90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
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* This file is part of the MicroPython 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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* Copyright (c) 2019 Artur Pacholec
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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 "common-hal/analogio/AnalogIn.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include <string.h>
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#include "py/runtime.h"
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#include "fsl_adc.h"
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#define ADC_CHANNEL_GROUP 0
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void common_hal_analogio_analogin_construct(analogio_analogin_obj_t* self,
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const mcu_pin_obj_t *pin) {
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adc_config_t config = {0};
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if (pin->adc == NULL) {
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mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
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}
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ADC_GetDefaultConfig(&config);
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config.enableLongSample = true;
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config.samplePeriodMode = kADC_SamplePeriod8or24Clocks;
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ADC_Init(pin->adc, &config);
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ADC_SetHardwareAverageConfig(pin->adc, kADC_HardwareAverageCount32);
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ADC_DoAutoCalibration(pin->adc);
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claim_pin(pin);
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self->pin = pin;
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}
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bool common_hal_analogio_analogin_deinited(analogio_analogin_obj_t *self) {
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return self->pin == NULL;
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}
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void common_hal_analogio_analogin_deinit(analogio_analogin_obj_t *self) {
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if (common_hal_analogio_analogin_deinited(self)) {
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return;
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}
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common_hal_reset_pin(self->pin);
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self->pin = NULL;
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}
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uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
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adc_channel_config_t config = { 0 };
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config.channelNumber = self->pin->adc_channel;
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ADC_SetChannelConfig(self->pin->adc, ADC_CHANNEL_GROUP, &config);
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while (!ADC_GetChannelStatusFlags(self->pin->adc, ADC_CHANNEL_GROUP)) {
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}
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// Shift the value to be 16 bit
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return ADC_GetChannelConversionValue(self->pin->adc, ADC_CHANNEL_GROUP) << 4;
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}
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float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
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return 3.3f;
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}
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