diff options
Diffstat (limited to 'protocol')
| -rw-r--r-- | protocol/serial_soft.c | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c index af5110b4f6..3c9c914ed6 100644 --- a/protocol/serial_soft.c +++ b/protocol/serial_soft.c @@ -48,8 +48,20 @@ POSSIBILITY OF SUCH DAMAGE. #define WAIT_US (1000000/SERIAL_BAUD) +/* debug for signal timing, see debug pin with oscilloscope */ +#ifdef SERIAL_SOFT_DEBUG + #define SERIAL_SOFT_DEBUG_INIT() (DDRD |= 1<<7) + #define SERIAL_SOFT_DEBUG_TGL() (PORTD ^= 1<<7) +#else + #define SERIAL_SOFT_DEBUG_INIT() + #define SERIAL_SOFT_DEBUG_TGL() +#endif + + void serial_init(void) { + SERIAL_SOFT_DEBUG_INIT(); + SERIAL_RXD_INIT(); SERIAL_TXD_INIT(); } @@ -116,7 +128,7 @@ void serial_send(uint8_t data) /* detect edge of start bit */ ISR(SERIAL_RXD_VECT) { -PORTD ^= 1<<7; + SERIAL_SOFT_DEBUG_TGL() SERIAL_RXD_INT_ENTER() uint8_t data = 0; @@ -129,21 +141,23 @@ PORTD ^= 1<<7; #ifdef SERIAL_PARITY_ODD uint8_t parity = 0; -#else +#elif defined(SERIAL_PARITY_EVEN) uint8_t parity = 1; #endif /* to center of start bit */ _delay_us(WAIT_US/2); -PORTD ^= 1<<7; + SERIAL_SOFT_DEBUG_TGL() do { /* to center of next bit */ _delay_us(WAIT_US); -PORTD ^= 1<<7; + SERIAL_SOFT_DEBUG_TGL() if (SERIAL_RXD_READ()) { data |= mask; +#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD) parity ^= 1; +#endif } #ifdef SERIAL_BIT_ORDER_MSB mask >>= 1; @@ -152,20 +166,26 @@ PORTD ^= 1<<7; #endif } while (mask); +#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD) /* to center of parity bit */ _delay_us(WAIT_US); if (SERIAL_RXD_READ()) { parity ^= 1; } -PORTD ^= 1<<7; + SERIAL_SOFT_DEBUG_TGL() +#endif /* to center of stop bit */ _delay_us(WAIT_US); uint8_t next = (rbuf_head + 1) % RBUF_SIZE; +#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD) if (parity && next != rbuf_tail) { +#else + if (next != rbuf_tail) { +#endif rbuf[rbuf_head] = data; rbuf_head = next; } SERIAL_RXD_INT_EXIT(); -PORTD ^= 1<<7; + SERIAL_SOFT_DEBUG_TGL() } |