diff options
| -rwxr-xr-x | cores/arduino/Arduino.h | 1 | ||||
| -rwxr-xr-x | cores/arduino/wiring_digital.c | 10 |
2 files changed, 10 insertions, 1 deletions
diff --git a/cores/arduino/Arduino.h b/cores/arduino/Arduino.h index bfec943..830c995 100755 --- a/cores/arduino/Arduino.h +++ b/cores/arduino/Arduino.h @@ -20,6 +20,7 @@ extern "C"{ #define INPUT 0x0 #define OUTPUT 0x1 +#define INPUT_PULLUP 0x2 #define true 0x1 #define false 0x0 diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c index 97ef134..584a28a 100755 --- a/cores/arduino/wiring_digital.c +++ b/cores/arduino/wiring_digital.c @@ -32,17 +32,25 @@ void pinMode(uint8_t pin, uint8_t mode) { uint8_t bit = digitalPinToBitMask(pin); uint8_t port = digitalPinToPort(pin); - volatile uint8_t *reg; + volatile uint8_t *reg, *out; if (port == NOT_A_PIN) return; // JWS: can I let the optimizer do this? reg = portModeRegister(port); + out = portOutputRegister(port); if (mode == INPUT) { uint8_t oldSREG = SREG; cli(); *reg &= ~bit; + *out &= ~bit; + SREG = oldSREG; + } else if (mode == INPUT_PULLUP) { + uint8_t oldSREG = SREG; + cli(); + *reg &= ~bit; + *out |= bit; SREG = oldSREG; } else { uint8_t oldSREG = SREG; |