441 lines
14 KiB
C
441 lines
14 KiB
C
#include "stm32f4xx.h" // Device header
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#include "stm32f4xx_conf.h"
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#include "MyI2C.h"
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/*
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*函数简介:软件I2C专用us延时
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*参数说明:延时时长,单位1/21us
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*返回类型:无
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*备注:参数范围:0~4294967295
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*/
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void MyI2C_Delay_us(uint32_t us)
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{
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uint32_t temp;
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SysTick->LOAD=us; //时间加载，我们要延时n倍的us, 1us是一个fac_ua周期，所以总共要延时的周期值为二者相乘最后送到Load中。
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SysTick->VAL=0x00; //清空计数器
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; //开启使能位 开始倒数
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do temp=SysTick->CTRL;
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while((temp&0x01) && !(temp&(1<<16))); //用来判断 systick 定时器是否还处于开启状态，然后在等待时间到达，也就是数到0的时候,此时第十六位设置为1
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器使能位
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SysTick->VAL=0x00; //清空计数器
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}
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/*
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*函数简介:软件I2C写SCL电平
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*参数说明:软件I2C配置结构体
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*参数说明:高低电平,0-低电平 1-高电平
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*返回类型:无
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*备注:使用前需要先定义结构体并初始化
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*备注:由于I2C速度较慢,在更改电平之后需要加入延时
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*/
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void MyI2C_SCL(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t x)
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{
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GPIO_WriteBit(MyI2C_InitStructure->MyI2C_SCL_GPIOx,MyI2C_InitStructure->MyI2C_SCL_Pin,(BitAction)(x));
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MyI2C_Delay_us(1);//延时
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}
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/*
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*函数简介:软件I2C写SDA电平
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*参数说明:软件I2C配置结构体
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*参数说明:高低电平,0-低电平 1-高电平
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*返回类型:
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*备注:使用前需要先定义结构体并初始化
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*备注:由于I2C速度较慢,在更改电平之后需要加入延时
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*/
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void MyI2C_SDA(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t x)
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{
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GPIO_WriteBit(MyI2C_InitStructure->MyI2C_SDA_GPIOx,MyI2C_InitStructure->MyI2C_SDA_Pin,(BitAction)(x));
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MyI2C_Delay_us(1);//延时
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}
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/*
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*函数简介:软件I2C读SDA电平
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*参数说明:软件I2C配置结构体
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*返回类型:高低电平,0-低电平 1-高电平
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*备注:使用前需要先定义结构体并初始化
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*备注:由于I2C速度较慢,在电平更改之后需要加入延时,读取时也可以不加
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*/
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uint8_t MyI2C_Read_SDA(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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MyI2C_Delay_us(1);//延时
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uint8_t SDA_Status=GPIO_ReadInputDataBit(MyI2C_InitStructure->MyI2C_SDA_GPIOx,MyI2C_InitStructure->MyI2C_SDA_Pin);
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return SDA_Status;
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}
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/*
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*函数简介:软件I2C初始化
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*参数说明:软件I2C配置结构体
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*返回类型:无
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*备注:使用前需要先定义结构体并初始化
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*/
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void MyI2C_Init(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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RCC_AHB1PeriphClockCmd(MyI2C_InitStructure->MyI2C_SCL_RCC,ENABLE);//开启SCL时钟
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RCC_AHB1PeriphClockCmd(MyI2C_InitStructure->MyI2C_SDA_RCC,ENABLE);//开启SDA时钟
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType=GPIO_OType_OD;//开漏输出
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GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_UP;//默认上拉
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GPIO_InitStructure.GPIO_Pin=MyI2C_InitStructure->MyI2C_SCL_Pin;
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GPIO_InitStructure.GPIO_Speed=GPIO_Speed_100MHz;
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GPIO_Init(MyI2C_InitStructure->MyI2C_SCL_GPIOx,&GPIO_InitStructure);//配置SCL
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GPIO_InitStructure.GPIO_Pin=MyI2C_InitStructure->MyI2C_SDA_Pin;
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GPIO_Init(MyI2C_InitStructure->MyI2C_SDA_GPIOx,&GPIO_InitStructure);//配置SDA
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MyI2C_SCL(MyI2C_InitStructure,1);//初始化SCL
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MyI2C_SDA(MyI2C_InitStructure,1);//初始化SDA
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}
