KEY (EXIT) NOTES¶
Introduction¶
Note
In this section, we will talk about the onboard key on the DNESP32S3M development board, for convenience, the key is not used in block mode but rather in interrupt mode. We use external interrupts to detect the key press. In fact, we are discussing the external interrups, and we use the key to show the effect of external interrupts.
The KEY¶
The Circuit Onboard¶
Dependencies¶
Key Functions¶
| Function Prototype | Explanation | Example |
|---|---|---|
| static void IRAM_ATTR exit_gpio_isr_handler(void *arg) | External interrupt service routine, put the action you want to conduct once an event is detected here | put your actions here |
| esp_err_t gpio_install_isr_service(int intr_alloc_flags) | Install the driver's GPIO ISR service, which allows you to register the ISR handler for the GPIO pin | gpio_install_isr_service(0); |
| esp_err_t gpio_isr_handler_add(gpio_num_t gpio_num, gpio_isr_t isr_handler, void *args) | Add the handler for the GPIO pin | gpio_isr_handler_add(BOOT_INT_GPIO_PIN, exit_gpio_isr_handler, (void*) BOOT_INT_GPIO_PIN); |
| esp_err_t gpio_intr_enable(gpio_num_t gpio_num) | Enable the GPIO interrupt | gpio_intr_enable(BOOT_INT_GPIO_PIN); |
Tip
Once you setup the handler function, you do not need to call the funciton in your main loop, as the interrupt will be triggered automatically once the event is detected.