用一个数组（buffer）模拟寄存器进行IIC读写，STM32F10X 做从机实现硬件IIC I2C

在网上找了半天，大部分人都是用两个数组，一个TxBuffer，一个RxBuffer。为什么没有人用一个数组呢？？？？
本文用一个数组实现模拟寄存器进行IIC读写，STM32F10X 做从机实现硬件IIC。**
编辑器用的Keil5。mian.c就不发出来了就常见的各种初始化。前边常用的IIC配置网上都有，主要是中断做了修改。****

#include "myiic.h"
#include "delay.h"
#include "led.h"
#include "key.h"
#include "usart.h"
#define I2C_ADDR    0x03 //自己定义一个自己喜欢的

 uint8_t data = 0;
uint8_t rx_count = 0;
 int c=0;
 u8 flag=0;
 uint8_t  Buffer_Rx_IIC1[256]={0x2b};//接收缓存
 uint8_t  Buffer_Tx_IIC1[256]={0x3a};//接收缓存
 uint8_t  Rx_Idx_IIC1=0;//接收计数
 uint8_t  Tx_Idx_IIC1=0;//发送计数
void I2C1_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	I2C_InitTypeDef I2C_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	I2C_DeInit(I2C1);   
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//I2C必须开漏输出，实现线与逻辑
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	// configure I2C1 
	I2C_InitStructure.I2C_ClockSpeed = 400000;
	I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
	I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
	I2C_InitStructure.I2C_OwnAddress1 = I2C_ADDR;
	I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
	I2C_InitStructure.I2C_AcknowledgedAddress= I2C_AcknowledgedAddress_7bit;
	I2C_Init(I2C1, &I2C_InitStructure);
		NVIC_InitStructure.NVIC_IRQChannel                   = I2C1_EV_IRQn;
		NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
		NVIC_InitStructure.NVIC_IRQChannelSubPriority        = 0;
		NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
		NVIC_Init(&NVIC_InitStructure);
  

    NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;//错误中断
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                 
    NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
    NVIC_Init(&NVIC_InitStructure);


	// enable I2C1
		I2C_ITConfig(I2C1, I2C_IT_ERR | I2C_IT_EVT | I2C_IT_BUF, ENABLE);
	  I2C_Cmd(I2C1, ENABLE);
}

void I2C1_EV_IRQHandler(void)
{

  __IO uint32_t SR1Register =0;
  __IO uint32_t SR2Register =0;

  SR1Register = I2C1->SR1;
  SR2Register = I2C1->SR2;

    /* I2C1是从机(MSL = 0) */
  if((SR2Register &0x0001) != 0x0001)
  {
    /* 主机已发送地址，地址为被置位·(ADDR = 1: EV1(包括发送和接收)) */
    if((SR1Register & 0x0002) == 0x0002)
		{
				/* 清除标志位 */
				SR1Register = 0;
				SR2Register = 0;
				Rx_Idx_IIC1=0;
				Tx_Idx_IIC1=0;
		}

    /* 接收数据(RXNE = 1: EV2) *///这里是重中之重。
    if((SR1Register & 0x0040) == 0x0040)
    {    flag+=1;
			    Buffer_Rx_IIC1[Rx_Idx_IIC1++]= I2C1->DR;
			    data=Buffer_Rx_IIC1[--Rx_Idx_IIC1]
					if (flag>=2)//
					{
						uint8_t index=Buffer_Rx_IIC1[0];
						Buffer_Tx_IIC1[index]=data;
	
					}
					 

			
						SR1Register = 0;
						SR2Register = 0;
		}
    /* 检测到停止条件(STOPF =1: EV4) */
			if((SR1Register & 0x0010) == 0x0010)
			{   flag=0;
					I2C1->CR1 |= 0x0001;
					SR1Register = 0;
					SR2Register = 0;
					Rx_Idx_IIC1=0;		
					Tx_Idx_IIC1=0;				
			}
			/* 发送数据(TxE = 1: EV3、EV3-1) */
					if((SR1Register & 0x0080) == 0x0080)
					{   int i;
							flag=0;
							
							I2C1->DR = Buffer_Tx_IIC1[data];
							SR1Register = 0;
							SR2Register = 0;
					 }
			/* 检测到非应答(AF =1: EV3-2) */
					if(( SR1Register & 0x0400) == 0x0400)
					{
							I2C1->SR1 &= 0xFDFF;
							SR1Register = 0;
							SR2Register = 0;        
					}       
  }
 }

void I2C1_ER_IRQHandler(void) 
{
  __IO uint32_t SR1Register =0;
  __IO uint32_t SR2Register =0;
  SR1Register = I2C1->SR1;
  SR2Register = I2C1->SR2;
    if(I2C_GetITStatus(I2C1,        I2C_IT_SMBALERT)) {
    }
    else if(I2C_GetITStatus(I2C1, I2C_IT_TIMEOUT)) {
    } 
    else if(I2C_GetITStatus(I2C1, I2C_IT_PECERR)) {
    } 
    else if(I2C_GetITStatus(I2C1, I2C_IT_OVR)) {

    }
    else if(I2C_GetITStatus(I2C1, I2C_IT_AF)) {

        I2C_ClearITPendingBit(I2C1, I2C_IT_AF);
    }
    else if(I2C_GetITStatus(I2C1, I2C_IT_ARLO)) {

    }
    else if(I2C_GetITStatus(I2C1, I2C_IT_BERR)) {

    }
		
        I2C1->CR1 |= 0x0001;
        SR1Register = 0;
        SR2Register = 0;    
}

硬件IIC看起来似乎很麻烦，但是按照官方的时序走很简单。

这里贴出来官方手册的从机接收和发送时序。


好了，第一篇博客到此结束，有问题留言哦！！

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