We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
I've written this program for AT89S52 to control a servo.The signal pin of the servo is connected to the P1_0 of the chips and a LED is connected to the P2_7 of the chip.When I turned the circuit on the servo had no response and only the LED have lit up.Please help me to check if there is any mistake in my program.
#include<AT89X52.h> unsigned int PWMHIGH; sbit PWM=P1^0; void timer0 () interrupt 1 { TL0 = (65536- 20000) & 0xFF; //20ms TH0 = ((65536-20000) & 0xFF00) >> 8; TL1 = (65536-PWMHIGH) & 0xFF; //1.5ms TH1 = ((65536-PWMHIGH) & 0xFF00)>>8; PWM = 1; TR1 = 1; } void timer1 () interrupt 3 { PWM = 0; TR1 = 0; } void main() { P2_7=0; IE = 0x8A; // EA, Timer0, Timer 1 // Timer0 , Timer1 Mode1 TMOD= 0x11; PWMHIGH = 1000; // on time //timer turn on TR0 = 1; TF0 = 1; while(1); }
Thanks my friend ....and I am sorry for late in replay ( it's my week end ) . anyway I couldn't stop my self from laugh .. I have tested ur Project1 file and it work very fine ...and I got the right value . very good at this point . I start the program load the source code and run it inside ,and Ooops i got the wrong value again ...what happen here !!!??? is there a good logical reason for that pls
My friend the best command in basic was GoTo .... I used it in many ways ...I like this command ,it is the best .
My friend the best command in basic was GoTo .... I used it in many ways ...I like this command ,it is the best
Go on then. What stops you from rushing back to your stomping gound, BASIC?
Nothing stops you from only having a main(), and build the program flow with if and goto. Maybe you could inline code for most of the CRTL functions too, to avoid having to make function calls out of main().
some may not realize you are facetious, (I hope and assume you are)
Erik
A former (female) lecturer (she was a gorgeous babe by the way, not that it matters here. 50% of the class was drooling during classes, including me :-) ) once told us poor students that she has to give an "F" to two other students that handed in a paper in which they replaced the entire contents of a C++ program with a macro called "I love C much more".
Don't everyone have a policy to use at least one goto/hour ;)
I added the reference to replacing the CRTL with inlined goto designs to give a little bit of a hint that goto may not be the best invention in the world.
I'm of the opinion that any repetition in code must be performed with looping constructs (for, while, do ... while), and that any goto construct may only jump forward. This also agrees with the built-in goto-like keywords "continue", "break" and "case".
This reminds me of a CACM letter hmmm www.cs.utexas.edu/.../EWD215.PDF I think it was maybe?
Stephen
Prof. Dijkstra was a great computer scientist indeed. See here:
One of his most famous algorithms: en.wikipedia.org/.../Dijkstra's_algorithm
and about the man:
en.wikipedia.org/.../Edsgar_Dijkstra