--- /dev/null
+/*
+ Tests for the adc2 device driver
+*/
+#include "esp_system.h"
+#include "driver/adc.h"
+#include "driver/dac.h"
+#include "unity.h"
+#include "esp_system.h"
+#include "esp_event_loop.h"
+#include "esp_wifi.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+
+static const char* TAG = "test_adc2";
+
+#define DEFAULT_SSID "TEST_SSID"
+#define DEFAULT_PWD "TEST_PASS"
+
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+ printf("ev_handle_called.\n");
+ switch(event->event_id) {
+ case SYSTEM_EVENT_STA_START:
+ ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
+ //do not actually connect in test case
+ //;
+ break;
+ case SYSTEM_EVENT_STA_GOT_IP:
+ ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
+ ESP_LOGI(TAG, "got ip:%s\n",
+ ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
+ break;
+ case SYSTEM_EVENT_STA_DISCONNECTED:
+ ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
+ TEST_ESP_OK(esp_wifi_connect());
+ break;
+ default:
+ break;
+ }
+ return ESP_OK;
+}
+
+TEST_CASE("adc2 work with wifi","[adc]")
+{
+ int read_raw;
+ int target_value;
+
+ //adc and dac init
+ TEST_ESP_OK( dac_output_enable( DAC_CHANNEL_1 ));
+ TEST_ESP_OK( dac_output_enable( DAC_CHANNEL_2 ));
+ TEST_ESP_OK( dac_output_voltage( DAC_CHANNEL_1, 30 ));
+ TEST_ESP_OK( dac_output_voltage( DAC_CHANNEL_2, 60 ));
+ TEST_ESP_OK( adc2_config_channel_atten( ADC2_CHANNEL_8, ADC_ATTEN_0db ));
+ TEST_ESP_OK( adc2_config_channel_atten( ADC2_CHANNEL_9, ADC_ATTEN_0db ));
+
+ //init wifi
+ printf("nvs init\n");
+ esp_err_t r = nvs_flash_init();
+ if (r == ESP_ERR_NVS_NO_FREE_PAGES) {
+ printf("no free pages, erase..\n");
+ TEST_ESP_OK(nvs_flash_erase());
+ r = nvs_flash_init();
+ }
+ TEST_ESP_OK( r);
+ tcpip_adapter_init();
+ TEST_ESP_OK(esp_event_loop_init(event_handler, NULL));
+ wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+ TEST_ESP_OK(esp_wifi_init(&cfg));
+ wifi_config_t wifi_config = {
+ .sta = {
+ .ssid = DEFAULT_SSID,
+ .password = DEFAULT_PWD
+ },
+ };
+ TEST_ESP_OK(esp_wifi_set_mode(WIFI_MODE_STA));
+ TEST_ESP_OK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
+
+ //test read value
+ TEST_ESP_OK( adc2_get_raw( ADC2_CHANNEL_8, ADC_WIDTH_12Bit, &read_raw ));
+ target_value = 30*4096*3/256; //3 = 3.3/1.1
+ printf("dac set: %d, adc read: %d (target_value: %d)\n", 30, read_raw, target_value );
+ TEST_ASSERT_INT_WITHIN( 600, target_value, read_raw );
+ TEST_ESP_OK( adc2_get_raw( ADC2_CHANNEL_9, ADC_WIDTH_12Bit, &read_raw ));
+ target_value = 60*4096*3/256;
+ printf("dac set: %d, adc read: %d (target_value: %d)\n", 60, read_raw, target_value );
+ TEST_ASSERT_INT_WITHIN( 600, target_value, read_raw );
+
+ //now start wifi
+ printf("wifi start...\n");
+ TEST_ESP_OK(esp_wifi_start());
+
+ //test reading during wifi on
+ TEST_ASSERT_EQUAL( adc2_get_raw( ADC2_CHANNEL_8, ADC_WIDTH_12Bit, &read_raw ), ESP_ERR_TIMEOUT );
+ TEST_ASSERT_EQUAL( adc2_get_raw( ADC2_CHANNEL_9, ADC_WIDTH_12Bit, &read_raw ), ESP_ERR_TIMEOUT );
+
+ //wifi stop again
+ printf("wifi stop...\n");
+ TEST_ESP_OK( esp_wifi_stop() );
