A mechanism for the control of program flow in a computer. When interrupted a computer saves it's present operational state and changes to execution of code that is dependent upon which interrupt was generated. Interrupts can be either hardware-sourced or software-sourced; software-sourced ...
0
votes
0answers
16 views
How to use the Non Maskable Interrupt on SAM4S?
I'm trying to use the NMI on a SAM4S (Cortex M4), but I'm finding some hard time to make it work.
The main objective is to jump to the NMI handler whenever the power is about to go down, so that I can ...
1
vote
1answer
34 views
Does Interrupting a Microcontroller Data Receive with a Higher Priority Interrupt Cause Data Loss?
I would like to know what would happen if a Serial Terminal were to send a large amount of data to a PIC/AVR, for example over USART interrupt, which was then interrupted by a higher priority ...
2
votes
2answers
75 views
Reset Interrupt - Beginning or End of ISR?
Im working on a uC that has interrupts configured for various FIFO's present in the uC. Each FIFO is connected to a common bus and can receive data independently(at any point of time). Now, everytime ...
1
vote
1answer
22 views
stm32f207 ethernet interrupts problem
I installed RTX (rtos from Keil) and Ethernet library from STM for stm32f207 MC. I configured UDP using ethernet + LwIP as in examples from STM.
Without RTOS UDP works fine. I send and get packets ...
9
votes
2answers
514 views
Enable interrupt but no ISR
I would like to know what happens if an Interrupt is enabled(ex:Arbitration Lost Interrupt in CAN module of NXP's LPC1778),but no ISR has been defined for the interrupt.
When such an interrupt ...
0
votes
2answers
93 views
STM32: UART Interrupt is triggering without any flags getting set
I am using the UART4 module of an STM32F105. I'm using the RXNE ("RX Buffer Not Empty") interrupt to grab data as it comes in. It's working as expected.
When the RXNE interrupt is enabled it also ...
-2
votes
1answer
57 views
Interrupt programming PIC18F4520 :: Toggling LED
[Edit: replaced sideways photo with upright photo]
I recently started using interrupts in pic programming. I started with this program but I am not able to go through what has been done in this ...
0
votes
2answers
79 views
Difference between FIQ and IRQ
Im working on TI based processors now and they have 2 types of Interrupt configuration(FIQ or IRQ).I have seen such interrupts before when i was doing a hobby project using a LPC1778 but since i didnt ...
1
vote
0answers
51 views
Context Switch without interrupt disabled?
I developing a program on ARM M4 where I don't actually want to disable interrupt even when doing a context switch. If any interrupt occurs during context switch, is it possible to handle it soon ...
2
votes
2answers
64 views
Systick interruption doesn't trigger when handling another interrupt
I am experimenting with the STM32f4 discovery and i tried to use a delay (based on SYSTICK) in an ...
0
votes
2answers
75 views
Sensing Voltage with a Digital Pin
I am relatively new with Arduino and did a little bit of research prior to this post. But I am trying to sense when I have voltage coming from an AC/DC converter (12Vdc) so I can switch from my ...
4
votes
1answer
208 views
UART Interrupt does not get more than one Char - PIC32MX110F106B
I am really struggling with an UART communication with my PIC32MX110F016. It is the first time I am trying to implement an UART communication with PIC32MX family but I find it difficult and I don't ...
1
vote
1answer
107 views
Clearing USART (UART) interrupt flags in an STM32?
I am using an STM32F105 to communicate with a Linx GPS chip using a UART.
If I don't use interrupts (if I just poll the RX flag) then it works just fine. But I'm getting unexpected results when ...
0
votes
1answer
78 views
MSP430 Problem with Multiple Interrupt Timers
I am currently investigating the use of pulse density modulation (PDM) combined PWM (In short, PDM-PWM) as a substitute for conventional PWM in the application of maximum power point tracking (MPPT) ...
0
votes
2answers
52 views
Detecting interrupt on Atmega8 from zero crossing detector circuit
I have a zero crossing detector circuit, whose output I am providing to my Atmega8 as an interrupt, but unfortunately its not working. If I use DC supply 5V (logic 1) as an interrupt, it works.
Where ...
3
votes
1answer
46 views
AVR external interrupt triggering by the falling edge: for how long should I keep signal low to guarantee triggering?
The question header appeared to bee too long. I'm sorry for that.
So I have a schematic generating a short LOW on INT0 pin of ATmega48PA. From the simulation I figured out that the LOW level will be ...
