214 lines
6.9 KiB
C
214 lines
6.9 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 Lucian Copeland 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/translate.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#if CPY_STM32L4
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#include "stm32l4xx_hal.h"
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#include "stm32l4xx_ll_gpio.h"
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#include "stm32l4xx_ll_adc.h"
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#include "stm32l4xx_ll_bus.h"
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#define ADC_SAMPLETIME ADC_SAMPLETIME_24CYCLES_5
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#define LL_APB2_GRP1_PERIPH_ADC1 LL_AHB2_GRP1_PERIPH_ADC
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#else
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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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#include "stm32f4xx_ll_bus.h"
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#define ADC_SAMPLETIME ADC_SAMPLETIME_15CYCLES
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#endif
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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_unit == 0x00) {
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raise_ValueError_invalid_pin();
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}
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// TODO: add ADC traits to structure?
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// Note that ADC2 is always bundled pin-to-pin with ADC1 if it exists, and used only
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// for dual conversion. For this basic application it is never used.
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LL_GPIO_SetPinMode(pin_port(pin->port), (uint32_t)pin_mask(pin->number), LL_GPIO_MODE_ANALOG);
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if (pin->adc_unit & 0x01) {
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
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} else if (pin->adc_unit == 0x04) {
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#ifdef LL_APB2_GRP1_PERIPH_ADC3
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC3);
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#endif
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} else {
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mp_raise_RuntimeError(translate("Invalid ADC Unit value"));
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}
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common_hal_mcu_pin_claim(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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reset_pin_number(self->pin->port,self->pin->number);
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self->pin = NULL;
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}
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uint32_t adc_channel(uint32_t channel) {
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#if CPY_STM32L4
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switch (channel) {
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case 0:
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return ADC_CHANNEL_0;
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case 1:
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return ADC_CHANNEL_1;
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case 2:
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return ADC_CHANNEL_2;
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case 3:
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return ADC_CHANNEL_3;
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case 4:
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return ADC_CHANNEL_4;
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case 5:
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return ADC_CHANNEL_5;
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case 6:
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return ADC_CHANNEL_6;
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case 7:
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return ADC_CHANNEL_7;
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case 8:
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return ADC_CHANNEL_8;
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case 9:
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return ADC_CHANNEL_9;
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case 10:
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return ADC_CHANNEL_10;
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case 11:
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return ADC_CHANNEL_11;
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case 12:
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return ADC_CHANNEL_12;
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case 13:
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return ADC_CHANNEL_13;
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case 14:
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return ADC_CHANNEL_14;
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case 15:
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return ADC_CHANNEL_15;
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case 16:
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return ADC_CHANNEL_16;
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case 17:
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return ADC_CHANNEL_17;
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case 18:
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return ADC_CHANNEL_18;
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default:
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return 0;
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}
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#else
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return channel;
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#endif
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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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ADC_TypeDef *ADCx;
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if (self->pin->adc_unit & 0x01) {
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ADCx = ADC1;
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#if CPY_STM32L4
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__HAL_RCC_ADC_CLK_ENABLE();
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#endif
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} else if (self->pin->adc_unit == 0x04) {
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#ifdef ADC3
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ADCx = ADC3;
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#endif
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} else {
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mp_raise_RuntimeError(translate("Invalid ADC Unit value"));
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}
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LL_GPIO_SetPinMode(pin_port(self->pin->port), (uint32_t)pin_mask(self->pin->number), LL_GPIO_MODE_ANALOG);
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// LL_GPIO_PIN_0
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// HAL Implementation
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ADC_HandleTypeDef AdcHandle = {};
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ADC_ChannelConfTypeDef sConfig = {};
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AdcHandle.Instance = ADCx;
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AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
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AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
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AdcHandle.Init.ScanConvMode = DISABLE;
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AdcHandle.Init.ContinuousConvMode = DISABLE;
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AdcHandle.Init.DiscontinuousConvMode = DISABLE;
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AdcHandle.Init.NbrOfDiscConversion = 0;
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AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
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AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
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AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
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AdcHandle.Init.NbrOfConversion = 1;
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AdcHandle.Init.DMAContinuousRequests = DISABLE;
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AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
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#ifdef ADC_OVR_DATA_OVERWRITTEN
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AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; /* DR register is overwritten with the last conversion result in case of overrun */
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#endif
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if (HAL_ADC_Init(&AdcHandle) != HAL_OK) {
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return 0;
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}
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sConfig.Channel = adc_channel(self->pin->adc_channel); // ADC_CHANNEL_0 <-normal iteration, not mask
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sConfig.Rank = 1;
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sConfig.SamplingTime = ADC_SAMPLETIME;
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#if CPY_STM32L4
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sConfig.SingleDiff = ADC_SINGLE_ENDED; /* Single-ended input channel */
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sConfig.OffsetNumber = ADC_OFFSET_NONE; /* No offset subtraction */
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if (!IS_ADC_CHANNEL(&AdcHandle, sConfig.Channel)) {
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return 0;
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}
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#endif
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if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK) {
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return 0;
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}
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#if CPY_STM32L4
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if (HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_SINGLE_ENDED) != HAL_OK) {
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return 0;
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}
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#endif
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if (HAL_ADC_Start(&AdcHandle) != HAL_OK) {
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return 0;
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}
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HAL_ADC_PollForConversion(&AdcHandle,1);
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uint16_t value = (uint16_t)HAL_ADC_GetValue(&AdcHandle);
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HAL_ADC_Stop(&AdcHandle);
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// Stretch 12-bit ADC reading to 16-bit range
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return (value << 4) | (value >> 8);
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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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