Sorry if this is a dumb question, I am new to PX4 and cmake.
I am trying to add a driver for a propeller rpm sensor: I have modeled the code and makefile off another driver and placed them in src/drivers/rpm, but it seems like they are not being "seen" by the compiler. In the build folder, there is no build/src/drivers/rpm folder like there is for all the other drivers and the main function does not show up in build/src/firmware/nuttx/builtin_commands.c.
What am I missing? Thanks in advance.