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Update wiring_digital.c

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Implemented INPUT_PULLUP digital pin mode.
This commit is contained in:
awenisko 2015-09-03 18:32:28 +02:00
parent 60edebc52b
commit 7533853c57
1 changed files with 10 additions and 3 deletions
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13
digistump-avr/cores/tiny/wiring_digital.c
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@ -35,21 +35,28 @@ void pinMode(uint8_t pin, uint8_t mode)
{ {
uint8_t bit = digitalPinToBitMask(pin); uint8_t bit = digitalPinToBitMask(pin);
uint8_t port = digitalPinToPort(pin); uint8_t port = digitalPinToPort(pin);
volatile uint8_t *reg; volatile uint8_t *reg, *out;
if (port == NOT_A_PIN) return; if (port == NOT_A_PIN) return;
// JWS: can I let the optimizer do this? // JWS: can I let the optimizer do this?
reg = portModeRegister(port); reg = portModeRegister(port);
out = portOutputRegister(port);
if (mode == INPUT) { if (mode == INPUT) {
uint8_t oldSREG = SREG; uint8_t oldSREG = SREG;
cli(); cli();
*reg &= ~bit; *reg &= ~bit;
SREG = oldSREG; SREG = oldSREG;
} else if (mode == INPUT_PULLUP) {
uint8_t oldSREG = SREG;
cli();
*reg &= ~bit;
*out |= bit;
SREG = oldSREG;
} else { } else {
uint8_t oldSREG = SREG; uint8_t oldSREG = SREG;
cli(); cli();
*reg |= bit; *reg |= bit;
SREG = oldSREG; SREG = oldSREG;
} }