i.MX8MM M4 core - Is it safe to use GPIO_PinSetInterruptConfig() inside ISR to change Rising/Falling

paulw2 — Wed, 09 Mar 2022 16:45:14 GMT

Hi,

Is it safe to use GPIO_PinSetInterruptConfig() inside GPIO4_Combined_0_15_IRQHandler() to change Rising/Falling state of GPIO's already configured for interrupts ?

The idea is that a GPIO pin is initially configured to trigger an interrupt on a rising edge, then inside the ISR it is reconfigured to trigger an interrupt on a falling edge.

The following (incomplete) code snippet illustrates the intent, the GPIO pins are configured elsewhere.

Is there a better and/or more complete way to do this ?

static volatile bool gpio_one_FallingEdge = true; static volatile bool gpio_two_FallingEdge = true; void GPIO4_Combined_0_15_IRQHandler(void){ uint32_t interruptFlags; interruptFlags = GPIO_PortGetInterruptFlags(GPIO4); if (interruptFlags & GPIO4_IO01_GPIO_PIN_MASK) { invertFallingRisingEdge(1); GPIO_PortClearInterruptFlags(GPIO4, 1U << 1U); } if (interruptFlags & GPIO4_IO02_GPIO_PIN_MASK) { invertFallingRisingEdge(2); GPIO_PortClearInterruptFlags(GPIO4, 1U << 2U); } /* * Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping * exception return operation might vector to incorrect interrupt. * * defined in core_cm4.h:71 */ #if defined __CORTEX_M && (__CORTEX_M == 4U || __CORTEX_M == 7U) __DSB(); #endif } void invertFallingRisingEdge(uint32_t gpio_pin) { /* * Invert the direction of signal required to generate an interrupt * gpio_pin is the GPIO pin that caused the interrupt. */ if (gpio_pin == 1) { if (gpio_one_FallingEdge) { GPIO_PinSetInterruptConfig(GPIO4, gpio_pin, kGPIO_IntRisingEdge); gpio_one_FallingEdge = false; } else { GPIO_PinSetInterruptConfig(GPIO4, gpio_pin, kGPIO_IntFallingEdge); gpio_one_FallingEdge = true; } } if (gpio_pin == 2) { if (gpio_two_FallingEdge) { GPIO_PinSetInterruptConfig(GPIO4, gpio_pin, kGPIO_IntRisingEdge); gpio_two_FallingEdge = false; } else { GPIO_PinSetInterruptConfig(GPIO4, gpio_pin, kGPIO_IntFallingEdge); gpio_two_FallingEdge = true; } } }

Thanks.

i.MX Processorsのトピックi.MX8MM M4 core - Is it safe to use GPIO_PinSetInterruptConfig() inside ISR to change Rising/Falling

i.MX8MM M4 core - Is it safe to use GPIO_PinSetInterruptConfig() inside ISR to change Rising/Falling