18
votes
2answers
1k views
Should all traps always be defined?
I've seen two cases now with dsPIC 30F4013 where the controller was resetting due to an undefined trap. Why these traps were getting raised in the first place is still a mystery, but that's not my ...
0
votes
2answers
46 views
CAN -> acceptance filter then interrupt or vice versa
I would like to know which occurs first while using CAN communication.
Based on the answer I would conclude whether an acceptance filter must be used in my project or not.
Scenario: There are three ...
1
vote
2answers
60 views
Serial Communication Rx ISR logic design
If im not wrong, an ISR is supposed to do minimal processing when it receives a data serially(via UART).
Im planning on implementing such a protocol for communication between 2 systems via uart.
This ...
0
votes
2answers
58 views
PIC16 10hz timer with timer1 and 1Mhz clock
I need to increment a stopwatch at 10hz using timer1 on a PIC16F628. The external clock is 1Mhz, supplied by a packaged oscillator (EPSON sg8002db). With no prescaler, the value to set the timer to (I ...
0
votes
0answers
19 views
PIC16 timer0 clock calculations
I'm having trouble working out how to implement a timer using timer0 and a 1Mhz clock on a PIC16F628. I thought it would be like this:
clocks/sec = 1000000
counter increments every 4th clocks so ...
1
vote
0answers
47 views
How to set MSP430 Driver Library timerA configurations
I am using MSP430F5529 and MSP430 Driver Library.
As you can see, I set upMode timer configuration, compare mode configuration and enabled the initial interrupts. However, timerA interrupt is not ...
0
votes
1answer
67 views
MCU External Interrupt False Triggering
Above is the picture describing the configuration outside the MCU.
Vin is 0 to 5V Peak to Peak square wave which may have 0 to 50 KHz frequency, or even higher.
The MCU is supposed to handle ...
-1
votes
2answers
57 views
Why are INTERRUPT CONTROLLER SPECIAL REGISTERS in arm different from others? [closed]
For example, in s3c2440, it clears only the bit positions of the SRCPND corresponding to those set to one in the data. The bit positions corresponding to those that are set to 0 in the data remains as ...
0
votes
2answers
137 views
Why does my RTC generate interrupts faster than once per second?
I have configured an RTC module on a uC to generate interrupts every second (~32 kHz module clock with a 0x7FFF prescaler in between the counter and the clock - I hope so, seems like ~32k is the ...
0
votes
2answers
124 views
STM32F407ZET6 and nordic nrf24l01+ communication with interrupt driven SPI
Currently working on STM32F407ZET6 MCU. I am trying to generate an interrupt based SPI communication with nordic nrf24l01+ chipset. The MCU is in Master mode. I am able to establish an SPI ...
2
votes
1answer
113 views
Rx data rate on CAN bus faster than polling rate
I'm working on a safety-critical SIL 4 system and so interrupts have to be kept to a bare minimum (hence using only timer interrupts). CAN is used in polling mode.
Suppose data arrives at a CAN node ...
-1
votes
1answer
78 views
Interrupt INT0 on PIC32MX110F016 not working
I am trying to put the INT0 working in a PIC32MX110F016 but it seems it never goes there.
The INTO pin is Electrically powered with a pull-up resistor and when I press a tactile button it goes from ...
0
votes
1answer
82 views
PIC32mx Timer5 not working
I am struggling to put my Timer5 working properly. I think I have enabled all the registers but the interrupt never occurs. I already put a break point inside in the FingerprintRun() in the asm("nop") ...
0
votes
1answer
67 views
Beagle Bone Black interrupts for optical encoder
I'm trying to have my optical encoder work on interrupts. I found some resources online that discuss it but they all seem to be based on an older version of debian since the files and folders in ...
0
votes
1answer
174 views
Bit Banging UART PIC32mx
I am trying to bit banging an UART Port using PIC32MX with timer5 (the only available at this time) but I am struggling how to configure the timer for a Baud Rate of 115200bps. I don't want a flow ...
5
votes
2answers
388 views
STM32F7 gets stuck in external interrupt callback function
i am working on a project to connect a camera to an STM32F7 Discovery board using the DCMI interface.
The camera part works fine, but i have a strange problem with external interrupts from the ...
0
votes
2answers
108 views
Disable interrupt in ISR on STM32F4
Is is possible to disable an interruption during its service routine to prevent it from happening again for some time?
For example:
...
