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Dtynin

•Created by Dtynin on 9/12/2024 in #firmware-and-baremetal

Compile-Time Check for Node Limit in Custom Communication Function for PIC16F84A

Hey everyone, I’m working in Microchip Studio to create a custom communication function for a few PIC16F84A microcontrollers. I know there are built-in options like SPI, but I’m going the DIY route to learn more about the nitty-gritty of how this all works. Here’s what I’ve come up with so far:

void sendMessage(uint8_t node, uint8_t data);

void sendMessage(uint8_t node, uint8_t data);

Now, my setup only supports up to 4 nodes, so I want to make sure the node parameter doesn’t go above 4. Right now, I just have a simple runtime check:

if (node > 4) { return; }

if (node > 4) { return; }

But I’m thinking it’d be better to enforce this at compile time instead of waiting for runtime. This could make the code safer, maybe even run a bit faster. I haven’t tried anything specific yet, but I’m curious if there are any cool tricks or language features I could use for this, like static assertions or compile-time constants. Anyone out there tried something similar or have any tips?

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