#include "eeprom.h"
#include "math.h"
#include "stm32f10x.h"
#include "time.h"
#include"hcpu.h"
void IIC_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA , ENABLE);
// IIC端口定义
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIO_SetBits(GPIOA,GPIO_Pin_9|GPIO_Pin_10);
//写保护引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void SDA_OUT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
delay_us(10);
}
void SDA_IN(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
delay_us(10);
}
//产生IIC起始信号
void IIC_Start(void)
{
SDA_OUT(); //sda线输出
IIC_SDA_H;
IIC_SCL_H;
delay_us(4);
IIC_SDA_L;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC_SCL_L;//钳住I2C总线,准备发送或接收数据
}
//产生IIC停止信号
void IIC_Stop(void)
{
SDA_OUT();//sda线输出
IIC_SCL_L;
IIC_SDA_L;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL_H;
IIC_SDA_H;//发送I2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值:1,接收应答失败
// 0,接收应答成功
u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SDA_H;delay_us(1);
IIC_SCL_H;delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL_L;//时钟输出0
return 0;
}
//产生ACK应答
void IIC_Ack(void)
{
IIC_SCL_L;
SDA_OUT();
IIC_SDA_L;
delay_us(2);
IIC_SCL_H;
delay_us(2);
IIC_SCL_L;
}
//不产生ACK应答
void IIC_NAck(void)
{
IIC_SCL_L;
SDA_OUT();
IIC_SDA_H;
delay_us(2);
IIC_SCL_H;
delay_us(2);
IIC_SCL_L;
}
//IIC发送一个字节
//返回从机有无应答
//1,有应答
//0,无应答
void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL_L;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
IIC_SDA_H;
else
IIC_SDA_L;
txd<<=1;
delay_us(2); //对TEA5767这三个延时都是必须的
IIC_SCL_H;
delay_us(2);
IIC_SCL_L;
delay_us(2);
}
}
//读1个字节,ack=1时,发送ACK,ack=0,发送nACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char n,receive=0;
SDA_IN();//SDA设置为输入
for(n=0;n<8;n++ )
{
IIC_SCL_L;
delay_us(2);
IIC_SCL_H;
receive<<=1;
if(READ_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC_NAck();//发送nACK
else
IIC_Ack(); //发送ACK
return receive;
}
u8 IIC_ReadOneByte(u16 ReadAddr)
{
u8 temp=0;
IIC_Start();
IIC_Send_Byte(0XA0); //发送写命令
IIC_Wait_Ack();
IIC_Send_Byte(ReadAddr>>8);//发送高地址
IIC_Wait_Ack();
IIC_Send_Byte(ReadAddr&0xff); //发送低地址
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(0XA1); //进入接收模式
IIC_Wait_Ack();
temp=IIC_Read_Byte(0);
IIC_Stop();//产生一个停止条件
return temp;
}
//在AT24CXX指定地址写入一个数据
//WriteAddr :写入数据的目的地址
//DataToWrite:要写入的数据
void IIC_WriteOneByte(u16 WriteAddr,u8 DataToWrite)
{
IIC_Start();
IIC_Send_Byte(0XA0); //发送写命令
IIC_Wait_Ack();
IIC_Send_Byte(WriteAddr>>8);//发送高地址
IIC_Wait_Ack();
IIC_Send_Byte(WriteAddr&0xff); //发送低地址
IIC_Wait_Ack();
IIC_Send_Byte(DataToWrite); //发送字节
IIC_Wait_Ack();
IIC_Stop();//产生一个停止条件
}
void IIC_EE_BufferWrite(u16 WriteAddr,u16 WriteData,u8 Len)
{
u8 m;
IIC_WP_L;
delay_us(4);
for (m=0;m<Len;m++)
{
IIC_WriteOneByte(WriteAddr+m,(WriteData>>(8*m))&0xff);
}
IIC_WP_H;
}
u16 IIC_EE_BufferRead(u16 ReadAddr,u8 Len)
{
u8 k;
u16 ReadData=0;
for (k=0;k<Len;k++)
{
ReadData<<=8;
ReadData+= IIC_ReadOneByte(ReadAddr+Len-k-1);
}
return ReadData;
}