+ TEST_ESP_OK(esp_wifi_deinit());
+ nvs_flash_deinit();
+
+ //test read value
+ TEST_ESP_OK( adc2_get_raw( ADC2_CHANNEL_8, ADC_WIDTH_12Bit, &read_raw ));
+ target_value = 30*4096*3/256; //3 = 3.3/1.1
+ printf("dac set: %d, adc read: %d (target_value: %d)\n", 30, read_raw, target_value );
+ TEST_ASSERT_INT_WITHIN( 600, target_value, read_raw );
+ TEST_ESP_OK( adc2_get_raw( ADC2_CHANNEL_9, ADC_WIDTH_12Bit, &read_raw ));
+ target_value = 60*4096*3/256;
+ printf("dac set: %d, adc read: %d (target_value: %d)\n", 60, read_raw, target_value );
+ TEST_ASSERT_INT_WITHIN( 600, target_value, read_raw );
+
+ printf("test passed...\n");
+
+ TEST_IGNORE_MESSAGE("this test case is ignored due to the critical memory leak of tcpip_adapter and event_loop.");
+}
--- /dev/null
+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := adc2
+
+include $(IDF_PATH)/make/project.mk
+
--- /dev/null
+# Example: ADC2
+
+This test code shows how to configure ADC2 and read the voltage connected to GPIO pin.
+
+
+### ADC2 functions:
+
+ADC1_CHANNEL_7: GPIO27, voltage range [0V..3.1V], the data range [0..4095],
+saturates at about 1.1V.
+
+DAC_CHANNEL_1: GPIO25, output range [0V..3.3V]
+
+
+### Test:
+
+Please choose the channel (GPIO) to output DAC signals and the channel to input
+signals to ADC by menuconfig:
+
+ make menuconfig
+
+Then connect two pins by a wire directly.
+
+E.g. Choose GPIO27 for ADC and GPIO 25 for DAC in menuconfig (default option).
+Then connect them up.
+
+Connection of ADC and DAC to the same pin is also allowed. In this case, you don't
+have to connect by a wire externally. E.g. choose GPIO 26 for both ADC and DAC in
+menuconfig.
+
--- /dev/null
+menu "Example Configuration"
+
+choice ADC2_EXAMPLE_CHANNEL
+ bool "ADC2 Channel Num"
+ default ADC2_EXAMPLE_CHANNEL_7
+ help
+ The channel of ADC2 used in this example.
+
+config ADC2_EXAMPLE_CHANNEL_0
+ bool "ADC2 Channel 0 (GPIO 4)"
+config ADC2_EXAMPLE_CHANNEL_1
+ bool "ADC2 Channel 1 (GPIO 0)"
+config ADC2_EXAMPLE_CHANNEL_2
+ bool "ADC2 Channel 2 (GPIO 2)"
+config ADC2_EXAMPLE_CHANNEL_3
+ bool "ADC2 Channel 3 (GPIO 15)"
+config ADC2_EXAMPLE_CHANNEL_4
+ bool "ADC2 Channel 4 (GPIO 13)"
+config ADC2_EXAMPLE_CHANNEL_5
+ bool "ADC2 Channel 5 (GPIO 12)"
+config ADC2_EXAMPLE_CHANNEL_6
+ bool "ADC2 Channel 6 (GPIO 14)"
+config ADC2_EXAMPLE_CHANNEL_7
+ bool "ADC2 Channel 7 (GPIO 27)"
+config ADC2_EXAMPLE_CHANNEL_8
+ bool "ADC2 Channel 8 (GPIO 25)"
+config ADC2_EXAMPLE_CHANNEL_9
+ bool "ADC2 Channel 9 (GPIO 26)"
+endchoice
+
+config ADC2_EXAMPLE_CHANNEL
+ int
+ default 0 if ADC2_EXAMPLE_CHANNEL_0
+ default 1 if ADC2_EXAMPLE_CHANNEL_1
+ default 2 if ADC2_EXAMPLE_CHANNEL_2
+ default 3 if ADC2_EXAMPLE_CHANNEL_3
+ default 4 if ADC2_EXAMPLE_CHANNEL_4
+ default 5 if ADC2_EXAMPLE_CHANNEL_5
+ default 6 if ADC2_EXAMPLE_CHANNEL_6
+ default 7 if ADC2_EXAMPLE_CHANNEL_7
+ default 8 if ADC2_EXAMPLE_CHANNEL_8
+ default 9 if ADC2_EXAMPLE_CHANNEL_9
+
+choice DAC_EXAMPLE_CHANNEL
+ bool "DAC Channel Num"
+ default DAC_EXAMPLE_CHANNEL_1
+ help
+ The channel of DAC used in this example.
