rt-thread-official/bsp/stm32f20x/Drivers/24LCxx.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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, int 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