1
vote
1answer
77 views
How to distinguish between a read and a write in a Harmony USART BufferEventHandler?
I would like to use the Harmony USART driver on a PIC32MX695F512H using interrupts and with buffer support. After setting the appropriate settings in the MPLAB Harmony Configurator, the system has ...
1
vote
1answer
42 views
Latching battery switch triggered by interrupts
I've got an accelerometer with a couple interrupt pins and I've figured out how to get it to fire its interrupts on any change in acceleration or lack thereof for a given duration.
What I want to do ...
1
vote
2answers
246 views
How to simplify UART interrupt handlers on Tiva TM4C with SIMcom 900
UARTIntHandler0 interfaces to the USB UART for debugging.
UARTIntHandler1 interfaces to the SIM900 GSM module.
The purpose of ...
12
votes
4answers
388 views
AVR SEI instruction
The AVR SEI instruction (http://www.atmel.com/webdoc/avrassembler/avrassembler.wb_SEI.html)
waits for the next instruction to finish before enabling interrupts.
If I use another instruction to set ...
0
votes
1answer
88 views
How to remove noise signal on the interrupt pin of micro controller [closed]
My system is interrupt driven, but sometime due to noise signal generates, micro controller treats this signal as an interrupt which is wrong so how can I remove that signal and allow controller to ...
0
votes
1answer
40 views
Is it possible to get two low-voltage interrupts pins on a Atmega328?
Caution: Noob at work :)
I'm trying to get one of two 1.5V-2V signal inputs to trigger an interrupt routine on an Atmega328 (Doc PDF). By using the analog comparator interrupt, I gather I block the ...
0
votes
3answers
70 views
Programmed IO vs interrupt for devices
Although I can understand the difference between programmed IO (PIO) and interrupt (INT) transfers, still there is something vague.
In PIO, the processor repeatedly checks READY pin to see if the ...
2
votes
2answers
75 views
MSP430 how to make configurable ISRs in a module (Code composer studio C)
I have a question that I think the answer to is quite simple. But I've been unable to find a straight answer to.
If i have this service routine in some module foo.c
...
0
votes
0answers
62 views
MFRC522 Interrupt Handling
I am working on a project that reads RFID tags/cards by using MSP430 and MFRC522 module. Module communicates with MSP430 via SPI. It detects cards and reads serial number with polling properly.
...
0
votes
1answer
87 views
How to generate UART interrupt for GPIOs?
I am using PIC32 and I have few inputs. I want a UART Tx Interrupt to fire whenever any input becomes HIGH. I have somehow manged to write code for UART tx and rx ...
1
vote
3answers
87 views
Interrupt-on-Change occurs twice on PIC16F1825
I am having a mind blowing misbehaviour in my PIC16F1825. Basically I am using pin 3 (RA4) to toggle a LED using an Interrupt-on-Change. Problem is, although it toggles the led whenever I press the ...
1
vote
2answers
114 views
Why won't my phototransistor interrupt my microcontroller?
I bought a couple of phototransistors. They all have one lead shorter than the other. I assume that, like normal diodes, this means that the longer lead goes to V+ and the short end goes to GND.
I ...
8
votes
1answer
199 views
enable/disable PCI interrupts
I'm implementing a PCIe driver, and I'd like to understand at what level the interrupts can be or should be enabled/disabled. I intentionally do not specify OS, as I'm assuming it should be relevant ...
1
vote
1answer
39 views
Enhanced 16F PIC: How many instruction periods does automatic_context_save require?
I am about to do my first design with an enhanced 16F PIC microcontroller. I have a question regarding automatic context save & restore that occurs when an Interrupt is triggered.
Specifically, ...
1
vote
1answer
73 views
Sensor has interrupt pins. What can I connect them to?
I have a BMI055 gyroscope and accelerometer. on the sheet there is a section dedicated to the 4 interrupt pins (16,1,12,13 respective to 1,2,3, and 4). This section starts on page 30. and it seems ...
3
votes
2answers
2k views
STM32F4 Cube HAL UART. Is it a bug or am I missing something?
I am using interrupt based UART IO (no DMA).
HAL_UART_Transmit_IT function sets EIE bit in ...
2
votes
1answer
89 views
practical use of NMI in Cortex-M3
So some Cortex-M3 CPUs (and most other small CPUs as well) have a non maskable interrupt.
I know what the NMI does, but I don't quite understand why I ever would want to use one.
I'm looking for ...
