esp-idf/components/driver/test/adc_dma_test/test_esp32.c

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// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
Tests for the adc device driver on ESP32 only
*/
#include "sdkconfig.h"
#if CONFIG_IDF_TARGET_ESP32
#include "esp_system.h"
#include "driver/adc.h"
#include "driver/rtc_io.h"
#include "driver/gpio.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 "esp_rom_sys.h"
#include "driver/dac.h"
/*
* ADC DMA testcase
*/
#include "driver/i2s.h"
#include "test/test_common_adc.h"
//i2s number
#define EXAMPLE_I2S_NUM (0)
//i2s sample rate
#define EXAMPLE_I2S_SAMPLE_RATE (150000)
//i2s data bits
#define EXAMPLE_I2S_SAMPLE_BITS (16)
//enable display buffer for debug
#define EXAMPLE_I2S_BUF_DEBUG (0)
//I2S read buffer length
#define EXAMPLE_I2S_READ_LEN (16 * 1024)
//I2S data format, ADC-I2S only support mono.
#define EXAMPLE_I2S_FORMAT I2S_CHANNEL_FMT_ONLY_RIGHT
//I2S built-in ADC unit
#define I2S_ADC_UNIT ADC_UNIT_1
//I2S built-in ADC channel
#define I2S_ADC_CHANNEL ADC1_CHANNEL_4
/**
* @brief I2S ADC/DAC mode init.
*/
static void example_i2s_init(void)
{
int i2s_num = EXAMPLE_I2S_NUM;
i2s_config_t i2s_config = {
.mode = I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_ADC_BUILT_IN,
.sample_rate = EXAMPLE_I2S_SAMPLE_RATE,
.bits_per_sample = EXAMPLE_I2S_SAMPLE_BITS,
.channel_format = EXAMPLE_I2S_FORMAT,
.intr_alloc_flags = 0,
.dma_buf_count = 2,
.dma_buf_len = 1024,
.use_apll = 0,
};
//install and start i2s driver
TEST_ESP_OK( i2s_driver_install(i2s_num, &i2s_config, 0, NULL) );
//init ADC pad
TEST_ESP_OK( i2s_set_adc_mode(I2S_ADC_UNIT, I2S_ADC_CHANNEL) );
}
static void example_i2s_deinit(void)
{
TEST_ESP_OK( i2s_driver_uninstall(EXAMPLE_I2S_NUM) );
}
/**
* @brief debug buffer data
*/
static void example_disp_buf(uint8_t *buf, int length)
{
printf("\n======");
for (int i = 0; i < length; i += 2) {
uint16_t data = ((uint16_t)buf[i+1] << 8) | (uint16_t)buf[i];
adc_digi_output_data_t *p = (adc_digi_output_data_t *)&data;
if ((i) % 16 == 0) printf("\n");
printf("[%d_%d] ", p->type1.channel, p->type1.data);
}
printf("\n======\n");
}
static esp_err_t adc_dma_data_check(uint8_t *buf, int length, int ideal_level)
{
for (int i = 0; i < length; i += 2) {
uint16_t data = ((uint16_t)buf[i+1] << 8) | (uint16_t)buf[i];
adc_digi_output_data_t *p = (adc_digi_output_data_t *)&data;
if (p->type1.channel != I2S_ADC_CHANNEL) {
TEST_FAIL_MESSAGE("I2S-DMA data channel error!");
}
if (ideal_level == 1) { // high level 3.3v
TEST_ASSERT_EQUAL( 0xFFF, p->type1.data );
} else if (ideal_level == 0) { // low level 0v
TEST_ASSERT_LESS_THAN( 10, p->type1.data );
} else if (ideal_level == 2) { // middle level 1.4v
TEST_ASSERT_INT_WITHIN( 128, 1586, p->type1.data );
} else if (ideal_level == 3) { // normal level
} else { // no check
}
}
return ESP_OK;
}
static void adc_dma_read(uint8_t *buf, int length)
{
size_t bytes_read = 0;
int flash_wr_size = 0;
vTaskDelay(pdTICKS_TO_MS(100));
while (flash_wr_size < length) {
//read data from I2S bus, in this case, from ADC.
TEST_ESP_OK( i2s_read(EXAMPLE_I2S_NUM, (void *) buf + flash_wr_size, length - flash_wr_size, &bytes_read, portMAX_DELAY) );
flash_wr_size += bytes_read;
example_disp_buf((uint8_t *) buf, 128);
}
}
TEST_CASE("ADC DMA read", "[adc dma]")
{
int i2s_read_len = EXAMPLE_I2S_READ_LEN;
char *i2s_read_buff = (char *) calloc(i2s_read_len, sizeof(char));
example_i2s_init();
TEST_ESP_OK( i2s_adc_enable(EXAMPLE_I2S_NUM) );
adc_fake_tie_low(I2S_ADC_UNIT, I2S_ADC_CHANNEL);
adc_dma_read((uint8_t *)i2s_read_buff, i2s_read_len);
adc_dma_data_check((uint8_t *)i2s_read_buff, i2s_read_len, 0);
adc_fake_tie_middle(I2S_ADC_UNIT, I2S_ADC_CHANNEL);
adc_dma_read((uint8_t *)i2s_read_buff, i2s_read_len);
adc_dma_data_check((uint8_t *)i2s_read_buff, i2s_read_len, 2);
adc_fake_tie_high(I2S_ADC_UNIT, I2S_ADC_CHANNEL);
adc_dma_read((uint8_t *)i2s_read_buff, i2s_read_len);
adc_dma_data_check((uint8_t *)i2s_read_buff, i2s_read_len, 1);
adc_io_normal(I2S_ADC_UNIT, I2S_ADC_CHANNEL);
TEST_ESP_OK( i2s_adc_disable(EXAMPLE_I2S_NUM) );
if (i2s_read_buff) {
free(i2s_read_buff);
i2s_read_buff = NULL;
}
example_i2s_deinit();
}
#endif // CONFIG_IDF_TARGET_ESP32