代碼內容，參考網上開源，除錯了兩天，在寫入地址和指標暫存器還有配置config 暫存器，一直回傳nack，不知道這部分錯了哪。
ads1115頭檔案
#ifndef _ADS1115_H
#define _ADS1115_H
#include "stm32f10x.h"
#include "sys.h"
#define SCL PBout(6)
#define SDA_OUT PBout(7)
#define SDA_IN PBin(7)
#define TRUE 1
#define FALSE 0
//*************ADDR Initial********************/
#define ADDRESS ADDRESS_0 //ADDR PIN ->GND
#define ADDRESS_W ADDRESS|0x00 //寫地址
#define ADDRESS_R ADDRESS|0x01 //讀地址
/*************Config Initial*********************/
#define OS OS_1
#define MUX_A0 MUX_4 //AINp=AIN0, AINn=GND
#define MUX_A1 MUX_5 //AINp=AIN1, AINn=GND
#define MUX_A2 MUX_6 //AINp=AIN2, AINn=GND
#define MUX_A3 MUX_7 //AINp=AIN3, AINn=GND
#define PGA PGA_0 //FS=6.144V
#define MODE MODE_0 //Continuous conversion mode
#define DR DR_7 //Data Rate = 860
#define COMP_QUE COMP_QUE_3
/**********ADDR宏定義***************/
#define ADDRESS_0 0x90 //ADDR PIN ->GND
#define ADDRESS_1 0x92 //ADDR PIN ->VDD
#define ADDRESS_2 0x94 //ADDR PIN ->SDA
#define ADDRESS_3 0x96 //ADDR PIN ->SCL
/************POINTER REGISTER*****************/
#define Pointer_0 0x00 //Convertion register
#define Pointer_1 0x01 //Config register
#define Pointer_2 0x02 //Lo_thresh register
#define Pointer_3 0x03 //Hi_thresh register
/************CONFIG REGISTER*****************/
#define OS_0 0x0000
#define OS_1 0x8000
#define MUX_0 0x0000 //AINp=AIN0, AINn=AIN1
#define MUX_1 0x1000 //AINp=AIN0, AINn=AIN3
#define MUX_2 0x2000 //AINp=AIN1, AINn=AIN3
#define MUX_3 0x3000 //AINp=AIN2, AINn=AIN3
#define MUX_4 0x4000 //AINp=AIN0, AINn=GND
#define MUX_5 0x5000 //AINp=AIN1, AINn=GND
#define MUX_6 0x6000 //AINp=AIN2, AINn=GND
#define MUX_7 0x7000 //AINp=AIN3, AINn=GND
#define PGA_0 0x0000 //FS=6.144V
#define PGA_1 0x0200 //FS=4.096V
#define PGA_2 0x0400 //FS=2.048V
#define PGA_3 0x0600 //FS=1.024V
#define PGA_4 0x0800 //FS=0.512V
#define PGA_5 0x0A00 //FS=0.256V
#define PGA_6 0x0C00 //FS=0.256V
#define PGA_7 0x0E00 //FS=0.256V
#define MODE_0 0x0000
#define MODE_1 0x0100
#define DR_0 0x0000 //Data Rate = 8
#define DR_1 0x0020 //Data Rate = 16
#define DR_2 0x0040 //Data Rate = 32
#define DR_3 0x0060 //Data Rate = 64
#define DR_4 0x0080 //Data Rate = 128
#define DR_5 0x00A0 //Data Rate = 250
#define DR_6 0x00C0 //Data Rate = 475
#define DR_7 0x00E0 //Data Rate = 860
#define COMP_MODE_0 0x0000
#define COMP_MODE_1 0x0010
#define COMP_POL_0 0x0000
#define COMP_POL_1 0x0008
#define COMP_LAT_0 0x0000
#define COMP_LAT_1 0x0040
#define COMP_QUE_0 0x0000
#define COMP_QUE_1 0x0001
#define COMP_QUE_2 0x0002
#define COMP_QUE_3 0x0003
void Write_1_Byte( char DataByte);
char Write_N_Byte( char *writebuffer, u8 n);
char Read_1_Byte(void);
void Read_N_Byte( int*readbuff, u8 n);
void InitADS1115(u8 S_MUX_0, u8 S_MUX_1);
u8 WriteWord(void);
u8 ReadWord(void);
float ADS1115(u8 S_MUX_0, u8 S_MUX_1);
#endif
iic 部分函式
/*****************************************************
*功 能：iic1 開始信號
*參 數：無
*回傳值：無
******************************************************/
void Iic1_Start(void)
{
//模式輸出
Iic1_Mode(GPIO_Mode_Out_PP);
SCL_PB6 = 1;
SDA_OUT_PB7 = 1;
Delay_us(5);
SDA_OUT_PB7 = 0;
Delay_us(5);
//SDA與SCL為低鉗住總線
SCL_PB6 = 0;
}
/*****************************************************
*功 能：iic1 停止信號
*參 數：無
*回傳值：無
******************************************************/
void Iic1_Stop(void)
{
//模式輸出
Iic1_Mode(GPIO_Mode_Out_PP);
SCL_PB6 = 0;
SDA_OUT_PB7 = 0;
Delay_us(5);
SCL_PB6 = 1;
Delay_us(5);
//SDA與SCL為高電平，總線空閑
SDA_OUT_PB7 = 1;
}
/*****************************************************
*功 能：iic2 接收一位資料
*參 數：無
*回傳值：ack
