Store the data on the EPCS4！！

[Altera_Forum]

Hello ,I want to keep the data to the EPCS4,following is the process:# include <stdio.h># include <unistd.h># include "system.h"# include "alt_types.h"# include "sys/alt_flash.h" # include "sys/alt_flash_dev.h"# include "altera_avalon_epcs_flash_controller.h" 

alt_u8 epcsbuf[32]="123456789"; int ret_code,i; int number_of_regions; alt_flash_fd* my_epcs; flash_region* regions; int main (void) __attribute__ ((weak, alias ("alt_main"))); int alt_main(void) { my_epcs = alt_flash_open_dev("/dev/epcs_flash_controller"); ret_code = alt_epcs_flash_get_info (my_epcs, &regions, &number_of_regions); if(my_epcs)  {   ret_code = alt_epcs_flash_erase_block(my_epcs, 0x70000); ret_code = alt_epcs_flash_write(my_epcs, 0x70000, epcsbuf, 10);  for(i=0;i<10;i++) epcsbuf[i]=0;   ret_code = alt_epcs_flash_read(my_epcs, 0x70000, epcsbuf, 10);    }  while(1) { } return 0; }     Why is red part of the function return value is 0?And the address of the EPCS4 is absolutely correct.

[Altera_Forum]

What about the name? Are you sure that the controller name is /dev/epcs_flash_controller ? You can look for it in your system.h

[Altera_Forum]

you can pick up the macro EPCS_NAME (something like that) from your system.h