usart.c~

使用AVR单片机实现的万年历功能,其中使用了ds1302和1602

#include "usart.h"


void UsartInit(void)
{
	UBRRH = (unsigned char)(((unsigned int)((unsigned long)CRYSTAL/(16*(unsigned long)BAUD)-1)) >> 8);                   //
	UBRRL = (unsigned char)((unsigned int)((unsigned long)CRYSTAL/(16*(unsigned long)BAUD)-1));
	UCSRC = 0xA6;                //设置偶校验，1位停止位，8位数据位
	UCSRA = 0x00;                //不设置倍速，波特率分频器分频系数为16
	UCSRB = 0x98;                //使能接收中断，使能接收和发送
	usartCounter = 0;
	DDRD.0 = 0;
	DDRD.1 = 1;
}

interrupt [USART_RXC] void UsartReceive (void)
{
	unsigned char status;
	unsigned char data;
	unsigned char iCycle;
	status = UCSRA;
	data = UDR;

	if((status & 0x1C) == 0x00)
	{

		if (data == 0xBB)
		{
			dataReceiveOK = 1;
			usartCounter = 0;
		}
		else if (data == 0xEE)
		{
			dataReceiveOK = 0;

			if (usartCounter == 8)
			{
				UDR = 0x01;

				for (iCycle = 0; iCycle < 8; iCycle++)
				{
					DS1302Data[iCycle] = reBuffer[iCycle];
				}
				
				DS1302checkDataOve();
				FindDataOfWeek();
				DS1302WriteTimeData();

			}
			else
			{
				UDR = 0x00;
			}
		}
		else
		{

			if (dataReceiveOK)
			{
				reBuffer[7-usartCounter] = data;
				++usartCounter;
			}
		}
	
	}
}

//interrupt [USART_TXC] void UsartTransmit (void)
//{
//}