topic Re: Kinetis assembler instructions in Kinetis Microcontrollers

Kinetis assembler instructions

pvidic — Wed, 31 Jan 2018 19:08:16 GMT

Hi, examining Kinetis bootloader source code I found assembler instruction below:

file cmsis_gcc.h:

__attribute__( ( always_inline ) ) __STATIC_INLINE void __disable_irq(void)
{
__ASM volatile ("cpsid i" : : : "memory");
}

can anyone help me find explanation for the instruction?

mjbcswitzerland — Wed, 31 Jan 2018 22:55:24 GMT

Regards

Mark

BlackNight — Thu, 01 Feb 2018 07:39:44 GMT

"cpsid i" is an assembly instruction to mask (disable) the interrupts on ARM Cortex-M.

About the GNU assembler have a read at

Using as: Top and there is a tuturial and good explanation at ARM GCC Inline Assembler Cookbook

I hope this helps,

Erich