uart_exp.c

FIR IIR 实验的源代码

#include <cdefBF561.h>
#include <ccblkfn.h>
#include <sys/exception.h>

#include "Exp_Config.h"
#include "sys_func.h"

/*
 * UART Configuartion
 */
#define UART_BAUD_RATE (115200) 

/****************************************************************************************
*	函数名        : Init_ UART
*	函数功能      :配置BF561的UART寄存器
*	说明          :UART各寄存器的介绍请参考ADI公司的
*				《ADSP-BF561 Blackfin Processor Hardware Reference》
****************************************************************************************/
void Init_UART(void)
{
	unsigned long SYS_SCLK=GetSCLK();
	
	unsigned short Divisor =SYS_SCLK / (UART_BAUD_RATE << 4);

	*pUART_GCTL = 0x0001;	//UART Global Control Register
	ssync();
	*pUART_LCR = 0x0083;		//UART Line Control Register, prepare for DLL and DLH setting
	ssync();
	*pUART_DLL = Divisor & 0x00FF;
	*pUART_DLH = (Divisor >> 8) & 0x00FF;	//UART Divisor Latch Registers
	ssync();
	*pUART_LCR = 0x0013;		//UART Line Control Register
	ssync();
	*pUART_MCR = 0x0000;	//Modem Control Register
	*pUART_IER = 0x0003;		//UART Interrupt Enable Register
	ssync();

	while(*pUART_LSR&0xe){
		ssync();
	}
}

EX_INTERRUPT_HANDLER(UART_RX_ISR) 
{ 
	unsigned short data;

	if (*pUART_LSR & 0x0001)
	{
		data = *pUART_RBR;
		*pUART_THR = data;
		while ((*pUART_LSR & 0x0020) == 0);
	}    
} 

void Init_UARTRx_Interrupt(void)
{
	*pSICB_IAR3 = (*pSICB_IAR3)&0xfff0ffff|(2<<16);
	register_handler(ik_ivg9, UART_RX_ISR);
	*pSICB_IMASK0|=(1<<28);
}

void UART_Exp(void)
{
	Init_UART();
	Init_UARTRx_Interrupt();
	while (1)
    {
    	;    
    }    
}