24c512.c

通过车载终端采集GPS数据

#include "i2c.h"

#define READ_CONFIG     0xA1
#define WRITE_CONFIG    0xA0
/**************************************
*配置程序的E2改为128K
***************************************/
/*前64K字节*/
#define READ_FIRMWARE_FRONT64K 0xA5
#define WRITE_FIRMWARE_FRONT64K 0xA4
/*后64K字节*/
#define READ_FIRMWARE_BACK64K 0xA7
#define WRITE_FIRMWARE_BACK64K 0xA6

void c512_config_write(unsigned int addr, char *ptr, unsigned char len)
{
    unsigned char tmp;
    unsigned char i;
    char *tmpPtr;

    i2c_wp(0);

    i2c_start();
    i2c_writeByte(WRITE_CONFIG);
    i2c_get_ack();

    tmp = addr>>8;
    i2c_writeByte(tmp);     /*send high address*/
    i2c_get_ack();

    tmp = addr;
    i2c_writeByte(tmp);     /*send low address*/
    i2c_get_ack();													  

    tmpPtr = ptr;
    for(i=0; i<len; i++)
    {
        tmp = *tmpPtr ++;
        
        i2c_writeByte(tmp);
        i2c_get_ack();
    }

    i2c_stop();

    i2c_wp(1);
}

void c512_config_read(unsigned int addr, char *ptr, unsigned char len)
{
    unsigned char tmp;
    unsigned char i;
    char *tmpPtr;

    i2c_wp(1);

    i2c_start();    
    i2c_writeByte(WRITE_CONFIG);   
    i2c_get_ack();

    tmp = addr>>8;
    i2c_writeByte(tmp);     /*send high address*/
    i2c_get_ack();

    tmp = addr;
    i2c_writeByte(tmp);     /*send low address*/
    i2c_get_ack();

    i2c_start();
    i2c_writeByte(READ_CONFIG);
    i2c_get_ack();

    tmpPtr = ptr;
    for(i=0; i<len; i++)
    {
        tmp = i2c_readByte();
        *tmpPtr ++ = tmp;

        if( i != (len-1) )
            i2c_send_ack();

    }

    i2c_stop();
}

/****************************************************
*flag:0 前64K，1 后64K//in
****************************************************/
void c512_firmware_write(unsigned char flag, unsigned int addr, char *ptr, unsigned char len)
{
    unsigned char tmp;
    unsigned char i;
    char *tmpPtr;

    i2c_wp(0);

    i2c_start();
    if (0 == flag)
        i2c_writeByte(WRITE_FIRMWARE_FRONT64K);
    else
        i2c_writeByte(WRITE_FIRMWARE_BACK64K);
    i2c_get_ack();

    tmp = addr>>8;
    i2c_writeByte(tmp);     /*send high address*/
    i2c_get_ack();

    tmp = addr;
    i2c_writeByte(tmp);     /*send low address*/
    i2c_get_ack();

    tmpPtr = ptr;
    for(i=0; i<len; i++)
    {
        tmp = *tmpPtr ++;
        
        i2c_writeByte(tmp);
        i2c_get_ack();
    }

    i2c_stop();

    i2c_wp(1);
}

void c512_firmware_read(unsigned char flag, unsigned int addr, char *ptr, unsigned char len)
{
    unsigned char tmp;
    unsigned char i;
    char *tmpPtr;

    i2c_wp(1);

    i2c_start();    
    if (0 == flag)
        i2c_writeByte(WRITE_FIRMWARE_FRONT64K);
    else
        i2c_writeByte(WRITE_FIRMWARE_BACK64K);   
    i2c_get_ack();

    tmp = addr>>8;
    i2c_writeByte(tmp);     /*send high address*/
    i2c_get_ack();

    tmp = addr;
    i2c_writeByte(tmp);     /*send low address*/
    i2c_get_ack();

    i2c_start();
    if (0 == flag)
        i2c_writeByte(READ_FIRMWARE_FRONT64K);
    else
        i2c_writeByte(READ_FIRMWARE_BACK64K);
    i2c_get_ack();

    tmpPtr = ptr;
    for(i=0; i<len; i++)
    {
        tmp = i2c_readByte();
        *tmpPtr ++ = tmp;

        if( i != (len-1) )
            i2c_send_ack();

    }

    i2c_stop();
}