@@ -55,7 +55,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
*/ | |||
#define SERIAL_BAUD 19200 | |||
#define SERIAL_PARITY_ODD | |||
#define SERIAL_BIT_ORDER_MSB | |||
#define SERIAL_BIT_ORDER_LSB | |||
#define SERIAL_RXD_DDR DDRD | |||
#define SERIAL_RXD_PORT PORTD | |||
@@ -67,7 +67,9 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
SERIAL_RXD_DDR &= ~(1<<SERIAL_RXD_BIT); \ | |||
SERIAL_RXD_PORT |= (1<<SERIAL_RXD_BIT); \ | |||
/* enable interrupt: INT2(rising edge) */ \ | |||
EICRA |= ((1<<ISC21)|(1<<ISC20)); \ | |||
/*EICRA |= ((1<<ISC21)|(1<<ISC20));*/ \ | |||
/* enable interrupt: INT2(falling edge) */ \ | |||
EICRA |= ((1<<ISC21)|(0<<ISC20)); \ | |||
EIMSK |= (1<<INT2); \ | |||
} while (0) | |||
#define SERIAL_RXD_INT_ENTER() | |||
@@ -75,7 +77,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
/* clear interrupt flag */ \ | |||
EIFR = (1<<INTF2); \ | |||
} while (0) | |||
#define SERIAL_RXD_READ() (~SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT)) | |||
//#define SERIAL_RXD_READ() (~SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT)) | |||
#define SERIAL_RXD_READ() ((SERIAL_RXD_PIN&(1<<SERIAL_RXD_BIT))) | |||
#define SERIAL_TXD_DDR DDRD | |||
#define SERIAL_TXD_PORT PORTD |
@@ -73,6 +73,8 @@ void matrix_init(void) | |||
PC98_RDY_PORT |= (1<<PC98_RDY_BIT); | |||
PC98_RTY_PORT |= (1<<PC98_RTY_BIT); | |||
DDRD |= 1<<7; | |||
serial_init(); | |||
@@ -83,6 +85,9 @@ void matrix_init(void) | |||
_delay_us(13); | |||
PC98_RDY_PORT |= (1<<PC98_RDY_BIT); | |||
// PC98 ready | |||
PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT); | |||
// initialize matrix state: all keys off | |||
for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00; | |||
@@ -96,6 +101,7 @@ uint8_t matrix_scan(void) | |||
uint8_t code; | |||
PC98_RDY_PORT |= (1<<PC98_RDY_BIT); | |||
_delay_us(30); | |||
code = serial_recv(); | |||
PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT); | |||
if (!code) return 0; |
@@ -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; | |||
} |