hello!i want to receive data from uart1 every 3 sec,i use the time alarm,the data send 1 sec every time,but i found that the data missing seriously! for examle:the rigth data should be:123456789 but i received from the uart1 is:13579,the band is 4800 and it can't be changed !why?help!
the programm is below:# include <stdio.h># include <string.h># include <unistd.h># include "system.h"# include "alt_types.h"# include "sys/alt_alarm.h"# include "altera_avalon_uart_regs.h"
static alt_alarm alarm1;
alt_u32 my_alarm(void *content)
{int i;
char rd;
char *rc1;
printf("it is timer\n");
do
{ rd=IORD_ALTERA_AVALON_UART_RXDATA(UART1_BASE);
}
while(rd!='$');
IOWR_ALTERA_AVALON_UART_TXDATA(UART1_BASE, rd);
printf("receive:%c\n",rd);
for(i=0;i<50;i++)
{
rd=IORD_ALTERA_AVALON_UART_RXDATA(UART1_BASE);
rc1
=rd;
}
for(i=0;i<50;i++)
printf("%c",rc1);
printf("\n");
return 3*alt_ticks_per_second();
}
int main()
{
if(alt_alarm_start(&alarm1,1000,my_alarm,NULL)<0)
printf("it is error!\n");
}
