I want to have a simple program to print something out using hyperterminal. Also it would be nice to receive a character and echo it back. I have been able to do this in assembly but I can't get it to work in C. Here is the latest code I have tried:
#include <AT89X51.H> #include <CTYPE.H> #include <STDIO.H> int i; void main() { SCON = 0x50; //SCON: mode 1, 8-bit UART, enable rcvr TMOD = 0x20; //TMOD: timer 1, mode 2, 8-bit reload TH1 = 0xFD; //TH1: reload value for 9600 baud @ 11.0592MHz TR1 = 1; //TR1: timer 1 run TI = 1; //TI: set TI to send first char of UART while (1) { P1 ^= 0x01; printf ("\n\nHello World\n\n"); i = _getkey(); putchar('$'); putchar(i); } }
I included <stdio.h> in my code. I found the declarations in that header file. Will this take care of that problem. Also do I need to add the header files I use to my source group or another group on the left of the window? Thanks for the help. Jake
"...do I need to add the header files..." No, you don't need to add them. However, you might find it useful to add them; eg, to give quick access to open a frequently-used header. In that case, you'd need to clear the 'Include in Build' option - otherwise uVision will try to separately compile your header(s)!!
stdio.h will do. You can understand the #include - control as a substitute of pasting the Text of the included File into the including module. The preprocessor of C doesn't anything else. If you costumize the functions, you must add your custom object file(s) to the list of objects to be linked. You're maybe talking about the "left window" of your IDE. I don't use an IDE for 8051 Projects. I just hack the text into files, using a text editor. Then invoke compiler and linker directly via Windows-Explorer and entries in the Registry:
[HKEY_CLASSES_ROOT\c_auto_file\shell\C51-Compiler_Emulator\command] @="C:\\C51\\BIN\\C51.EXE %1 DEFINE ( TEST_CODE = 1 ) OE PP"