77 lines
2.8 KiB
C
77 lines
2.8 KiB
C
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/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/binary.h"
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#include "py/mphal.h"
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#include "shared-bindings/nativeio/AnalogIn.h"
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#include "asf/sam0/drivers/adc/adc.h"
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void common_hal_nativeio_analogin_construct(nativeio_analogin_obj_t* self,
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const mcu_pin_obj_t *pin) {
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if (!pin->has_adc) {
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// No ADC function on that pin
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin %q does not have ADC capabilities", pin->name));
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}
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self->pin = pin;
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struct adc_config config_adc;
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adc_get_config_defaults(&config_adc);
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config_adc.positive_input = self->pin->adc_input;
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config_adc.resolution = ADC_RESOLUTION_CUSTOM;
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config_adc.accumulate_samples = ADC_ACCUMULATE_SAMPLES_16;
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config_adc.divide_result = ADC_DIVIDE_RESULT_16;
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config_adc.clock_prescaler = ADC_CLOCK_PRESCALER_DIV128;
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adc_init(&self->adc_instance, ADC, &config_adc);
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}
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// TODO(tannewt): Don't turn it all on just for one read. This simplifies
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// handling of reading multiple inputs and surviving sleep though so for now its
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// ok.
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uint16_t common_hal_nativeio_analogin_get_value(nativeio_analogin_obj_t *self) {
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adc_enable(&self->adc_instance);
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adc_start_conversion(&self->adc_instance);
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uint16_t data;
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enum status_code status = adc_read(&self->adc_instance, &data);
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while (status == STATUS_BUSY) {
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status = adc_read(&self->adc_instance, &data);
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}
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if (status == STATUS_ERR_OVERFLOW) {
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// TODO(tannewt): Throw an error.
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}
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adc_disable(&self->adc_instance);
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return data;
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}
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