【菜鸟入门】stm32 之 eeprom

/* at24c02.c */
#include <stm32f10x.h>
#include "init.h"
#include "iic.h"

#define send_slave_addr(a)	iic_send_byte(a)
#define send_rom_addr(a)		iic_send_byte(a)
#define ROM_SIZE		(2*1024)			//2K
#define ADDR_SIZE		256
#define PAGE_SIZE		8
#define PAGE				32

int at24c02_init(unsigned char slave_addr)
{
	iic_init();
	iic_start();
	send_slave_addr(slave_addr|IIC_WRITE);
	if(iic_recv_ack())
		return 0;
	else
		return 1;
}
int set_rom_addr(unsigned addr)
{
	send_rom_addr(addr);
	if(iic_recv_ack())
		return 0;
	else
		return 1;
}
int at24c02_write_unpage(	unsigned char slave_addr,
													unsigned char start_addr,
													char buff[],
													unsigned char size)
{
		delay_ms(1);
	if(0 == at24c02_init(slave_addr))
		return -1;
	if(0 == set_rom_addr(start_addr))
		return -1;
	if(size > iic_send_str(buff,size))
	{
			iic_stop();
			return 0;
	}
  else 
	{
			iic_stop();
			return 1;
	}
}
int at24c02_write_page(unsigned char slave_addr,
											 unsigned char start_addr,
											 char buff[])
{
	delay_ms(1);
	if(0 == at24c02_init(slave_addr))
		return -1;
	if(0 == set_rom_addr(start_addr))
		return -1;
	if(8 > iic_send_str(buff,8))
	{
			iic_stop();
			return 0;
	}
  else 
	{
			iic_stop();
			return 1;
	}
}
int at24c02_write(unsigned char slave_addr,
									unsigned char start_addr,
									char buff[],
									unsigned char size)
{
	unsigned char addr = 0;
	unsigned char send_byte;
	unsigned char i;
	char temp;
	addr = 8 + ((unsigned char)(start_addr/8))*8;//Get Next Page Frist Address
	send_byte = addr - start_addr;
	if(size <= send_byte)
	{
		if(-1 == at24c02_write_unpage(slave_addr,start_addr,buff,size))
			return -1;
		else
			return 0;
	}
	else
	{
		if(-1 == at24c02_write_unpage(slave_addr,start_addr,buff,send_byte))
			return -1;
	}
	size -= send_byte;
	buff += send_byte;
	delay_ms(5);
	temp = (char)(size/8);
	for(i=0; i<temp;i++)
	{
		start_addr = addr;
		if(-1 == at24c02_write_page(slave_addr,start_addr,buff))
			return -1;
		addr += 8;
		size -= 8;
		buff += 8;
		delay_ms(5);
	}
	start_addr = addr;
	if(-1 == at24c02_write_unpage(slave_addr,start_addr,buff,size))
			return -1;
	return 0;
}
int at24c02_read( unsigned char slave_addr,
									unsigned char start_addr,
									char buff[],
									unsigned char size)
{
	delay_ms(1);
	if(0 == at24c02_init(slave_addr))
		return -1;
	if(0 == set_rom_addr(start_addr))
		return -1;
	iic_start();
	send_slave_addr(slave_addr|IIC_READ);
	if(iic_recv_ack())
		return -1;
	iic_recv_str(buff,size);
	iic_stop();
	return size;
}

int main()
{
	char str[512];
	int length = 0;
	sys_init(9);
	rs232_init(CPU_72M,9600);
	rs232_send_byte('\n');
	
	if(-1 == at24c02_write(SL***E_ADDR,6,__NOTE,strlen(__NOTE)))
		rs232_send_str("Write AT24C02 Fail!\n",20);
	delay_ms(1000);
	if(-1 == (length = at24c02_read(SL***E_ADDR,0,str,64)))
		rs232_send_str("Read  AT24C02 Fail!\n",20);
	
	rs232_send_str("Read:",strlen("Read:"));
	rs232_send_str(str,strlen(str));
	
	return 0;
}