среда, 24 августа 2016 г., 14:45:54 UTC+4 пользователь Viktor Butckikh
написал:
>
> 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
>
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