Add parity option in serial_soft.c
This commit is contained in:
parent
3e6cd81b64
commit
025c2ba312
@ -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 */
|
||||
|
Reference in New Issue
Block a user