STM32F1 I2C（IIC）最简单的轮询读写EEPROM 库函数3.5

lgh1230306 2017-03-16 09:43:26

这几天刚开始搞STM32F103ZET6 的I2C，看完数据手册和一些视频教程（有原子的的和刘凯老师的），最后发现向我这种C都不怎么样的人来说抄袭他们的源代码就有点困难了，只能自己边参考边自己敲，所以直接就用51的思维做了个最简单的读写E2PROM程序，
第一天，参考别人的敲了1个多小时，开始仿真，发现再怎么样都调试不通（变量没有值），而且还容易死，然后开始各种找原因，
第二天，已经渐渐放弃了库函数操作，开始用寄存器吧，操作了一天，还是不成功（操作寄存器非常有好处，就是可以把所有库函数的意思都能搞明白是怎么回事），寄存器操作收获非常大，然后
第三天，又回归库函数操作，就在第一天的源代码上面加上串口打印，“坚决”不在线仿真，后来惊奇的串口打印出来了，有数据了。
后来分析失败的原因：
第一：在线仿真肯定是得不到数据的，首先我一步一步执行，I2C的读写时序要求非常高，超过时间就自动死，只能重新上电解决
第二：第一次写入数据后，想在写入的话，一定要加延时（也可以用定时器-中断，SYSTICK来解决这个延时时间），否则不成功，注意：不能在写入函数里面延时，而是在停止信号发生后才延时的哦，因为STM32自身配置的时钟非常准，发送期间根本不需要咱们去参与其中的；咱们刚写入的数据其实是写入到了E2PROM的缓冲区，还没等到它从缓冲区一个一个移位到具体存储空间时，咱们读或者写就会出错的，所以一定得 “延时”！！！

源代码贴上来，直用标准库例程，main.c的代码直接用下面的复制粘贴就可以了

/**
******************************************************************************
* @file Project/STM32F10x_StdPeriph_Template/main.c
* @author MCD Application Team
* @version V3.5.0
* @date 08-April-2011
* @brief Main program body
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#define STM32_CPU_I2C_OWNADR 0xB0
#define E2PROM_ADDR 0xA0

/******************************************************************************************************************************************************************/
void RCC_COF()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO|RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);

}
void USART1_GPIO_init()
{

GPIO_InitTypeDef USARTx_GPIO_InitStruct;

USART_InitTypeDef USARTx_InitStruct;

USARTx_GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
USARTx_GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 ;
USARTx_GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &USARTx_GPIO_InitStruct);

USARTx_GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
USARTx_GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10 ;
USARTx_GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &USARTx_GPIO_InitStruct);

USARTx_InitStruct.USART_BaudRate = 9600;
USARTx_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USARTx_InitStruct.USART_Mode = USART_Mode_Tx |USART_Mode_Rx ;
USARTx_InitStruct.USART_Parity = USART_Parity_No;
USARTx_InitStruct.USART_StopBits = USART_StopBits_1;
USARTx_InitStruct.USART_WordLength = USART_WordLength_8b;

USART_Init(USART1, &USARTx_InitStruct);

USART_Cmd(USART1, ENABLE);

}

/**************************************************************************************************************************************************/
void I2C2_GPIO_INIT()
{
I2C_InitTypeDef I2C2_InitStruct;
GPIO_InitTypeDef I2C2_GPIO_InitStruct;

I2C2_GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD ;
I2C2_GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10 |GPIO_Pin_11 ;
I2C2_GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz ;
GPIO_Init( GPIOB, &I2C2_GPIO_InitStruct);

I2C2_InitStruct.I2C_Ack = I2C_Ack_Enable ;
I2C2_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit ;
I2C2_InitStruct.I2C_ClockSpeed = 200000;
I2C2_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2 ;
I2C2_InitStruct.I2C_Mode = I2C_Mode_I2C ;
I2C2_InitStruct.I2C_OwnAddress1 = STM32_CPU_I2C_OWNADR ;
I2C_Init( I2C2, &I2C2_InitStruct);
I2C_Cmd( I2C2, ENABLE);

}

void I2C2_SENDDATA_24Cxx(u8 I2C2_SlaveAddress,uint8_t I2C2_Data_ADDR,uint8_t I2C2_Data)
{

I2C_GenerateSTART(I2C2, ENABLE);
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress( I2C2, I2C2_SlaveAddress , I2C_Direction_Transmitter);
while(!I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ));

I2C_SendData( I2C2, I2C2_Data_ADDR );
while(!I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_SendData( I2C2, I2C2_Data );
while(!I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_GenerateSTOP(I2C2, ENABLE);

}

uint8_t I2C2_RECIVEDATA24Cxx(u8 I2C2_SlaveAddress,uint8_t I2C2_Data_ADDR )
{
I2C_AcknowledgeConfig( I2C2, ENABLE);
I2C_GenerateSTART(I2C2, ENABLE);
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT)){;}

I2C_Send7bitAddress( I2C2, I2C2_SlaveAddress , I2C_Direction_Transmitter);
while(!I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED )){;}

I2C_SendData( I2C2, I2C2_Data_ADDR );

I2C_GenerateSTART(I2C2, ENABLE);
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT)){;}

I2C_Send7bitAddress( I2C2,I2C2_SlaveAddress , I2C_Direction_Receiver );
while(!I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED )){;}

I2C_AcknowledgeConfig( I2C2, DISABLE);
I2C_GenerateSTOP( I2C2, ENABLE);
while(!I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_BYTE_RECEIVED)){;}

return I2C_ReceiveData(I2C2);

}

void I2C_delay(unsigned int I2C_time)
{
while(I2C_time -- );
}

int main()
{
uint8_t E2PROM_data;

RCC_COF();
I2C2_GPIO_INIT();
USART1_GPIO_init();

USART_SendData(USART1,0xFF);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);

I2C_delay(50000);

I2C2_SENDDATA_24Cxx(0xA0,0x00,0x66); //写入数据
I2C_delay(50000); //切记：一定得延时
I2C2_SENDDATA_24Cxx(0xA0,0x01,0x77);
I2C_delay(50000);
I2C2_SENDDATA_24Cxx(0xA0,0x02,0x88);
I2C_delay(50000);
I2C2_SENDDATA_24Cxx(0xA0,0x03,0x99);
I2C_delay(50000);
I2C2_SENDDATA_24Cxx(0xA0,0xFF,0xAA);
I2C_delay(50000);

E2PROM_data = I2C2_RECIVEDATA24Cxx(E2PROM_ADDR,0x00); //读取数据

USART_SendData(USART1, E2PROM_data);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);
I2C_delay(50000); //延时
E2PROM_data = I2C2_RECIVEDATA24Cxx(E2PROM_ADDR,0x01);

USART_SendData(USART1, E2PROM_data);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);
I2C_delay(50000);
E2PROM_data = I2C2_RECIVEDATA24Cxx(E2PROM_ADDR,0x02);

USART_SendData(USART1, E2PROM_data);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);
I2C_delay(50000);
E2PROM_data = I2C2_RECIVEDATA24Cxx(E2PROM_ADDR,0x03);

USART_SendData(USART1, E2PROM_data);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);
I2C_delay(50000);
E2PROM_data = I2C2_RECIVEDATA24Cxx(E2PROM_ADDR,0xFF);

USART_SendData(USART1, E2PROM_data);
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
while(!USART_GetFlagStatus(USART1, USART_FLAG_TC));
USART_ClearFlag(USART1, USART_FLAG_TC);

I2C_delay(50000);

while(1)
{

}
}

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