315 lines
12 KiB
C
315 lines
12 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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* SPDX-FileCopyrightText: Copyright (c) 2023 Milind Movasha
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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 <stdio.h>
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#include "common-hal/analogbufio/BufferedIn.h"
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#include "shared-bindings/analogbufio/BufferedIn.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared/runtime/interrupt_char.h"
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#include "py/runtime.h"
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#include <string.h>
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#include <stdio.h>
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "driver/adc.h"
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// #define DEBUG_ANALOGBUFIO
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#define NUM_SAMPLES_PER_INTERRUPT 256
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#define NUM_ADC_CHANNELS 1
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#define DMA_BUFFER_SIZE 1024
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#define ATTENUATION ADC_ATTEN_DB_11
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#define ADC_READ_TIMEOUT_MS 2000
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#define ADC_PIN_MAX_VALUE 0xfff
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#if defined(CONFIG_IDF_TARGET_ESP32)
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#define ADC_RESULT_BYTE 2
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#define ADC_CONV_LIMIT_EN 1 // For ESP32, this should always be set to 1
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#elif defined(CONFIG_IDF_TARGET_ESP32S2)
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#define ADC_RESULT_BYTE 2
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#define ADC_CONV_LIMIT_EN 0
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#elif defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32H2)
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#define ADC_RESULT_BYTE 4
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#define ADC_CONV_LIMIT_EN 0
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#elif defined(CONFIG_IDF_TARGET_ESP32S3)
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#define ADC_RESULT_BYTE 4
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#define ADC_CONV_LIMIT_EN 0
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#endif
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static void start_dma(analogbufio_bufferedin_obj_t *self, adc_digi_convert_mode_t *convert_mode, adc_digi_output_format_t *output_format);
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static void stop_dma(analogbufio_bufferedin_obj_t *self);
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void common_hal_analogbufio_bufferedin_construct(analogbufio_bufferedin_obj_t *self, const mcu_pin_obj_t *pin, uint32_t sample_rate) {
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self->pin = pin;
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self->sample_rate = sample_rate;
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}
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static void start_dma(analogbufio_bufferedin_obj_t *self, adc_digi_convert_mode_t *convert_mode, adc_digi_output_format_t *output_format) {
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uint16_t adc1_chan_mask = 0;
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uint16_t adc2_chan_mask = 0;
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const mcu_pin_obj_t *pin = self->pin;
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uint32_t sample_rate = self->sample_rate;
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*output_format = ADC_DIGI_OUTPUT_FORMAT_TYPE1;
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if (pin->adc_index == ADC_UNIT_1) {
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*convert_mode = ADC_CONV_SINGLE_UNIT_1;
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} else {
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*convert_mode = ADC_CONV_SINGLE_UNIT_2;
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}
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if (pin->adc_index == NO_ADC || pin->adc_channel == NO_ADC_CHANNEL) {
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raise_ValueError_invalid_pin();
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}
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/*
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* Chip version Conversion Mode Output Format Type
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* ESP32 1 TYPE1
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* ESP32S2 1,2,BOTH,ALTER TYPE1, TYPE2
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* ESP32C3 ALTER TYPE2
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* ESP32S3 1,2,BOTH,ALTER TYPE2
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* ESP32H3 1,2,BOTH,ALTER TYPE2
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*/
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#if defined(CONFIG_IDF_TARGET_ESP32)
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if (pin->adc_index != ADC_UNIT_1) {
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/*
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* ESP32 only supports ADC1 unit
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* https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
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* Table 29-3
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*/
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raise_ValueError_invalid_pin();
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}
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#endif
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#if defined(CONFIG_IDF_TARGET_ESP32C3)
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/* ESP32C3 only supports alter mode */
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*convert_mode = ADC_CONV_ALTER_UNIT;
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#endif
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#if defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S3) || defined(CONFIG_IDF_TARGET_ESP32H2)
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*output_format = ADC_DIGI_OUTPUT_FORMAT_TYPE2;
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#endif
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common_hal_mcu_pin_claim(pin);
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if (pin->adc_index == ADC_UNIT_1) {
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adc1_chan_mask = 1 << pin->adc_channel;
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} else {
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adc2_chan_mask = 1 << pin->adc_channel;
