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I'm trying to use a __set_BASEPRI() function in Keil to set up interrupts in STM32F407 but it doesn't work when I compile the code and the IDE shows warning "implicit declaration of function '__set_BASEPRI' is invalid in C99". Functions __enable_irq() and __disable_irq() work fine. How do I make it work?

Also weird, when I click on "Go to definition" on all these functions, the IDE cannot find the source file for them even though cmsis_armcc.h is included in the project.

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  • \$\begingroup\$ Do a text file search for "__set_BASEPRI" in all the .h file you have at disposal. Probably you will gather some info. \$\endgroup\$ Commented Mar 10, 2020 at 7:16
  • \$\begingroup\$ @linuxfansaysReinstateMonica its included in cmsis_armcc.h, cmsis_armclang.h and cmsis_gcc.h. The former is included in my project. \$\endgroup\$ Commented Mar 10, 2020 at 8:03

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__get_BASEPRI() is defined in cmsis_armcc.h, but only if __TARGET_ARCH_7E_M (ARMv7-M, Cortex-M3) or __TARGET_ARCH_7E_M (ARMv7E-M, Cortex-M4, M7) is defined. The BASEPRI special register is not supported in ARMv6-M, Cortex-M0, M0+, and M1. Make sure you have the correct device selected in the Options for Target dialog.

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That usually happens when the prototype is not included. Have you included the relevant .h file?

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    \$\begingroup\$ Keil includes cmsis_armcc.h automatically. Including it manually doesn't fix the problem. I also tried a fresh Keil install on another PC and everything works fine, so this is probably an IDE problem, not my code. Reinstalling Keil on my PC didn't help. \$\endgroup\$ Commented Mar 10, 2020 at 8:04
  • \$\begingroup\$ @Archimedes If a re-install did not fix it on your machine but did on another, that suggests something is "left behind" in the registry \$\endgroup\$ Commented Mar 10, 2020 at 15:35
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The problem lied in a compiler I was using. By default Keil uses ARMCC (default compiler 5). When I switched to ARMCLANG (default compiler 6), the problem resolved.

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