uart.c

牛人写的AVR单片机操作系统源代码

#include "os_asm.h"
#include "core.h"

void Uart_Init(void)
{
    UCSRB = 0x00; //disable while setting baud rate
    UCSRA = 0x00;
    UCSRC = (1<<URSEL) | 0x06;
    UBRRL = 0x0B; //set baud rate lo
    UBRRH = 0x00; //set baud rate hi
    UCSRB = 0x18;
}

void Uart_Putc(INT8U ch)
{
    while(!(UCSRA & (1 << UDRE)))   //等待发送缓冲区空
    	//OS_Scheduler();
    	OS_DelayTick(1);
    UDR = ch;                       //发送数据
}


INT8U Uart_Getc(void)
{
    while (!(UCSRA & (1<<RXC)))
    	//OS_Scheduler();
    	OS_DelayTick(1);
    return UDR;
}