STM32 模拟IIC源代码多个I2C减少冗余代码

发表于 2022-10-14 22:45

当设计中使用I2C的数量多于1个时，其底层I2C的代码逻辑都是一样的，只有IO口变了，为此还要复制粘贴、修改IO，不仅费时，而且还浪费片内资源，因此可以使用指针来重复执行IIC底层代码，实现一个代码，多个IO使用。
注意：使用什么IO口，一定要打开其IO时钟，同时配置为输出开漏模式！！！
使用例程在最下面

Stm32f30x_SMLT_I2C.h

#ifndef __Stm32f30x_SMLT_I2C_H
#define __Stm32f30x_SMLT_I2C_H
//========================= Include ===============================================================
#include "stm32f30x.h"
//========================= Variable ==============================================================
typedef struct
{
GPIO_TypeDef* SDA_GPIO; //SDA的GPIO组地址
GPIO_TypeDef* SCL_GPIO; //SCL的GPIO组地址
uint32_t SDA_SBIT; //SDA 在 BSRR寄存器中的置位
uint32_t SDA_RBIT; //SDA 在 BSRR寄存器中的复位
uint32_t SCL_SBIT; //SCL 在 BSRR寄存器中的置位
uint32_t SCL_RBIT; //SCL 在 BSRR寄存器中的复位
uint32_t SDA_MODER; //SDA 在 MODER寄存器中的配置位
uint32_t SDA_MODER_0; //SDA 在 MODER寄存器中的配置位低位
uint32_t SDA_MODER_1; //SDA 在 MODER寄存器中的配置位高位
uint8_t SCL_Delay; //SCL的延时参数调整波特率越大波特率越大
}I2C_Struct;
extern I2C_Struct S_I2C_IO[2];//------------------------------------- 修改处
//（想要3个的话，数组添加，下面的define也要添加，初始化函数S_I2C_Init中也要添加）
//========================= I2C1_Define ================================================================
//--------------------------SDA-------------------------------------- 修改处
#define S_I2C1_SDA_GPIO GPIOE
#define S_I2C1_SDA_BIT 0
//--------------------------SCL-------------------------------------- 修改处
#define S_I2C1_SCL_GPIO GPIOE
#define S_I2C1_SCL_BIT 1
#define S_I2C1_SCL_DELAY 0x80
//还需配置结构体初始化函数 S_I2C_Init 别忘了打开时钟及开漏配置
//========================= I2C2_Define ================================================================
//--------------------------SDA-------------------------------------- 修改处
#define S_I2C2_SDA_GPIO GPIOE
#define S_I2C2_SDA_BIT 11
//--------------------------SCL-------------------------------------- 修改处
#define S_I2C2_SCL_GPIO GPIOB
#define S_I2C2_SCL_BIT 13
#define S_I2C2_SCL_DELAY 0x10
//还需配置结构体初始化函数 S_I2C_Init 别忘了打开时钟及开漏配置
// //========================= I2Cx_Define ================================================================
// //--------------------------SDA-------------------------------------- 修改处
// #define S_I2Cx_SDA_GPIO GPIOx
// #define S_I2Cx_SDA_BIT x
// //--------------------------SCL-------------------------------------- 修改处
// #define S_I2Cx_SCL_GPIO GPIOx
// #define S_I2Cx_SCL_BIT x
// #define S_I2Cx_SCL_DELAY x
// //添加在此添加
