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29 Threads found on edaboard.com: Delay 1ms
making one milli second delay in 8051 using timer mode is the following programme is correct ? crystal frequency is 20MHz #include void _ms_delay(unsigned int delay) { while(delay != 0) // mult delay { --delay; TMOD = 0x01; // Timer1 (...)
ok ,I feel lazy to check your timer routine, but is it in ms? so effectively making timer(20) a 20ms delay? if yes, your delay values are very wrong, this servo (as most of them) uses a PWM signal of 20ms time span, with a minimun of 0.6ms (-90°) and a maximum pulse width of 2.4ms (+90°) (some servos could go from 1ms to 2ms but my sg90's (...)
I'm pretty sure you problem is just timing... your wait() loop seems too quick (not even 1ms with those 12Mhz). why don't you use the _delay_ms() from util/delay.h ??? anyway... I think your timing even there is very off... as I remember most commands took at least 100ms to execute, and the quickest way to determine that is, instead of (...)
I think your "delay_ms()" routine is wrong. I assume you intend setting up a 1ms delay using the timer and call it 'x' times to set a delay of 'x' mS. At the moment you have a loop that executes 'x' times then calls a single 1ms timer delay. Brian.
With 22MHz the time unit is not 0.5us but roughly 0.545us To get 1ms delay the reload values are: 65536-1835=63701 => F8 D5 (1ms ≈ 1835 * 0.545us) Use Timer 0 of 8051 in MODE1 (16 bit timer) ... delay: MOV TMOD,#00000001B // Sets Timer 0 to MODE1 (16 bit timer) MOV TH0,#0F8H // Loads TH0 register (...)
Hi, With these latest chips multifunction pins its easy to get things wrong when configuring them, however I think for PortC.0 its ok as you have done it, though it might be good practice to turn off the Analogue function in case you use any other Portc pins as Digital inputs. Think your problem is that the ON delay is just 1ms and the OFF ti
I don't know C but from what I understand of it you have not initialized the LCD correctly. To initialize the LCD properly you should send 30H to the LCD wait more than 4.1ms then send 30H again twice more with a minimum gap between instructions of 100uS. Although you have a delay of 10mS in the send data to LCD portb routine it does not need to b
Friend, Am I putting the right code for MCS51 ? I'm using 11.0592Mhz crystal... void delay_ms (void) //1ms delay { TH0=0; TL0=0; TH0 = 0xF8; //1ms delay TL0 = 0xCC; TR0 = 1; while(!TF0); TR0 = 0; TF0 = 0; return; } void delay_100(int j) { int i; for (...)
I think this is cause.... void delay_ms(unsigned int n) generates a delay of n milliseconds. This function automatically resets the wtachdog timer every 1ms by generating the wdr instruction.
As simply as I can say it: The TMR0 register counts upward at a constant speed. The speed is set by the system clock and by the prescaler ratio. TMR0 has 8 bits so it can only hold values from (binary) 00000000 to 11111111 which in decimal is 0 to 255. When it has reached 255 it's next count sets it back to zero again and at the same time a circ
I do not use 'C' but it looks like there is no 20ms delay in your loop
Clock frequency divided by 4 gives instruction cycle time. Multyply by timer prescale value gives timer increment time. Example with 4 Meg clock and 1:8 prescale: Instruction cycle time = 4/4 = 1M; 1/1000000 = 0.000001 seconds Timer increment time = 0.000001 * 8 prescale = 0.000008 seconds; Counts for 1ms = 0.001 / 0.000008 = 125;
delayMs(1); // 1 second delay ??????? Is this 1 second or 1ms delay.
what is your problem? no display in lcd? try to give more delay while command 0x38 some lcd's need to write the 0x38 three times first give 15ms delay and 5ms delay and 1ms delay still error
First, make the delay time about 1ms .. Then, keep in mind that the current to segments has only 25% duty ratio and it is limited by resistors .. You selected 10k and that value is much, much to big .. try something like 100ohms .. IanP :wink:
A new built-in inline function '_delay' (request a delay in instruction cycles) had been offered by HI-TECH C for PIC10/12/16 v9.60+ PRO mode. EX:#include #define _XTAL_FREQ 4e6 // 4MHz void main( void ) { _delay( 1 ); // 1 instruction cycle delay __delay_us( 2 ); // 2 us (...)
hi guys i m a new member and it,s my new post ever in any discussion forum... i m using ?c P89V51RD2FN i just want to start with how to generate a delay using register banks .. plz explain the concept from a zero level... as how to calculate machine cycle, use of crystal frequency which is 11.0592mhz... hex values to be stored in registers,
you can use only like this in PIC the only thing you can reduce the delay from 1 sec to 1 ms or according to your ADC configuration
Sir, I need to design a high speed electromechanical pneumatic valve with 1 mS response time. The electrical specification of the valve is 15v-35v, 200mA, 1ms ON/OFF delay. For the specified voltage rating i have placed a regulator first. Because the coil will operate with 12v pulsated DC supply only. The dc resistance of the coil is 37E and the
Hi guys,is there anyway I could get time delay using D Flip flops?I've tried googling it but all I get is info. on 555 IC timers. What sort of time delay do you want (1ms, 1 min...)?
I need a ckt that has this condition "CPU_+1.2V should supply 1.5ms earlier than CPU_+3.3V" If I have 3.3V from power supply and during Power ON I need to delay it with 1.5ms to supply to CPU as CPU_+3.3V as a requirement of CPU POWER MANAGEMENT. I was looking for an IC that is not microcontroller to avoid increase of budget for the project. (i.e.
Most programs require some type of clock for timing. A common approach is to set up one of the timers to interrupt every 1ms and increment a global variable. You can then have a timer routine. For example: delay_1ms(50); There are plenty of timers in a dsPic. One thing to know about using unsigned ints as timers. You dont have to (...)
Most programs need some kind of clock/timer and one way to implement it is to have a global variable that is incremented in a Timer interrupt routine. You could use Timer 1 and pre-load it so that it interrupts every 1ms. In the interrupt routine, increment the global variable. Use Mplab sim to check the interrupt timing. When using unsigned
you maybe miss a pullup somewhere maybe the + supply is impure??? etc try adding some ceramic caps into the standard circuit right at the mclr pin to decouple imputrious stimuli from the reset vector or add a small delay before i/o pins init this often helps main routine >>delay 1ms ...etc>>registers/pins init actual pins active...
who makes a cheap video delay chips or circuits? I'm looking for a cheap circuit or video delay chips that can take the video signals either VGA,S-video,composite,component,RGB and delay it in milliseconds but how? what are these types of chips and circuits called please? I have a audio delay cicuit that goes from (...)
Hi, anybody have idea how to delay a pulse (1-400Hz @ 12V) from 0.1ms to 1ms?? thanks!
well, uC delay are very Xtal dependent... so in your PIC (I think its PIC16F--- huh?) say, you are using a 4MHz Xtal, just set my reg7 as data variable and use a fixed 1ms delay... delay_1ms: movlw .199 movwf reg7 goto $+1 decfsz reg7 goto $ - .2 RETURN and make another subroutine to (...)
The following code will generate a square wave of approximately 500 Hz on D0 line (Pin 2) of parallel port having address 0x378. For delays smaller than 1ms...i think you need to use assembly language routine for your delay. #include #include void main(void) { char key; while((key = toupper(getch())) != 'Q')
on the feedback type of AGC,How to prevent the delay of the delay of the operation? in sigma delta modulation,decimation and envelope detector will cause some delay. How to prevent it for AGC?