esp-idf/components/driver/test/test_dac.c

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2021-05-23 23:06:17 +00:00
/*
* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
Tests for the dac device driver
*/
#include "esp_system.h"
#include "driver/adc.h"
#include "unity.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_wifi.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "test_utils.h"
#include "driver/i2s.h"
#include "soc/soc_caps.h"
#if SOC_DAC_SUPPORTED
#include "driver/dac.h"
#include "esp_adc_cal.h"
static const char *TAG = "test_dac";
#ifdef CONFIG_IDF_TARGET_ESP32
#define ADC_TEST_WIDTH ADC_WIDTH_BIT_12
#elif defined CONFIG_IDF_TARGET_ESP32S2
#define ADC_TEST_WIDTH ADC_WIDTH_BIT_13 //ESP32S2 only support 13 bit width
#endif
#define ADC_TEST_ATTEN ADC_ATTEN_DB_11
#if CONFIG_IDF_TARGET_ESP32
#define ADC_TEST_CHANNEL_NUM ADC2_CHANNEL_8 // GPIO25
#define DAC_TEST_CHANNEL_NUM DAC_CHANNEL_1 // GPIO25
#elif CONFIG_IDF_TARGET_ESP32S2
#define ADC_TEST_CHANNEL_NUM ADC2_CHANNEL_6 // GPIO17
#define DAC_TEST_CHANNEL_NUM DAC_CHANNEL_1 // GPIO17
#endif
#define DAC_OUT_MAX (200)
#define DAC_OUT_TIMES (10)
#define DAC_OUT_STEP (DAC_OUT_MAX / DAC_OUT_TIMES)
#define DAC_TEST_TIMES (100)
TEST_CASE("DAC output (RTC) check by adc", "[dac]")
{
gpio_num_t adc_gpio_num, dac_gpio_num;
TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
//be sure to do the init before using adc2.
printf("adc2_init...\n");
TEST_ESP_OK( adc2_config_channel_atten( ADC_TEST_CHANNEL_NUM, ADC_TEST_ATTEN ) );
vTaskDelay(2 * portTICK_RATE_MS);
printf("start conversion.\n");
int output_data = 0;
int read_raw = 0, read_old = 0;
for (int i = 0; i < DAC_OUT_TIMES; i++) {
TEST_ESP_OK( dac_output_voltage( DAC_TEST_CHANNEL_NUM, output_data ) );
output_data += DAC_OUT_STEP;
vTaskDelay(2 * portTICK_RATE_MS);
TEST_ESP_OK( adc2_get_raw( ADC_TEST_CHANNEL_NUM, ADC_TEST_WIDTH, &read_raw) );
ESP_LOGI(TAG, "DAC%d - ADC%d", output_data, read_raw);
if (read_old != 0) {
TEST_ASSERT_GREATER_THAN(read_old, read_raw);
}
read_old = read_raw;
}
TEST_ESP_OK( dac_output_disable( DAC_TEST_CHANNEL_NUM ) );
}
TEST_CASE("DAC cw generator output (RTC) check by adc", "[dac]")
{
gpio_num_t adc_gpio_num, dac_gpio_num;
TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
dac_cw_config_t cw = {
.en_ch = DAC_TEST_CHANNEL_NUM,
.scale = DAC_CW_SCALE_2,
.phase = DAC_CW_PHASE_0,
.freq = 1000,
#if CONFIG_IDF_TARGET_ESP32
.offset = 64,
#elif CONFIG_IDF_TARGET_ESP32S2
.offset = 16,
#endif
};
TEST_ESP_OK( dac_cw_generator_config(&cw) );
TEST_ESP_OK( dac_cw_generator_enable() );
TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
//be sure to do the init before using adc2.
printf("adc2_init...\n");
TEST_ESP_OK( adc2_config_channel_atten( ADC_TEST_CHANNEL_NUM, ADC_TEST_ATTEN ) );
vTaskDelay(2 * portTICK_RATE_MS);
printf("start conversion.\n");
int read_raw[3] = {0};
for (int i = 0; i < DAC_TEST_TIMES; i++) {
vTaskDelay(10 * portTICK_RATE_MS);
TEST_ESP_OK( adc2_get_raw( ADC_TEST_CHANNEL_NUM, ADC_TEST_WIDTH, &read_raw[0]) );
ESP_LOGI(TAG, "ADC: %d", read_raw[0]);
/* Should open after dac cali. */
// if (read_raw[0] == read_raw[1]) {
// TEST_ASSERT_NOT_EQUAL(read_raw[1], read_raw[2]);
// }
read_raw[2] = read_raw[1];
read_raw[1] = read_raw[0];
}
TEST_ESP_OK( dac_cw_generator_disable() );
TEST_ESP_OK( dac_output_disable( DAC_TEST_CHANNEL_NUM ) );
}
#if CONFIG_IDF_TARGET_ESP32S2
static int helper_calc_dac_output(int mV)
{
return mV * 0.07722;
}
static bool subtest_adc_dac(int mV_ref, esp_adc_cal_characteristics_t * chars)
{
dac_output_voltage(DAC_TEST_CHANNEL_NUM, helper_calc_dac_output(mV_ref));
vTaskDelay(pdMS_TO_TICKS(80));
int raw;
adc2_get_raw((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_WIDTH_BIT_13, &raw);
uint32_t voltage = esp_adc_cal_raw_to_voltage(raw, chars);
2020-10-19 12:41:54 +00:00
TEST_ASSERT_INT_WITHIN( 200, mV_ref, voltage ); // 200 mV error allowance, because both DAC and ADC have error
return true;
}
TEST_CASE("esp32s2 adc2-dac with adc2 calibration", "[adc-dac]")
{
gpio_num_t adc_gpio_num, dac_gpio_num;
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if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) != ESP_OK) {
TEST_IGNORE_MESSAGE("Warning: This esp32s2 board does not support calibration. This test will be skipped.\n");
}
TEST_ESP_OK( adc2_pad_get_io_num( ADC_TEST_CHANNEL_NUM, &adc_gpio_num ) );
TEST_ESP_OK( dac_pad_get_io_num( DAC_TEST_CHANNEL_NUM, &dac_gpio_num ) );
printf("Please connect ADC2 CH%d-GPIO%d <--> DAC CH%d-GPIO%d.\n", ADC_TEST_CHANNEL_NUM, adc_gpio_num,
DAC_TEST_CHANNEL_NUM + 1, dac_gpio_num );
TEST_ESP_OK( dac_output_enable( DAC_TEST_CHANNEL_NUM ) );
esp_adc_cal_characteristics_t chars;
printf("Test 0dB atten...\n");
adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_0);
esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_0, ADC_WIDTH_BIT_13, 0, &chars);
printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
subtest_adc_dac(750, &chars);
printf("Test 2.5dB atten...\n");
adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_2_5);
esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_2_5, ADC_WIDTH_BIT_13, 0, &chars);
printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
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subtest_adc_dac(1100, &chars);
printf("Test 6dB atten...\n");
adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_6);
esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_6, ADC_WIDTH_BIT_13, 0, &chars);
printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
subtest_adc_dac(800, &chars);
subtest_adc_dac(1250, &chars);
printf("Test 11dB atten...\n");
adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_11);
esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_13, 0, &chars);
printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
subtest_adc_dac(1500, &chars);
subtest_adc_dac(2500, &chars);
}
#endif
#endif // SOC_DAC_SUPPORTED