ESP32驱动AD7705

ESP32 系列文章
1、利用mesh ble_mesh_provisioner和 onoff_server建立网络传输温湿度以及pm2.5等数据
2、esp-idf v4.0 smartconfig wifi配置信息保存在nvs_flash，实现掉电重新启动直接连入wifi(已完成)
3、idf v4.0 调试esp-aliyun-master 生成对应的 NVS 分区

一、概述

该博客介绍使用软件模拟 SPI驱动16位 ADTM7705(兼容AD7705）
TM7705 使用SPI串行通信协议，使用十分方便快捷．并且兼容 2.7~3.3V 或 4.75~5.25V 单电源。可以直接使用单片机引脚进行供电． TM7705 是用于智能系统、微控制器系统和基于 DSP 系统的理想产品。其串行接口可配置为三线接口。增益值、信号极性以及更新速率的选择可用串行输入口由软件来配置。该器件还包括自校准和系统校准选项,以消除器件本身或系统的增益和偏移误差。TM7705 采用 16 脚塑料双列直插(DIP)和 16 脚宽体(0.3 英寸)SOIC 封装和 16 脚 TSSOP 封装。

二、特点

 TM7705:2 个全差分输入通道的 ADC16 位无丢失代码0.003%非线性可编程增益前端增益:1~128三线串行接口有对模拟输入缓冲的能力2.7~3.3V 或 4.75~5.25V 工作电压3V 电压时,最大功耗为 1mW等待电流的最大值为 8μA16 脚 DIP、SOIC 和 TSSOP 封装

三．引脚排列

四．引脚功能

五.代码讲解
esp32WROOM 32D 驱动AD 7705代码
AD7705.h头文件

#include "driver/gpio.h"#ifndef __AD7705_H__
#define __AD7705_H__#define ADC_DI 23//DIN引脚
#define ADC_DO1 25//DOUT引脚
#define ADC_CLK 19//SCK引脚
#define ADC_RESET 18//RST引脚#define ADC1_CS 22//CS引脚
#define ADC1_DRDY1 21//DRDY引脚#define ADC_CLK0 gpio_set_level(ADC_CLK, 0)//CLK引脚设置为低电平
#define ADC_CLK1 gpio_set_level(ADC_CLK, 1)//CLK引脚设置为高电平#define ADC_RESET0 gpio_set_level(ADC_RESET, 0)//RST引脚设置为低电平
#define ADC_RESET1 gpio_set_level(ADC_RESET, 1)//RST引脚设置为高电平#define ADC_DI0 gpio_set_level(ADC_DI, 0)//DIN引脚设置为低电平
#define ADC_DI1 gpio_set_level(ADC_DI, 1)//DIN引脚设置为高电平#define ADC1_CS0 gpio_set_level(ADC1_CS, 0)//CS引脚设置为低电平
#define ADC1_CS1 gpio_set_level(ADC1_CS, 1)//CS引脚设置为高电平#define ADC_DO gpio_get_level(ADC_DO1)//获取DOUT引脚电平
#define ADC1_DRDY gpio_get_level(ADC1_DRDY1)//获取DRDY引脚电平
//Operation modes
#define ADC_NORMAL          0x00
#define ADC_SELF            0x40
#define ADC_ZERO_SCALE      0x80
#define ADC_FULL_SCALE      0xc0//Gain settings
#define ADC_GAIN_1          0x00
#define ADC_GAIN_2          0x08
#define ADC_GAIN_4          0x10
#define ADC_GAIN_8          0x18
#define ADC_GAIN_16         0x20
#define ADC_GAIN_32         0x28
#define ADC_GAIN_64         0x30
#define ADC_GAIN_128        0x38//Polar operations
#define ADC_BIPOLAR         0x00
#define ADC_UNIPOLAR        0x04//update rates
#define ADC_50              0x04
#define ADC_60              0x05
#define ADC_250             0x06
#define ADC_500             0x07
extern void TM7705_CaliSelf(unsigned char ch);
extern void adc_rest();
extern void adc1_init(unsigned char calmode, unsigned char gainsetting, unsigned char operation, unsigned char rate);
extern unsigned int adc1_read_value(unsigned char ch);
#endif

