Hello, I am trying to check if addresses bus and data bus are well configured in my external RAM memory. I have done this algorithm
#include <XC164.h> #define low_adress 0x400000; #define high_adress 0x410000; #define high_data 0xFF; #define low_data 0x00; void main (void) { static double idata j,i,k; int xhuge *DIR; DIR = 0x400000; /* DATA BUS TEST */ for (j = low_adress; j <= high_adress; j++) { *DIR = 0x55; // I write 0101 0101 if (*DIR != 0x55) P3^3 = 1; // If what I have read is diferent to what I have written, I switch on an alarm *DIR = 0xAA; // I write 1010 1010 if (*DIR != 0xAA) P3^3 = 1; // If what I have read is diferent to what I have written, I switch on an alarm DIR++; } /* ADRESSES BUS TEST */ DIR = 0x400000; for (i = low_adress; i < high_adress; i = i + 0xFF;) { for (k = low_data; k < high_data ; k++) { *DIR = k; DIR++; } }
but the compiler throws errors. My RAM memory is mapped from 0x400000 to 0x410000 (64kB). Why does the compiler throw this errors?
Build target 'Target 1' assembling START_V2.A66... compiling PruebaRA.c... PRUEBARA.C(17): error C25: syntax error near '=' PRUEBARA.C(17): error C25: syntax error near ';' PRUEBARA.C(17): error C25: syntax error near ')' PRUEBARA.C(20): error C25: syntax error near 'if' PRUEBARA.C(20): error C25: syntax error near 'P3' PRUEBARA.C(20): error C25: syntax error near '=' PRUEBARA.C(22): error C25: syntax error near 'if' PRUEBARA.C(22): error C25: syntax error near 'P3' PRUEBARA.C(22): error C25: syntax error near '=' PRUEBARA.C(24): error C25: syntax error near '}' PRUEBARA.C(29): error C25: syntax error near 'for' PRUEBARA.C(29): error C7: compilation aborted Target not created
Because you haven't understood that #define is handled by the preprocessor and not the compiler (even if the preprocessor may be built into the compiler).
Your #define definitions ends with semicolon.
After replace, yrou code will look like:
for (j = 0x400000;; j <= 0x410000;; j++)
What should the compiler do when it finds four semicolon in the for loop? The standard requires exactly two semicolons.
Remove the semicolons after the #defined symbols, and you will be happier.