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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Damien P. George
*
* 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.
*/
#include "py/runtime.h"
#include "lib/pwm.h"
#include "microbit/modmicrobit.h"
uint8_t microbit_pinmode_indices[32] = { 0 };
#define DEBUG 0
const microbit_pinmode_t *microbit_pin_get_mode(const microbit_pin_obj_t *pin) {
uint8_t pinmode = microbit_pinmode_indices[pin->number];
if (pinmode == 0) {
pinmode = pin->initial_mode;
}
#if DEBUG
if (pinmode >= sizeof(microbit_pinmodes)/sizeof(microbit_pinmode_t)) {
mp_hal_display_string("Illegal pinmode");
return µbit_pinmodes[0];
}
#endif
return µbit_pinmodes[pinmode];
}
static void set_mode(uint32_t pin, const microbit_pinmode_t *mode) {
uint32_t index = mode - µbit_pinmodes[0];
microbit_pinmode_indices[pin] = index;
return;
}
void microbit_obj_pin_free(const microbit_pin_obj_t *pin) {
if (pin != NULL) {
set_mode(pin->number, microbit_pin_mode_unused);
}
}
bool microbit_obj_pin_can_be_acquired(const microbit_pin_obj_t *pin) {
const microbit_pinmode_t *current_mode = microbit_pin_get_mode(pin);
return current_mode->release != pinmode_error;
}
bool microbit_obj_pin_acquire(const microbit_pin_obj_t *pin, const microbit_pinmode_t *new_mode) {
const microbit_pinmode_t *current_mode = microbit_pin_get_mode(pin);
// The button mode is effectively a digital-in mode, so allow read_digital to work on a button
if (current_mode == microbit_pin_mode_button && new_mode == microbit_pin_mode_read_digital) {
return false;
}
if (current_mode != new_mode) {
current_mode->release(pin);
set_mode(pin->number, new_mode);
return true;
} else {
return false;
}
}
static void noop(const microbit_pin_obj_t *pin) {
(void)pin;
}
void pinmode_error(const microbit_pin_obj_t *pin) {
const microbit_pinmode_t *current_mode = microbit_pin_get_mode(pin);
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "Pin %d in %q mode", pin->number, current_mode->name));
}
static void analog_release(const microbit_pin_obj_t *pin) {
pwm_release(pin->name);
}
const microbit_pinmode_t microbit_pinmodes[] = {
[MODE_UNUSED] = { MP_QSTR_unused, noop },
[MODE_WRITE_ANALOG] = { MP_QSTR_write_analog, analog_release },
[MODE_READ_DIGITAL] = { MP_QSTR_read_digital, noop },
[MODE_WRITE_DIGITAL] = { MP_QSTR_write_digital, noop },
[MODE_DISPLAY] = { MP_QSTR_display, pinmode_error },
[MODE_BUTTON] = { MP_QSTR_button, pinmode_error },
[MODE_MUSIC] = { MP_QSTR_music, pinmode_error },
[MODE_AUDIO_PLAY] = { MP_QSTR_audio, noop },
[MODE_TOUCH] = { MP_QSTR_touch, noop },
[MODE_I2C] = { MP_QSTR_i2c, pinmode_error },
[MODE_SPI] = { MP_QSTR_spi, pinmode_error }
};
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