KIR Interrupts.ino: Difference between revisions

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This file contains a number of functions for handling interrupts and related items.
This file contains a number of functions for handling interrupts and related items.


* ''KIR_initPCINT'' - this function initialises the MCU to handle the required PIINTs on the COL pins only. Col pins are set to INPUT_PULLUP and when a button is pressed the COL pin is pulled low, by the respective ROW pin. The resulting interrupt wakes the MCU up from sleep.
* ''KIR_initPCINT'' - this function initialises the MCU to handle the required PCINTs on the COL pins only. Col pins are set to INPUT_PULLUP and when a button is pressed the COL pin is pulled low, by the respective ROW pin. The resulting interrupt wakes the MCU up from sleep.
* ''KIR_enablePCint'' - this function clears any PCINT flags and enables interrupts for the COL pins.
* ''KIR_enablePCint'' - this function clears any PCINT flags and enables interrupts for the COL pins.
* ''KIR_disablePCint'' - this function clears any PCINT flags and disables interrupts for the COL pins. However, we do not use/call this function and simply disable PCINT every time withing the PCINT ISRs.
* ''KIR_disablePCint'' - this function clears any PCINT flags and disables interrupts for the COL pins. However, we do not use/call this function and simply disable PCINT every time directly within the PCINT ISRs.
* PCINT ISRs - We need to use 2 PCINT ISR vectors to handle interrupts rom the 7 COL pins. Here we record the COL number(1-7), Clear the PCINT flags anddisable further PCINT interrupts for now.
* PCINT ISRs - We need to use 2 PCINT ISR vectors to handle interrupts from the 7 COL pins. Here we record the COL number(1-7), Clear the PCINT flags and disable further PCINT interrupts for now.
* WDT_ISR - not used, but as a precaution we simply disable WDT interrupts if ever called.
* WDT_ISR - not used, but as a precaution we simply disable WDT interrupts if ever called.


Revision as of 08:19, 9 October 2019

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This file contains a number of functions for handling interrupts and related items.

  • KIR_initPCINT - this function initialises the MCU to handle the required PCINTs on the COL pins only. Col pins are set to INPUT_PULLUP and when a button is pressed the COL pin is pulled low, by the respective ROW pin. The resulting interrupt wakes the MCU up from sleep.
  • KIR_enablePCint - this function clears any PCINT flags and enables interrupts for the COL pins.
  • KIR_disablePCint - this function clears any PCINT flags and disables interrupts for the COL pins. However, we do not use/call this function and simply disable PCINT every time directly within the PCINT ISRs.
  • PCINT ISRs - We need to use 2 PCINT ISR vectors to handle interrupts from the 7 COL pins. Here we record the COL number(1-7), Clear the PCINT flags and disable further PCINT interrupts for now.
  • WDT_ISR - not used, but as a precaution we simply disable WDT interrupts if ever called.



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