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Quick Fix: read scan code from PC98

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tmk 2013-02-22 15:48:35 +09:00
parent 6f55cbee1d
commit 11b25580cb
1 changed files with 34 additions and 8 deletions
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42
protocol/serial_soft.c
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@ -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;
}