key_test.c

来自「ARM嵌入式常用模块与综合系统设计实例精讲」· C语言 代码 · 共 38 行

#include "GloblDef.h"
#include "key.h"
extern void KeyInitial();
extern BYTE GetKeyValue();
extern BYTE ScanKey();
extern BYTE xdata ScanKeyInterval;	   //键扫描时间

#pragma NOAREGS
void OnTimer() interrupt 1 
{
												/* 键扫描 */
	if(ScanKeyInterval != 0)
		ScanKeyInterval--;
}

main()
{
	BYTE ScanKeyType;
	BYTE tmp;
	SerialInitial();
	InterruptInitial();
	KeyInitial();
	printf("begin");
	
	while(1)
	{
		if((ScanKeyType = ScanKey()) != SCAN_KEY_NO_KEY_PRESSED)
		{
			if(ScanKeyType == SCAN_KEY_CHANGE_KEY_VALUE)
			{
				printf("\b");				
			}
			printf("\n%c",GetKeyValue());
		}
	}
	while(1);
}