F407硬件IIC读写24C256

车前子 · 发表于 2020-9-12 09:52:10

总感觉模拟IIC总线读写24C256有点浪费时间，然后就想弄个硬件IIC来读写24C256，可是呢，直接操作寄存器总是不成功，最终还是弄的库。这个是参考了网友的程序改的，网名忘记叫啥了，真是惭愧。感谢硬汉对开源的无私奉献，本人才学疏浅搞不了原创，就把网友的程序改动了少许来献丑啦。

/**
*****************************************************************************
*
* @文件名: iic.c
* @版本: V1.0
* @日期: 2020-7-1
* @作者: 振德
* @备注:
*****************************************************************************
**/
#include "IIC.h"
/******************************************************************************
* 硬件IIC初始化
*/
void IIC_Init(I2C_TypeDef* IICx, uint08 SlaveAdd)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
GPIOD->MODER &= ~GPIO_MODER_MODER3; /*00:输入；01:通用输出；10:复用输出；11:模拟输入*/
GPIOD->MODER |= GPIO_MODER_MODER3_0;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = SlaveAdd; //从设备地址
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = (100 * 1000); //SCL最大100KHz
I2C_Cmd(IICx, ENABLE);
I2C_Init(IICx, &I2C_InitStructure);
I2C_AcknowledgeConfig(IICx, ENABLE);
IICx->CR1 |= 1u << 7;/*禁止时钟延长*/
}
/*******************************************************************************
* 硬件IIC等待从设备内部操作完成
*/
void IICWaiteStandby(I2C_TypeDef* IICx, uint08 SlaveAdd)
{
u16 tmp = 0;
TestValues.BootRunTime = 0;
IICx->SR1 &= 0x0000;/*清除状态寄存器1*/
tmp = tmp;
do {
TestValues.BootRunTime ++;
I2C_GenerateSTART(IICx, ENABLE);/*产生起始信号*/
tmp = IICx->SR1;/*读取SR1寄存器，然后通过写入数据寄存器来清除SB位*/
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);/*发送从设备地址*/
if (TestValues.BootRunTime > 1680000)
break;
}
while ((IICx->SR1 & 0x0002) == 0x0000);/*当ADDR = 1时，表明应答了，退出循环*/
I2C_ClearFlag(IICx, I2C_FLAG_AF); /*清除应答失败标志位*/
I2C_GenerateSTOP(IICx, ENABLE); /*发送停止信号*/
}
/*******************************************************************************
* @功能: 硬件IIC发送一个字节数据
* @输入: I2Cx: IIC组
* SlaveAdd:从设备时识别地址
* WriteAdd: 写入EEPROM内存地址
* Data: 写入的数据
* @返回: *err: 返回的错误值
*/
void IICWriteOneByte(I2C_TypeDef* IICx, uint08 SlaveAdd, uint08 WriteAdd, uint08 Data, uint08 * err)
{
u16 temp = 0;
while (I2C_GetFlagStatus(IICx, I2C_FLAG_BUSY))/*等待IIC*/
{
temp++;
if (temp > 800)
{
*err |= 1<<0;
I2C_GenerateSTOP(IICx, ENABLE);/*产生停止信号*/
return;
}
}
I2C_GenerateSTART(IICx, ENABLE);/*产生起始信号*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT))
{
temp++;
if (temp > 800)
{
*err |= 1<<1;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);/*发送设备地址*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){
temp++;
if (temp > 1000){
*err |= 1<<2;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
temp = IICx->SR2;/*读取SR1寄存器后,对SR2寄存器的读操作将清除ADDR位*/
I2C_SendData(IICx, WriteAdd);/*发送存储地址*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){
temp++;
if (temp > 800) {
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_SendData(IICx, Data);/*发送数据*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
temp++;
if (temp > 800)
{
*err |= 1<<4;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_GenerateSTOP(IICx, ENABLE);
}
/*****************************************************************************
* @功能: 硬件IIC读取一个字节数据
* @输入: I2Cx: IIC组
* SlaveAdd: 作为从设备时识别地址
* ReadAdd: 读取的EEPROM内存地址
* @返回: *err: 返回的错误值
* 读取到的数据
*/
uint08 IIC_ReadOneByte(I2C_TypeDef* IICx, uint08 SlaveAdd, uint08 ReadAdd, uint08 * err)
{
vuint16 i = 0;
vuint08 temp = 0;
vuint16 flag = 0;
while (I2C_GetFlagStatus(IICx, I2C_FLAG_BUSY)){
i++;
if (i > 800){
*err |= 1<<0;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
I2C_GenerateSTART(IICx, ENABLE);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT)){
i++;
if (i > 1000){
*err |= 1<<1;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){
