circuitpython/ports/atmel-samd/common-hal/analogio/AnalogOut.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 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 <stdint.h>
#include <string.h>
#include "py/mperrno.h"
#include "py/runtime.h"
#include "shared-bindings/analogio/AnalogOut.h"
#include "asf/sam0/drivers/dac/dac.h"
#include "samd21_pins.h"
void common_hal_analogio_analogout_construct(analogio_analogout_obj_t* self,
const mcu_pin_obj_t *pin) {
if (pin->pin != PIN_PA02) {
mp_raise_ValueError("AnalogOut not supported on given pin");
return;
}
struct dac_config config_dac;
dac_get_config_defaults(&config_dac);
config_dac.reference = DAC_REFERENCE_AVCC;
enum status_code status = dac_init(&self->dac_instance, DAC, &config_dac);
if (status != STATUS_OK) {
mp_raise_OSError(MP_EIO);
return;
}
claim_pin(pin);
struct dac_chan_config config_analogout_chan;
dac_chan_get_config_defaults(&config_analogout_chan);
dac_chan_set_config(&self->dac_instance, DAC_CHANNEL_0, &config_analogout_chan);
dac_chan_enable(&self->dac_instance, DAC_CHANNEL_0);
dac_enable(&self->dac_instance);
}
bool common_hal_analogio_analogout_deinited(analogio_analogout_obj_t *self) {
return self->deinited;
}
void common_hal_analogio_analogout_deinit(analogio_analogout_obj_t *self) {
if (common_hal_analogio_analogout_deinited(self)) {
return;
}
dac_disable(&self->dac_instance);
dac_chan_disable(&self->dac_instance, DAC_CHANNEL_0);
reset_pin(PIN_PA02);
self->deinited = true;
}
void common_hal_analogio_analogout_set_value(analogio_analogout_obj_t *self,
uint16_t value) {
// Input is 16 bit but we only support 10 bit so we shift the input.
dac_chan_write(&self->dac_instance, DAC_CHANNEL_0, value >> 6);
}