Interrupts

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See Interrupt Icon Properties



Most devices have built in interrupts users can call by using the Interrupt flowchart icon.

Interrupts can be used to temporarily pause the operation of the microcontroller and allow something more urgent to happen before continuing where it left off.


Contents

Timer Interrupts

Timer interrupts are useful for monitoring the passage of time. Whether you want something to happen on a regular tick or simply want to measure how long something has taken a timer interrupt can prove to be very handy tool.


Software PWM

Example program showing how to generate software PWM to drive multiple LEDs. Here we have a knight rider effect using eight LEDs. Each LED has a duty value between 0 (off) and 63 (bright on).

FC6 Icon.png Software PWM

SwPWMLEDs.gif

Quadrature Encoder using Timer Based Polling

Example program showing how to use a quadrature encoder component using a polling method via a timer interrupt.

FC6 Icon.png Quad_Encoder_Timer


RGB LED Control using Timer

Example program showing how to control a RGB LED using a timer interrupt to set the LED refresh rate, uses three analogue sliders to set the output colour (PWM duty) of the R, G and B LEDs.

FC6 Icon.png RGB LED Example


INT Single Pin Interrupts

The INT type interrupts allow you to monitor the state of a single port pin.

Normally you can choose if the interrupt macro is called when the port pin state changes on the rising edge or falling edge.


Counting Pulses using INT

Example program showing how to use a single pin interrupt (INT) to count the number of pulses arriving on an input pin.

FC6 Icon.png INT_Pulse_Counter


IOC (Interrupt On Change) Multiple Pin Interrupts

The IOC type interrupts allow you to monitor the state of a number of port pins.

Different chips have different levels of IOC support ranging from a few pins on the chip to all of the pins.

Chips with advanced IOC support allow you to choose the pins you wish to use using the IOC interrupt properties.

If any of the enabled pins change state then the interrupt macro is triggered.


Quadrature Encoder using IOC

Example program showing how to use a quadrature encoder component using a interrupt on pin state change interrupt (IOC).

FC6 Icon.png Quad_Encoder_IOC


Counting Multiple Pulses using IOC

Example program showing how to use a interrupt on pin state change interrupt (IOC) to individually count the number of pulses arriving on input pins.

FC6 Icon.png IOC_Pulse_Counter


RXINT UART Receive Interrupts

The RXINT interrupt allows the interrupt macro to be called whenever a byte is received by a hardware UART channel.


Communications Bridge Using UART RXINT

Example program to listen for incoming bytes on the UART, any bytes that are received are placed into the circular buffer ready to be processed. In this case forwarded onto a computer using the USB serial connection.

FC6 Icon.png UART to USB Serial Data Bridge

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