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/*
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*函数简介:软件I2C起始
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*参数说明:软件I2C配置结构体
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*返回类型:无
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*I2C协议:
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* SCL ~~~~/---\___
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* SDA ~~/---\_____
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*/
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void MyI2C_Start(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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MyI2C_SDA(MyI2C_InitStructure,1);
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MyI2C_SCL(MyI2C_InitStructure,1);//复位SCL和SDA
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MyI2C_SDA(MyI2C_InitStructure,0);//起始
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MyI2C_SCL(MyI2C_InitStructure,0);//准备接收数据
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}
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/*
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*函数简介:软件I2C终止
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*参数说明:软件I2C配置结构体
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*返回类型:无
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*I2C协议:
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* SCL ____/-----
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* SDA ~~\___/---
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*/
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void MyI2C_Stop(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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MyI2C_SDA(MyI2C_InitStructure,0);
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MyI2C_SCL(MyI2C_InitStructure,1);//准备接收停止信号
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MyI2C_SDA(MyI2C_InitStructure,1);//终止
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}
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/*
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*函数简介:软件I2C产生应答
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*参数说明:软件I2C配置结构体
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*参数说明:是否应答,0-NAck非应答 1-Ack应答
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*返回类型:无
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*I2C协议:
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* Ack:
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* SCL____/-\___
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* SDA~~\___/---
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* NAck:
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* SCL____/-\___
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* SDA~~/-------
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*/
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void MyI2C_SendAck(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t AckBit)
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{
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MyI2C_SDA(MyI2C_InitStructure,!AckBit);//发送应答情况
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MyI2C_SCL(MyI2C_InitStructure,1);//产生时钟
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MyI2C_SCL(MyI2C_InitStructure,0);
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MyI2C_SDA(MyI2C_InitStructure,1);//释放总线
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}
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/*
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*函数简介:软件I2C接收应答
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*参数说明:软件I2C配置结构体
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*返回类型:是否应答,0-NAck非应答 1-Ack应答
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*I2C协议:
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* SCL ____/-\___
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* SDA ~~/-|==|~~
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* ( )从机
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*/
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uint8_t MyI2C_ReceiveAck(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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uint8_t AckBit;//应答标志位
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MyI2C_SDA(MyI2C_InitStructure,1);//释放SDA总线
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MyI2C_SCL(MyI2C_InitStructure,1);//提示从机发送Ack
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AckBit=!MyI2C_Read_SDA(MyI2C_InitStructure);//接收应答
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MyI2C_SCL(MyI2C_InitStructure,0);//置SCL为0,准备下一轮发送
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return AckBit;//返回应答情况
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}
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/*
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*函数简介:软件I2C发送一个8bits数据
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*参数说明:软件I2C配置结构体
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*参数说明:8bits发送数据
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*返回类型:无
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*I2C协议:
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* SCL ____/-\___/-\___/-\___/-\___/-\___/-\___/-\___/-\___
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* SDA ~~x=====x=====x=====x=====x=====x=====x=====x=====~~
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*/
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void MyI2C_Send8bits(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Byte)
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{
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for(uint8_t i=0;i<8;i++)
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{
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MyI2C_SDA(MyI2C_InitStructure,Byte&(0x80>>i));//发送数据每一位,高位先行
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MyI2C_SCL(MyI2C_InitStructure,1);//产生时钟
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MyI2C_SCL(MyI2C_InitStructure,0);
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}
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MyI2C_SDA(MyI2C_InitStructure,1);//释放SDA总线
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}
