diff options
Diffstat (limited to 'Projects/AVRISP')
| -rw-r--r-- | Projects/AVRISP/Lib/PDIProtocol.c | 12 | ||||
| -rw-r--r-- | Projects/AVRISP/Lib/PDITarget.c | 54 | ||||
| -rw-r--r-- | Projects/AVRISP/makefile | 2 |
3 files changed, 50 insertions, 18 deletions
diff --git a/Projects/AVRISP/Lib/PDIProtocol.c b/Projects/AVRISP/Lib/PDIProtocol.c index 28bd54071..32a74c586 100644 --- a/Projects/AVRISP/Lib/PDIProtocol.c +++ b/Projects/AVRISP/Lib/PDIProtocol.c @@ -111,18 +111,20 @@ static void PDIProtocol_EnterXPROGMode(void) /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */
PDITarget_SendByte(PDI_CMD_KEY);
- for (uint8_t i = 0; i < sizeof(PDI_NVMENABLE_KEY); i++)
- PDITarget_SendByte(PDI_NVMENABLE_KEY[i]);
+ for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)
+ PDITarget_SendByte(PDI_NVMENABLE_KEY[i - 1]);
/* Poll the STATUS register to check to see if NVM access has been enabled */
- uint8_t NVMAttemptsRemaining = 200;
- while (NVMAttemptsRemaining--)
+ uint8_t NVMAttemptsRemaining = 150;
+ while (NVMAttemptsRemaining)
{
_delay_ms(1);
- PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);
+ PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);
if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
break;
+
+ NVMAttemptsRemaining--;
}
Endpoint_Write_Byte(CMD_XPROG);
diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c index d012a1beb..22a4d019a 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 */
diff --git a/Projects/AVRISP/makefile b/Projects/AVRISP/makefile index 37c0e722b..003eaa57a 100644 --- a/Projects/AVRISP/makefile +++ b/Projects/AVRISP/makefile @@ -66,7 +66,7 @@ MCU = at90usb1287 # Target board (see library "Board Types" documentation, USER or blank for projects not requiring
# LUFA board drivers). If USER is selected, put custom board drivers in a directory called
# "Board" inside the application directory.
-BOARD = XPLAIN
+BOARD = XPLAIN
# Processor frequency.
|