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Jul 23, 2024 · Fundamentals
Understanding __disable_irq() and __enable_irq() Intrinsic Functions in ARM Cortex-M
The article explains that __disable_irq() and __enable_irq() are compiler‑provided intrinsics that expand to CPSID i and CPSIE i instructions, return the prior PRIMASK state, globally mask CPU interrupt handling without stopping hardware events, and contrasts them with CMSIS __NVIC_DisableIRQ/EnableIRQ which control individual interrupt lines.
ARMC++Interrupt
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