max7219.c

CAN工业节点设计、CAN控制器为SJA1000.C源码

#include <REGX52.h>
#include "xkcan_defs.h"
#include "max7219.h"

void Update7219 ( ubyte addr, ubyte dat )
{
	bit t;

 	_7219_CLK = 0;
	_7219_CS = SELECTED;

	ACC = addr;
	t = 1;

WriteLoop:
	_7219_MOSI = ACC_7;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_6;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_5;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_4;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_3;
	_7219_CLK = 1;	
	_7219_CLK = 0;

	_7219_MOSI = ACC_2;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_1;
	_7219_CLK = 1;
	_7219_CLK = 0;

	_7219_MOSI = ACC_0;
	_7219_CLK = 1;
	

	if (t == 1) 
	{
		t = 0;
		ACC = dat;
		_7219_CLK = 0;
		goto WriteLoop;
	}

	_7219_CS = UNSELECTED;
	_7219_CLK = 0;
	_7219_CLK = 1;
	_7219_CLK = 0;
	
}