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}
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adc_digi_init_config_t adc_dma_config = {
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.max_store_buf_size = DMA_BUFFER_SIZE,
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.conv_num_each_intr = NUM_SAMPLES_PER_INTERRUPT,
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.adc1_chan_mask = adc1_chan_mask,
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.adc2_chan_mask = adc2_chan_mask,
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};
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"pin:%d, ADC channel:%d, ADC index:%d, adc1_chan_mask:0x%x, adc2_chan_mask:0x%x\n",pin->number,pin->adc_channel,pin->adc_index,adc1_chan_mask,adc2_chan_mask);
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#endif // DEBUG_ANALOGBUFIO
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esp_err_t err = adc_digi_initialize(&adc_dma_config);
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if (ESP_OK != err) {
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stop_dma(self);
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common_hal_analogbufio_bufferedin_deinit(self);
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mp_raise_ValueError_varg(translate("Unable to initialize ADC DMA controller, ErrorCode:%d"),err);
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}
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adc_digi_configuration_t dig_cfg = {
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.conv_limit_en = ADC_CONV_LIMIT_EN,
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.conv_limit_num = 250,
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.pattern_num = NUM_ADC_CHANNELS,
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.sample_freq_hz = sample_rate,
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.conv_mode = *convert_mode,
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.format = *output_format,
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};
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"conversion_mode:%d, format:%d, conv_limit_en:%d, sample_rate:%d\n",*convert_mode,*output_format,ADC_CONV_LIMIT_EN,sample_rate);
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#endif // DEBUG_ANALOGBUFIO
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adc_digi_pattern_config_t adc_pattern[NUM_ADC_CHANNELS] = {0};
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adc_pattern[0].atten = ATTENUATION;
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adc_pattern[0].channel = pin->adc_channel;
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if (pin->adc_index == ADC_UNIT_1) {
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adc_pattern[0].unit = 0;
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} else {
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adc_pattern[0].unit = 1;
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}
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adc_pattern[0].bit_width = SOC_ADC_DIGI_MAX_BITWIDTH;
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dig_cfg.adc_pattern = adc_pattern;
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"adc_pattern[0].channel:%d, adc_pattern[0].unit:%d, adc_pattern[0].atten:%d\n",adc_pattern[0].channel,adc_pattern[0].unit,adc_pattern[0].atten);
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#endif // DEBUG_ANALOGBUFIO
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err = adc_digi_controller_configure(&dig_cfg);
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if (ESP_OK != err) {
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stop_dma(self);
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common_hal_analogbufio_bufferedin_deinit(self);
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mp_raise_ValueError_varg(translate("Unable to configure ADC DMA controller, ErrorCode:%d"),err);
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}
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err = adc_digi_start();
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if (ESP_OK != err) {
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stop_dma(self);
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common_hal_analogbufio_bufferedin_deinit(self);
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mp_raise_ValueError_varg(translate("Unable to start ADC DMA controller, ErrorCode:%d"),err);
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}
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}
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static void stop_dma(analogbufio_bufferedin_obj_t *self) {
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adc_digi_stop();
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adc_digi_deinitialize();
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// Release ADC Pin
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reset_pin_number(self->pin->number);
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}
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bool common_hal_analogbufio_bufferedin_deinited(analogbufio_bufferedin_obj_t *self) {
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return self->pin == NULL;
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}
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void common_hal_analogbufio_bufferedin_deinit(analogbufio_bufferedin_obj_t *self) {
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if (common_hal_analogbufio_bufferedin_deinited(self)) {
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return;
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}
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self->pin = NULL;
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}
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static bool check_valid_data(const adc_digi_output_data_t *data, const mcu_pin_obj_t *pin, adc_digi_convert_mode_t convert_mode, adc_digi_output_format_t output_format) {
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unsigned int unit = data->type2.unit;
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if (output_format == ADC_DIGI_OUTPUT_FORMAT_TYPE2) {
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if (data->type2.channel >= SOC_ADC_CHANNEL_NUM(unit)) {
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return false;
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}
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if (pin->adc_channel != data->type2.channel) {
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return false;
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}
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} else {
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if (convert_mode == ADC_CONV_SINGLE_UNIT_1) {
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unit = 0;
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} else {
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unit = 1;
