diff options
| author | Dean Camera <dean@fourwalledcubicle.com> | 2009-12-03 07:42:56 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2009-12-03 07:42:56 +0000 |
| commit | a5adbae652bcf5382ef34d71da4d11de15b482a6 (patch) | |
| tree | 62e488d28a757ce67b514c368a497c1bf1536b08 /Projects/AVRISP/Lib/PDITarget.c | |
| parent | f69f03cb0d02937dee018264f0ac4e9be76fc1f4 (diff) | |
| download | lufa-a5adbae652bcf5382ef34d71da4d11de15b482a6.tar.gz lufa-a5adbae652bcf5382ef34d71da4d11de15b482a6.tar.bz2 lufa-a5adbae652bcf5382ef34d71da4d11de15b482a6.zip | |
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.
Diffstat (limited to 'Projects/AVRISP/Lib/PDITarget.c')
| -rw-r--r-- | Projects/AVRISP/Lib/PDITarget.c | 50 |
1 files changed, 23 insertions, 27 deletions
diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c index 57a1a29ee..d1042068f 100644 --- a/Projects/AVRISP/Lib/PDITarget.c +++ b/Projects/AVRISP/Lib/PDITarget.c @@ -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;
}
|