168 lines
3.6 KiB
C
168 lines
3.6 KiB
C
/*
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* File : 24LCxx.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-09-21 JoyChen First version, support 24LC024H eeprom device
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*/
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#include <rtthread.h>
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#include "i2c.h"
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#define EE_Address 0xA0
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#define EE24LC024H
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/*
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Note: If eeprom size lager then 256 byte, you must define EE_ADDR_SIZE == I2C_MEM_2Bytes
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*/
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#ifdef EE24LC024H
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#define EE_PageSize 8
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#define EE_ADDR_SIZE I2C_MEM_1Byte
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#define EE_MEM_SIZE 256
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#define EE_PageSize 16
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#endif
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static struct rt_device ee_dev;
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uint32_t EE_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t NumByteToRead)
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{
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return I2C_IORW(I2C1, pBuffer, NumByteToRead, ReadAddr, EE_Address | 0x01, I2C_MEM_1Byte );
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}
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uint32_t EE_WritePage(uint8_t* pBuffer, uint16_t WriteAddr)
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{
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I2C_IORW(I2C1, pBuffer, EE_PageSize , WriteAddr, EE_Address , EE_ADDR_SIZE );
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/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
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rt_kprintf("EE ACK failed\n");*/
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rt_thread_delay(50);
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}
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uint32_t EE_WriteByte(uint8_t* pBuffer, uint16_t WriteAddr)
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{
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I2C_IORW(I2C1, pBuffer, 1 , WriteAddr, EE_Address, EE_ADDR_SIZE );
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/*if( I2C_AcknowledgePolling(I2C1 , EE_Address) == Error )
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rt_kprintf("EE ACK failed\n");*/
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rt_thread_delay(50);
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}
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Status EE_WriteBuffer(uint8_t* pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
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{
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uint8_t NumOfPage = 0, NumOfSingle = 0;
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uint16_t Addr = 0,count = 0;
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uint8_t* ptr = pBuffer;
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Addr = WriteAddr;
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count = NumByteToWrite;
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if( (WriteAddr + NumByteToWrite ) > EE_MEM_SIZE )
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return Error;
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while( count >= EE_PageSize )
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{
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EE_WritePage(ptr, Addr);
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Addr += EE_PageSize;
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count -= EE_PageSize;
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ptr += EE_PageSize;
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}
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while( count )
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{
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EE_WriteByte( ptr++, Addr++ );
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count--;
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}
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return Success;
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}
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static rt_err_t ee24LCxx_init (rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_size_t ee24LCxx_read( rt_device_t dev, rt_off_t pos, void *buf, rt_size_t size )
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{
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if( EE_ReadBuffer(buf, pos, size) == Success )
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return size;
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else
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return -1;
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}
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static rt_size_t ee24LCxx_write( rt_device_t dev, rt_off_t pos, void *buf, rt_size_t size )
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{
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if( EE_WriteBuffer(buf, pos, size) == Success )
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return size;
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else
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return -1;
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}
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static rt_err_t ee24LCxx_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t ee24LCxx_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t ee24LCxx_control (rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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return RT_EOK;
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}
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void ee24LCxx_hw_init()
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{
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I2C1_INIT();
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ee_dev.init = ee24LCxx_init;
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ee_dev.open = ee24LCxx_open;
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ee_dev.close = ee24LCxx_close;
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ee_dev.read = ee24LCxx_read;
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ee_dev.write = ee24LCxx_write;
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ee_dev.control = ee24LCxx_control;
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ee_dev.type = RT_Device_Class_I2C;
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rt_device_register(&ee_dev, "eeprom", RT_DEVICE_FLAG_RDWR);
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}
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void ee_test()
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{
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char buf[256], read[256];
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int i,ret;
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rt_device_t dev;
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dev = rt_device_find("eeprom");
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for(i = 0; i < 256; i++ )
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{
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buf[i] = i;
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read[i] = 0;
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}
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if( rt_device_write(dev, 0, buf, 256 ) == 256 )
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rt_kprintf("Write Success\n");
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rt_device_read(dev, 0, read, 256 );
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for(i = 0; i < 256; i++ )
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{
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if( buf[i] != read[i] )
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rt_kprintf("EE Failed %X != %X at %d\n", buf[i], read[i], i);
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}
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rt_kprintf("Finsh\n");
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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FINSH_FUNCTION_EXPORT(ee_test, test system);
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#endif
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