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-rw-r--r--protocol/serial_soft.c39
1 files changed, 32 insertions, 7 deletions
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c
index 3c9c914ed6..c906c66472 100644
--- a/protocol/serial_soft.c
+++ b/protocol/serial_soft.c
@@ -46,7 +46,7 @@ POSSIBILITY OF SUCH DAMAGE.
* is still useful for negative logic signal like Sun protocol not supported by hardware USART.
*/
-#define WAIT_US (1000000/SERIAL_BAUD)
+#define WAIT_US (1000000L/SERIAL_BAUD)
/* debug for signal timing, see debug pin with oscilloscope */
#ifdef SERIAL_SOFT_DEBUG
@@ -100,18 +100,33 @@ int16_t serial_recv2(void)
void serial_send(uint8_t data)
{
/* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */
- /* start bit */
- SERIAL_TXD_OFF();
- _delay_us(WAIT_US);
#ifdef SERIAL_BIT_ORDER_MSB
uint8_t mask = 0x80;
#else
uint8_t mask = 0x01;
#endif
+
+#ifdef SERIAL_PARITY_ODD
+ uint8_t parity = 1;
+#elif defined(SERIAL_PARITY_EVEN)
+ uint8_t parity = 0;
+#endif
+
+ /* start bit */
+ SERIAL_TXD_OFF();
+ _delay_us(WAIT_US-2);
+
while (mask) {
- if (data&mask) { SERIAL_TXD_ON(); } else { SERIAL_TXD_OFF(); }
- _delay_us(WAIT_US);
+ if (data&mask) {
+ SERIAL_TXD_ON();
+#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
+ parity ^= 1;
+#endif
+ } else {
+ SERIAL_TXD_OFF();
+ }
+ _delay_us(WAIT_US-2);
#ifdef SERIAL_BIT_ORDER_MSB
mask >>= 1;
@@ -120,9 +135,19 @@ void serial_send(uint8_t data)
#endif
}
+#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD)
+ /* to center of parity bit */
+ if (parity) {
+ SERIAL_TXD_ON();
+ } else {
+ SERIAL_TXD_OFF();
+ }
+ _delay_us(WAIT_US-2);
+#endif
+
/* stop bit */
SERIAL_TXD_ON();
- _delay_us(WAIT_US);
+ _delay_us(WAIT_US-2);
}
/* detect edge of start bit */