/* * 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 #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() { 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_I2C; rt_device_register(&ee_dev, "eeprom", RT_DEVICE_FLAG_RDWR); } void dump_ee() { 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() { 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_FUNCTION_EXPORT(ee_reset, test system); FINSH_FUNCTION_EXPORT(dump_ee, test system); #endif