funcfile.c

本人编写的无线电话程序,给予PIC18C801设计,包括了uCOS的移植以及菜单,自己设计的拼音注入法,完整地一级汉字库,希望对大家有所帮助

//These codes contains the functions to operate the 24C64 EEPROM
//For the reason that the length of address domain is longer, the library 
//functions of serial I2C EEPROM con not be used derectly

// The operation on EEPROM can't be done by multiple user simultanously, so a semephone is 
// applied when write or read the EEPROMs

#include <p18cxxx.h>

#include "includes.h"
#include "ComStruct.h"
#include "funcprom.h"
#include "funcfile.h"
#include "device.h"
#include "feeprom.h"

extern unsigned char DebugContent[48];

extern OS_EVENT  * rom EepromSem;
extern OS_EVENT	*rom peventMCNM;
extern OS_EVENT	*rom peventDVS;

extern INT16U GetMCNMFileLen(void);
extern INT16U GetDVSFileLen(void);

//Public functions

typedef rom struct FileTableItem{
	INT16U	Start;
	INT16U	End;
}FILETABLEITEM;

typedef rom struct FileTable{
	INT16U U_W;                              //unique word, mark if these EEPROMs have been initialized
	INT32U SN;                                  //serial number of the equipment, write before shipping
	FILETABLEITEM FileIndex[MAXFILENUM];                                     //The File alocation table
	INT8U ChkSum;                                                   //Check Sum of all the former parts
} FILETABLE;

#pragma romdata EXTRAM

FILETABLE FileSys;
INT8U rom hdl_eeprom;
//FileHandle: handle of the file
//Position:   start position of the data to be saved. it's the offset from the start address in the EEPROM 
//            of the file
//ptrData:    start address of the data in the ram
//DataLen:    length of the data to be saved
//For example, FileSave(HANDLEX, 2, 0x103000, 20)
// if HANDLEX relating with a file saved in EEPROM ranging from 0x2300 to 0x2400, then the function save 20 
// bytes in the ram begining at 0x103000 into EEPROM address from 0x2302 to 0x230e
INT8U FileSave(INT8U FileID, INT16U Position, INT8U rom * ptrData, INT16U DataLen){
	INT8U Temp,i,err;
	INT16U PhyPos;                                                               //physical address in EEPROM
	INT16U writetimes;
	
	//if(FileID != OSPrioCur) return (1);                            //return if it's not the owner of the file
	if (FileSys.FileIndex[FileID].Start == 0xffff) return (1);	     //return if the file has not been create
	PhyPos = FileSys.FileIndex[FileID].Start + Position;                //calaulate the start address of EEPROM
	
	if((PhyPos > FileSys.FileIndex[FileID].End) ||
	   ((PhyPos+DataLen-1)> FileSys.FileIndex[FileID].End)){
		return (1);                               //if the data to be saved is not in the legal range, return
	}
	else{                                                                       //exacute the write operation
		OSSemPend (EepromSem,0,&err);                                                   //seize the semephone
		if(err != OS_NO_ERR) return (0xff);
		sysdev_ioctl(hdl_eeprom, EEPROM_ADDRESS, PhyPos);
		err = sysdev_write(hdl_eeprom, ptrData, i);
		OSSemPost (EepromSem);                                   //finish writing
		return(0);
	}
}
INT8U FileRead(INT8U FileID, INT16U Position, INT8U rom * ptrData, INT16U DataLen){
	INT8U Temp,i,err;
	INT16U PhyPos;
	INT16U rom1len,rom2len;
	
	//for test
	rom1len = FileSys.FileIndex[FileID].Start;
	rom2len = FileSys.FileIndex[FileID].End;
	//
	if (FileSys.FileIndex[FileID].Start == 0xffff) return (1);	     //return if the file has not been create
	
	PhyPos = FileSys.FileIndex[FileID].Start + Position;
	
	if((PhyPos > FileSys.FileIndex[FileID].End) ||
	   ((PhyPos+DataLen-1)> FileSys.FileIndex[FileID].End)){
		return (1);
	}
	OSSemPend (EepromSem,0,&err);
	if(err != OS_NO_ERR) return (0xff);
	sysdev_ioctl(hdl_eeprom, EEPROM_ADDRESS, PhyPos);
	sysdev_read(hdl_eeprom, ptrData, DataLen);
	OSSemPost (EepromSem);
	return(0);
}