diff options
Diffstat (limited to 'cores/arduino')
| -rw-r--r-- | cores/arduino/pins_arduino.h | 46 | ||||
| -rwxr-xr-x | cores/arduino/wiring.h | 148 | ||||
| -rwxr-xr-x | cores/arduino/wiring_digital.c | 76 |
3 files changed, 116 insertions, 154 deletions
diff --git a/cores/arduino/pins_arduino.h b/cores/arduino/pins_arduino.h index 63f4257..4bf6470 100644 --- a/cores/arduino/pins_arduino.h +++ b/cores/arduino/pins_arduino.h @@ -339,6 +339,8 @@ INLINED uint8_t inlined_digitalPinToBitMask(uint8_t pin) } } +// XXX: this needs to return false (or -1) if the pin doesn't have a timer, +// rather than throwing a compilation error. INLINED uint8_t inlined_digitalPinToTimer(uint8_t pin) { switch(pin) { @@ -453,6 +455,8 @@ INLINED uint8_t inlined_digitalPinToBitMask(uint8_t pin) } } +// XXX: this needs to return false (or -1) if the pin doesn't have a timer, +// rather than throwing a compilation error. INLINED uint8_t inlined_digitalPinToTimer(uint8_t pin) { switch(pin) { @@ -477,46 +481,4 @@ INLINED uint8_t inlined_digitalPinToTimer(uint8_t pin) #define analogInPinToBit(P) (P) -INLINED uint8_t digitalPinToPort(uint8_t pin) { - if (__builtin_constant_p(pin)) - return inlined_digitalPinToPort(pin); - else - return pgm_read_byte( digital_pin_to_port_PGM + pin ); -} - -INLINED uint8_t digitalPinToBitMask(uint8_t pin) { - if (__builtin_constant_p(pin)) - return inlined_digitalPinToBitMask(pin); - else - return pgm_read_byte( digital_pin_to_bit_mask_PGM + pin ); -} - -INLINED uint8_t digitalPinToTimer(uint8_t pin) { - if (__builtin_constant_p(pin)) - return inlined_digitalPinToTimer(pin); - else - return pgm_read_byte( digital_pin_to_timer_PGM + pin ); -} - -INLINED volatile uint8_t *portOutputRegister(uint8_t index) { - if (__builtin_constant_p(index)) - return inlined_portOutputRegister(index); - else - return (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + index ) ); -} - -INLINED volatile uint8_t* portInputRegister(uint8_t index) { - if (__builtin_constant_p(index)) - return inlined_portInputRegister(index); - else - return (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + index) ); -} - -INLINED volatile uint8_t* portModeRegister(uint8_t index) { - if (__builtin_constant_p(index)) - return inlined_portModeRegister(index); - else - return (volatile uint8_t *)( pgm_read_word( port_to_mode_PGM + index) ); -} - #endif diff --git a/cores/arduino/wiring.h b/cores/arduino/wiring.h index 433c87e..66ce2f7 100755 --- a/cores/arduino/wiring.h +++ b/cores/arduino/wiring.h @@ -130,68 +130,136 @@ void detachInterrupt(uint8_t); void setup(void); void loop(void); +INLINED uint8_t digitalPinToPort(uint8_t pin) { + if (__builtin_constant_p(pin)) + return inlined_digitalPinToPort(pin); + else + return pgm_read_byte( digital_pin_to_port_PGM + pin ); +} + +INLINED uint8_t digitalPinToBitMask(uint8_t pin) { + if (__builtin_constant_p(pin)) + return inlined_digitalPinToBitMask(pin); + else + return pgm_read_byte( digital_pin_to_bit_mask_PGM + pin ); +} + +INLINED uint8_t digitalPinToTimer(uint8_t pin) { + if (__builtin_constant_p(pin)) + return inlined_digitalPinToTimer(pin); + else + return pgm_read_byte( digital_pin_to_timer_PGM + pin ); +} + +INLINED volatile uint8_t *portOutputRegister(uint8_t index) { + if (__builtin_constant_p(index)) + return inlined_portOutputRegister(index); + else + return (volatile uint8_t *)( pgm_read_word( port_to_output_PGM + index ) ); +} + +INLINED volatile uint8_t* portInputRegister(uint8_t index) { + if (__builtin_constant_p(index)) + return inlined_portInputRegister(index); + else + return (volatile uint8_t *)( pgm_read_word( port_to_input_PGM + index) ); +} + +INLINED volatile uint8_t* portModeRegister(uint8_t index) { + if (__builtin_constant_p(index)) + return inlined_portModeRegister(index); + else + return (volatile uint8_t *)( pgm_read_word( port_to_mode_PGM + index) ); +} + /* * Check if a given pin requires locking. * When accessing lower 32 IO ports we can use SBI/CBI instructions, which are atomic. However * other IO ports require load+modify+store and we need to make them atomic by disabling * interrupts. */ -INLINED int portWriteNeedsLocking(uint8_t pin) +INLINED int registerWriteNeedsLocking(volatile uint8_t *reg) { /* SBI/CBI instructions only work on lower 32 IO ports */ - if (inlined_portOutputRegister(inlined_digitalPinToPort(pin)) > (volatile uint8_t*)&_SFR_IO8(0x1F)) { + if (reg > (volatile uint8_t*)&_SFR_IO8(0x1F)) { return 1; } return 0; } -/* - * These functions will perform OR/AND on a given register, and are atomic. - */ -extern void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit); -extern void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit); - +#define digitalWrite_implementation(pin, value)\ +do {\ + uint8_t oldSREG;\ + uint8_t bit = digitalPinToBitMask(pin);\ + uint8_t port = digitalPinToPort(pin);\ + volatile uint8_t *reg = portOutputRegister(port);\ +\ + if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\ + oldSREG = SREG;\ + cli();\ + }\ +\ + if (value == LOW) {\ + *reg &= ~bit;\ + } else {\ + *reg |= bit;\ + }\ +\ + if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\ + SREG = oldSREG;\ + }\ +} while(0) + INLINED void digitalWrite(uint8_t pin, uint8_t value) { - if (__builtin_constant_p(pin)) { - if (portWriteNeedsLocking(pin)) { - if (value==LOW) { - __digitalWriteAND_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),~inlined_digitalPinToBitMask(pin)); - } else { - __digitalWriteOR_locked(inlined_portOutputRegister(inlined_digitalPinToPort(pin)),inlined_digitalPinToBitMask(pin)); - } - } else { - if (value==LOW) { - *inlined_portOutputRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin)); - } else { - *inlined_portOutputRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin); - } - } - } else { - digitalWrite_lookup(pin,value); - } + if (__builtin_constant_p(pin)) digitalWrite_implementation(pin, value); + else digitalWrite_lookup(pin, value); } -INLINED void pinMode(uint8_t pin, uint8_t mode) +#define pinMode_implementation(pin, value)\ +do {\ + uint8_t bit = digitalPinToBitMask(pin);\ + uint8_t oldSREG;\ + uint8_t port = digitalPinToPort(pin);\ + volatile uint8_t *reg = portModeRegister(port);\ +\ + if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\ + oldSREG = SREG;\ + cli();\ + }\ +\ + if (value == INPUT) { \ + *reg &= ~bit;\ + } else {\ + *reg |= bit;\ + }\ +\ + if (!