从 pic24fv16k301

如何解决从 pic24fv16k301

我想从 pic24fv16k301 微控制器读取 SPI 值。如果 1 或 2 从微控制器发送 LED 将打开，但当我发送它时什么也没有发生。我没有在图片上进行 SPI 编程的经验，所以我认为这将是一个好的开始。数据通过arduino发送。通过将其连接到另一个 arduino 来测试 arduino 代码，这似乎有效。

这是代码

#include <xc.h>
#include "Header_School_Project.h"
#include <stdlib.h>
#include <stdio.h>

#define FOSC    (7370000ULL)         //Allows to use the macros of the __delay_ms function in xc16
#define FCY     (FOSC/2)
#include <libpic30.h>

#define _XTAL_FREQ 20000000
#define LED_HIGH PORTBbits.RB2       
#define LED_LOW PORTAbits.RA4     

#define HIGH_VALUE        1          
#define LOW_VALUE         2 

void SPI_Master_Init()
{   
    SPI1CON1bits.MSTEN  = 1; //Set SPI to master
    SPI1CON1bits.SMP    = 0; //Input data is sampled at the middle of output
    SPI1STATbits.SPIROV = 0; //No overflow is occuring
    SPI1STATbits.SPIEN  = 1; //Enables SCK,SDO,SDI as serial ports
    
    //Configure clock polarity & phase
    SPI1CON1bits.CKE = 0;
    SPI1CON1bits.CKP = 0;
    
    TRISBbits.TRISB13 = 0;  //RB13 = sdo -> OUTPUT
    TRISBbits.TRISB14 = 1;  //RB14 = sdi -> INPUT
    TRISBbits.TRISB12 = 0;  //RB12 = sck -> OUTPUT  
    //
}

char SPI_read()
{
    while(!IFS0bits.SPI1IF);
    IFS0bits.SPI1IF=0;
    return(SPI1BUF);
}


void main(void)
{
    TRISBbits.TRISB2 = 0;          
    TRISAbits.TRISA4 = 0;
    ANSA = 0;              //sets to digital
    ANSB = 0;
    SPI_Master_Init();             //Initialize the SPI in Master Mode
    char buffer;
    //---------------------------------

    while(1)
    {
      buffer = SPI_read();                              
        if(buffer == HIGH_VALUE)                          
        {
            LED_HIGH = 1;                              
            LED_LOW = 0;
        }
        if(buffer == LOW_VALUE)                       
        {
            LED_LOW = 1;                               
            LED_HIGH = 0;
        }
      }
}

如果有人可以帮助在 pic24 上接收 SPI 数据，那将不胜感激。