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/*
* File : 24LCxx.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2011-09-21 JoyChen First version, support 24LC024H eeprom device
*/
#include <rtthread.h>
#include "i2c.h"
#define EE_Address 0xA0
#define EE24LC024H
/*
Note: If eeprom size lager then EE_MEM_SIZE byte, you must define EE_ADDR_SIZE == I2C_MEM_2Bytes
*/
#ifdef EE24LC024H
#define EE_ADDR_SIZE I2C_MEM_1Byte
#define EE_MEM_SIZE 256
#define EE_PageSize 16
#endif
static struct rt_device ee_dev;
uint32_t EE_ReadBuffer(void *pBuffer, rt_off_t ReadAddr, rt_size_t NumByteToRead)
{
return I2C_IORW(I2C1, (uint8_t *)pBuffer, (uint16_t)NumByteToRead, (uint16_t)ReadAddr, EE_Address | 0x01, I2C_MEM_1Byte );
}
uint32_t EE_WritePage(void *pBuffer, uint16_t WriteAddr)
{
I2C_IORW(I2C1, (uint8_t *)pBuffer, EE_PageSize , WriteAddr, EE_Address , EE_ADDR_SIZE );
/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
rt_kprintf("EE ACK failed\n");*/
rt_thread_delay(50);
return 0;
}
uint32_t EE_WriteByte(void *pBuffer, uint16_t WriteAddr)
{
I2C_IORW(I2C1, (uint8_t *)pBuffer, 1 , WriteAddr, EE_Address, EE_ADDR_SIZE );
/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
rt_kprintf("EE ACK failed\n");*/
rt_thread_delay(50);
return 0;
}
Status EE_WriteBuffer(const void *pBuffer, rt_off_t WriteAddr, rt_size_t NumByteToWrite)
{
uint8_t NumOfPage = 0, NumOfSingle = 0;
uint16_t Addr = 0,count = 0;
uint8_t *ptr = (uint8_t *)pBuffer;
Addr = (uint16_t)(WriteAddr&0xFFFF);
count = (uint16_t)(NumByteToWrite&0xFFFF);
if ((WriteAddr + NumByteToWrite) > EE_MEM_SIZE)
return Error;
while (count >= EE_PageSize)
{
EE_WritePage(ptr, Addr);
Addr += EE_PageSize;
count -= EE_PageSize;
ptr += EE_PageSize;
}
while (count)
{
EE_WriteByte(ptr++, Addr++);
count--;
}
return Success;
}
static rt_err_t ee24LCxx_init(rt_device_t dev)
{
return RT_EOK;
}
static rt_size_t ee24LCxx_read(rt_device_t dev, rt_off_t pos, void *buf, rt_size_t size)
{
if (EE_ReadBuffer(buf, pos, size) == Success)
return size;
else
return -1;
}
static rt_size_t ee24LCxx_write(rt_device_t dev, rt_off_t pos, const void *buf, rt_size_t size)
{
if (EE_WriteBuffer(buf, pos, size) == Success)
return size;
else
return -1;
}
static rt_err_t ee24LCxx_open(rt_device_t dev, rt_uint16_t oflag)
{
return RT_EOK;
}
static rt_err_t ee24LCxx_close(rt_device_t dev)
{
return RT_EOK;
}
static rt_err_t ee24LCxx_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
return RT_EOK;
}
void ee24LCxx_hw_init(void)
{
uint32_t delay, i;
I2C1_INIT();
for (i =0; i < 4; i++)
{
delay = 0xFFFFF;
while (delay--);
}
ee_dev.init = ee24LCxx_init;
ee_dev.open = ee24LCxx_open;
ee_dev.close = ee24LCxx_close;
ee_dev.read = ee24LCxx_read;
ee_dev.write = ee24LCxx_write;
ee_dev.control = ee24LCxx_control;
ee_dev.type = RT_Device_Class_Unknown;
rt_device_register(&ee_dev, "eeprom", RT_DEVICE_FLAG_RDWR);
}
void dump_ee(void)
{
rt_device_t dev;
char buf[EE_MEM_SIZE];
int i, j;
dev = rt_device_find("eeprom");
rt_device_read(dev, 0, buf, EE_MEM_SIZE );
for (i = 0; i < 16; i++)
{
for (j = 0; j < 16; j++)
{
rt_kprintf("0x%02X ", buf[ i*16+ j]);
}
rt_kprintf("\n");
}
}
void ee_reset(void)
{
char buf[EE_MEM_SIZE], read[EE_MEM_SIZE];
int i;
rt_device_t dev = rt_device_find("eeprom");
for (i = 0; i < EE_MEM_SIZE; i++)
{
buf[i] = 0xFF;
read[i] = 0;
}
if (rt_device_write(dev, 0, buf, EE_MEM_SIZE ) == EE_MEM_SIZE)
rt_kprintf("Write Success\n");
rt_device_read(dev, 0, read, EE_MEM_SIZE );
for (i = 0; i < EE_MEM_SIZE; i++)
{
if (buf[i] != read[i])
rt_kprintf("EE Failed %X != %X at %d\n", buf[i], read[i], i);
}
}
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(ee_reset, test system);
FINSH_FUNCTION_EXPORT(dump_ee, test system);
#endif
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