Hello.
I’m new comer in PRU programming. I have built PRU example PRU_RPMsg_Echo_Interrupt0 and loaded to Sitara PRU0. In general case this sample work when I manually send following command “echo hello > /dev/rpmsg_pru30” and “cat /dev/rpmsg_pru30”. After that I decided to write small test program which send data to PRU and reading back:
#include <stdio.h>
#include <stdlib.h>
// Driver header file
//#include “prussdrv.h”
//#include “pruss_intc_mapping.h”
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#define DEVICE_PATH “/dev/rpmsg_pru30”
#define GET_MSG_ID 0x4745544D
#define PRU_BUFF_SIZE 256
int sig_stop; // сигнал завершения работы программы
static void sign_term(int sig)
{
switch(sig){
case SIGTERM:
sig_stop=1;
break;
}
}
int main(int argc, char *argv)
{
int fd;
char data_buff[513];
uint32_t send_data=GET_MSG_ID;
fd=open(DEVICE_PATH,O_RDWR);
int ret;
FILE data_file=fopen(“balisa.bin”,“wb+”);
int start_write;
start_write=0;
sig_stop=0;
int total_recv_bytes=0;
if(fd>0 && data_file!=0){
printf(“Program started\n”); fflush(stdout);
while(sig_stop==0){
ret=write(fd,&send_data,4);
if(ret!=4){
printf(“Failed send data to PRU\n”); fflush(stdout);
}
ret=read(fd,data_buff,sizeof(data_buff));
if(ret<PRU_BUFF_SIZE && start_write==0){ start_write=1;}
if(ret==PRU_BUFF_SIZE && start_write==1){
printf(“RPMSG buffer overflow\n”); fflush(stdout);
}
if(start_write==1 && ret>0){
total_recv_bytes+=ret;
printf(“Start writing %d. Total bytes %d\n”,ret,total_recv_bytes); fflush(stdout);
fwrite(data_buff,1,ret,data_file);
fflush(data_file);
}
}
}
printf(“Program finished\n”); fflush(stdout);
if(data_file!=0){fclose(data_file);}
if(fd>0){close(fd);}
return 0;
}
In first 15 seconds program is workin fine, but the system hang up.
Could you help me in this issue?
My board - beaglebone black.
My Linux based on 4.4.16
PRU compiller from CCS 6.1.3
I’ve made small ivestigation (added usleep to my loop) and found interesting thing - hang up happened when I send/recieve about 262220…262600 bytes from PRU. Withot usleep it’s happened earlier.
Thank you