uart.c

ucos移植到m64

#define _UART_C_

#define BAUD 	38400
#define CRYSTAL	11059200
#define BAUD_SETTING	(unsigned int)((unsigned long)CRYSTAL/(16*(unsigned long)BAUD)-1)
#define BAUD_H	(unsigned char)(BAUD_SETTING>>8)
#define BAUD_L	(unsigned char)(BAUD_SETTING)

#include "includes.h"
extern uint8 isrCount;

void uartInit(uint8 uartNum)
{
	if(1==uartNum)
	{
		 UCSR1B = 0x00; //disable while setting baud rate
	 	 UCSR1A = 0x00;
	 	 UCSR1C = 0x06;
	 	 UBRR1L = BAUD_L; //set baud rate lo
	 	 UBRR1H = BAUD_H; //set baud rate hi
	 	 UCSR1B = 0x18;
	 	 ///共有3个中断源， 接受， 发送， 寄存器空， 对应此寄存器的高3位
	}	
	else
	{
		UCSR0B = 0x00; //disable while setting baud rate
	 	UCSR0A = 0x00;
		UCSR0C = 0x06;	//set frame format, 8 bits, 2stop]
		UBRR0H = BAUD_H;
		UBRR0L = BAUD_L;
		UCSR0B = 0x18;	//enable receive and transmite
		
	}	
}

void putChar(uint8 num, uint8 dat)
{
	ENTER_CRITICAL();
	if(1==num)
	{
		UDR1 = dat;
		while(!(UCSR1A&BIT(TXC1)));	  //发送寄存器空
		UCSR1A|=BIT(TXC1);
	}
	else
	{
		UDR0 = dat;
		while(!(UCSR0A&BIT(TXC0)));
		UCSR0A|=BIT(TXC0);
	}
	EXIT_CRITICAL();
}	

void putStr(uint8 num, uint8 * str)
{
	ENTER_CRITICAL();
	while(*str)
	{
		putChar(num, *str);
		str++;
	}
	EXIT_CRITICAL();	
}	

void putNum(uint8 port, uint8 num)
{
	if((num>>4)<='9')
	{
		putChar(port, (num>>4)+'0');
	}
	else
	{
		putChar(port, (num>>4)+'A');
	}
	if((num&0x0f)<='9')
	{
		putChar(port, (num&0x0f)+'0');
	}
	else
	{
		putChar(port, (num&0x0f)+'A');
	}			
}	

uint8 getChar(uint8 num)	
{
	uint8 temp=0;
	ENTER_CRITICAL();
	if(1==num)
	{
		if(UCSR1A&BIT(RXC1))	//no data
		{
			temp=UDR1;
			UCSR1A|=BIT(RXC1);
		}
	}
	else
	{	
		if(UCSR0A&BIT(RXC0))	//no data
		{
			temp=UDR0;
			UCSR0A|=BIT(RXC0);
		}
	}
	EXIT_CRITICAL();
	return(temp);
}	


////////////////////////////////////////////////
//接受完成中断
////////////////////////////////////////////////
#pragma interrupt_handler uart1_rx_isr:31
void uart1_rx_isr(void)
{
 	ENTER_CRITICAL();//uart has received a character in UDR
 	EXIT_CRITICAL();
}
///////////////////////////////////////////////
//发送寄存器空中断
///////////////////////////////////////////////
#pragma interrupt_handler uart1_udre_isr:32
void uart1_udre_isr(void)
{
 	ENTER_CRITICAL();;//character transferred to shift register so UDR is now empty
 	EXIT_CRITICAL();
}
//////////////////////////////////////////////
//发送完成中断
//////////////////////////////////////////////
#pragma interrupt_handler uart1_tx_isr:33
void uart1_tx_isr(void)
{
 	ENTER_CRITICAL();;//character has been transmitted
 	EXIT_CRITICAL();
}