max/tmk_keyboard
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ibmpc: Read data line earlier in ISR as possible

Browse source
This commit is contained in:
tmk 2020-01-11 16:32:46 +09:00
parent fc4b6cd341
commit 3e2900dcc8
1 changed files with 6 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
tmk_core/protocol/ibmpc.c
View file

@ -172,10 +172,7 @@ ISR(IBMPC_INT_VECT)
static uint8_t data = 0;
static uint8_t parity = 1;
// return unless falling edge
if (clock_in()) {
return;
}
uint8_t dbit = IBMPC_DATA_PIN&(1<<IBMPC_DATA_BIT);
// Reset state when taking more than 1ms
if (last_time && timer_elapsed(last_time) > 10) {
@ -190,9 +187,9 @@ ISR(IBMPC_INT_VECT)
case START:
if (ibmpc_protocol == IBMPC_PROTOCOL_XT) {
// ignore start(0) bit
if (!data_in()) return;
if (!dbit) return;
} else {
if (data_in())
if (dbit)
goto ERROR;
}
case BIT0:
@ -204,7 +201,7 @@ ISR(IBMPC_INT_VECT)
case BIT6:
case BIT7:
data >>= 1;
if (data_in()) {
if (dbit) {
data |= 0x80;
parity++;
}
@ -218,7 +215,7 @@ ISR(IBMPC_INT_VECT)
}
break;
case PARITY:
if (data_in()) {
if (dbit) {
if (!(parity & 0x01))
goto ERROR;
} else {
@ -227,7 +224,7 @@ ISR(IBMPC_INT_VECT)
}
break;
case STOP:
if (!data_in())
if (!dbit)
goto ERROR;
if (!ringbuf_put(&rb, data)) {
ibmpc_error = IBMPC_ERR_FULL;