STC12C5A60S2_SPI

综述

测试中发现硬件SPI在传输的时候容易出bug，有时候MOSI不会被拉低，导致数据错误，不知道如何解决。
这里只展示最简单发送数据。

SPI所涉及寄存器

SPCTL

SPSTAT

例程

SPI.c

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#include "SPI.h"

sbit LED = P3^0;


void delay3us(void)  
{
    unsigned char a;
    for(a=5;a>0;a--);
    _nop_();  
}

void SPI_Init()
{
	SPDAT = 0x00; 		//clear dat
	
	SPSTAT = SPIF|WCOL;		
	
	SPCTL = SPEN|MSTR|SPDHH|CPHA|CPOL;	//master  CPOL = 1  CPHA = 1
	
	IE2|=ESPI;
	
	EA = 1;
}


void SPI_WR_Byte(unsigned char dat)	// 1 dat   0 cmd
{
	SPDAT=dat;
	delay3us();		//need some delay  
}

void SPI_Interrupt() interrupt 9 
{
	SPSTAT = SPIF|WCOL;
	SPISS = 1;
}

SPI.h

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#ifndef __SPI_OLED12864_H
#define __SPI_OLED12864_h

#include <reg52.h>
#include <intrins.h>

sfr SPCTL = 0xce;
sfr SPSTAT = 0xcd;
sfr SPDAT = 0xcf;
sfr AUXR = 0xa2;

sfr IE2 = 0xaf;

sbit SPISS = P1^3;


#define SPIF  0x80
#define WCOL  0x40

#define SSIG  0x80
#define SPEN  0x40
#define DORD  0x20
#define MSTR  0x10
#define CPOL  0x08
#define CPHA  0x04

#define SPDHH  0x00
#define SPDH  0x01
#define SPDL  0x02
#define SPDLL  0x03

#define ESPI 0x02


/**********

MOSI = P1^5
MISO = P1^6
SPICLK = P1^7

**********/



void SPI_Init();
void SPI_WR_Byte(unsigned char dat);


#endif


main.c

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#include "main.h"



void main()
{
	SPI_Init();
	while(1)
	{
		SPI_WR_Byte(0x66);
		SPI_WR_Byte(0x76);
		SPI_WR_Byte(0x86);
		SPI_WR_Byte(0x96);
	}
}

main.h

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#ifndef __MAIN_H
#define __MAIN_H

#include <reg52.h>
#include "SPI.h"
#include <intrins.h>

#endif