if (i > 1000){
*err |= 1<<2;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
flag = IICx->SR2;
I2C_SendData(IICx, ReadAdd);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){
i++;
if (i > 2000){
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
I2C_GenerateSTART(IICx, ENABLE);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT)){
i++;
if (i > 800){
*err |= 1<<4;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Receiver);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){//EV6
i++;
if (i > 800){
*err |= 1<<5;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
flag = IICx->SR2;
I2C_AcknowledgeConfig(IICx, DISABLE);/*发送NACK*/
I2C_GenerateSTOP(IICx, ENABLE);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_RECEIVED)){
i++;
if (i > 1000){
*err |= 1<<6;
I2C_GenerateSTOP(IICx, ENABLE);
return 0;
}
}
temp = I2C_ReceiveData(IICx);
I2C_AcknowledgeConfig(IICx, ENABLE);
return temp;
}
/*****************************************************************************
* @功能: 硬件IIC发送多个字节数据
* @输入: I2Cx: IIC组
* SlaveAdd: 作为从设备时识别地址
* WriteAdd: 写入EEPROM内存起始地址
* NumToWrite: 写入数据量
* *pBuffer: 写入的数据组缓存
* @输出: *err: 返回的错误值
*/
void IIC_WriteNByte(I2C_TypeDef * IICx, uint08 SlaveAdd, uint16 WriteAdd, uint08 NumToWrite, uint08 * pBuffer, u8 * err)
{
vuint16 temp = 0;
vuint16 Addr = WriteAdd;
while (I2C_GetFlagStatus(IICx, I2C_FLAG_BUSY)){
temp++;
if (temp > 1000) {
*err |= 1<<0;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_GenerateSTART(IICx, ENABLE);
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT))
{
temp++;
if (temp > 1000) {
*err |= 1<<1;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){
temp++;
if (temp > 1000){
*err |= 1<<2;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
temp = IICx->SR2;
// if (Addr & 0xff00){
I2C_SendData(IICx, (uint08)(Addr >> 8)); /*发送存储高8位地址*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){//EV8
temp++;
if (temp > 1000){
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
//}
I2C_SendData(IICx, (Addr & 0x00ff)); /*发送存储低8位地址*/
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){//EV8
temp++;
if (temp > 1000){
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
while (NumToWrite--){
I2C_SendData(IICx, *pBuffer); /*发送数据*/
pBuffer++;
temp = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTED)){
temp++;
if (temp > 1000){
*err |= 1<<4;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
}
I2C_GenerateSTOP(IICx, ENABLE);
}
/******************************************************************************
* @功能: 硬件IIC读取多个字节数据
* @输入: I2Cx: IIC组
* SlaveAdd: 作为从设备时识别地址
* ReadAdd: 读取的EEPROM内存起始地址
* NumToRead: 读取数量
* @输出: *pBuffer: 数据输出缓冲区
**/
void IIC_PageRead(I2C_TypeDef* IICx, uint08 SlaveAdd, uint16 ReadAdd, uint08 NumToRead, uint08 * pBuffer, uint08 * err)
{
vuint16 i = 0;
vuint16 temp = 0;
vuint16 Addr = ReadAdd;
while (I2C_GetFlagStatus(IICx, I2C_FLAG_BUSY)){
i++;
if (i > 1000){
*err |= 1<<0;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_GenerateSTART(IICx, ENABLE);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT)){
i++;
if (i > 800){
*err |= 1<<1;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Transmitter);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)){
i++;
if (i > 1000){
*err |= 1<<2;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
i = IICx->SR2;
// if (Addr & 0xff00){
I2C_SendData(IICx, (uint08)(Addr >> 8)); /*发送存储高8位地址*/
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){//EV8
i++;
if (i > 2000){
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE); /*出错，产生停止信号*/
