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Hard Fault Interrupt Handler Function – KBA86934 | Cypress Semiconductor

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Hard Fault Interrupt Handler Function – KBA86934

Last Updated: March 27, 2014

How can you write a hard fault interrupt handler function using the default interrupt handler for your PSoC® 5LP project?


Hard fault is an always-enabled exception that occurs because of an error during normal or exception processing. Hard fault has a fixed priority of ‘–1’, meaning it has higher priority than any exception with configurable priority. The interrupt number given for the hard fault interrupt in the PSoC 4 and PSoC 5LP exception table is ‘3’.

The API CyIntSetSysVector() is used for setting interrupt vectors for the system interrupt with the specified number. HFI_Handler is the name of the user defined ISR routine for a hard fault exception. The C code for the hard fault ISR routine can be written by adding the code shown below into your main.c file:

CyIntSetSysVector(3,HFI_Handler); //add this statement to your main( )

Now you can write your own ISR in the main.c file as shown below:

//Your code here
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