|
|
@@ -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(); |
|
|
|
} |
|
|
@@ -60,6 +72,7 @@ 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; |
|
|
@@ -72,6 +85,18 @@ uint8_t serial_recv(void) |
|
|
|
return data; |
|
|
|
} |
|
|
|
|
|
|
|
int16_t serial_recv2(void) |
|
|
|
{ |
|
|
|
uint8_t data = 0; |
|
|
|
if (rbuf_head == rbuf_tail) { |
|
|
|
return -1; |
|
|
|
} |
|
|
|
|
|
|
|
data = rbuf[rbuf_tail]; |
|
|
|
rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE; |
|
|
|
return data; |
|
|
|
} |
|
|
|
|
|
|
|
void serial_send(uint8_t data) |
|
|
|
{ |
|
|
|
/* signal state: IDLE: ON, START: OFF, STOP: ON, DATA0: OFF, DATA1: ON */ |
|
|
@@ -103,22 +128,36 @@ void serial_send(uint8_t data) |
|
|
|
/* detect edge of start bit */ |
|
|
|
ISR(SERIAL_RXD_VECT) |
|
|
|
{ |
|
|
|
SERIAL_SOFT_DEBUG_TGL() |
|
|
|
SERIAL_RXD_INT_ENTER() |
|
|
|
|
|
|
|
uint8_t data = 0; |
|
|
|
|
|
|
|
#ifdef SERIAL_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() |
|
|
|
do { |
|
|
|
/* to center of next bit */ |
|
|
|
_delay_us(WAIT_US); |
|
|
|
|
|
|
|
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; |
|
|
@@ -126,14 +165,27 @@ ISR(SERIAL_RXD_VECT) |
|
|
|
mask <<= 1; |
|
|
|
#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; } |
|
|
|
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(); |
|
|
|
SERIAL_SOFT_DEBUG_TGL() |
|
|
|
} |