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39 Threads found on Change Interrupt Pin
wtf? SPI slave shall be done by pin change interrupt!
How to find which on which pin interrupt has occurred of PORTB All four pins interrupt on change pin have single Flag RBIF I studied this document but couldn't understand assembly language Can someone explain in MikroC code PIC 16F887 MikroC
Hello, I try to use interrupt with pic18f14k50. (RA4 pin as IOC pin). But I cant find where I mistake. Anytime doesnt run part of ioc in interrupt routine. Same time I use timer interrupt for 1us. I use internal oscillator 16Mhz. sbit LED0 at LATC4_bit; sbit LED0_Direction at TRISC4_bit; sbit (...)
I have used interrupt on change with a PIC24FJ256GB110 to detect changes on A and B and determine direction using code similar to
Hello. I am Working in The Project which uses ultrasonic sensor for Height Measurement, The Module of Ultrasonic is shown in Pic Modle HC-SR for This w
Dear colegues, I use mikroc pro for arm with lm4f232 tiva C mcu, I need simple solution (I am not close with Tiva C so I need help) I need to read (count) pin change conditions (for example from logical 1 to logical 0) every 10ms that can be done with some interrupt routine, also I need to save count on some array or vector... or (...)
configure port A pin RA4 as input and poll it periodically for change from low to high in main while loop. If the change can occur for very small amount of time then i suggest better use an external interrupt on RB port or external interrupt pin INT, bcoz in this case you need to (...)
There's no pin change interrupt with ATmega8, but you can program one of the two external interrupt pins to be sensitive to both edges. See Datasheet, External interrupts, MCU Control Register MCUR
I don't think there are PICS with more than one INT pin. Still most of them have Interrpt on change for PORTB pins. You can also use CCP modules in the PIC to capture events. As a last resort you can use a 3 input AND gate to tie the three interrupts to the one INT pin of the PIC. Hope this helps :) PS : (...)
Apparently he's referring to PORT B interrupt-on-change feature, provided for PIC16F877 pins B4..B7. Applications are quite obvious and can be found allover the internet. You can e.g. consider a quadrature encoder interface.
I couldn't change the pin because i have designed the pcb and ordered more pcb. All interrupt pins in uC are used for some other purpose. Even i can't change the crystal frequency, because my device is battery operated. If you are locked into using pin RC0 as the button input, (...)
Hi, In a word, yes it would be possible, however you will need to go though your lcd routine as they often change RB0 from input to output along with the other PortB pins. You need to have RB0 totally free of the lcd routine and any TRIS instruction it may use. You need to show the lcd code you are using. On a 40 pin chip like that (...)
You can't use the interrupt on change, as minimum timing requirement is 2TCY, which in your case is 244us. 244us is much greater than 3us, so you can't use that. Use external interrupt where the minimum timing requirement is 20ns. Hope this helps. Tahmid.
many microcontrollers have an "interrupt on change" detection facility where changes in level of a digital IO pin cause an interrupt using a timer you can then count interrupts over a period, e.g. 0.1 of a second
Hey Friends, I'm a beginner to PIC programming. I'm trying to write a simple interrupt routine. I have a LED on RD7 and I would like the LED to flash any time there is a change on pin RB1. My circuit board has a push button switch on RB1. For some reason when I push the switch the interrupt never fires. This is my (...)
i configured portb change interrupt BSF INTCON, GIE BSF INTCON, RBIE BCF OPTION_REG,RBPU so i simulated with Proteus. when I enable the pullup, it automatically interrupt without press the button Hi; It is due the wrong order. First set the used PORTB pin(s) as input via TRISB then clear RBPU to en
Use the PORTB interrupt-on-change for counting number of buttons pushed and to start counting when a button is pushed and until released. For counting number of clock pulses, use the RB0/INT pin. In the interrupt vector, check which interrupt occurred. Hope this helps. Tahmid.
I am having a problem with implementing an IOC using the PIC16F84A where an LED should turn on when a push button is pressed. I can't seem to find as to what causes this problem, here is the code that I made. #include /*CONFIGURATION*/ __CONFIG(FOSC_XT & WDTE_OFF & CP_OFF & PWRTE_OFF); /*pin ASSIGNMENTS*/ #define BUTTON 4
Hi all, I'm using PIC16f1938. I have an issue with interrupt on change. I use RB2 pin to detect the external edge(rising and falling edge). Here is code: ANSB2 = 0; PEIE = 1; TRISB2 = 1; //RB2 is input WPUB2 = 1; //Enabled pull-up IOCIF = 0; //Clear flag interrupt (...)
