kest_touch_irq.c

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#include <freertos/FreeRTOS.h>
#include <driver/gpio.h>
#include "esp_lcd_touch_gt911.h"
 
#include "kest_error_codes.h"
 
#include "kest_i2c.h"
 
static TaskHandle_t touch_task_handle;
 
static void IRAM_ATTR gt911_isr_handler(void *arg)
{
    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
    vTaskNotifyGiveFromISR(touch_task_handle, &xHigherPriorityTaskWoken);
    if (xHigherPriorityTaskWoken) portYIELD_FROM_ISR();
}
 
static void touch_task(void *arg)
{
    esp_lcd_touch_handle_t tp_handle = (esp_lcd_touch_handle_t)arg;
    
    gpio_install_isr_service(0);
    gpio_isr_handler_add(GPIO_NUM_4, gt911_isr_handler, NULL);
    
    for (;;)
    {
        ulTaskNotifyTake(pdTRUE, portMAX_DELAY); // wait for IRQ
        
        if (xSemaphoreTake(i2c_mutex, pdMS_TO_TICKS(I2C_MASTER_TIMEOUT_MS)) == pdTRUE)
        {
            if (!gpio_get_level(GPIO_NUM_4))
                esp_lcd_touch_read_data(tp_handle);      // safe in task context
            xSemaphoreGive(i2c_mutex);
        }
    }
}
 
void init_touch_task(esp_lcd_touch_handle_t tp_handle)
{
    xTaskCreatePinnedToCore(
        touch_task,
        "gt911_touch",
        4096,
        tp_handle,          // task arg
        5,                  // priority
        &touch_task_handle, // <-- store handle here
        1
    );
}