bossay_release_out/app/A17_CH2O/src/CH2O.c

/*
 * Copyright (c) 2020 Nanjing Xiaoxiongpai Intelligent Technology 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 "CH2O.h"
#include "iot_adc.h"
#include "iot_errno.h"
#include "iot_gpio.h"
#include "iot_gpio_ex.h"
#include "iot_pwm.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define CAL_PPM 20 //校准环境中PPM值
#define RL 1       // RL阻值

#define WIFI_IOT_IO_NAME_GPIO_8 8
#define WIFI_IOT_PWM_PORT_PWM1 1
#define WIFI_IOT_IO_FUNC_GPIO_8_PWM1_OUT 5

#define SAFE_LED_GPIO 14
#define WARN_LED_GPIO 7

static float R0; //元件在洁净空气中的阻值

/***************************************************************
 * 函数名称: MQ2Init
 * 说    明: 初始化MQ2Init
 * 参    数: 无
 * 返 回 值: 无
 ***************************************************************/
void BoardInit(void)
{
    IoTGpioInit(SAFE_LED_GPIO);
    IoTGpioSetFunc(SAFE_LED_GPIO, IOT_GPIO_FUNC_GPIO_14_GPIO);
    IoTGpioSetDir(SAFE_LED_GPIO, IOT_GPIO_DIR_OUT); //设置为输出模式

    IoTGpioInit(WARN_LED_GPIO);
    IoTGpioSetFunc(WARN_LED_GPIO, IOT_GPIO_FUNC_GPIO_7_GPIO);
    IoTGpioSetDir(WARN_LED_GPIO, IOT_GPIO_DIR_OUT); //设置为输出模式

    IoTGpioInit(WIFI_IOT_IO_NAME_GPIO_8);                                      //初始化GPIO_8
    IoTGpioSetFunc(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_IO_FUNC_GPIO_8_PWM1_OUT); //设置GPIO_8引脚复用功能为PWM
    IoTGpioSetDir(WIFI_IOT_IO_NAME_GPIO_8, IOT_GPIO_DIR_OUT);                  //设置GPIO_8引脚为输出模式
    IoTPwmInit(WIFI_IOT_PWM_PORT_PWM1);                                        //初始化PWM1端口
}
/***************************************************************
* 函数名称: GetVoltage
* 说    明: 获取电压值函数
* 参    数: 无
*								
* 返 回 值: 无
***************************************************************/
static float GetVoltage(void)
{
    unsigned int ret;
    unsigned short data;

    ret = IoTAdcRead(5, &data, IOT_ADC_EQU_MODEL_8, IOT_ADC_CUR_BAIS_DEFAULT, 0xff);
    if (ret != IOT_SUCCESS)
    {
        printf("ADC Read Fail\n");
    }
    return (float)data * 1.8 * 4 / 4096.0;
}
/***************************************************************
 * 函数名称: GetMQ2PPM
 * 说    明: 获取PPM函数
 * 参    数: ppm 烟雾浓度
 * 返 回 值: 0 成功; -1 失败
 ***************************************************************/
int GetMQ2PPM(float* ppm)
{
    unsigned int ret;
    unsigned short data;
    float voltage, RS;

    ret = IoTAdcRead(6, &data, IOT_ADC_EQU_MODEL_8, IOT_ADC_CUR_BAIS_DEFAULT, 0xff);
    if (ret != 0) {
        printf("ADC Read Fail\n");
        return -1;
    }
    voltage = (float)data * 1.8 * 4 / 4096.0;
    printf("voltage:%2.2fV\n",voltage);
    RS = (5 - voltage) / voltage * RL;     //计算RS
    *ppm = 613.9f * pow(RS / R0, -2.074f); //计算ppm
    return 0;
}

/***************************************************************
 * 函数名称: MQ2PPMCalibration
 * 说    明: 传感器校准函数
 * 参    数: 无
 * 返 回 值: 无
 ***************************************************************/
void MQ2PPMCalibration(void)
{
    float voltage = GetVoltage();
    float RS = (5 - voltage) / voltage * RL;
    R0 = RS / pow(CAL_PPM / 613.9f, 1 / -2.074f);
}

/***************************************************************
 * 函数名称: BeepStatusSet
 * 说    明: 蜂鸣器报警与否
 * 参    数: status,ENUM枚举的数据
 *									OFF,蜂鸣器
 *									ON,开蜂鸣器
 * 返 回 值: 无
 ***************************************************************/
void BeepStatusSet(SwitchStatus status)
{
    if (status == ON) {
        IoTPwmStart(WIFI_IOT_PWM_PORT_PWM1, 50, 4000); //输出PWM波
    }
    if (status == OFF) {
        IoTPwmStop(WIFI_IOT_PWM_PORT_PWM1);
    }
}
/***************************************************************
 * 函数名称: LedSafeStatusSet
 * 说    明: LED_Safe状态设置
 * 参    数: status,ENUM枚举的数据
 *									OFF,关
 *									ON,开
 * 返 回 值: 无
 ***************************************************************/
void LedSafeStatusSet(SwitchStatus status)
{
    if (status == ON) {
        IoTGpioSetOutputVal(SAFE_LED_GPIO, 1); // 设置GPIO_7输出高电平点亮灯
    }
    if (status == OFF) {
        IoTGpioSetOutputVal(SAFE_LED_GPIO, 0); // 设置GPIO_7输出低电平关闭灯
    }
}

/***************************************************************
 * 函数名称: LedWarnStatusSet
 * 说    明: LED_Warn状态设置
 * 参    数: status,ENUM枚举的数据
 *									OFF,关
 *									ON,开
 * 返 回 值: 无
 ***************************************************************/
void LedWarnStatusSet(SwitchStatus status)
{
    if (status == ON) {
        IoTGpioSetOutputVal(WARN_LED_GPIO, 1); // 设置GPIO_14输出高电平点亮灯
    }

    if (status == OFF) {
        IoTGpioSetOutputVal(WARN_LED_GPIO, 0); // 设置GPIO_14输出低电平关闭灯
    }
}