diff options
Diffstat (limited to 'protocol/serial_soft.c')
| -rw-r--r-- | protocol/serial_soft.c | 39 |
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 */ |