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286 lines
8.1 KiB
C
286 lines
8.1 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <sys/param.h>
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#include <string.h>
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#include "test_utils.h"
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#if !TEMPORARY_DISABLED_FOR_TARGETS(ESP32, ESP32S2, ESP32S3)
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//API only supported for C3 now.
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#include "driver/adc.h"
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#include "esp_adc_cal.h"
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#include "esp_log.h"
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#define TEST_COUNT 4096
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#define MAX_ARRAY_SIZE 4096
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#define TEST_ATTEN ADC_ATTEN_MAX //Set to ADC_ATTEN_*db to test a single attenuation only
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static int s_adc_count[MAX_ARRAY_SIZE]={};
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static int s_adc_offset = -1;
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static int insert_point(uint32_t value)
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{
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const bool fixed_size = true;
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if (s_adc_offset < 0) {
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if (fixed_size) {
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TEST_ASSERT_GREATER_OR_EQUAL(4096, MAX_ARRAY_SIZE);
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s_adc_offset = 0; //Fixed to 0 because the array can hold all the data in 12 bits
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} else {
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s_adc_offset = MAX((int)value - MAX_ARRAY_SIZE/2, 0);
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}
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}
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if (!fixed_size && (value < s_adc_offset || value >= s_adc_offset + MAX_ARRAY_SIZE)) {
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TEST_ASSERT_GREATER_OR_EQUAL(s_adc_offset, value);
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TEST_ASSERT_LESS_THAN(s_adc_offset + MAX_ARRAY_SIZE, value);
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}
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s_adc_count[value - s_adc_offset] ++;
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return value - s_adc_offset;
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}
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static void reset_array(void)
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{
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memset(s_adc_count, 0, sizeof(s_adc_count));
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s_adc_offset = -1;
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}
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static uint32_t get_average(void)
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{
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uint32_t sum = 0;
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int count = 0;
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for (int i = 0; i < MAX_ARRAY_SIZE; i++) {
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sum += s_adc_count[i] * (s_adc_offset+i);
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count += s_adc_count[i];
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}
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return sum/count;
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}
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static void print_summary(bool figure)
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{
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const int MAX_WIDTH=20;
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int max_count = 0;
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int start = -1;
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int end = -1;
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uint32_t sum = 0;
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int count = 0;
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for (int i = 0; i < MAX_ARRAY_SIZE; i++) {
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if (s_adc_count[i] > max_count) {
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max_count = s_adc_count[i];
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}
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if (s_adc_count[i] > 0 && start < 0) {
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start = i;
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}
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if (s_adc_count[i] > 0) {
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end = i;
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}
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count += s_adc_count[i];
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sum += s_adc_count[i] * (s_adc_offset+i);
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}
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if (figure) {
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for (int i = start; i <= end; i++) {
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printf("%4d ", i+s_adc_offset);
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int count = s_adc_count[i] * MAX_WIDTH / max_count;
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for (int j = 0; j < count; j++) {
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putchar('|');
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}
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printf(" %d\n", s_adc_count[i]);
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}
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}
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float average = (float)sum/count;
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float variation_square = 0;
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for (int i = start; i <= end; i ++) {
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if (s_adc_count[i] == 0) {
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continue;
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}
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float delta = i + s_adc_offset - average;
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variation_square += (delta * delta) * s_adc_count[i];
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}
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printf("%d points.\n", count);
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printf("average: %.1f\n", (float)sum/count);
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printf("std: %.2f\n", sqrt(variation_square/count));
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}
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static void continuous_adc_init(uint16_t adc1_chan_mask, uint16_t adc2_chan_mask, adc_channel_t *channel, uint8_t channel_num, adc_atten_t atten)
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{
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adc_digi_init_config_t adc_dma_config = {
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.max_store_buf_size = TEST_COUNT*2,
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.conv_num_each_intr = 128,
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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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TEST_ESP_OK(adc_digi_initialize(&adc_dma_config));
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adc_digi_pattern_table_t adc_pattern[10] = {0};
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adc_digi_config_t dig_cfg = {
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.conv_limit_en = 0,
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.conv_limit_num = 250,
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.sample_freq_hz = 83333,
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};
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dig_cfg.adc_pattern_len = channel_num;
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for (int i = 0; i < channel_num; i++) {
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uint8_t unit = ((channel[i] >> 3) & 0x1);
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uint8_t ch = channel[i] & 0x7;
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adc_pattern[i].atten = atten;
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adc_pattern[i].channel = ch;
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adc_pattern[i].unit = unit;
