I'm trying to attach an interrupt to a GPIO pin, so it is fired when i press a button, which action is to toggle a LED. Code is run on my udo-neo-full M4 core In FreeRTOS you have to set a struct like this gpio_config_t gpioInput = { "INPUT_GPIO", &IOMUXC_SW_MUX_CTL_PAD_SD4_DATA0, 5, &IOMUXC_SW_PAD_CTL_PAD_SD4_DATA0, IOMUXC_SW_PAD_CTL_PAD_SD4_DATA0_DSE(6)| IOMUXC_SW_PAD_CTL_PAD_SD4_DATA0_SPEED(2)| IOMUXC_SW_PAD_CTL_PAD_SD4_DATA0_PKE_MASK, GPIO6, 14 //Pin 39 on J5} #define BOARD_GPIO_INPUT (&gpioInput) //just a label and then I do: static void GPIO_Ctrl_InitInput() { // struct to describe pin gpio_init_config_t inputInit = { .pin = BOARD_GPIO_INPUT->pin, .direction = gpioDigitalInput, .interruptMode = gpioIntRisingEdge //gpioIntFallingEdge }; // Use struct to set GPIO GPIO_Init(BOARD_GPIO_INPUT->base, &inputInit); GPIO_SetPinIntMode(BOARD_GPIO_INPUT->base, BOARD_GPIO_INPUT->pin, true); GPIO_SetIntEdgeSelect(BOARD_GPIO_INPUT->base, BOARD_GPIO_INPUT->pin, true); /* Set GPT interrupt priority 3 */ NVIC_SetPriority(BOARD_GPIO_INPUT_IRQ_NUM, 3); NVIC_EnableIRQ(BOARD_GPIO_INPUT_IRQ_NUM);} Now, in order to associate a handler to the interrupt, I think i must rewrite the GPIO handler that FreeRTOS has for this pin,which is by default a weak function so the linker uses my function instead of the default one (which is a trivial)(this is the only way i see to "attach" my function to a pin). For my GPIO pin, I think this should be GPIO6_Combined_0_15_Handler: void GPIO6_Combined_0_15_Handler(void) { BaseType_t xHigherPriorityTaskWoken = pdFALSE; /* Clear the interrupt state */ GPIO_ClearStatusFlag(BOARD_GPIO_INPUT->base, BOARD_GPIO_INPUT->pin); bLedOn = true; /* Unlock the task to process the event. */ xSemaphoreGiveFromISR(xSemaphore, &xHigherPriorityTaskWoken); /* Perform a context switch to wake the higher priority task. */ portYIELD_FROM_ISR(xHigherPriorityTaskWoken);} but I' m not sure if this handler is called when I press button, because LED does not change,and when I put a "printf" in the handler nothing is shown on UART2 (other messages appear.UART2 is connected to M4 core).Sometimes, it only prints something once,the first time I press the button. Then, never gets called again. Sometimes, nothing is print. Does somebody know how an interrupt is attached to a GPIO pin with udoo FreeRTOS? Thank you
