mirror of
https://github.com/espressif/esp-idf.git
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6a0951ecb2
ESP32 lets the user choose from using Vref, Lookup Table, and Two-Point Calibration. In ESP32S2 only two-point calibration is supported. This commit support these changes in idf. Closes https://github.com/espressif/esp-idf/issues/5455
180 lines
6.4 KiB
C
180 lines
6.4 KiB
C
/*
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Tests for the dac device driver
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*/
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#include "esp_system.h"
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#include "driver/adc.h"
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#include "driver/dac.h"
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#include "unity.h"
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#include "esp_system.h"
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#include "esp_event.h"
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#include "esp_wifi.h"
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#include "esp_log.h"
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#include "nvs_flash.h"
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#include "test_utils.h"
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#include "driver/i2s.h"
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#include "esp_adc_cal.h"
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static const char *TAG = "test_dac";
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#ifdef CONFIG_IDF_TARGET_ESP32
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#define ADC_TEST_WIDTH ADC_WIDTH_BIT_12
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#elif defined CONFIG_IDF_TARGET_ESP32S2
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#define ADC_TEST_WIDTH ADC_WIDTH_BIT_13 //ESP32S2 only support 13 bit width
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#endif
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#define ADC_TEST_ATTEN ADC_ATTEN_DB_11
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#if CONFIG_IDF_TARGET_ESP32
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#define ADC_TEST_CHANNEL_NUM ADC2_CHANNEL_8 // GPIO25
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#define DAC_TEST_CHANNEL_NUM DAC_CHANNEL_1 // GPIO25
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#elif CONFIG_IDF_TARGET_ESP32S2
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#define ADC_TEST_CHANNEL_NUM ADC2_CHANNEL_6 // GPIO17
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#define DAC_TEST_CHANNEL_NUM DAC_CHANNEL_1 // GPIO17
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#endif
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#define DAC_OUT_MAX (200)
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#define DAC_OUT_TIMES (10)
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#define DAC_OUT_STEP (DAC_OUT_MAX / DAC_OUT_TIMES)
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#define DAC_TEST_TIMES (100)
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TEST_CASE("DAC output (RTC) check by adc", "[dac]")
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{
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gpio_num_t adc_gpio_num, dac_gpio_num;
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TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
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TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
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printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
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DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
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TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
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//be sure to do the init before using adc2.
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printf("adc2_init...\n");
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TEST_ESP_OK( adc2_config_channel_atten( ADC_TEST_CHANNEL_NUM, ADC_TEST_ATTEN ) );
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vTaskDelay(2 * portTICK_RATE_MS);
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printf("start conversion.\n");
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int output_data = 0;
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int read_raw = 0, read_old = 0;
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for (int i = 0; i < DAC_OUT_TIMES; i++) {
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TEST_ESP_OK( dac_output_voltage( DAC_TEST_CHANNEL_NUM, output_data ) );
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output_data += DAC_OUT_STEP;
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vTaskDelay(2 * portTICK_RATE_MS);
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TEST_ESP_OK( adc2_get_raw( ADC_TEST_CHANNEL_NUM, ADC_TEST_WIDTH, &read_raw) );
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ESP_LOGI(TAG, "DAC%d - ADC%d", output_data, read_raw);
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if (read_old != 0) {
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TEST_ASSERT_GREATER_THAN(read_old, read_raw);
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}
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read_old = read_raw;
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}
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TEST_ESP_OK( dac_output_disable( DAC_TEST_CHANNEL_NUM ) );
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}
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TEST_CASE("DAC cw generator output (RTC) check by adc", "[dac]")
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{
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gpio_num_t adc_gpio_num, dac_gpio_num;
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TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
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TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
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printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
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DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
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dac_cw_config_t cw = {
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.en_ch = DAC_TEST_CHANNEL_NUM,
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.scale = DAC_CW_SCALE_2,
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.phase = DAC_CW_PHASE_0,
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.freq = 1000,
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#if CONFIG_IDF_TARGET_ESP32
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.offset = 64,
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#elif CONFIG_IDF_TARGET_ESP32S2
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.offset = 16,
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#endif
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};
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TEST_ESP_OK( dac_cw_generator_config(&cw) );
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TEST_ESP_OK( dac_cw_generator_enable() );
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TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
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//be sure to do the init before using adc2.
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printf("adc2_init...\n");
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TEST_ESP_OK( adc2_config_channel_atten( ADC_TEST_CHANNEL_NUM, ADC_TEST_ATTEN ) );
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vTaskDelay(2 * portTICK_RATE_MS);
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printf("start conversion.\n");
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int read_raw[3] = {0};
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for (int i = 0; i < DAC_TEST_TIMES; i++) {
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vTaskDelay(10 * portTICK_RATE_MS);
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TEST_ESP_OK( adc2_get_raw( ADC_TEST_CHANNEL_NUM, ADC_TEST_WIDTH, &read_raw[0]) );
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ESP_LOGI(TAG, "ADC: %d", read_raw[0]);
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/* Should open after dac cali. */
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// if (read_raw[0] == read_raw[1]) {
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// TEST_ASSERT_NOT_EQUAL(read_raw[1], read_raw[2]);
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// }
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read_raw[2] = read_raw[1];
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read_raw[1] = read_raw[0];
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}
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TEST_ESP_OK( dac_cw_generator_disable() );
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TEST_ESP_OK( dac_output_disable( DAC_TEST_CHANNEL_NUM ) );
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}
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#if CONFIG_IDF_TARGET_ESP32S2
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static int helper_calc_dac_output(int mV)
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{
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return mV * 0.07722;
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}
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static bool subtest_adc_dac(int mV_ref, esp_adc_cal_characteristics_t * chars)
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{
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dac_output_voltage(DAC_TEST_CHANNEL_NUM, helper_calc_dac_output(mV_ref));
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vTaskDelay(pdMS_TO_TICKS(80));
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int raw;
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adc2_get_raw((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_WIDTH_BIT_13, &raw);
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uint32_t voltage = esp_adc_cal_raw_to_voltage(raw, chars);
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TEST_ASSERT_INT_WITHIN( 120, mV_ref, voltage ); // 120 mV error allowance, because both DAC and ADC have error
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return true;
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}
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TEST_CASE("esp32s2 adc2-dac with adc2 calibration", "[adc-dac]")
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{
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gpio_num_t adc_gpio_num, dac_gpio_num;
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TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
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TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
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printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
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DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
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TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
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esp_adc_cal_characteristics_t chars;
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printf("Test 0dB atten...\n");
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adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_0);
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esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_0, ADC_WIDTH_BIT_13, 0, &chars);
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printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
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subtest_adc_dac(750, &chars);
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printf("Test 2.5dB atten...\n");
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adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_2_5);
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esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_2_5, ADC_WIDTH_BIT_13, 0, &chars);
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printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
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subtest_adc_dac(1100, &chars);
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printf("Test 6dB atten...\n");
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adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_6);
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esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_6, ADC_WIDTH_BIT_13, 0, &chars);
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printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
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subtest_adc_dac(800, &chars);
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subtest_adc_dac(1250, &chars);
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printf("Test 11dB atten...\n");
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adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_11);
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esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_13, 0, &chars);
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printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
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subtest_adc_dac(1500, &chars);
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subtest_adc_dac(2500, &chars);
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}
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#endif
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