【开发学院第三期】相关硬件技术资料贴

wet999

xiexiexiexiexiexie

shuixingoo

good

安

I2C时序操作函数
#include "support_common.h" /* include peripheral declarations and more */
#include "i2c_driver.h"
void init_i2c()
{
    unsigned char temp;
   
    MCF_GPIO_PASPAR  |=MCF_GPIO_PASPAR_SCL0_SCL0 |MCF_GPIO_PASPAR_SDA0_SDA0 ;
    MCF_I2C_I2FDR(0)=MCF_I2C_I2FDR_IC(0x3A);//about 100khz
    MCF_I2C_I2ADR(0)=0xf0;
    MCF_I2C_I2CR(0)=0x80;//enable i2c

    if(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IBB)
    {
        MCF_I2C_I2CR(0)=0x0;
        MCF_I2C_I2CR(0)=MCF_I2C_I2CR_IEN |      /* enable module */
                       MCF_I2C_I2CR_MSTA;
        temp=MCF_I2C_I2DR(0);
        MCF_I2C_I2SR(0)=0;
        MCF_I2C_I2CR(0)=0x0;
        MCF_I2C_I2CR(0)=0x80;//enable i2c
    }
}
void i2c_start()
{
    while(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IBB);
    MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MTX ;
    MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MSTA ; 
}

unsigned char i2c_send_byte(unsigned char c)
{

    MCF_I2C_I2DR(0)=c;
    while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
    {
     
    }
    MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
    if(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_RXAK) 
        return 1;//failed
    else
        return 0;//success
}

unsigned char i2c_recv_byte(unsigned char ack)
{
    unsigned char temp;
    if(ack>0)
    {
        MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_TXAK; 
    }
    else
    {
        MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_TXAK;  
    }
   
    MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_MTX ;
    temp=MCF_I2C_I2DR(0); 
    while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
    {
     
    }
    MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
    temp= MCF_I2C_I2DR(0);
    while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
    {
     
    }
    MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
    return temp;
}
void i2c_stop()
{
    MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_MSTA ; 
}
void i2c_restart()
{
    MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_RSTA;
}

安

AT24C02读取写入函数

#include "i2c_driver.h"
#include "at24c02.h"
#include "delay.h"
/* write 24xxxx I2C EEPROM
* 参数:
* buf---包含待写入数据的缓冲区
* addr---eeprom起始地址
* num--数据长度
* 返回:
* 0---success
* 1---failed
* 2---invalid address
*/
unsigned char at24c02_write(unsigned char *buf,unsigned char num,uint8 addr)
{
    unsigned char i,ret;
   
    if(addr+num>EEPROM_MAX_ADDR)
        return 2;
   
    i2c_start();
    ret=i2c_send_byte(WR24C02);
    if(ret)
    {
        i2c_stop();
        return 1;
    }
   
    ret=i2c_send_byte(addr);
    if(ret)
    {
        i2c_stop();
        return 1;
    }
    for(i=0;iEEPROM_MAX_ADDR)
        return 2;
   
    i2c_start();
    if(i2c_send_byte(WR24C02))
    {
        i2c_stop();
        return 1;
    }
    ret=i2c_send_byte(addr);
    if(ret)
    {
        i2c_stop();
        return 1;
    }

    i2c_restart();
    if(i2c_send_byte(RD24C02))
    {
        i2c_stop();
        return 1;
    }
   
    for(i=0;i

whp394557

:【开发学院第三期】相关硬件技术资料贴kankan

sunft0801

wo也看看！！！

hbthgs

顶楼主，谢谢分享

zhaolifei

分享是一种美德，谢谢~

风向图

顶楼主，谢谢分享