how to disable EXTI9_IRQn , and enable EXT5_IRQn external interrupt in stm32 simaltanous
E.g. in 'F2xx/'F4xx, EXTI5 and EXTI9 share a single interrupt vector, you can't distinguish them by interrupt number (i.e. at the NVIC level), and you have to enable/disable them at the EXTI level in EXTI_IMR.
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