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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;
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
if (clock_in()) return;
switch (state) {
case START:
// ignore start(0) bit
if (!data_in()) return;
if (!dbit) return;
break;
case BIT0 ... BIT7:
data >>= 1;
if (data_in())
if (dbit)
data |= 0x80;
break;
}