102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
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/*
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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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*
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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 "py/runtime.h"
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#include "supervisor/shared/translate.h"
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#include "common-hal/microcontroller/Pin.h"
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#include "stm32f4xx_hal.h"
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#include "stm32f4xx_ll_gpio.h"
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#include "stm32f4xx_ll_adc.h"
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//mp_raise_ValueError(translate("U dun goofed"));
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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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//No ADC function on pin
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if (pin->adc == 0xff) {
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mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
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}
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//TODO: add ADC traits to structure?
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//LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA); //required?
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LL_GPIO_SetPinMode(pin_port(pin->number), pin_mask(pin->number), LL_GPIO_MODE_ANALOG);
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1); //TODO: conditional on ADC unit
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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 == mp_const_none;
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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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reset_pin_number(self->pin->number);
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self->pin = mp_const_none;
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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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// Something else might have used the ADC in a different way,
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// so we completely re-initialize it.
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if (LL_ADC_IsEnabled(ADC1) == 0)
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{
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LL_ADC_REG_SetTriggerSource(ADC1, LL_ADC_REG_TRIG_SOFTWARE);
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LL_ADC_REG_SetContinuousMode(ADC1, LL_ADC_REG_CONV_SINGLE);
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LL_ADC_REG_SetSequencerLength(ADC1, LL_ADC_REG_SEQ_SCAN_DISABLE);
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LL_ADC_REG_SetSequencerRanks(ADC1, LL_ADC_REG_RANK_1, LL_ADC_CHANNEL_4);
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LL_ADC_SetChannelSamplingTime(ADC1, LL_ADC_CHANNEL_4, LL_ADC_SAMPLINGTIME_56CYCLES);
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LL_ADC_EnableIT_OVR(ADC1);
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}
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LL_ADC_Enable(ADC1);
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struct adc_sync_descriptor adc;
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samd_peripherals_adc_setup(&adc, self->instance);
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ConversionStartPoll_ADC_GrpRegular();
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/* Retrieve ADC conversion data */
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/* (data scale corresponds to ADC resolution: 12 bits) */
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uhADCxConvertedData = LL_ADC_REG_ReadConversionData12(ADC1);
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// Shift the value to be 16 bit.
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return value << 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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