per.h

Keil 下编译的基于mcs51单片机的PCA82C250CAN收发器控制的程序源代码。

//              ADFullValue---full value that A/D converter can store;
//              Vref---reference voltage of A/D converter.
//return:       input voltage.
//******************************************************************************************
//float AD_V(unsigned int ADValue,unsigned int ADFullValue,float Vref);
//******************************************************************************************
//function:     float sensor_value(unsigned int Rs1,unsigned int ad);
//description:  calculate the sensor's resistance by given parameter.
//parameter:    Rs1---resistance of the sensor bridge;
//              ad---the A/D result
//return:       the sensor's resistance.
//******************************************************************************************
float sensor_value(float Rs1,float ad);
/*
///////////////////prototype for PWM/////////////////////////////////////////////
//*******************************************************************************
//function:  bit timer2_init(float fre);
//input:     float fre (KHz)timer2 overflow frequency
//return:    1  error;
//           0  right;
//*******************************************************************************
//bit timer2_init(float);    //timer2 initialization (used for interrupt function);
//*******************************************************************************
//function:  bit timer2_init_auto(float fre);
//input:     float fre (KHz)timer2 overflow frequency
//return:    1  error;
//           0  right;
//*******************************************************************************
bit timer2_init_auto(float);//timer2 initialization (used for autoreload function;
//*******************************************************************************
//function:  void timer2_load(unsigned char num,float rate);
//input:     unsigned char num   select cc;(if timer2 is used for autoreload mode,
//           cc0 may not be used)
//           float rate  PWM pulse duty sycle 0~100;
//return:    none;
//*******************************************************************************
void timer2_load(unsigned char,float); //timer2 load value for pulse generation;

*/
///////////////////////operations about X5045///////////////////////////////
//*****************************************************************************************
//function:       unsigned char read_8bit(void);
//description:    this function read 8 bit from x5045
//parameter:      none
//return:         the read byte 
//*****************************************************************************************
unsigned char read_8bit(void);
//*****************************************************************************************
//function:       void write_8bit(unsigned char WriteValue);
//description:    this function write 8 bit to x5045
//parameter:      the value need to be write
//return:         none
//*****************************************************************************************
void write_8bit(unsigned char WriteValue);
void write_8bit1(unsigned char WriteValue);
//*****************************************************************************************
//function:       void init_5045wdt(unsigned char WatchDogTime);
//description:    this function initialize the x5045 watch dog timer
//parameter:      watch dog time 
//return:         none
//*****************************************************************************************
void init_5045wdt(unsigned char WatchDogTime);
//*****************************************************************************************
//function:       void write_byte(unsigned char address,unsigned char content);
//description:    this function write one byte to  x5045 
//parameter:      address---address of memory need to be write ;content---content need to be write
//return:         none
//*****************************************************************************************
void write_byte(unsigned char address,unsigned char content);
//*****************************************************************************************
//function:       unsigned char read_byte(unsigned char address);
//description:    this function read one byte from  x5045 
//parameter:      address---address of memory need to be read
//return:         the read content.
//*****************************************************************************************
unsigned char read_byte(unsigned char address);
//*****************************************************************************************
//function:       void write_page_float4(unsigned char StartAddr,float value);
//description:    this function write float data to x5045,the first byte address is specified
//parameter:      StartAddr---the first address of the unit will be write;value---value to be write
//return:         none
//*****************************************************************************************
void write_page_float4(unsigned char StartAddr,float value);//write 4 byte float data to x5045
//*****************************************************************************************
//function:       void write_page_array12(unsigned char StartAddr,unsigned char *p)
//description:    this function write 12 byte data to x5045,the first byte address is specified
//parameter:      StartAddr---the first address of the unit will be write;value---value to be write
//				  p---pointer to array
//return:         none
//*****************************************************************************************
void write_page_array12(unsigned char StartAddr,unsigned char *p);//write 12 byte data to x5045
//*****************************************************************************************
//function:       void write_page_array4(unsigned char StartAddr,unsigned char *p)
//description:    this function write 4 byte data to x5045,the first byte address is specified
//parameter:      StartAddr---the first address of the unit will be write;value---value to be write
//				  p---pointer to array
//return:         none
//*****************************************************************************************
//void write_page_array4(unsigned char StartAddr,unsigned char *p);//write 4 byte data to x5045
void write1_page_array4(unsigned char StartAddr,unsigned char *p);//write 12 byte data to x5045
//*****************************************************************************************
//function:       float read_page_float4(unsigned char FirstAddr);
//description:    this function read float data from x5045,the first byte address is specified
//parameter:      addr---the first address of the unit will be read;
//return:         the storing float data
//*****************************************************************************************
float read_page_float4(unsigned char FirstAddr);
float read1_page_float4(unsigned char FirstAddr);
////////////////////prototype for watchdog///////////////////////////////////////
//*******************************************************************************
//function:     void wdt_start(void);
//description:  initialize watch dog timer
//parameter:    none
//return:       none
//********************************************************************************
void wdt_init(void);//watchdog timer start
//********************************************************************************
//function:  void wdt_refresh(void);
//input:     none;
//return:    none;
//********************************************************************************
void wdt_refresh(void);  //watchdog timer refresh;

//////////// functions for finding bit from message table/////////////////////////
//******************************************************************************
//function:     bit get_bit(unsigned char ModuleName,unsigned char BitNumber,   
//                          unsigned char * BasePointer);                                
//description:  thi function get the bit value from specified location of      
//              the seven row and eight line array such as MsgTrans[7][8].          
//parameter:    ModuleName---which module;BitNumber---bit location of the data block   
//              BasePointer---the pointer pointing to the base address.              
//return:       the bit value.                                                  
//******************************************************************************
bit get_bit(unsigned char ModuleName,unsigned char BitNumber,unsigned char * BasePointer);
//******************************************************************************
//function:     void set_bit(unsigned char ModuleName,unsigned char BitNumber,bit value   
//                          unsigned char * BasePointer);                                
//description:  thi function set the bit value specified location of      
//              the seven row and eight line array such as MsgTrans[7][8].          
//parameter:    ModuleName---which module;BitNumber---bit location of the data block
//				value---specified bit value;   
//              BasePointer---the pointer pointing to the base address.              
//return:       none.                                                                    |
//******************************************************************************
void set_bit(unsigned char ModuleName,unsigned char BitNumber,bit value,unsigned char * BasePointer);
//******************************************************************************
//function:     bit get_bit1(unsigned char ModuleName,unsigned char BitNumber,   
//                          unsigned char * BasePointer);                                
//description:  thi function get the bit value from specified location of      
//              the seven row and eight line array such as MsgTrans[7][8].          
//parameter:    ModuleName---which module;BitNumber---bit location of the data block   
//              BasePointer---the pointer pointing to the base address.              
//return:       the bit value.                                                                    |
//******************************************************************************
bit get_bit1(unsigned char ModuleName,unsigned char BitNumber,unsigned char * BasePointer);

//******************************************************************************
//function:     void set_bit1(unsigned char ModuleName,unsigned char BitNumber,bit value   
//                          unsigned char * BasePointer);                                
//description:  thi function set the bit value specified location of      
//              the seven row and eight line array such as MsgTrans[7][8].          
//parameter:    ModuleName---which module;BitNumber---bit location of the data block
//				value---specified bit value;   
//              BasePointer---the pointer pointing to the base address.              
//return:       none.                                                                    |
//******************************************************************************
void set_bit1(unsigned char ModuleName,unsigned char BitNumber,bit value,unsigned char * BasePointer);

//******************************************************************************