First off, Sorry for the new thread, my old free email account was bouncing your replies, and by chance i saw your replies through the archived lists. I have since changed e-mail accounts, so there should not be any more of a bounce problem. (i hope)
using sdcc 2.9.0 and mcu8051ide for simulator I am kind of new to C programming and esp the whole embedded 8051 thing. Thank you for all of your input on this matter Hi Putu, > each time the "if( a = a + 1024 )" statement is executed, the value of > a is increased by 1024. Yes, thats what i want, so i can count how many K of bytes have passed. (a==a + 1024) would be true one time if ram_start was at or below 1024 i believe. :) Hi Bodo > if( ( a = a + 1024 ) != 0) is the same as "a" would never be 0. :) I forgot to say that the pointer code was originally from: http://www.esacademy.com/en/library/technical-articles-and-documents/8051-programming/using-pointers-arrays-structures-and-unions-in-8051-c-compilers.html Something indeed is up with testing "a" in the if() statement, as i change the value of 1024 to something else e.g. 124, it makes "a" corrupt. (not count up as expected) Now my new question is, Why would testing the value of variable "a" inside an if() statement change the value of "a" elsewhere? This version i have running in the simulator. code: #include<8052.h> #define RAM_START 0x2100 #define RAM_END 0x3FFF void main(void) { unsigned int a=0; xdata unsigned char *abs_ptr = (xdata unsigned char *) RAM_START; // Initialize pointer to RAM_START for(a = RAM_START; a <= RAM_END; a++) { if(a = a + 1024) { !P3_0; // if true every K toggles led } *abs_ptr = 0x69 ; *abs_ptr++ ; P1 = a; // status of "a" variable on port P1 } _asm ljmp 0 _endasm; // fin. } ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