//========================= Function ==============================================================
void S_I2C_Init(void);//--------------------------------------------- 修改处
void S_I2C_Start(I2C_Struct I2C_temp);
void S_I2C_Stop(I2C_Struct I2C_temp);
uint8_t S_I2C_SendByte(I2C_Struct I2C_temp, uint8_t byte);
uint8_t S_I2C_ReceiveByte(I2C_Struct I2C_temp, uint8_t nack);
uint8_t S_I2C_WriteRegister(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t data);
uint8_t S_I2C_ReadRegister(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t amount, uint8_t* data, uint8_t typ);
uint8_t S_I2C_PointerRead(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t amount, uint8_t* data, uint8_t typ);
//========================= Define ================================================================
//通过宏定义将IO结构体直接放入基础函数中
//-------------------------- I2C1 -----------------------------------
#define S_I2C1_Start() S_I2C_Start(S_I2C_IO[0])
#define S_I2C1_Stop() S_I2C_Stop(S_I2C_IO[0])
#define S_I2C1_SendByte(byte) S_I2C_SendByte(S_I2C_IO[0], byte)
#define S_I2C1_ReceiveByte(nack) S_I2C_ReceiveByte(S_I2C_IO[0], nack)
#define S_I2C1_WriteRegister(addr, regAddr, data) S_I2C_WriteRegister(S_I2C_IO[0], addr, regAddr, data)
#define S_I2C1_ReadRegister(addr, regAddr, amount, data, typ) S_I2C_ReadRegister(S_I2C_IO[0], addr, regAddr, amount, data, typ)
#define S_I2C1_PointerRead(addr, regAddr, amount, data, typ) S_I2C_PointerRead(S_I2C_IO[0], addr, regAddr, amount, data, typ)
//-------------------------- I2C2 -----------------------------------
#define S_I2C2_Start() S_I2C_Start(S_I2C_IO[1])
#define S_I2C2_Stop() S_I2C_Stop(S_I2C_IO[1])
#define S_I2C2_SendByte(byte) S_I2C_SendByte(S_I2C_IO[1], byte)
#define S_I2C2_ReceiveByte(nack) S_I2C_ReceiveByte(S_I2C_IO[1], nack)
#define S_I2C2_WriteRegister(addr, regAddr, data) S_I2C_WriteRegister(S_I2C_IO[1], addr, regAddr, data)
#define S_I2C2_ReadRegister(addr, regAddr, amount, data, typ) S_I2C_ReadRegister(S_I2C_IO[1], addr, regAddr, amount, data, typ)
#define S_I2C2_PointerRead(addr, regAddr, amount, data, typ) S_I2C_PointerRead(S_I2C_IO[1], addr, regAddr, amount, data, typ)
//-------------------------- Another --------------------------------
#define ACK 0
#define NACK 1
#define FAILED 0
#define SUCCEED 1
#define ARRAY 0
#define STRUCT 1
//=================================================================================================
#endif

