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-rw-r--r--converter/pc98_usb/config.h9
-rw-r--r--converter/pc98_usb/matrix.c6
-rw-r--r--protocol/serial_soft.c42
3 files changed, 46 insertions, 11 deletions
diff --git a/converter/pc98_usb/config.h b/converter/pc98_usb/config.h
index 8bcaa26db9..6f9f8fc3cf 100644
--- a/converter/pc98_usb/config.h
+++ b/converter/pc98_usb/config.h
@@ -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
diff --git a/converter/pc98_usb/matrix.c b/converter/pc98_usb/matrix.c
index b3c11dc210..ef2bc38186 100644
--- a/converter/pc98_usb/matrix.c
+++ b/converter/pc98_usb/matrix.c
@@ -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;
diff --git a/protocol/serial_soft.c b/protocol/serial_soft.c
index e0661c3aa1..47b1e4571d 100644
--- a/protocol/serial_soft.c
+++ b/protocol/serial_soft.c
@@ -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;
}