main.c

双音频解码器MT8870的驱动

#include <REGX51.H>

void Delay1ms(unsigned int count)
{
	unsigned int i,j;
	for(i=0;i<count;i++)
	for(j=0;j<120;j++);
}

void Initial_Uart(void)
{
	TMOD|=0x20;//定时器1，方式2，自动装入8位定时器
	SCON=0x50; //方式1，10位异步收发，允许接收，REN=1 
	TH1=0xfd;  //波特率 9600
 	TL1=0xfd;  //2(smod)*(定时器益出率)/32
 	TR1=1;	   //启动定时器1
}

void Uart_SentData(unsigned char dat)//发送1字节数据
{
	SBUF=dat;
	while(TI==0);//发送完备，硬件置1，由软件置0
		TI=0;	//软件置0  
}

void Uart_SentStr(unsigned char *str)   //发送字符串
{
	while(*str!='\0')
	{
		Uart_SentData(*str);
		str++;
	}
}

unsigned char code CodeMT8870[16]={'D','1','2','3','4','5','6','7','8','9','0','*','#','A','B','C'};
unsigned char Read_MT8870(void)
{
	while(P3_2==0);
	if( (P0&0x0F)>15 )
		return 0xFF;
	else
		return(CodeMT8870[P0&0x0F]);
}

main()
{
	Initial_Uart();

	while(1)
	{
//		Uart_SentStr("0123456#");
		Uart_SentData(Read_MT8870());
		Delay1ms(100);
	}
}