Multi-cycle instructions can be halted with no overhead and then resumed once the interrupt has finished. This interrupt latency is fully deterministic so from any point in the background (non-interrupt) code you will enter the interrupt with the same latency. The NVIC is designed for fast and efficient interrupt handling on a Cortex-M4 you will reach the first line of C code in your interrupt routine after 12 cycles for a zero wait state memory system. Handler for pins connected to line 10 to 15 Handler for pins connected to line 5 to 9 STM32F4 has 7 interrupt handlers for GPIO pins. See the reference manual of the STM32 family that you need to use. Port PinsĪTTENTION: in reality in the Cortex-Mx (STM32) we don’t have 16 external interrupt line, normally there are many less. IMPORTANT: You can not use two pins on one line simultaneously.īelow there is an example of Interrupt pins, consult your STM32 Manual. All pins with same number are connected to line with same number.Įach line can trigger an interrupt on rising, falling or rising_falling edge on signal.
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