Hi, You have two different interrupts available on Port B. RB0 which can detect the signal change / transision from high to low or low to high and is reported by the INTF bit. RB4-7 can detect a change of state from 1 to 0 or 0 to 1 on any of those 4 bits and is reported by RBIF. Not aware that the ISR can tell you which of (...)
I have count encoder pulse on interrupt RB0 here. You may change RB0 input to count push button pressed.
The code works the same in single step and in the run mode, if you change the pin state to give an interrupt then you will see that in the next few steps the execution will enter the interrupt. The other way is to use the run as you say and put a breakpoint in the first line of the interrupt so that (...)
Here is RC5 decoder but written for the Pic16F series. As it is C code, it should be easy to change to Pic18F series.
Hi all, can somebody please tell me whats wrong with this code ?! its supposed to be a hardware interrupt test: normal operation : LED1 on, LED2 off when interrupt accurs(INT0 change) : LED1 off, LED2 on I have to mension that my INT0 pin (RB0) is always high unless I push the button (push to break) ... is that a (...)
hi, i thing the problem is with your timer 0 interrupt. a high to low pulse at timer0 pin(port 3.4) will increment the TL0 register by one. only if the number pulses going to cross the maximum timer value you are going to get a interrupt, otherwise only same value will be displayed in your seven segment. change the counetr (...)
Wanting to use MCLR as interrupt port change state - its set high. Prefer to use weak internal pull-up. Tried this: ioc.3=1; intcon.GPIE=1; //enable IOC bit for GP3, then GPIE //in ISR checked for state when button pressed high to low thusly: if (GPIE && intcon.GPIF) //nosuch IRQ not being called The logical port to use would be GP2/ext int p
Hello everyone, I have the following problem: I have many buttons as an input connected to pin RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7 and led in pin RD0 RD1 how to change the interrupt state is not detected? #define PIC_CLK 4000000 #include __CONFIG(1, HS); //for freq>8Mhz and <20Mhz, use XT instead of HS for (...)
The p18f4550 does not have an option register. This register is usually used on the mid range devices to set up the Timer_0/WDT prescaler and the interrupt enables for the int pin, timer0, port b change and their interrupt flags. On the pic18, these have their own registers. Also, never ignore compiler warnings unless (...)
You can put output from encoder to interrupt pin and detect state change. So you can meassure time between pulses to get rpm and use PID algorithm for motor speed control. You can also put timer on overflow on 1/10s and count number of pulses in that time period to calculate RPM. In this manner you will have time delay of 1/10s for feedback (...)
I'm trying to use IOC (interr. on change) in 628, here is the code which works well on simmulator but not on hardware, what I want to do is that LED # 1 lights continiously as power is switched on and as interrupt occur (RB4 goes HIGH ) LED # 1 gets off and LED # 2 lights on and this remains so untill interrupt is not removed. But, what is
Sure HW will be perfect. When cost is an issue, then the SW UART is a solution, especially for high volume products. You don't have to poll, you can use interrupt on pin change if available (most likely RB4-RB7 on Port B), and interrupt on timer.
1. 16x1 led. 2. actually, is not flickering, but is not as bright as i want. 3. just using any pic, with timer 0 enabled and every interrupt i change the pin that drives the next led.
Hello! You can detect edge transition only if the signal arrive to pin with external interrupt or interrupt on change pin (portB). In this case you can use interrupt function. If signal comes to pin C4 you can use only pooling. For reading a input pin (...)
Probably the easiest is to use a pin with an interrupt capability on change (RB0/INT or RB4-7). In the interrupt routine simply increment your counter.
I downloaded the service manual for my 32AX60 Toshiba TV to try to reset it. Some one, (we think) set the password and set the TV on blocking and we cant change input types, only antenna input. I got the chip out and tried touching the rst pin with a ground pin that was separated from the rst pin with an (...)
Hi, You can't. Better use a PIC microcontroller from the 12F6XX series they have a standby current of 1nA :-)... and are able to count your signal by interrupt on change on one I/O pin. and again back to sleep... Paul.
hi.. Search in this site about interfacing ultrasonic sensors u ll get a bunch of information.. Connect the ultrasonic reciever module with the microcontroller.. I mean connect it to a single port pin (I/O).. Keep it on polling or use interrupt concepts for detecting a sensed signal change... The ultrasonic sensor which works within (...)
Salam, It's so easy with External interrupt(Use external pin changed interrupt connected to SW2) to detect if the SW2 is pressed. Bye
Are you triggering the INT on the right edge ? It cannot take 100 clks to get from port pin change to start of INT routine - it looks like your INT is configured for rising edge while you are looking at Falling edge (or Vice versa!) Smokey