NIOSII数码管显示出错了···
#include "stdio.h"#include "sys/unistd.h"
#include "io.h"
#include "string.h"
#include "system.h"
#include "altera_avalon_pio_regs.h"
#include "altera_avalon_timer_regs.h"
#include "alt_types.h"
#include "sys/alt_irq.h"
//0-9
unsigned char segtab={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char led_buffer={0};
unsigned char bittab={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
static unsigned char cnt=0;
static void timer_init(void);
int main(void)
{
unsigned char i=0,j=0;
unsigned char buf;
timer_init();
while(1){
sprintf(buf,"%08u",j++);
for(i=0;i<8;i++){
led_buffer=buf-'0';
}
usleep(500);
}
return 0;
}
static void timer_irq(void*context,alt_u32 id)
{
IOWR_ALTERA_AVALON_PIO_DATA(SCL_BASE,0xff);
IOWR_ALTERA_AVALON_PIO_DATA(SCL_BASE,bittab);
IOWR_ALTERA_AVALON_PIO_DATA(SDA_BASE,segtab]);
cnt++;
if(cnt==8)
cnt=0;
IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_0_BASE,0);
}
static void timer_init(void)
{
IOWR_ALTERA_AVALON_TIMER_STATUS(TIMER_0_BASE,0);
IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_0_BASE,200000);
IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_0_BASE,200000>>16);
IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_0_BASE,0x07);
alt_irq_register(TIMER_0_IRQ,NULL,timer_irq);
}
这是一段NIOSII数码管显示的代码，可出来的结果是8个8，请路过的大侠帮忙指导下，谢谢···
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