******************************************************/
u8 Iic2_Recv_Ack(void)
{
u8 ack;
//模式輸入
Iic2_Mode(GPIO_Mode_IN_FLOATING);
SCL = 0;
Delay_us(5);
SCL = 1;
if(SDA_IN == 1)
{
ack = 1;
}
else
{
ack = 0;
}
Delay_us(5);
SCL = 0;
return ack;
}
ads1115.c
#include "delay.h"
#include "ads1115.h"
#include "i2c.h"
float D_ADS; //轉換的數字量
float VIN_DAS; //輸入的電壓值
u16 Config;
char Writebuff[4],Readbuff[3];
int Result[2];
/***************Write a Byte****************/
void Write_1_Byte(char DataByte)
{
int i;
char data = DataByte;
for(i=0;i<8;i++)
{
if(data & 1<<(7-i) ) //if((DataByte<<i)&0x80)
SDA_OUT=1;
else
SDA_OUT=0;
Delay_us (5);
SCL=1;
Delay_us (5);
SCL=0;
}
SDA_OUT=1;
}
/***************Write N Byte****************/
char Write_N_Byte( char *writebuffer, u8 n)
{
int i;
char data ;
for(i=0;i<n;i++)
{
data = writebuffer[i];
Write_1_Byte(data);
if(!Iic1_Recv_Ack())
{
printf("0x%2x\r\n",data);
Iic1_Stop();
printf("寫入錯誤%d\r\n",i);
return FALSE;
}
}
if(n!=1)
Iic1_Stop();
return TRUE;
}
//***************Read a Byte****************/
char Read_1_Byte(void)
{
unsigned char data_Value = 0, FLAG, i;
for(i=0;i<8;i++)
{
SCL=1;
Delay_us (5);
FLAG=SDA_IN;
data_Value <<= 1;
if( FLAG)
data_Value |= 0x01;
Delay_us (5);
SCL=0;
}
return data_Value;
}
//***************Read N Byte****************/
void Read_N_Byte( int*readbuff, u8 n)
{
unsigned char i;
Iic1_Mode(GPIO_Mode_IN_FLOATING);
for(i=0;i<n;i++)
{
readbuff[i]=Read_1_Byte();
if(i==n-1)
Iic1_Send_Ack(0); //不連續讀位元組
else
Iic1_Send_Ack(1); //連續讀位元組
}
Iic1_Stop();
}
//*****************初始化******************/
void InitADS1115(u8 S_MUX_0, u8 S_MUX_1)
{
if (S_MUX_0 == 0 && S_MUX_1 == 0)
Config = OS+MUX_A0+PGA+DR+COMP_QUE+MODE;
if (S_MUX_0 == 0 && S_MUX_1 == 1)
Config = OS+MUX_A1+PGA+DR+COMP_QUE+MODE;
if (S_MUX_0 == 1 && S_MUX_1 == 0)
Config = OS+MUX_A2+PGA+DR+COMP_QUE+MODE;
if (S_MUX_0 == 1 && S_MUX_1 == 1)
Config = OS+MUX_A3+PGA+DR+COMP_QUE+MODE;
Writebuff[0]=ADDRESS_W;
Writebuff[1]=Pointer_1;
Writebuff[2]=Config/256;
Writebuff[3]=Config%256;
Readbuff[0]=ADDRESS_W;
Readbuff[1]=Pointer_0;
Readbuff[2]=ADDRESS_R;
}
//***************Write a Word***********************/
u8 WriteWord(void)
{
int t;
Iic1_Mode(GPIO_Mode_Out_PP);
Iic1_Start(); //寫入4個位元組
t=Write_N_Byte(Writebuff,4);
if(t==0)
{
printf("WriteWord error\r\n");
return 0;
}
else
return 1;
}
//***************Read Word***********************/
u8 ReadWord(void)
{
int t;
Iic1_Start(); //寫入2個位元組
t=Write_N_Byte(Readbuff,2);
if(t==0)
{
printf("ReadWord1 error\r\n");
return 0;
}
Iic1_Start(); //寫入1個位元組
t=Write_N_Byte(&Readbuff[2],1);
if(t==0)
{
printf("ReadWord2 error\r\n");
return 0;
}
Read_N_Byte(Result,2); //讀出2個位元組
return 1;
}
//***************ADS1115********************/
float ADS1115(u8 S_MUX_0, u8 S_MUX_1)
{
u8 ret;
InitADS1115(S_MUX_0, S_MUX_1);
ret = WriteWord();
if(ret == 0)
return 0;
Delay_ms(1);
ret = ReadWord();
if(ret == 0)
return 0;
Delay_ms(1);
D_ADS=Result[0]*256+Result[1]; //轉換的數字量
VIN_DAS = D_ADS *(float)(5.0 /65,535); //轉換的模擬量電壓
return D_ADS;
}
主函式
while（1）
{
Delay_s(1);
ADS1115(0,0); //第一通道
printf("%f,%f\r\n",VIN_DAS,D_ADS);
}
結果：
uj5u.com熱心網友回復：
應該是實序不對，網上很多程式在特定的某種型別的單片機上跑沒有問題，但是移植到其它單片機上則有問題。uj5u.com熱心網友回復：
給你提供一個我在STM32F103VC上親自驗證通過的SD24XX時鐘芯片的程式。記住時序是否正確的要點是，程式中 while()死回圈是否能夠正常退出，如果能正常退出，說明時序正確；否則，時序錯誤。
https://blog.csdn.net/ba_wang_mao/article/details/103902188
uj5u.com熱心網友回復：
我記得以前也有這個問題，需要在程式里用單片機自己產生一個應答信號來騙自己有應答了，32的代碼已經沒了，我博客里還有一些殘留uj5u.com熱心網友回復：
寫地址回傳nack，要么你的IIC驅動時序有問題，要么就是地址出錯，要么就是器件壞轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/37486.html
標籤：單片機/工控
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