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}
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#if defined(CONFIG_IDF_TARGET_ESP32) || defined(CONFIG_IDF_TARGET_ESP32S2)
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if (data->type1.channel >= SOC_ADC_CHANNEL_NUM(unit)) {
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return false;
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}
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if (pin->adc_channel != data->type1.channel) {
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return false;
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}
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#endif
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}
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if (unit > 2) {
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return false;
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}
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return true;
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}
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uint32_t common_hal_analogbufio_bufferedin_readinto(analogbufio_bufferedin_obj_t *self, uint8_t *buffer, uint32_t len, uint8_t bytes_per_sample) {
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uint8_t result[NUM_SAMPLES_PER_INTERRUPT] __attribute__ ((aligned(4))) = {0};
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uint32_t captured_samples = 0;
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uint32_t captured_bytes = 0;
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esp_err_t ret;
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uint32_t ret_num = 0;
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uint32_t adc_reading = 0;
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adc_digi_convert_mode_t convert_mode = ADC_CONV_SINGLE_UNIT_2;
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adc_digi_output_format_t output_format = ADC_DIGI_OUTPUT_FORMAT_TYPE1;
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if (bytes_per_sample != 2) {
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mp_raise_ValueError_varg(translate("%q must be array of type 'H'"), MP_QSTR_buffer);
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}
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start_dma(self, &convert_mode, &output_format);
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"Required bytes: %d\n",len);
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#endif // DEBUG_ANALOGBUFIO
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while (captured_bytes < len) {
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ret_num = 0;
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ret = adc_digi_read_bytes(result, NUM_SAMPLES_PER_INTERRUPT, &ret_num, ADC_READ_TIMEOUT_MS);
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if (ret == ESP_OK) {
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for (uint32_t i = 0; i < ret_num; i += ADC_RESULT_BYTE) {
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adc_digi_output_data_t *pResult = (adc_digi_output_data_t *)(void *)&result[i];
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if (check_valid_data(pResult, self->pin, convert_mode, output_format)) {
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if (captured_bytes < len) {
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uint16_t *pBuffer = (uint16_t *)(void *)&buffer[captured_bytes];
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if (output_format == ADC_DIGI_OUTPUT_FORMAT_TYPE1) {
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#if defined(CONFIG_IDF_TARGET_ESP32) || defined(CONFIG_IDF_TARGET_ESP32S2)
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adc_reading = pResult->type1.data;
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#endif
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} else {
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adc_reading = pResult->type2.data;
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}
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adc_reading = adc_reading * ((1 << 16) - 1) / ADC_PIN_MAX_VALUE;
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*pBuffer = (uint16_t)adc_reading;
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captured_bytes += sizeof(uint16_t);
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captured_samples++;
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} else {
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stop_dma(self);
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return captured_samples;
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}
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} else {
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#if !defined(CONFIG_IDF_TARGET_ESP32C3)
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// For all chips except for ESP32C3 we would receive samples only from one unit
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// For ESP32C3 we may receive sample from alternating units and need to ignore them
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"Invalid sample received: 0x%x\n",pResult->val);
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#endif // DEBUG_ANALOGBUFIO
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stop_dma(self);
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return captured_samples;
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#endif
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}
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}
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} else if (ret == ESP_ERR_TIMEOUT) {
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"ADC Timeout\n");
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#endif // DEBUG_ANALOGBUFIO
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stop_dma(self);
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return captured_samples;
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} else {
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"adc_digi_read_bytes failed error code:%d\n",ret);
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#endif // DEBUG_ANALOGBUFIO
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stop_dma(self);
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return captured_samples;
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}
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}
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stop_dma(self);
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#if defined(DEBUG_ANALOGBUFIO)
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mp_printf(&mp_plat_print,"Captured bytes: %d\n",captured_bytes);
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#endif // DEBUG_ANALOGBUFIO
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return captured_samples;
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}
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