diff options
Diffstat (limited to 'protocol/serial_soft.c')
| -rw-r--r-- | protocol/serial_soft.c | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c index e0661c3aa1..47b1e4571d 100644 --- a/protocol/serial_soft.c +++ b/protocol/serial_soft.c @@ -48,6 +48,23 @@ POSSIBILITY OF SUCH DAMAGE. #define WAIT_US (1000000/SERIAL_BAUD) +#if 1 +#define WAIT_TICK (1000000/SERIAL_BAUD) +#define WAIT4(tick) _delay_us(tick) +#else +#define WAIT_TICK ((16000000/SERIAL_BAUD)/4 - 5) +static inline void WAIT4(uint8_t tick) +{ + __asm__ __volatile__ ( + "1: dec %0" "\n\t" + "nop" "\n\t" + "brne 1b" + : + : "r" (tick) + ); +} +#endif + void serial_init(void) { SERIAL_RXD_INIT(); @@ -60,6 +77,7 @@ static uint8_t rbuf[RBUF_SIZE]; static uint8_t rbuf_head = 0; static uint8_t rbuf_tail = 0; + uint8_t serial_recv(void) { uint8_t data = 0; @@ -103,6 +121,7 @@ void serial_send(uint8_t data) /* detect edge of start bit */ ISR(SERIAL_RXD_VECT) { +PORTD ^= 1<<7; SERIAL_RXD_INT_ENTER() uint8_t data = 0; @@ -120,11 +139,15 @@ ISR(SERIAL_RXD_VECT) #endif /* to center of start bit */ - _delay_us(WAIT_US/2); + //_delay_us(WAIT_US/2); + WAIT4(WAIT_TICK/2); +PORTD ^= 1<<7; do { /* to center of next bit */ - _delay_us(WAIT_US); + //_delay_us(WAIT_US); + WAIT4(WAIT_TICK); +PORTD ^= 1<<7; if (SERIAL_RXD_READ()) { data |= mask; parity ^= 1; @@ -137,19 +160,22 @@ ISR(SERIAL_RXD_VECT) } while (mask); /* to center of parity bit */ - _delay_us(WAIT_US); - parity ^= SERIAL_RXD_READ(); + //_delay_us(WAIT_US); + WAIT4(WAIT_TICK); + if (SERIAL_RXD_READ()) { parity ^= 1; } +PORTD ^= 1<<7; /* to center of stop bit */ - _delay_us(WAIT_US); - _delay_us(WAIT_US/2); + //_delay_us(WAIT_US); + WAIT4(WAIT_TICK); - parity = 1; uint8_t next = (rbuf_head + 1) % RBUF_SIZE; - if (parity && next != rbuf_tail) { + //if (parity && next != rbuf_tail) { + if (next != rbuf_tail) { rbuf[rbuf_head] = data; rbuf_head = next; } SERIAL_RXD_INT_EXIT(); +PORTD ^= 1<<7; } |