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Add parity option in serial_soft.c

daktil_manuform
tmk 2013-02-25 01:02:14 +09:00
parent 504a9f42ff
commit 90e6ff92f4
1 changed files with 32 additions and 7 deletions
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39
protocol/serial_soft.c
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@ -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 */