+
+config DAC_EXAMPLE_CHANNEL_1
+ bool "DAC Channel 1 (GPIO25)"
+config DAC_EXAMPLE_CHANNEL_2
+ bool "DAC Channel 2 (GPIO26)"
+endchoice
+
+config DAC_EXAMPLE_CHANNEL
+ int
+ default 1 if DAC_EXAMPLE_CHANNEL_1
+ default 2 if DAC_EXAMPLE_CHANNEL_2
+
+endmenu
--- /dev/null
+/* ADC2 Example
+
+ This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+ Unless required by applicable law or agreed to in writing, this
+ software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+#include "driver/gpio.h"
+#include "driver/adc.h"
+#include "driver/dac.h"
+#include "esp_system.h"
+#include "esp_adc_cal.h"
+
+#define DAC_EXAMPLE_CHANNEL CONFIG_DAC_EXAMPLE_CHANNEL
+#define ADC2_EXAMPLE_CHANNEL CONFIG_ADC2_EXAMPLE_CHANNEL
+
+void app_main(void)
+{
+ uint8_t output_data=0;
+ int read_raw;
+ esp_err_t r;
+
+ gpio_num_t adc_gpio_num, dac_gpio_num;
+
+ assert( adc2_pad_get_io_num( ADC2_EXAMPLE_CHANNEL, &adc_gpio_num ) == ESP_OK );
+ assert( dac_pad_get_io_num( DAC_EXAMPLE_CHANNEL, &dac_gpio_num ) == ESP_OK );
+
+ printf("ADC channel %d @ GPIO %d, DAC channel %d @ GPIO %d.\n", ADC2_EXAMPLE_CHANNEL, adc_gpio_num,
+ DAC_EXAMPLE_CHANNEL, dac_gpio_num );
+
+ dac_output_enable( DAC_EXAMPLE_CHANNEL );
+
+ //be sure to do the init before using adc2.
+ printf("adc2_init...\n");
+ adc2_config_channel_atten( ADC2_EXAMPLE_CHANNEL, ADC_ATTEN_0db );
+
+ vTaskDelay(2 * portTICK_PERIOD_MS);
+
+ printf("start conversion.\n");
+ while(1) {
+ dac_output_voltage( DAC_EXAMPLE_CHANNEL, output_data++ );
+ r = adc2_get_raw( ADC2_EXAMPLE_CHANNEL, ADC_WIDTH_12Bit, &read_raw);
+ if ( r == ESP_OK ) {
+ printf("%d: %d\n", output_data, read_raw );
+ } else if ( r == ESP_ERR_INVALID_STATE ) {
+ printf("ADC2 not initialized yet.\n");
+ } else if ( r == ESP_ERR_TIMEOUT ) {
+ //This can not happen in this example. But if WiFi is in use, such error code could be returned.
+ printf("ADC2 is in use by Wi-Fi.\n");
+ }
+ vTaskDelay( 2 * portTICK_PERIOD_MS );
+ }
+}
--- /dev/null
+#
+# Main Makefile. This is basically the same as a component makefile.
+#
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