Zephyr GPIO Interrupt masking

[krbvroc1]

I have a question related to nRF52840-DK and Zephyr / NCS -

I have a device on an arduino shield that generates an interrupt - the driver provided uses gpio_* functions as follows:

gpio_pin_configure(gpio_dev, IRQ_GPIO_PIN, (GPIO_INPUT | IRQ_GPIO_FLAGS));

gpio_init_callback(&gpio_cb, (gpio_callback_handler_t)(device_isr_callback), BIT(IRQ_GPIO_PIN));

gpio_add_callback(gpio_dev, &gpio_cb);

gpio_pin_interrupt_configure(gpio_dev, IRQ_GPIO_PIN, GPIO_INT_EDGE_RISING);

How do I temporarily enable/disable this interrupt for a critical section of code? I don't understand how to. The zephyr interrupt documentation section talks about configuring using ISR_CONNECT macros, dynamic interrupts, and such. None of that seems to relate to the gpio abstraction used. How does one map between the two? I am not even sure how to figure out what 'IRQ' number is ultimately used behind the scenes.

The IRQ_GPIO_PIN is determined from the dts overlay as such:

 device-irq-gpios = <&arduino_header 14 GPIO_ACTIVE_LOW>; /* D8 */

Does does one mask / enable / disable that interrupt? The gpio abstraction hides all these details.

[Håkon Alseth]

Hi,

 

How do I temporarily enable/disable this interrupt for a critical section of code?

You can use irq_lock() and irq_unlock() to disable all interrupts to run a critical section:

https://docs.zephyrproject.org/latest/reference/kernel/other/interrupts.html#c.irq_lock

 

 

Does does one mask / enable / disable that interrupt? The gpio abstraction hides all these details.

If you want to mask all interrupts, do as above. To disable a specific vector, use irq_disable().

 

The zephyr interrupt documentation section talks about configuring using ISR_CONNECT macros, dynamic interrupts, and such. None of that seems to relate to the gpio abstraction used. How does one map between the two? I am not even sure how to figure out what 'IRQ' number is ultimately used behind the scenes.

 Zephyr's gpio driver has a specific api that you should follow, for portability reasons. the nrfx port file is located here:

https://github.com/nrfconnect/sdk-zephyr/blob/master/drivers/gpio/gpio_nrfx.c#L576

 

The interrupts are handled as described in this section of the zephyr documentation:

https://docs.zephyrproject.org/latest/reference/kernel/other/interrupts.html

 

Kind regards,

Håkon

[msedlak]

Hi,

Regarding your answer - "To disable a specific vector, use irq_disable()." 

Is there a specific way how to find out the argument for the irq_disable() function? Based on the documentation, you should pass the "IRQ line" into this function. What to pass, when you want to disable, for example, IRQ on GPIO 1.1 pin? I couldn't find any relevant explanation...

Thank you.

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