AD7705.C文件


#include "AD7705.h"
#include "driver/gpio.h"
enum
{REG_COMM   = 0x00,    //通信寄存器REG_SETUP    = 0x10,//设置寄存器REG_CLOCK    = 0x20,    //时钟寄存器REG_DATA = 0x30,    //数据寄存器REG_ZERO_CH1 = 0x60,    //CH1偏移寄存器REG_FULL_CH1  = 0x70,//CH1满量程寄存器REG_ZERO_CH2 = 0x61,    //CH2偏移寄存器REG_FULL_CH2  = 0x71,    //CH２满量程寄存器WRITE         = 0x00,    //写操作READ       = 0x08,    //读操作CH_1       = 0,CH_2       = 1,CH_3       = 2,   CH_4        = 3
};
enum
{CLKDIS_0   = 0x00,        //时钟输出使能CLKDIS_1    = 0x10,    //时钟禁止CLK_4_9152M = 0x08,//4.9152MHZ晶振CLK_2_4576M = 0x00,//2.456MHZ晶振CLK_1M       = 0x04,CLK_2M      = 0x0C,FS_50HZ     = 0x00,FS_60HZ     = 0x01,FS_250HZ    = 0x02,FS_500HZ    = 0x04,ZERO_0      = 0x00,ZERO_1      = 0x80
};
enum
{MD_NORMAL      = (0 << 6),  //正常模式MD_CAL_SELF       = (1 << 6),  //自校准模式MD_CAL_ZERO      = (2 << 6),  //标准零刻度模式MD_CAL_FULL        = (3 << 6),//标准满刻度模式GAIN_1           = (0 << 3),//增益GAIN_2            = (1 << 3),  //增益GAIN_4          = (2 << 3),//增益GAIN_8            = (3 << 3),//增益GAIN_16           = (4 << 3),  //增益GAIN_32         = (5 << 3),  //增益GAIN_64         = (6 << 3),//增益GAIN_128      = (7 << 3),//增益BIPOLAR           = (0 << 2),  //双极性输入UNIPOLAR     = (1 << 2),  //单极性输入BUF_NO           = (0 << 1),  BUF_EN          = (1 << 1),FSYNC_0           = 0,FSYNC_1            = 1
};
/*通道１和通道２　的增益，输入缓冲，极性设置*/
#define _CH1_GAIN_BIPOLAR_BUF (GAIN_1|UNIPOLAR|BUF_EN)
#define _CH2_GAIN_BIPOLAR_BUF (GAIN_1|UNIPOLAR|BUF_EN)void adc_delay(unsigned char NUM) //延时函数      {for(;NUM>0;NUM--);       }void write_adc_byte(unsigned char chr)//写字节函数
{unsigned char i;for(i=0;i<8;i++)//循环写八次{if (chr & 0x80)//位与操作，写出数据{ADC_DI1;//SPI 数据MOSI 接口　按位输出}else{ADC_DI0;//SPI 数据MOSI 接口}ADC_CLK0;//时钟信号chr=chr<<1;//右移一位数据，循环按位写出数据ADC_CLK1;}//ADC_CLK1;
}unsigned int read_adc_word()//读数据函数
{unsigned char i;unsigned int coder = 0;for(i=0;i<16;i++)//16位数据，循环读入两个字节{ADC_CLK0;//时钟信号adc_delay(1);coder = coder<<1;if(ADC_DO)coder+=1;   //检测引脚电平，读入数据    ADC_CLK1;}ADC_CLK1;return(coder);
}void adc_rest()//AD 7705复位函数
{unsigned char i,j;ADC_DI1;ADC_CLK1; ADC1_CS1;ADC_RESET1;for(i=200;i>0;i--)for(j=200;j>0;j--);  ADC_RESET0;for(i=400;i>0;i--)for(j=200;j>0;j--);    ADC_RESET1;for(i=200;i>0;i--)for(j=200;j>0;j--);    }
void TM7705_CaliSelf(unsigned char ch)//自校准函数
{if(ch==1){ADC1_CS0;write_adc_byte(REG_SETUP|WRITE|CH_1);ADC1_CS1;adc_delay(10);ADC1_CS0;write_adc_byte(MD_CAL_SELF|_CH1_GAIN_BIPOLAR_BUF|FSYNC_0);ADC1_CS1;adc_delay(10);ADC1_CS0;while (ADC1_DRDY);ADC1_CS1;}else if(ch==2){ADC1_CS0;write_adc_byte(REG_SETUP|WRITE|CH_2);ADC1_CS1;adc_delay(10);ADC1_CS0;write_adc_byte(MD_CAL_SELF|_CH2_GAIN_BIPOLAR_BUF|FSYNC_0);ADC1_CS1;adc_delay(10);ADC1_CS0;while (ADC1_DRDY);ADC1_CS1;}}
void adc1_init(unsigned char calmode, unsigned char gainsetting, unsigned char operation, unsigned char rate)
{ADC1_CS0;write_adc_byte(0xFF);write_adc_byte(0xFF);write_adc_byte(0xFF);write_adc_byte(0xFF);ADC1_CS1;adc_delay(100);ADC1_CS0;//write_adc_byte( 0x20 );//write_adc_byte( REG_CLOCK|WRITE|CH_1 );//ADC1_CS1;adc_delay(100); ADC1_CS0;write_adc_byte( CLKDIS_0|CLK_4_9152M|FS_50HZ );//ADC1_CS1;TM7705_CaliSelf(1);TM7705_CaliSelf(2);adc_delay(100);
}unsigned int adc1_read_value(unsigned char ch)
{unsigned int  value;if(!ADC1_DRDY){ADC1_CS0;if(ch == 1)write_adc_byte(0x38);//else if(ch == 2)write_adc_byte(0x39);//else    {ADC1_CS1;return 0;}ADC1_CS1;adc_delay(1);ADC1_CS0;value = read_adc_word();ADC1_CS1;return value;}else{return 0;}
}

