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Document the PDI programming routines implemented so far in the AVRISP project. Add ability to selectively disable ISP programming support in addition to the existing ability to disable PDI programming support.

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This commit is contained in:
Dean Camera 2009-12-03 07:42:56 +00:00
parent f69f03cb0d
commit a5adbae652
11 changed files with 88 additions and 62 deletions
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50
Projects/AVRISP/Lib/PDITarget.c
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@ -38,12 +38,16 @@
#define INCLUDE_FROM_PDITARGET_C
#include "PDITarget.h"
/** Writes a given byte to the attached XMEGA device, using a RS232 frame via software through the
* PDI interface.
*
* \param Byte Byte to send to the attached device
*/
void PDITarget_SendByte(uint8_t Byte)
{
PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
TOGGLE_PDI_CLOCK;
for (uint8_t i = 0; i < 8; i++)
{
@ -54,33 +58,28 @@ void PDITarget_SendByte(uint8_t Byte)
Byte >>= 1;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
TOGGLE_PDI_CLOCK;
}
PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
TOGGLE_PDI_CLOCK;
TOGGLE_PDI_CLOCK;
}
/** Reads a given byte from the attached XMEGA device, encoded in a RS232 frame through the PDI interface.
*
* \return Received byte from the attached device
*/
uint8_t PDITarget_ReceiveByte(void)
{
uint8_t ReceivedByte = 0;
PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;
PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;
bool FoundStartBit;
do
{
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
FoundStartBit = !(PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);
} while (!FoundStartBit);
while (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);
TOGGLE_PDI_CLOCK;
for (uint8_t i = 0; i < 8; i++)
{
if (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK)
@ -88,16 +87,13 @@ uint8_t PDITarget_ReceiveByte(void)
ReceivedByte <<= 1;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
TOGGLE_PDI_CLOCK;
}
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
PDICLOCK_LINE_PORT ^= PDICLOCK_LINE_MASK;
TOGGLE_PDI_CLOCK;
TOGGLE_PDI_CLOCK;
PDIDATA_LINE_DDR |= PDIDATA_LINE_MASK;
PDIDATA_LINE_DDR |= PDIDATA_LINE_MASK;
return ReceivedByte;
}