main/nmi_isr_main.c (nmi_isr sample)

/* * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 */ #include <stdio.h> #include <string.h> #include <inttypes.h> #include "freertos/FreeRTOSConfig.h" #include "freertos/FreeRTOS.h" #include "sdkconfig.h" #include "driver/gpio.h" #include "hal/gpio_ll.h" #include "soc/interrupts.h" #include "example_gpio.h" extern volatile int nmi_triggered; extern void xt_nmi(void*); void app_main(void) { intr_handle_t handle; esp_err_t err; printf("example: Start\n"); gpio_reset_pin(EXAMPLE_GPIO_IN); /* Make sure we have a pull-down on the input GPIO to prevent noise (when disconnected) */ gpio_pulldown_en(EXAMPLE_GPIO_IN); gpio_set_direction(EXAMPLE_GPIO_IN, GPIO_MODE_INPUT_OUTPUT); /* Register the interrupt handler as an NMI. When registering high level interrupts, * the interrupt allocator expects the handler passed as an argument to be NULL. */ err = esp_intr_alloc(ETS_GPIO_INTR_SOURCE, ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_NMI, NULL, NULL, &handle); if (err != ESP_OK) { printf("Failure: could not install NMI ISR, %d(0x%x)\n", err, err); return; } gpio_set_intr_type(EXAMPLE_GPIO_IN, GPIO_INTR_HIGH_LEVEL); gpio_intr_enable(EXAMPLE_GPIO_IN); vTaskDelay(200 / portTICK_PERIOD_MS); /* Disable interrupts on the CPU side and make sure the NMI is still triggered */ const uint32_t mask = esp_cpu_intr_get_enabled_mask(); esp_cpu_intr_disable(0xFFFFFFFF); nmi_triggered = 0; /* Setting EXAMPLE_GPIO_IN to 1 will trigger the NMI interrupt. */ gpio_set_level(EXAMPLE_GPIO_IN, 1); /* Wait for the interrupt to occur */ while (nmi_triggered == 0) { /* We cannot use vTaskDelay since the interrupts are disabled */ } esp_cpu_intr_enable(mask); gpio_intr_disable(EXAMPLE_GPIO_IN); esp_intr_free(handle); printf("example: Success\n"); }