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xt_usb: Read data earlier as possible in ISR

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This commit is contained in:
tmk 2018-03-02 02:31:44 +09:00
parent 2b9d4ace5b
commit ea004061a5
1 changed files with 3 additions and 2 deletions
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5
tmk_core/protocol/xt_interrupt.c
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@ -93,17 +93,18 @@ ISR(XT_INT_VECT)
} state = START; } state = START;
static uint8_t data = 0; static uint8_t data = 0;
uint8_t dbit = data_in();
// This is needed if using PCINT which can be called on both falling and rising edge // This is needed if using PCINT which can be called on both falling and rising edge
if (clock_in()) return; if (clock_in()) return;
switch (state) { switch (state) {
case START: case START:
// ignore start(0) bit // ignore start(0) bit
if (!data_in()) return; if (!dbit) return;
break; break;
case BIT0 ... BIT7: case BIT0 ... BIT7:
data >>= 1; data >>= 1;
if (data_in()) if (dbit)
data |= 0x80; data |= 0x80;
break; break;
} }