diff options
Diffstat (limited to 'protocol/serial_soft.c')
| -rw-r--r-- | protocol/serial_soft.c | 97 |
1 files changed, 65 insertions, 32 deletions
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c index 3c9c914ed6..e8870bcd79 100644 --- a/protocol/serial_soft.c +++ b/protocol/serial_soft.c @@ -43,12 +43,32 @@ POSSIBILITY OF SUCH DAMAGE. /* * Stupid Inefficient Busy-wait Software Serial - * is still useful for negative logic signal like Sun protocol not supported by hardware USART. + * which is still useful for negative logic signal like Sun protocol + * if it is not supported by hardware UART. + * + * TODO: delay is not accurate enough. Instruction cycle should be counted and inline assemby is needed. */ -#define WAIT_US (1000000/SERIAL_BAUD) +#define WAIT_US (1000000L/SERIAL_SOFT_BAUD) + +#ifdef SERIAL_SOFT_LOGIC_NEGATIVE + #define SERIAL_SOFT_RXD_IN() !(SERIAL_SOFT_RXD_READ()) + #define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_LO() + #define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_HI() +#else + #define SERIAL_SOFT_RXD_IN() !!(SERIAL_SOFT_RXD_READ()) + #define SERIAL_SOFT_TXD_ON() SERIAL_SOFT_TXD_HI() + #define SERIAL_SOFT_TXD_OFF() SERIAL_SOFT_TXD_LO() +#endif + +#ifdef SERIAL_SOFT_PARITY_EVEN + #define SERIAL_SOFT_PARITY_VAL 0 +#elif defined(SERIAL_SOFT_PARITY_ODD) + #define SERIAL_SOFT_PARITY_VAL 1 +#endif /* debug for signal timing, see debug pin with oscilloscope */ +#define SERIAL_SOFT_DEBUG #ifdef SERIAL_SOFT_DEBUG #define SERIAL_SOFT_DEBUG_INIT() (DDRD |= 1<<7) #define SERIAL_SOFT_DEBUG_TGL() (PORTD ^= 1<<7) @@ -62,8 +82,8 @@ void serial_init(void) { SERIAL_SOFT_DEBUG_INIT(); - SERIAL_RXD_INIT(); - SERIAL_TXD_INIT(); + SERIAL_SOFT_RXD_INIT(); + SERIAL_SOFT_TXD_INIT(); } /* RX ring buffer */ @@ -100,85 +120,98 @@ 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 +#ifdef SERIAL_SOFT_BIT_ORDER_MSB uint8_t mask = 0x80; #else uint8_t mask = 0x01; #endif + + uint8_t parity = 0; + + /* start bit */ + SERIAL_SOFT_TXD_OFF(); + _delay_us(WAIT_US); + while (mask) { - if (data&mask) { SERIAL_TXD_ON(); } else { SERIAL_TXD_OFF(); } + if (data&mask) { + SERIAL_SOFT_TXD_ON(); + parity ^= 1; + } else { + SERIAL_SOFT_TXD_OFF(); + } _delay_us(WAIT_US); -#ifdef SERIAL_BIT_ORDER_MSB +#ifdef SERIAL_SOFT_BIT_ORDER_MSB mask >>= 1; #else mask <<= 1; #endif } +#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD) + /* to center of parity bit */ + if (parity != SERIAL_SOFT_PARITY_VAL) { + SERIAL_SOFT_TXD_ON(); + } else { + SERIAL_SOFT_TXD_OFF(); + } + _delay_us(WAIT_US); +#endif + /* stop bit */ - SERIAL_TXD_ON(); + SERIAL_SOFT_TXD_ON(); _delay_us(WAIT_US); } /* detect edge of start bit */ -ISR(SERIAL_RXD_VECT) +ISR(SERIAL_SOFT_RXD_VECT) { - SERIAL_SOFT_DEBUG_TGL() - SERIAL_RXD_INT_ENTER() + SERIAL_SOFT_DEBUG_TGL(); + SERIAL_SOFT_RXD_INT_ENTER() uint8_t data = 0; -#ifdef SERIAL_BIT_ORDER_MSB +#ifdef SERIAL_SOFT_BIT_ORDER_MSB uint8_t mask = 0x80; #else uint8_t mask = 0x01; #endif -#ifdef SERIAL_PARITY_ODD uint8_t parity = 0; -#elif defined(SERIAL_PARITY_EVEN) - uint8_t parity = 1; -#endif /* to center of start bit */ _delay_us(WAIT_US/2); - SERIAL_SOFT_DEBUG_TGL() + SERIAL_SOFT_DEBUG_TGL(); do { /* to center of next bit */ _delay_us(WAIT_US); - SERIAL_SOFT_DEBUG_TGL() - if (SERIAL_RXD_READ()) { + SERIAL_SOFT_DEBUG_TGL(); + if (SERIAL_SOFT_RXD_IN()) { data |= mask; -#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD) parity ^= 1; -#endif } -#ifdef SERIAL_BIT_ORDER_MSB +#ifdef SERIAL_SOFT_BIT_ORDER_MSB mask >>= 1; #else mask <<= 1; #endif } while (mask); -#if defined(SERIAL_PARITY_EVEN) || defined(SERIAL_PARITY_ODD) +#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD) /* to center of parity bit */ _delay_us(WAIT_US); - if (SERIAL_RXD_READ()) { parity ^= 1; } - SERIAL_SOFT_DEBUG_TGL() + if (SERIAL_SOFT_RXD_IN()) { parity ^= 1; } + 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) { +#if defined(SERIAL_SOFT_PARITY_EVEN) || defined(SERIAL_SOFT_PARITY_ODD) + if ((parity == SERIAL_SOFT_PARITY_VAL) && next != rbuf_tail) { #else if (next != rbuf_tail) { #endif @@ -186,6 +219,6 @@ ISR(SERIAL_RXD_VECT) rbuf_head = next; } - SERIAL_RXD_INT_EXIT(); - SERIAL_SOFT_DEBUG_TGL() + SERIAL_SOFT_RXD_INT_EXIT(); + SERIAL_SOFT_DEBUG_TGL(); } |