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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); } }
"...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)!!