diff options
Diffstat (limited to 'Projects/AVRISP/Lib/PDITarget.c')
| -rw-r--r-- | Projects/AVRISP/Lib/PDITarget.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c index 03dd77998..7b35a3336 100644 --- a/Projects/AVRISP/Lib/PDITarget.c +++ b/Projects/AVRISP/Lib/PDITarget.c @@ -45,24 +45,42 @@ */
void PDITarget_SendByte(uint8_t Byte)
{
+ uint8_t LogicOneBits = 0;
+
+ // One Start Bit
PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
TOGGLE_PDI_CLOCK;
-
+
+ // Eight Data Bits
for (uint8_t i = 0; i < 8; i++)
{
if (Byte & 0x01)
- PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
+ {
+ PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
+ LogicOneBits++;
+ }
else
- PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
-
+ {
+ PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
+ }
+
Byte >>= 1;
TOGGLE_PDI_CLOCK;
}
- PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
+ // Even Parity Bit
+ if (LogicOneBits & 0x01)
+ PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
+ else
+ PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
+
+ TOGGLE_PDI_CLOCK;
+ // Two Stop Bits
+ PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
+
TOGGLE_PDI_CLOCK;
TOGGLE_PDI_CLOCK;
}
@@ -77,9 +95,11 @@ uint8_t PDITarget_ReceiveByte(void) PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;
+ // One Start Bit
while (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK);
TOGGLE_PDI_CLOCK;
-
+
+ // Eight Data Bits
for (uint8_t i = 0; i < 8; i++)
{
if (PDIDATA_LINE_PIN & PDIDATA_LINE_MASK)
@@ -90,6 +110,10 @@ uint8_t PDITarget_ReceiveByte(void) TOGGLE_PDI_CLOCK;
}
+ // Even Parity Bit (discarded)
+ TOGGLE_PDI_CLOCK;
+
+ // Two Stop Bits
TOGGLE_PDI_CLOCK;
TOGGLE_PDI_CLOCK;
|