Store and read data to SD CARD

Peavey5150

How do I save data to a text file from the propeller activity board itself, and then have the propeller activity board read the data back from the SD card after rebooting the system ?


This Project is for machine learning. Robot learns from each trial and would remember data after shut down.



C lang

activity bot 360
propeller activity board wx

Peavey5150

I think I got it from the examples

#include "simpletools.h"                      // Include simpletools header    

int DO = 22, CLK = 23, DI = 24, CS = 25;      // SD card pins on Propeller BOE

int main(void)                                // main function
{
  sd_mount(DO, CLK, DI, CS);                  // Mount SD card

  //FILE* fp = fopen("test.txt", "w");          // Open a file for writing
 int  val ;
// fwrite(&val,sizeof(val),1,fp);
 //val =-100000;
// fwrite(&val,sizeof(val),1,fp);
 // fclose(fp);

 // looks like I just needed to  modify  this line
 FILE* tp = fopen("test.txt", "r");  

 fread(&val,4,1,tp);
 print("val = %d\n" ,val);
 fread(&val,4,1,tp);
 print("val = %d\n",val);
 fclose(tp);
 
 
 
                              // With a newline at the end
}

modEdit: code blocks added

RS_Jim

Nick
Make your code easier to read. In close it between code tags by selecting the "C" from the header and enclosing code between the tags.
Jim

Peavey5150

@RS_Jim
Thanks

Genetix

Peavey5150,

What do you want your ActivityBot to "Learn"?

You will need to create some kind of data format that stores this information and then create code that is able to replay or analyze it.

Also understand that unless you provide your servos a constant voltage they will move slower as the voltage drops so any distance or time record would be inaccurate.

Peavey5150

@Genetix
Thanks for the tips.

I was just missing File*
to read code after shutdown. I got it now.