复制代码

Stm32f30x_SMLT_I2C.c

#include "Stm32f30x_SMLT_I2C.h"
I2C_Struct S_I2C_IO[2];//IO口结构体，通过.h文件定义使用的引脚
/**
* @description: I2C结构体IO初始化
* @param {I2C_Struct*} I2C_temp I2C的IO结构体
* @param {GPIO_TypeDef*} SDA_GPIO I2C SDA GPIO（GPIOA~GPIOx)
* @param {uint8_t} SDA_BIT I2C SDA引脚号（1~16）
* @param {GPIO_TypeDef*} SCL_GPIO I2C SCL GPIO（GPIOA~GPIOx)
* @param {uint8_t} SCL_BIT I2C SCL引脚号（1~16）
* @param {uint8_t} SCL_Delay I2C SCL时钟延时（0x00~0xff）越大波特率越低
* @return {*}
*/
void S_I2C_Struct_Init(I2C_Struct* I2C_temp, GPIO_TypeDef* SDA_GPIO, uint8_t SDA_BIT, GPIO_TypeDef* SCL_GPIO, uint8_t SCL_BIT, uint8_t SCL_Delay)
{
I2C_temp->SDA_GPIO = SDA_GPIO;
I2C_temp->SCL_GPIO = SCL_GPIO;
I2C_temp->SDA_SBIT = (0x00000001 << SDA_BIT);
I2C_temp->SDA_RBIT = (0x00010000 << SDA_BIT);
I2C_temp->SCL_SBIT = (0x00000001 << SCL_BIT);
I2C_temp->SCL_RBIT = (0x00010000 << SCL_BIT);
I2C_temp->SDA_MODER = 0x00000003 << (SDA_BIT << 1);
I2C_temp->SDA_MODER_0 = 0x00000001 << (SDA_BIT << 1);
I2C_temp->SDA_MODER_1 = 0x00000002 << (SDA_BIT << 1);
I2C_temp->SCL_Delay = SCL_Delay;
}
/**
* @description: I2C结构体总初始化，将计算的各个变量存入结构体中
* @param {*}
* @return {*}
*/
void S_I2C_Init(void)
{
S_I2C_Struct_Init(&S_I2C_IO[0], S_I2C1_SDA_GPIO, S_I2C1_SDA_BIT, S_I2C1_SCL_GPIO, S_I2C1_SCL_BIT, S_I2C1_SCL_DELAY);
S_I2C_Struct_Init(&S_I2C_IO[1], S_I2C2_SDA_GPIO, S_I2C2_SDA_BIT, S_I2C2_SCL_GPIO, S_I2C2_SCL_BIT, S_I2C2_SCL_DELAY);
// S_I2C_Struct_Init(&S_I2C_IO[x], S_I2Cx_SDA_GPIO, S_I2Cx_SDA_BIT, S_I2Cx_SCL_GPIO, S_I2Cx_SCL_BIT, S_I2Cx_SCL_DELAY);//添加在此添加
}
/**
* @description: I2C时钟延时，调整波特率
* @param {*}
* @return {*}
*/
void S_I2C_Delay(uint8_t temp)
{
for ( ; temp; temp--)
{
/* code */
}
}
/**
* @description: 产生起始信号
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @return {*}
*/
void S_I2C_Start(I2C_Struct I2C_temp)
{
I2C_temp.SDA_GPIO->MODER |= I2C_temp.SDA_MODER_0;
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_SBIT;
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
}
/**
* @description: 产生停止信号
* @param {I2C_Struct} I2C_temp
* @return {*}
*/
void S_I2C_Stop(I2C_Struct I2C_temp)
{
I2C_temp.SDA_GPIO->MODER |= I2C_temp.SDA_MODER_0;
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_SBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
}
/**
* @description: 发送一个字节数据
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @param {uint8_t} byte 数据
* @return {uint8_t} NACK
* ACK
*/
uint8_t S_I2C_SendByte(I2C_Struct I2C_temp, uint8_t byte)
{
uint8_t temp = 0x00;
for(uint8_t i = 0x80; i; i >>= 1)
{
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
if(byte & i)
{
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_SBIT;
}
else
{
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
}
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
}
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
I2C_temp.SDA_GPIO->MODER &= ~I2C_temp.SDA_MODER;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
if(I2C_temp.SDA_GPIO -> IDR & I2C_temp.SDA_SBIT)
{
temp = NACK;
}
else
{
temp = ACK;
}
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
I2C_temp.SDA_GPIO->MODER |= I2C_temp.SDA_MODER_0;
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
return temp;
}
/**
* @description: 接收一个字节数据
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @param {uint8_t} nack 接收后结束要发送的应答信号
* NACK
* ACK
* @return {uint8_t} 接收到的字节
*/
uint8_t S_I2C_ReceiveByte(I2C_Struct I2C_temp, uint8_t nack)
{
uint8_t byte = 0x00;
I2C_temp.SDA_GPIO->MODER &= ~I2C_temp.SDA_MODER;
for (uint8_t i = 8; i; i--)
{
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
