esp-open-rtos/examples/blink/blink.c

/* The classic "blink" example
 *
 * This sample code is in the public domain.
 */
#include "espressif/esp_common.h"
#include "espressif/sdk_private.h"
#include "FreeRTOS.h"
#include "task.h"
#include "esp8266.h"

const int gpio = 14;

/* This task uses the high level GPIO API (esp_gpio.h) to blink an LED.
 *
 * Even though it reads better than the register-level version in blinkenRegisterTask,
 * they compile to the exact same instructions (except gpio_enable also set the output type in
 * the GPIO control register).
 */
void blinkenTask(void *pvParameters)
{
    gpio_enable(gpio, GPIO_OUTPUT);
    while(1) {
        gpio_write(gpio, 1);
        vTaskDelay(1000 / portTICK_RATE_MS);
        gpio_write(gpio, 0);
        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}


/* This task uses all raw register operations to set the pins.

   It's not fully parameterised, as the IOMUX_GPIO# macros involve a non-linear
   mapping from GPIO to IOMUX ports.

   There is no significant performance benefit to this way over the
   blinkenTask version, so it's probably better to use the blinkenTask
   version.

   NOTE: This task isn't enabled by default, see the commented out line in user_init.
*/
void blinkenRegisterTask(void *pvParameters)
{
    GPIO.ENABLE_OUT_SET = BIT(gpio);
    IOMUX_GPIO14 = IOMUX_GPIO14_FUNC_GPIO | IOMUX_PIN_OUTPUT_ENABLE; /* change this line if you change 'gpio' */
    while(1) {
        GPIO.OUT_SET = BIT(gpio);
        vTaskDelay(1000 / portTICK_RATE_MS);
        GPIO.OUT_CLEAR = BIT(gpio);
        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}

void user_init(void)
{
    sdk_uart_div_modify(0, UART_CLK_FREQ / 115200);
    xTaskCreate(blinkenTask, (signed char *)"blinkenTask", 256, NULL, 2, NULL);
    //xTaskCreate(blinkenRegisterTask, (signed char *)"blinkenRegisterTask", 256, NULL, 2, NULL);
}