diff options
Diffstat (limited to 'wirish/wirish_digital.cpp')
-rw-r--r-- | wirish/wirish_digital.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/wirish/wirish_digital.cpp b/wirish/wirish_digital.cpp new file mode 100644 index 0000000..0c0bd85 --- /dev/null +++ b/wirish/wirish_digital.cpp @@ -0,0 +1,143 @@ +/****************************************************************************** + * The MIT License + * + * Copyright (c) 2010 Perry Hung. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + *****************************************************************************/ + +/* + * Arduino-compatible digital I/O implementation. + */ + +#include "wirish.h" +#include "io.h" + +void pinMode(uint8 pin, WiringPinMode mode) { + gpio_pin_mode outputMode; + boolean pwm = false; + + if (pin >= NR_GPIO_PINS) { + return; + } + + switch(mode) { + case OUTPUT: + outputMode = GPIO_OUTPUT_PP; + break; + case OUTPUT_OPEN_DRAIN: + outputMode = GPIO_OUTPUT_OD; + break; + case INPUT: + case INPUT_FLOATING: + outputMode = GPIO_INPUT_FLOATING; + break; + case INPUT_ANALOG: + outputMode = GPIO_INPUT_ANALOG; + break; + case INPUT_PULLUP: + outputMode = GPIO_INPUT_PU; + break; + case INPUT_PULLDOWN: + outputMode = GPIO_INPUT_PD; + break; + case PWM: + outputMode = GPIO_AF_OUTPUT_PP; + pwm = true; + break; + case PWM_OPEN_DRAIN: + outputMode = GPIO_AF_OUTPUT_OD; + pwm = true; + break; + default: + ASSERT(0); + return; + } + + gpio_set_mode(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin, outputMode); + + if (PIN_MAP[pin].timer_num != TIMER_INVALID) { + /* enable/disable timer channels if we're switching into or + out of pwm */ + if (pwm) { + timer_set_mode(PIN_MAP[pin].timer_num, + PIN_MAP[pin].timer_chan, + TIMER_PWM); + } else { + timer_set_mode(PIN_MAP[pin].timer_num, + PIN_MAP[pin].timer_chan, + TIMER_DISABLED); + } + } +} + + +uint32 digitalRead(uint8 pin) { + if (pin >= NR_GPIO_PINS) { + return 0; + } + + return gpio_read_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin) ? + HIGH : LOW; +} + +void digitalWrite(uint8 pin, uint8 val) { + if (pin >= NR_GPIO_PINS) { + return; + } + + gpio_write_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin, val); +} + +void togglePin(uint8 pin) { + if (pin >= NR_GPIO_PINS) { + return; + } + + gpio_toggle_bit(PIN_MAP[pin].gpio_device, PIN_MAP[pin].pin); +} + +uint8 isButtonPressed() { + if (digitalRead(BOARD_BUTTON_PIN)) { + delay(1); + while (digitalRead(BOARD_BUTTON_PIN)) + ; + return true; + } + return false; +} + +uint8 waitForButtonPress(uint32 timeout) { + uint32 start = millis(); + uint32 time; + if (timeout == 0) { + while (!isButtonPressed()) + ; + return true; + } + do { + time = millis(); + /* properly handle wrap-around */ + if ((start > time && time + (0xffffffffU - start) > timeout) || + time - start > timeout) { + return false; + } + } while (!isButtonPressed()); + return true; +} |