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/*
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*函数简介:软件I2C读取一个8bits数据
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*参数说明:软件I2C配置结构体
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*返回类型:8bits接收数据
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*I2C协议:
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* SCL ____/-\_/-\_/-\_/-\_/-\_/-\_/-\_/-\___
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* SDA ~~/-|==============================|~~
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* ( )从机
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*/
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uint8_t MyI2C_Receive8bits(MyI2C_InitTypedef *MyI2C_InitStructure)
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{
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uint8_t Byte=0x00;
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MyI2C_SDA(MyI2C_InitStructure,1);//释放SDA总线
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for(uint8_t i=0;i<8;i++)//读取数据每一位,高位先行
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{
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MyI2C_SCL(MyI2C_InitStructure,1);//产生时钟
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if(MyI2C_Read_SDA(MyI2C_InitStructure)){Byte|=(0x80>>i);}//读取SDA
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MyI2C_SCL(MyI2C_InitStructure,0);
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}
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return Byte;
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}
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/*
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*函数简介:软件I2C发送一个字节数据
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:8bits发送数据
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*返回类型:无
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*备注:无
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*/
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void MyI2C_SendByte(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Address,uint8_t Byte)
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{
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,Address<<1);//发送设备地址(写)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Send8bits(MyI2C_InitStructure,Byte);//发送数据
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Stop(MyI2C_InitStructure);//终止
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}
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/*
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*函数简介:软件I2C发送数据
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:发送数据数组
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*参数说明:发送数据数组长度
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*返回类型:无
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*备注:无
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*/
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void MyI2C_SendData(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Address,uint8_t *Data,uint16_t Length)
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{
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,Address<<1);//发送设备地址(写)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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for(uint16_t i=0;i<Length;i++)
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{
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MyI2C_Send8bits(MyI2C_InitStructure,Data[i]);//发送数据
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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}
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MyI2C_Stop(MyI2C_InitStructure);//终止
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}
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/*
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*函数简介:软件I2C写寄存器
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:8bits寄存器地址
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*参数说明:8bits数据
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*返回类型:无
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*备注:无
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*/
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void MyI2C_WriteRegister(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t SlaveAddress,uint8_t RegAddress,uint8_t Data)
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{
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,SlaveAddress<<1);//发送从机地址(写)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Send8bits(MyI2C_InitStructure,RegAddress);//发送寄存器地址
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Send8bits(MyI2C_InitStructure,Data);//发送数据
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Stop(MyI2C_InitStructure);//终止
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}
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/*
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*函数简介:软件I2C接收一个字节数据
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*返回类型:8bits接收数据
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*备注:无
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*/
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uint8_t MyI2C_ReceiveByte(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Address)
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{
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uint8_t Byte=0;
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,(Address<<1) | 0x01);//发送设备地址(读)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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Byte=MyI2C_Receive8bits(MyI2C_InitStructure);//接收数据
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MyI2C_SendAck(MyI2C_InitStructure,0);//发送NAck
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MyI2C_Stop(MyI2C_InitStructure);//终止
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return Byte;
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}
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/*
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*函数简介:软件I2C接收数据
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:接收数据数组
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*参数说明:接收数据数组长度
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*返回类型:8bits接收数据
