ESP32移植Openharmony外设篇(6)光敏电阻ADC读取 - IT评测·应用市场-qidao123.com技术社区

adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(ADC1_CHANNEL_0,ADC_ATTEN_DB_11);
int val = adc1_get_raw(ADC1_CHANNEL_0);

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/*
* Copyright (c) 2022 Hunan OpenValley Digital Industry Development Co., 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.
*/
#include <stdio.h>
#include "cmsis_os2.h"
#include "ohos_run.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/ledc.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
#define SYS_DELAY_TICKS 200
#define TASK_STACK_SIZE 4096
#define TASK_PRIO 25
#define DEFAULT_VREF 1100 // 默认参考电压，单位mV
static esp_adc_cal_characteristics_t *adc_chars; // 分配内存使用
#define myADC_heat_sensitive_channel ADC_CHANNEL_6 // GPIO34 光敏传感器Ao输入
#define AD_Value1_Channnel myADC_heat_sensitive_channel // 重新定义一个, 为例后续更好的更改
#define width ADC_WIDTH_BIT_12 // ADC分辨率 12位
#define atten ADC_ATTEN_DB_11 // ADC衰减 11 dB 衰减，输入电压范围为 0-3.3V。
#define unit ADC_UNIT_1 // ADC1
#define NO_OF_SAMPLES 128 // 采样次数, 目的: 多次采样, 滤波
/**
* @description: ADC初始化
* @return {无}
*/
void myADC_Init()
{
adc1_config_width(ADC_WIDTH_BIT_12); // 12位分辨率
adc1_config_channel_atten(AD_Value1_Channnel, atten); // 配置ADC通道
adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t)); // 分配内存
esp_adc_cal_characterize(unit, atten, width, DEFAULT_VREF, adc_chars); // 对ADC特性进行初始化
}
/**
* @description: 获取传感器的AD值和电压值
* @param {int16_t} *AD_Value1 第一个传感器的AD值的地址
* @param {float*} Voltage1 第一个传感器的电压值的地址
* @return {*}
*/
void myADC_GetAdAndVoltage_Value(int16_t *AD_Value1, float *Voltage1)
{
uint32_t adc_reading1 = 0;
for (int i = 0; i < NO_OF_SAMPLES; i++)
{ // 多次采样, 滤波
adc_reading1 += adc1_get_raw(AD_Value1_Channnel); // 采集光照值
}
adc_reading1 /= NO_OF_SAMPLES; // 得到滤波后的数据
// esp_adc_cal_raw_to_voltage返回的是mV, 想得到单位V, 除以1000
*AD_Value1 = (int16_t)adc_reading1; // 转换为int16_t类型
*Voltage1 = esp_adc_cal_raw_to_voltage(adc_reading1, adc_chars) / 1000.0; // 获取光照电压值
}
int16_t light_AdVal;
float light_Voltage;
static void gpio_test(void)
{
myADC_Init();
while (1)
{
myADC_GetAdAndVoltage_Value(&light_AdVal, &light_Voltage);
printf("gz adc cal: %d\t gz v: %.2f \n", light_AdVal, light_Voltage);
sleep(2); // 延时
}
}
static void gpio_example_task(void)
{
osThreadAttr_t attr;
int g_taskID;
attr.name = "adc_test";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = TASK_STACK_SIZE;
attr.priority = TASK_PRIO;
g_taskID = osThreadNew((osThreadFunc_t)gpio_test, NULL, &attr);
if (g_taskID == NULL)
{
printf("Failed to create Test GPIO thread!\n");
}
}
OHOS_APP_RUN(gpio_example_task);

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# Copyright (c) 2022 Hunan OpenValley Digital Industry Development Co., 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.
import("//kernel/liteos_m/liteos.gni")
module_name = get_path_info(rebase_path("."), "name")
kernel_module(module_name){
sources = [
"adc_light_test.c",
]
include_dirs = [
"//drivers/hdf_core/framework/include/platform/",
"//drivers/hdf_core/framework/include/utils/",
"//drivers/hdf_core/framework/support/platform/include/adc",
"//drivers/hdf_core/adapter/khdf/liteos_m/osal/include/",
"//drivers/hdf_core/framework/include/core/",
"//drivers/hdf_core/framework/include/osal/",
"//drivers/hdf_core/interfaces/inner_api/utils",
"//device/soc/esp/esp32/components/driver/include",
"//device/soc/esp/esp32/components/esp_adc_cal/include",
"//device/soc/esp/esp32/components/driver/esp32/include",
]
}

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# 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.
import("//kernel/liteos_m/liteos.gni")
module_name = get_path_info(rebase_path("."), "name")
kernel_module(module_name){
sources = [
"uart_example.c",
]
include_dirs = [
"//drivers/hdf_core/framework/include/platform/",
"//drivers/hdf_core/framework/include/utils/",
"//drivers/hdf_core/framework/support/platform/include/gpio",
"//drivers/hdf_core/adapter/khdf/liteos_m/osal/include/",
"//drivers/hdf_core/framework/include/core/",
"//drivers/hdf_core/framework/include/osal/",
"//device/soc/esp/esp32/components/driver/include",
"//device/soc/esp/esp32/components/esp_adc_cal/include",
"//device/soc/esp/esp32/components/driver/esp32/include",
]
}

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衰减	可丈量的输入电压范围
ADC_ATTEN_DB_0	100 mV ~ 950 mV
ADC_ATTEN_DB_2_5	100 mV ~ 1250 mV
ADC_ATTEN_DB_6	150 mV ~ 1750 mV
ADC_ATTEN_DB_11	150 mV ~ 2450 mV

变量	作用
Vout	数字输出效果，代表的是电压。
Dout	ADC原始数字读取效果
Vmax	最大可丈量输入模拟电压
Dmax	输出ADC原始数字读取效果的最大值，在单次读取模式下为4095，在一连读取模式下为4095。