return;
}
}
// }
I2C_SendData(IICx, (uint08)(Addr & 0x00ff)); /*发送存储低8位地址*/
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_TRANSMITTING)){//EV8
i++;
if (i > 2000){
*err |= 1<<3;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_GenerateSTART(IICx, ENABLE);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_MODE_SELECT)){//EV5
i++;
if (i > 800){
*err |= 1<<4;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
I2C_Send7bitAddress(IICx, SlaveAdd, I2C_Direction_Receiver);
i = 0;
while (!I2C_CheckEvent(IICx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)){
i++;
if (i > 800)
{
*err |= 1<<5;
I2C_GenerateSTOP(IICx, ENABLE);
return;
}
}
i = IICx->SR2;
while (NumToRead){/*批量接收数据*/
if (NumToRead == 1){ /*最后一个数据了，不发送应答信号*/
I2C_AcknowledgeConfig(IICx, DISABLE); /*发送NACK*/
I2C_GenerateSTOP(IICx, ENABLE);
}
if (I2C_CheckEvent(IICx, I2C_EVENT_MASTER_BYTE_RECEIVED)){
*pBuffer = I2C_ReceiveData(IICx);
pBuffer++;
NumToRead--;
}
}
I2C_AcknowledgeConfig(IICx, ENABLE);
}
/*****************************************************************************
* @功能: AT24Cxx页写函数
*
* @输入: I2Cx: IIC组
* SlaveAdd: 从设备地址
* WriteAdd: 写入EEPROM内存起始地址
* NumToWrite: 写入数据量
* *pBuffer: 写入的数据组缓存
*
*/
void IIC_PageWrite(I2C_TypeDef * IICx, uint08 SlaveAdd, uint16 WriteAdd, uint08 NumToWrite, uint08 * pBuffer, uint08 * err)
{
vuint16 Num_Page = 0; /*按照页大小需要写入的次数*/
vuint16 Num_Remain = 0; /*页写剩余字节数*/
vuint16 Addr = 0; /*数据块首地址为EEPROM页数整数倍*/
vuint16 cnt = 0;
wp_BL24Cxx = 0;
Addr = WriteAdd % AT24Cxx_PageSize; /*计算数据块首地址是否是页大小的整数倍*/
cnt = AT24Cxx_PageSize - Addr;
Num_Page = NumToWrite / AT24Cxx_PageSize; /*得到次数*/
Num_Remain = NumToWrite % AT24Cxx_PageSize; /*剩余字节数*/
if (Addr == 0){ /*是整数倍*/
if (Num_Page == 0){ *
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, Num_Remain, pBuffer, err); /*小于一个页大小数据*/
IICWaiteStandby(IICx, SlaveAdd); //等待操作完成
}
else{ /*大于一页数据*/
while (Num_Page--){ /*按照页来写*/
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, AT24Cxx_PageSize, pBuffer, err);
IICWaiteStandby(IICx, SlaveAdd);
WriteAdd += AT24Cxx_PageSize;
pBuffer += AT24Cxx_PageSize;
}
if (Num_Remain != 0){ /*不够一个页的数据*/
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, Num_Remain, pBuffer, err);
IICWaiteStandby(IICx, SlaveAdd);
}
}
}
else { /*不是整数倍*/
if (Num_Page == 0){
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, Num_Remain, pBuffer, err); /*写入小于一个页的数据量*/
IICWaiteStandby(IICx, SlaveAdd);
}
else {
NumToWrite -= cnt;
Num_Page = NumToWrite / AT24Cxx_PageSize;
Num_Remain = NumToWrite % AT24Cxx_PageSize;
if (cnt != 0){
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, cnt, pBuffer, err);
IICWaiteStandby(IICx, SlaveAdd);
WriteAdd += cnt;
pBuffer += cnt;
}
while (Num_Page--) { /*按照页来写*/
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, AT24Cxx_PageSize, pBuffer, err);
IICWaiteStandby(IICx, SlaveAdd);
WriteAdd += AT24Cxx_PageSize;
pBuffer += AT24Cxx_PageSize;
}
if (Num_Remain != 0) {
IIC_WriteNByte(IICx, SlaveAdd, WriteAdd, Num_Remain, pBuffer, err); /*小于一个页大小数据*/
IICWaiteStandby(IICx, SlaveAdd);
}
}
}
wp_BL24Cxx = 1;
}
/*****************************************************************************
* @功能: 确定系统是否有AT24Cxx
* @输入: I2Cx: IIC组
*
* @返回: 1：检测到AT24Cxx，0：没有检测到AT24Cxx
*/
uint08 AT24CXX_Check(I2C_TypeDef * IICx)
{
vuint08 temp;
vuint08 i;
temp = IIC_ReadOneByte(IICx ,BL2408Add, 0,&i);
if(temp == 0x55){
return 1;
}
else {
wp_BL24Cxx = 0;
IICWriteOneByte(IICx ,BL2408Add, 0,0x55,&i);
temp = IIC_ReadOneByte(IICx ,BL2408Add, 0,&i);
wp_BL24Cxx = 1;
if(temp == 0x55)return 1;
}
return 0;
}