byte <<= 1;
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
if(I2C_temp.SDA_GPIO -> IDR & I2C_temp.SDA_SBIT)
{
byte |= 0x01;
}
S_I2C_Delay(I2C_temp.SCL_Delay);
}
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
I2C_temp.SDA_GPIO->MODER |= I2C_temp.SDA_MODER_0;
if(nack)
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_SBIT;
else
I2C_temp.SDA_GPIO->BSRR |= I2C_temp.SDA_RBIT;
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_RBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
I2C_temp.SCL_GPIO->BSRR |= I2C_temp.SCL_SBIT;
S_I2C_Delay(I2C_temp.SCL_Delay);
return byte;
}
/**
* @description: 写一个字节的寄存器
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @param {uint8_t} addr 器件地址(0x00~0x7f)
* @param {uint8_t} regAddr 寄存器地址(0x00~0xff)
* @param {uint8_t} data 数据
* @return {uint8_t} FAILED 失败
* SUCCEED 成功
*/
uint8_t S_I2C_WriteRegister(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t data)
{
addr <<= 1;
S_I2C_Start(I2C_temp);
if(S_I2C_SendByte(I2C_temp, addr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
if(S_I2C_SendByte(I2C_temp, regAddr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
if(S_I2C_SendByte(I2C_temp, data) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
S_I2C_Stop(I2C_temp);
return SUCCEED;
}
/**
* @description: 读取器件，读取格式：器件读-寄存器地址-读取数据
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @param {uint8_t} addr 器件地址(0x00~0x7f)
* @param {uint8_t} regAddr 寄存器地址(0x00~0xff)
* @param {uint8_t} amount 读取数据数量(0x00~0xff)
* @param {uint8_t*} data 返回数据指针
* @param {uint8_t} typ 数据指针类型（由于结构体和数组存储方式不一样，因此需要区分）
* ARRAY 数组
* STRUCT 结构体
* @return {*} FAILD 读取失败数据无效
* SUCCEED 读取成功数据有效
*/
uint8_t S_I2C_ReadRegister(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t amount, uint8_t* data, uint8_t typ)
{
S_I2C_Start(I2C_temp);
addr = (addr << 1) | 0x01;
if(S_I2C_SendByte(I2C_temp, addr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
if(S_I2C_SendByte(I2C_temp, regAddr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
for(amount -= 1;amount;amount --)
{
*data = S_I2C_ReceiveByte(I2C_temp, ACK);
if(typ == ARRAY)
data ++;
else
data --;
}
*data = S_I2C_ReceiveByte(I2C_temp, NACK);
S_I2C_Stop(I2C_temp);
return SUCCEED;
}
/**
* @description: 读取器件，读取格式：器件写-寄存器地址-器件读-读取数据
* @param {I2C_Struct} I2C_temp I2C_IO结构体
* @param {uint8_t} addr 器件地址(0x00~0x7f)
* @param {uint8_t} regAddr 寄存器地址(0x00~0xff)
* @param {uint8_t} amount 读取数据数量(0x00~0xff)
* @param {uint8_t*} data 返回数据指针
* @param {uint8_t} typ 数据指针类型（由于结构体和数组存储方式不一样，因此需要区分）
* ARRAY 数组
* STRUCT 结构体
* @return {uint8_t} FAILD 读取失败数据无效
* SUCCEED 读取成功数据有效
*/
uint8_t S_I2C_PointerRead(I2C_Struct I2C_temp, uint8_t addr, uint8_t regAddr, uint8_t amount, uint8_t* data, uint8_t typ)
{
addr <<= 1;
S_I2C_Start(I2C_temp);
if(S_I2C_SendByte(I2C_temp, addr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
if(S_I2C_SendByte(I2C_temp, regAddr) == NACK)
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
S_I2C_Stop(I2C_temp);
addr |= 0x01;
S_I2C_Start(I2C_temp);
if(S_I2C_SendByte(I2C_temp, addr) == NACK) //NACK
{
S_I2C_Stop(I2C_temp);
return FAILED;
}
for(amount -= 1;amount;amount --)
{
*data = S_I2C_ReceiveByte(I2C_temp, ACK);
if(typ == ARRAY)
data ++;
else
data --;
}
*data = S_I2C_ReceiveByte(I2C_temp, NACK);
S_I2C_Stop(I2C_temp);
return SUCCEED;
}

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使用方法

void main(void)
{
CLOCK_Init();
GPIO_Init();
S_I2C_Init();//初始化结构体，在宏定义中修改引脚等定义
//接下来就可以调用I2C函数了
}

复制代码

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