#include "alt_types.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "system.h"
#include "altera_avalon_uart_regs.h"
#include "altera_avalon_pio_regs.h"
//#include "sys/alt_flash_regs.h"
#include "sys/alt_flash.h"
#include "sys/alt_irq.h"
#define BUF_SIZE 1024 void alt_busy_sleep(alt_u32 temp);
#ifdef UART_BASE
void uart_handle(void *context,alt_u32 interrupt)
{
unsigned short int data,status;
status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);
while (!(status & ALTERA_AVALON_UART_STATUS_RRDY_MSK))
status = IORD_ALTERA_AVALON_UART_STATUS(UART_BASE);
data =IORD_ALTERA_AVALON_UART_RXDATA(UART_BASE);
//write status reg;
status = ALTERA_AVALON_UART_STATUS_TRDY_MSK;
IOWR_ALTERA_AVALON_UART_STATUS(UART_BASE, status);
IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE, data);
IOWR_ALTERA_AVALON_UART_STATUS(UART_BASE, 0); } void uart_init()
{
alt_u32 control;
int divisor;
//ALTERA_AVALON_UART_CONTROL_TRDY_MSK |
control =
ALTERA_AVALON_UART_CONTROL_RRDY_MSK | ALTERA_AVALON_UART_CONTROL_E_MSK;; IOWR_ALTERA_AVALON_UART_CONTROL(UART_BASE, control);
divisor = (int)(50000000/38400+0.5);
IOWR_ALTERA_AVALON_UART_DIVISOR(UART_BASE, divisor); if (alt_irq_register(UART_IRQ, NULL, uart_handle))
{
IOWR_ALTERA_AVALON_PIO_DATA(PIO_LED_BASE, 0x7f);
}
}
#endif int main(void)
{
char *msg="hello word!";
uart_init();
while(1)
{
printf(msg);
}
return 0;
} 这以上代码不断往串口发字符“hello word!”.用调试工具在电脑上是收到的。你给NIOS发啥它就给你回啥，这都是正常的。 然后我看一些资料。我把main里的代码改成以下 char* msg = "hello world";
FILE* fg;
fg = fopen("/dev/uart","w");
if(fp)
{
fprintf(fp, "%s",msg);
fclose(fp);
} 一看什么东西也没收到啊 好像是没有打开设备。然后我从串口随便发一个字符过去，代码好像死了 烦请版主指导一下是什么问题。谢谢！！！！！！！！！！！！！！！！！！！！！！
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