarget.h"
-#if !defined(PDI_VIA_HARDWARE_USART)
volatile bool IsSending;
+
+#if !defined(PDI_VIA_HARDWARE_USART)
volatile uint16_t DataBits;
volatile uint8_t BitCount;
@@ -192,31 +193,60 @@ void PDITarget_DisableTargetPDI(void)
void PDITarget_SendByte(uint8_t Byte)
{
- UCSR1B &= ~(1 << RXEN1);
- UCSR1B |= (1 << TXEN1);
+ /* Switch to Tx mode if currently in Rx mode */
+ if (!(IsSending))
+ {
+ PORTD |= (1 << 3);
+ DDRD |= (1 << 3);
+ UCSR1B &= ~(1 << RXEN1);
+ UCSR1B |= (1 << TXEN1);
+
+ IsSending = true;
+ }
+
+ /* Wait until there is space in the hardware Tx buffer before writing */
+ while (!(UCSR1A & (1 << UDRE1)));
UDR1 = Byte;
-
- while (!(UCSR1A & (1 << TXC1)));
- UCSR1A |= (1 << TXC1);
}
uint8_t PDITarget_ReceiveByte(void)
{
- UCSR1B &= ~(1 << TXEN1);
- UCSR1B |= (1 << RXEN1);
+ /* Switch to Rx mode if currently in Tx mode */
+ if (IsSending)
+ {
+ while (!(UCSR1A & (1 << TXC1)));
+ UCSR1A |= (1 << TXC1);
+ UCSR1B &= ~(1 << TXEN1);
+ UCSR1B |= (1 << RXEN1);
+
+ DDRD &= ~(1 << 3);
+ PORTD &= ~(1 << 3);
+
+ IsSending = false;
+ }
+
+ /* Wait until a byte has been received before reading */
while (!(UCSR1A & (1 << RXC1)));
- UCSR1A |= (1 << RXC1);
-
return UDR1;
}
void PDITarget_SendBreak(void)
{
- UCSR1B &= ~(1 << RXEN1);
- UCSR1B |= (1 << TXEN1);
+ /* Switch to Tx mode if currently in Rx mode */
+ if (!(IsSending))
+ {
+ PORTD |= (1 << 3);
+ DDRD |= (1 << 3);
+
+ UCSR1B &= ~(1 << RXEN1);
+ UCSR1B |= (1 << TXEN1);
+
+ IsSending = true;
+ }
+ /* Need to do nothing for a full frame to send a BREAK */
for (uint8_t i = 0; i <= BITS_IN_FRAME; i++)
{
/* Wait for rising edge of clock */