spi.txt

使用c8051f005通过SPI读取SCA100T角度值的程序

使用c8051f005通过SPI读取SCA100T角度值的程序收藏

c8051f005读取SCA100T之程序，SCA100T仍是VI出的一款角度传感器，测量范围为+90～-90度，具体资料见其PDF

 

//spi.h
unsigned int SPI_ReadBits( uchar n );
void SPI_WriteByte( uchar wdata );
void SPI_Start(void);
void SPI_Stop(void);
void SPI_Reset(void);
void SPI_Delay(unsigned char);
unsigned int SPI_GetX( void );
unsigned int SPI_GetY( void );
void SPI_Init( void );

#define MEAS 0x00 //测量模式
#define RWTR 0x08 //读写温度数据寄存器
#define STX  0x0E //x通道自检
#define STY  0x0F //Y通道自检
#define RDAX 0x10 //读Ｘ通道加速度值
#define RDAY 0x11 //读Ｙ通道加速度值

sbit CLK = P0^7;
sbit MISO = P1^0;
sbit MOSI = P1^1;
sbit CSB = P1^2;

 

//spi.c
#include <c8051f000.h>
#include "defs_c51_manio.h"
#include "spi.h"




void SPI_Stop( void ){
    CLK = LOW;
    CSB = HIGH;    
    SPI_Delay(10);
}
void SPI_Reset(void){
    SPI_Stop();
}

void SPI_Delay(uchar n){
    while(n--);
}

void SPI_Start(void){
    CLK = LOW;
    CSB = LOW;
    SPI_Delay(10);
}



//主机写一个BYTE到器件
//最终状态:CLK　=　LOW
void SPI_WriteByte( uchar wdata ){
    uchar i;

    for( i = 0 ; i < 8 ; ++i ){
        CLK = LOW;
        SPI_Delay(10);
        MOSI = wdata & 0x80;
        wdata = wdata << 1;
        SPI_Delay(10);
        CLK = HIGH;
        SPI_Delay(10);
    }
    CLK = LOW;
}
/*
//主机读入一个比特
//结束状态:　CLK=0
bit SPI_ReadBit(void){
    CLK = HIGH;
    SPI_Delay(10);
    CLK = LOW;
    SPI_Delay(10);
    return MISO;

}
*/

//主机读入N个比特
//n 限制为16及其以下
//结束状态　CLK　=　0
uint SPI_ReadBits( uchar n ){
    uint rtemp,i;
    MISO = 1;
    for( i = 0 ; i < n ; ++i ){
        rtemp <<= 1    ;
        SPI_Delay(10);
        if( MISO == 1 ){
            rtemp |= 0x0001;
        }else{
            rtemp &= 0xFFFE;
        }
        CLK = HIGH;
        SPI_Delay(10);
        CLK = LOW;
        SPI_Delay(10);

    }
    return rtemp;
}

uint SPI_GetX( void ){
    uint result;
    SPI_Start();
    SPI_WriteByte( RDAX );
    result = SPI_ReadBits(11);
    SPI_Stop();
    return result;

}

uint SPI_GetY( void ){
    uint result;
    SPI_Start();
    SPI_WriteByte( RDAY );
    result = SPI_ReadBits(11);
    SPI_Stop();
    return result;

}

void SPI_Init( void ){
    SPI_Start();
    SPI_WriteByte( MEAS );
    SPI_Stop();

}
 

//defs_c51_manio.h
//manio's 51 defs
#define TRUE     1
#define FALSE    0

#define HIGH    1
#define LOW        0

#define uchar   unsigned char
#define uint    unsigned int
#define ulong   unsigned long

sbit P0_0 = P0^0;
sbit P0_1 = P0^1;
sbit P0_2 = P0^2;
sbit P0_3 = P0^3;
sbit P0_4 = P0^4;
sbit P0_5 = P0^5;
sbit P0_6 = P0^6;
sbit P0_7 = P0^7;

sbit P1_0 = P1^0;
sbit P1_1 = P1^1;
sbit P1_2 = P1^2;
sbit P1_3 = P1^3;
sbit P1_4 = P1^4;
sbit P1_5 = P1^5;
sbit P1_6 = P1^6;
sbit P1_7 = P1^7;

sbit P2_0 = P2^0;
sbit P2_1 = P2^1;
sbit P2_2 = P2^2;
sbit P2_3 = P2^3;
sbit P2_4 = P2^4;
sbit P2_5 = P2^5;
sbit P2_6 = P2^6;
sbit P2_7 = P2^7;

sbit P3_0 = P3^0;
sbit P3_1 = P3^1;
sbit P3_2 = P3^2;
sbit P3_3 = P3^3;
sbit P3_4 = P3^4;
sbit P3_5 = P3^5;
sbit P3_6 = P3^6;
sbit P3_7 = P3^7; 
 

//main.c
/****************************************************
 * Template for C8051F00x written by Manio,http://blog.csdn.net/manio
 * This template aim to make the program more clear
 * to read and write.
 * Any other function file should follow this rule.
 ****************************************************/

#include <c8051f000.h>
#include "defs_c51_manio.h"
#include "spi.h"
/////////////////////////////////////////////////////
// Include function head file here 
/////////////////////////////////////////////////////


/////////////////////////////////////////////////////
// Define Global macro #define xxx xxxxx
/////////////////////////////////////////////////////


/////////////////////////////////////////////////////
// Define Global var
/////////////////////////////////////////////////////


/////////////////////////////////////////////////////
// DECLARE LOCAL FUNCTION
/////////////////////////////////////////////////////
void MCU_Init(void);

void LongDelay( void ){
    uint i ;
    for ( i = 0 ; i < 30 ; ++i );
}

main(){
    uint result;
    //CLEAN THE DOG
    WDTCN = 0xde;                              // disable watchdog timer
    WDTCN = 0xad;

    //SET THE CRYSTAL
    //OSCICN = (OSCICN & 0xf0) | 0x07;        //use the inner crystal and set to 16MHZ

    //All the module initial here
    MCU_Init(); 
    
    P1 = 0xf0;                            //Initialize the inner reg, etc.interrupt timer pwm...


    //Operations

    SPI_Reset();
    SPI_Delay(1000);

    SPI_Init();    
    SPI_Delay(1000);

    while(1){
        result = SPI_GetX();
        //P1 = result >>3;
        //LongDelay();
    }
}


/////////////////////////////////////////////////////
// DEFINE FUNCTION USED IN MAIN
/////////////////////////////////////////////////////

/****************************************************
 * MCU_Init
 * Function: initiallize interrupt ,crystal .... 
 ****************************************************/
void MCU_Init(void){
    //SET THE CROSSBAR eg. XBR0 XBR1    XBR2 
    XBR2 = 0x40;

    //SET THE IO MODE PRTxCF
    PRT0CF = 0xff;
    PRT1CF = 0xff;


    //Timer Init

    //Interrupt Setting

    //Interrupt Enable Disable

    //Other inner reg setting ,LIKE SMBus PWM PCA...



    //Global interrupt Enable or Disable
    //EA = 1;

}


/////////////////////////////////////////////////////
// DEFINE INTERRUPT FUNCTION