Hi All, I have a problem with this code: This simple code sends 0-255 with 9600 baudrate to pc and P2 port My problem is in loop runtime . program crashes when arrived to line :P2=i. so we see '0' only on hyperterminal . I changed type of 'i' to int , but the result remains . All The Best Aziz #include <w78e65.H> #include <stdio.h> main() { unsigned char i; TMOD=0x20; SCON=0x52; TH1=0xfa; TR1=1; for(i=0;i<=255;i++) { printf("%d",i); P2=i; } } /**************************************/
Dear Hans, Regards, This fault have overcame with a delay loop after main() and variable definitions ! Like this : #include <w78e65.H> #include <stdio.h> main() { unsigned char i; for(i=0;i<100;i++) //Delay TMOD=0x20; SCON=0x52; TH1=0xfa; TR1=1; for(i=0;i<=255;i++) { printf("%bd",i); P2=i; } } /**************************************/ Can you tell me why ?
main() { unsigned char i; for(i=0;i<100;i++) //Delay
Dear Hans , My operation clock is 22.1184 MHZ The circuit is simple consist of a cpu and crystal and max232 reducing the 100 caused hanging again ! I checked the serial port . It was OK .
I've seen this before. The MAX chip takes quite a while to pump up its +9/-9V supplies, so you need to wait for it.