Trouble with SD Card tutorial

Iamretired

I was able to run the first example, but not the second.
The second example requires modifications to the first.
The code below includes the changes required.
When I make the changes, I get errors.

/* SD Card Data tutorial
http://learn.parallax.com/propeller-c-simple-devices/sd-card-data
*/

#include "simpletools.h"

int DO = 22, CLK = 23, DI = 24, CS = 25;

int main(void)
{
pause(1000);

sd_mount(DO, CLK, DI, CS);

FILE* fp = fopen("test.txt", "w");

int val = 500; //1 <- add
fprintf(fp, "%d\n", val); //2 <- modify
val = -1000000; //3 <- add
fprintf(fp, "%d\n", val); //4 <- add
fclose(fp);

char s[15]; //5 <- remove
fp = fopen("test.txt", "r");
fread(s, 1, 15,fp); //6 <- remove
//fscanf(fp, "%d", &val); //7 <- add
//printf("val = %d\n", val); //9 <- add
//fscanf(fp, "%d", &val); //9 <- add
//printf("val = %d\n", val); //10 <- add
fclose(fp);

printf("First 21 chars in test.txt:\n"); //11 <- remove
printf("%s", s); //12 <- remove
printf("\n"); //13 <- remove

}
/*
With adds and modify //1 to //6 and removes //11 to //13
not done the following is displayed on terminal window.

First 21 chars in test.txt:
500
-1000000

When adds, modify and removes are done the program will
not compile.
*/

I have looked it over for keying errors and can't find any. I don't know if the code in the
tutorial works or not: I can't copy it to SimpleID to try it.

Please excuse the formatting: I tried to add spaces so that the '//#' line references would
be easier to see. Oh well.

Any ideas?
Johnmb

Rayman

If it won't compile, it should tell you which line number is the problem...
Do you see that?

Andy Lindsay (Parallax)

Will test it, back in a few...

Steph Lindsay

I am new to all of this, learning as I test-drive and format the tutorials. I will re-run that tutorial and see if I inadvertently introduced an error in the example part.

Andy Lindsay (Parallax)

Hmmm, copied and pasted your code over a Save Project As of SD Minimal.side, and then un-commented the lines you added, and re-commented the lines you took out. So, it looks like this (below with a little extra formatting). No compiler errors, and output was correct.

#include "simpletools.h"

int DO = 22, CLK = 23, DI = 24, CS = 25;

int main(void)
{
  pause(1000);

  sd_mount(DO, CLK, DI, CS);

  FILE* fp = fopen("test.txt", "w");

  int val = 500;                                    //1 <- add
  fprintf(fp, "%d\n", val);                       //2 <- modify
  val = -1000000;                                //3 <- add
  fprintf(fp, "%d\n", val);                       //4 <- add
  fclose(fp);

  //char s[15];                                     //5 <- remove
  fp = fopen("test.txt", "r");
  //fread(s, 1, 15,fp);                            //6 <- remove
  //fscanf(fp, "%d", &val);                     //7 <- add
  printf("val = %d\n", val);                     //9 <- add
  fscanf(fp, "%d", &val);                       //9 <- add
  printf("val = %d\n", val);                     //10 <- add
  fclose(fp);

  //printf("First 21 chars in test.txt:\n");     //11 <- remove
  //printf("%s", s); //12 <- remove
  //printf("\n"); //13 <- remove

}

BTW, To start and stop code formatting, use the word code between square brackets [ ]. To end a code snippet, use /code between square brackets.

dgately

I got a compile and run, mod'ing your code with the changes...

What are the compiler errors? You can Right-Click (Control-Click on a Mac) in the compiler 'Build Status' area to select and copy the error log. You may need to click on the Hammer icon near the bottom of the editor to see the Status view.

That will help in debugging what's wrong.


Thanks,

dgately

Andy Lindsay (Parallax)

Thanks dgately. Yes, iamretired, please try that and paste the compiler errors into a post; it'll really help identify the bug.

Iamretired

When I attempt to copy and paste the error, I get the following: ????

#include "simpletools.h"

int DO = 22, CLK = 23, DI = 24, CS = 25;

int main(void)
{
pause(1000);

sd_mount(DO, CLK, DI, CS);

The error message ( typed ) is:

region 'hub' overflowed by 868 bytes

Done. Build Failed!

Your program is too big for the memory model selected in the project.

Jen J.

Moving this thread to the 'Education' forum.

Andy Lindsay (Parallax)

Hmm, sounds like your memory model might be LMM for some reason. Click bottom-left Show Project Manager Button. Then, change Memory Model field from LMM Main RAM to CMM Main RAM Compact. It reduces program size significantly with little or no execution speed penalty. Although the stdio library still takes up some space, I've added a lot of code on top of these examples, but only observed small increments of additional memory used.

Andy

Iamretired

The project options are 'CMM Main Ram Compact' and '-Os Size'.
The compiler options are '32bit Double' and '-stdc99'
The Linker options are 'Mathlib' and '-lsimpletools'

Andy Lindsay (Parallax)

Uncheck Math Lib.

Iamretired

Unchecking Math Lib corrected my problem. Thank you for your time and help. I thought I had tried 'all' combinations.

Johnmb