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}
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dig_cfg.adc_pattern = adc_pattern;
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TEST_ESP_OK(adc_digi_controller_config(&dig_cfg));
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}
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TEST_CASE("test_adc_dma", "[adc][ignore][manual]")
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{
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uint16_t adc1_chan_mask = BIT(2);
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uint16_t adc2_chan_mask = 0;
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adc_channel_t channel[1] = {ADC1_CHANNEL_2};
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adc_atten_t target_atten = TEST_ATTEN;
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const int output_data_size = sizeof(adc_digi_output_data_t);
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int buffer_size = TEST_COUNT*output_data_size;
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uint8_t* read_buf = malloc(buffer_size);
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TEST_ASSERT_NOT_NULL(read_buf);
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adc_atten_t atten;
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bool print_figure;
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if (target_atten == ADC_ATTEN_MAX) {
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atten = ADC_ATTEN_DB_0;
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target_atten = ADC_ATTEN_DB_11;
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print_figure = false;
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} else {
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atten = target_atten;
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print_figure = true;
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}
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while (1) {
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ESP_LOGI("TEST_ADC", "Test with atten: %d", atten);
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memset(read_buf, 0xce, buffer_size);
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bool do_calibration = false;
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esp_adc_cal_characteristics_t chan1_char = {};
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esp_adc_cal_value_t cal_ret = esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_12Bit, 0, &chan1_char);
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if (cal_ret == ESP_ADC_CAL_VAL_EFUSE_TP) {
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do_calibration = true;
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}
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continuous_adc_init(adc1_chan_mask, adc2_chan_mask, channel, sizeof(channel) / sizeof(adc_channel_t), atten);
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adc_digi_start();
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int remain_count = TEST_COUNT;
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while (remain_count) {
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int already_got = TEST_COUNT - remain_count;
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uint32_t ret_num;
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TEST_ESP_OK(adc_digi_read_bytes(read_buf + already_got*output_data_size,
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remain_count*output_data_size, &ret_num, ADC_MAX_DELAY));
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TEST_ASSERT((ret_num % output_data_size) == 0);
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remain_count -= ret_num / output_data_size;
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}
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adc_digi_output_data_t *p = (void*)read_buf;
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reset_array();
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for (int i = 0; i < TEST_COUNT; i++) {
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insert_point(p[i].type2.data);
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}
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print_summary(print_figure);
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if (do_calibration) {
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uint32_t raw = get_average();
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uint32_t voltage_mv = esp_adc_cal_raw_to_voltage(raw, &chan1_char);
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printf("Voltage = %d mV\n", voltage_mv);
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}
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adc_digi_stop();
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TEST_ESP_OK(adc_digi_deinitialize());
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if (atten == target_atten) {
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break;
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}
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atten++;
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}
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free(read_buf);
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}
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TEST_CASE("test_adc_single", "[adc][ignore][manual]")
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{
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adc_atten_t target_atten = TEST_ATTEN;
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adc_atten_t atten;
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bool print_figure;
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if (target_atten == ADC_ATTEN_MAX) {
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atten = ADC_ATTEN_DB_0;
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target_atten = ADC_ATTEN_DB_11;
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print_figure = false;
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} else {
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atten = target_atten;
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print_figure = true;
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}
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adc1_config_width(ADC_WIDTH_BIT_12);
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while (1) {
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ESP_LOGI("TEST_ADC", "Test with atten: %d", atten);
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adc1_config_channel_atten(ADC1_CHANNEL_2, atten);
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bool do_calibration = false;
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esp_adc_cal_characteristics_t chan1_char = {};
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esp_adc_cal_value_t cal_ret = esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_12Bit, 0, &chan1_char);
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if (cal_ret == ESP_ADC_CAL_VAL_EFUSE_TP) {
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do_calibration = true;
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}
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const int test_count = TEST_COUNT;
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adc1_channel_t channel = ADC1_CHANNEL_2;
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while (1) {
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reset_array();
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for (int i = 0; i < test_count; i++) {
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uint32_t raw = adc1_get_raw(channel);
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insert_point(raw);
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}
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print_summary(print_figure);
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break;
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}
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if (do_calibration) {
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uint32_t raw = get_average();
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uint32_t voltage_mv = esp_adc_cal_raw_to_voltage(raw, &chan1_char);
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printf("Voltage = %d mV\n", voltage_mv);
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}
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if (atten == target_atten) {
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break;
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}
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atten++;
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}
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}
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#endif
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