main.c文件

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/gpio.h"
#include "AD7705.h"
void delay(unsigned int NUM)            {unsigned int i;unsigned char j;for(i=NUM;i>0;i--)for(j=200;j>0;j--);        }
void app_main(void)
{  int volt1,volt2;unsigned char i,stat=0x03;
unsigned int temp1,temp2,ADcode1,ADcode2;//Initialize non-SPI GPIOsgpio_set_direction(ADC_CLK, GPIO_MODE_OUTPUT);gpio_set_direction(ADC_RESET, GPIO_MODE_OUTPUT);gpio_set_direction(ADC1_CS, GPIO_MODE_OUTPUT);gpio_set_direction(ADC_DI, GPIO_MODE_OUTPUT);gpio_set_pull_mode(ADC_DO1,GPIO_PULLUP_ENABLE);gpio_set_direction(ADC_DO1, GPIO_MODE_INPUT);gpio_set_direction(ADC1_DRDY1, GPIO_MODE_INPUT);adc_rest();adc1_init(ADC_SELF,ADC_GAIN_128,ADC_BIPOLAR,ADC_50);TM7705_CaliSelf(1);temp1 = adc1_read_value(1);TM7705_CaliSelf(2);temp2 = adc1_read_value(2);while(1){printf("初始化代码\n");vTaskDelay(500/ portTICK_PERIOD_MS);temp1 = adc1_read_value(1);volt1=((int)temp1*5000)/65536;printf("channel1:   %d    V:%d\n",temp1,volt1);vTaskDelay(500/ portTICK_PERIOD_MS);temp2 = adc1_read_value(2);volt2=((int)temp2*5000)/65536;printf("channel2:   %d    V:%d\n",temp2,volt2);}
}