How to write interrupts for PIC24 microcontroller under XC16

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How to write interrupts for PIC24 microcontroller under XC16 [Copy link]

Can an expert please tell me how to write interrupt for PIC24 microcontroller under xc16? What is the format? Thank you!

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In Microchip's PIC24 series microcontrollers, writing an interrupt service routine (ISR) using the XC16 compiler usually involves the following steps and format. The following is a basic guide and example:

1. Configure interrupts

First, you need to configure and enable the required interrupts in your code. This is usually done in the initialization code section, by configuring specific registers.

For example, if you want to configure and enable an external interrupt (such as INT1), you might need to:

• Clear the interrupt flag (if it is set)
• Configure the corresponding interrupt priority (if necessary)
• Enable this interrupt in the interrupt controller

2. Write an Interrupt Service Routine (ISR)

An interrupt service routine is a special function that will be automatically called by the hardware when the corresponding interrupt is triggered. In XC16, you need to use a specific keyword to identify this function as an interrupt service routine.

3. Link script and interrupt vector table

In some PIC24 models, you may also need to manually define the interrupt vector table and link it into your code. The interrupt vector table is a table containing the addresses of all interrupt service routines. When an interrupt is triggered, the hardware consults this table to determine which interrupt service routine should be called. However, in many modern PIC24 models and tool chains, this table is automatically generated and you do not need to define it manually.

4. Testing and debugging

Finally, you need to test your interrupt service routine to make sure it works as expected. You can test your interrupt service routine by triggering the corresponding interrupt (for example, through an external signal or software simulation). Using a debugger can help you view the values of registers, step through the code, and check whether the interrupt is triggered and handled as expected.