#include "i2c.h"
#include "AT24CXX.h"

void AT24CXX_Init(void)
{
	gd32_i2c_init(0, 100*1000);//here, need 120K min speed, may be the GD lib is something wrong!!!!
}


void AT24CXX_DeInit(void){
	gd32_i2c_deinit(0);
}

uint8_t AT24CXX_ReadOneByte(uint16_t ReadAddr)
{
	uint8_t value = 0;
	uint8_t device_addr = 0xA0 | ((ReadAddr >>8) << 1);
	int try_count = 100;
	while(0 >= gd32_i2c_read_byte(0, device_addr, (uint8_t)(ReadAddr&0xFF), (uint8_t *)&value)){
		if (try_count-- <= 0){
			break;
		}
	};
	return value;
}

void AT24CXX_WriteOneByte(uint16_t WriteAddr,uint8_t DataToWrite)
{	
	uint8_t device_addr = 0xA0 | ((WriteAddr >>8) << 1);
	int try_count = 100;
	while(0 >= gd32_i2c_write_byte(0, device_addr, (uint8_t)(WriteAddr & 0xFF), (uint8_t)DataToWrite)){
		if (try_count-- <= 0){
			break;
		}

	};
	
}

int AT24CXX_Read(uint16_t ReadAddr,uint8_t *pBuffer,uint16_t NumToRead)
{
	uint8_t device_addr = 0xA0 | ((ReadAddr >>8) << 1);
	int try_count = 100;
	while(0 >= gd32_i2c_read_nbytes(0, device_addr, (uint8_t)(ReadAddr&0xFF), pBuffer, NumToRead)){
		if (try_count-- <= 0){
			return -1;
		}
	};
	return NumToRead;
}  

/* use page write to improve write time */
static int AT24CXX_Write_Pages(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite){
	uint8_t device_addr = 0xA0 | ((WriteAddr >>8) << 1);
	int try_count = 100;
	while(0 >= gd32_i2c_write_nbytes(0, device_addr, (uint8_t)(WriteAddr&0xFF), pBuffer, NumToWrite)){
		if (try_count-- <= 0){
			return -1;
		}

	};
	return 0;
}
int AT24CXX_Write(uint16_t WriteAddr,uint8_t *pBuffer,uint16_t NumToWrite){
	uint16_t remain_len = NumToWrite;
	while(remain_len > 0){
		uint16_t w_len = (remain_len > PAGE_SIZE)?PAGE_SIZE:remain_len;
		if (AT24CXX_Write_Pages(WriteAddr, pBuffer, w_len) < 0){
			return -1;
		}
		WriteAddr += w_len;
		pBuffer += w_len;
		remain_len -= w_len;
	}
	return NumToWrite;
}

#if 0

#define ADDR_START 	(0)

static uint8_t buffr[128];
static int index = 0;
static int _AT24CXX_test(void)
{
	int i=0;
	char wdata = 0x5A;
	if (index % 2 == 1){
		wdata = 0xA5;
	}
	for(i=0;i<128;i++)
	{
		buffr[i] = wdata;
	}
	
	AT24CXX_Write(ADDR_START,buffr,128);
	
	memset(buffr,0,128);
	
	AT24CXX_Read(ADDR_START,buffr,128);
	
	for(i=0;i<128;i++)
	{
		if (buffr[i] != wdata){
			return -1;
		}
	}
	return 0;
}


void AT24CXX_test(void){
	while(_AT24CXX_test() == 0){
		index++;
	};
}

#endif