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*备注:无
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*/
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void MyI2C_ReceiveData(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Address,uint8_t *Data,uint16_t Length)
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{
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,(Address<<1) | 0x01);//发送设备地址(读)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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for(uint16_t i=0;i<Length-1;i++)
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{
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Data[i]=MyI2C_Receive8bits(MyI2C_InitStructure);//接收数据
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MyI2C_SendAck(MyI2C_InitStructure,1);//发送Ack
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}
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Data[Length-1]=MyI2C_Receive8bits(MyI2C_InitStructure);//接收最后一个数据
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MyI2C_SendAck(MyI2C_InitStructure,0);//发送NAck
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MyI2C_Stop(MyI2C_InitStructure);//终止
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}
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/*
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*函数简介:软件I2C读寄存器
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:8bits寄存器地址
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*返回类型:8bits数据
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*备注:无
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*/
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uint8_t MyI2C_ReadRegister(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t SlaveAddress,uint8_t RegAddress)
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{
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uint8_t Byte=0;
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,SlaveAddress<<1);//发送从机地址(写)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Send8bits(MyI2C_InitStructure,RegAddress);//发送寄存器地址
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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MyI2C_Start(MyI2C_InitStructure);//重复起始
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MyI2C_Send8bits(MyI2C_InitStructure,(SlaveAddress<<1) | 0x01);//发送设备地址(读)
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while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
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Byte=MyI2C_Receive8bits(MyI2C_InitStructure);//接收数据
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MyI2C_SendAck(MyI2C_InitStructure,0);//发送NAck
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MyI2C_Stop(MyI2C_InitStructure);//终止
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return Byte;
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}
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/*
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*函数简介:软件I2C连续读寄存器
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*参数说明:软件I2C配置结构体
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*参数说明:7bits从机地址
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*参数说明:8bits寄存器首地址
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*参数说明:接收数据数组
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*参数说明:接收数据数组长度
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*返回类型:无
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*备注:无
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*/
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void MyI2C_ContinuousReadRegister(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t SlaveAddress,uint8_t RegStartAddress,uint8_t *ReceiveData,uint16_t Length)
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{
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MyI2C_Start(MyI2C_InitStructure);//起始
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MyI2C_Send8bits(MyI2C_InitStructure,SlaveAddress<<1);//发送从机地址(写)
|
||
while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
|
||
MyI2C_Send8bits(MyI2C_InitStructure,RegStartAddress);//发送寄存器地址
|
||
while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
|
||
|
||
MyI2C_Start(MyI2C_InitStructure);//重复起始
|
||
|
||
MyI2C_Send8bits(MyI2C_InitStructure,(SlaveAddress<<1) | 0x01);//发送设备地址(读)
|
||
while(MyI2C_ReceiveAck(MyI2C_InitStructure)!=1);//等待Ack应答
|
||
|
||
for(uint16_t i=0;i<Length-1;i++)
|
||
{
|
||
ReceiveData[i]=MyI2C_Receive8bits(MyI2C_InitStructure);//接收数据
|
||
MyI2C_SendAck(MyI2C_InitStructure,1);//发送Ack
|
||
}
|
||
ReceiveData[Length-1]=MyI2C_Receive8bits(MyI2C_InitStructure);//接收最后一个数据
|
||
MyI2C_SendAck(MyI2C_InitStructure,0);//发送NAck
|
||
|
||
MyI2C_Stop(MyI2C_InitStructure);//终止
|
||
}
|
||
|
||
/*
|
||
*函数简介:软件I2C检测设备状态
|
||
*参数说明:软件I2C配置结构体
|
||
*参数说明:7bits从机地址
|
||
*返回类型:工作状态,0-设备不存在或异常工作 1-设备正常工作
|
||
*备注:无
|
||
*/
|
||
uint8_t MyI2C_CheckDevice(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t Address)
|
||
{
|
||
uint8_t WorkStatus;//工作标志位
|
||
MyI2C_Start(MyI2C_InitStructure);//起始
|
||
|
||
MyI2C_Send8bits(MyI2C_InitStructure,Address<<1);//发送设备地址(写)
|
||
WorkStatus=MyI2C_ReceiveAck(MyI2C_InitStructure);//检测Ack应答
|
||
|
||
MyI2C_Stop(MyI2C_InitStructure);//终止
|
||
return WorkStatus;
|
||
}
|
||
|
||
/*
|
||
*函数简介:软件I2C查询Who Am I寄存器
|
||
*参数说明:软件I2C配置结构体
|
||
*参数说明:7bits从机地址
|
||
*参数说明:8bits Who Am I寄存器地址
|
||
*返回类型:Who Am I寄存器的值,0-设备不存在或异常工作 其他-返回寄存器值
|
||
*备注:无
|
||
*/
|
||
uint8_t MyI2C_CheckWhoAmI(MyI2C_InitTypedef *MyI2C_InitStructure,uint8_t SlaveAddress,uint8_t WhoAmIAddress)
|
||
{
|
||
uint8_t WhoAmI;
|
||
MyI2C_Start(MyI2C_InitStructure);//起始
|
||
|
||
MyI2C_Send8bits(MyI2C_InitStructure,SlaveAddress<<1);//发送设备地址(写)
|
||
if(MyI2C_ReceiveAck(MyI2C_InitStructure)==0)return 0;//检测Ack应答
|
||
MyI2C_Send8bits(MyI2C_InitStructure,WhoAmIAddress);//发送寄存器地址
|
||
if(MyI2C_ReceiveAck(MyI2C_InitStructure)==0)return 0;//检测Ack应答
|
||
|
||
MyI2C_Start(MyI2C_InitStructure);//重复起始
|
||
|
||
MyI2C_Send8bits(MyI2C_InitStructure,(SlaveAddress<<1) | 0x01);//发送设备地址(读)
|
||
if(MyI2C_ReceiveAck(MyI2C_InitStructure)==0)return 0;//检测Ack应答
|
||
|
||
WhoAmI=MyI2C_Receive8bits(MyI2C_InitStructure);//接收数据
|
||
MyI2C_SendAck(MyI2C_InitStructure,0);//发送NAck
|
||
|
||
MyI2C_Stop(MyI2C_InitStructure);//终止
|
||
return WhoAmI;
|
||
}
|