__builtin_constant_p(pin) || registerWriteNeedsLocking(reg)) {\ + SREG = oldSREG;\ + }\ +} while(0) + +INLINED void pinMode(uint8_t pin, uint8_t value) { - if (__builtin_constant_p(pin)) { - if (mode==INPUT) { - *inlined_portModeRegister(inlined_digitalPinToPort(pin)) &= ~(inlined_digitalPinToBitMask(pin)); - } else { - *inlined_portModeRegister(inlined_digitalPinToPort(pin)) |= inlined_digitalPinToBitMask(pin); - } - } else { - pinMode_lookup(pin,mode); - } + if (__builtin_constant_p(pin)) pinMode_implementation(pin, value); + else pinMode_lookup(pin, value); } +#define digitalRead_implementation(pin)\ +do {\ + uint8_t bit = digitalPinToBitMask(pin);\ + uint8_t port = digitalPinToPort(pin);\ +\ + if (port == NOT_A_PIN) return LOW;\ +\ + if (*portInputRegister(port) & bit) return HIGH;\ + return LOW;\ +} while(0) + INLINED int digitalRead(uint8_t pin) { - if (__builtin_constant_p(pin)) { - return !! *inlined_portInputRegister(inlined_digitalPinToPort(pin)); - } else { - return digitalRead_lookup(pin); - } + if (__builtin_constant_p(pin)) digitalRead_implementation(pin); + else return digitalRead_lookup(pin); } diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c index 95666b1..9671045 100755 --- a/cores/arduino/wiring_digital.c +++ b/cores/arduino/wiring_digital.c @@ -27,28 +27,9 @@ #include "wiring_private.h" #include "pins_arduino.h" -void pinMode_lookup(uint8_t pin, uint8_t mode) +void pinMode_lookup(uint8_t pin, uint8_t val) { - uint8_t bit = digitalPinToBitMask(pin); - uint8_t port = digitalPinToPort(pin); - volatile uint8_t *reg; - - if (port == NOT_A_PIN) return; - - // JWS: can I let the optimizer do this? - reg = portModeRegister(port); - - if (mode == INPUT) { - uint8_t oldSREG = SREG; - cli(); - *reg &= ~bit; - SREG = oldSREG; - } else { - uint8_t oldSREG = SREG; - cli(); - *reg |= bit; - SREG = oldSREG; - } + pinMode_implementation(pin, val); } // Forcing this inline keeps the callers from having to push their own stuff @@ -121,61 +102,12 @@ static void turnOffPWM(uint8_t timer) } } -void __digitalWriteOR_locked(volatile uint8_t*out, uint8_t bit) -{ - uint8_t oldSREG = SREG; - cli(); - *out |= bit; - SREG=oldSREG; -} - -void __digitalWriteAND_locked(volatile uint8_t*out, uint8_t bit) -{ - uint8_t oldSREG = SREG; - cli(); - *out &= bit; // NOTE - no inversion here, invert before calling!!! - SREG=oldSREG; -} - void digitalWrite_lookup(uint8_t pin, uint8_t val) { - uint8_t timer = digitalPinToTimer(pin); - uint8_t bit = digitalPinToBitMask(pin); - uint8_t port = digitalPinToPort(pin); - volatile uint8_t *out; - - if (port == NOT_A_PIN) return; - - // If the pin that support PWM output, we need to turn it off - // before doing a digital write. - if (timer != NOT_ON_TIMER) turnOffPWM(timer); - - out = portOutputRegister(port); - - uint8_t oldSREG = SREG; - cli(); - - if (val == LOW) { - *out &= ~bit; - } else { - *out |= bit; - } - - SREG = oldSREG; + digitalWrite_implementation(pin, val); } int digitalRead_lookup(uint8_t pin) { - uint8_t timer = digitalPinToTimer(pin); - uint8_t bit = digitalPinToBitMask(pin); - uint8_t port = digitalPinToPort(pin); - - if (port == NOT_A_PIN) return LOW; - - // If the pin that support PWM output, we need to turn it off - // before getting a digital reading. - if (timer != NOT_ON_TIMER) turnOffPWM(timer); - - if (*portInputRegister(port) & bit) return HIGH; - return LOW; + digitalRead_implementation(pin); } |