Color wheel gradient

General discussion
1

I am studying examples of obtaining gradients

Draw Descriptors - LVGL 9.3 documentation

LVGL_gradient
LVGL_gradient482×514 13.5 KB

I wanted to get an image on the display in the form of a color wheel

19-01-Color-Wheel-825x340
19-01-Color-Wheel-825x340825×340 39.7 KB

I wrote this code

// Color wheel
void create_color_wheel(void)
{
    static lv_style_t style;
    lv_style_init(&style);

    // Defining colors for the gradient
    static lv_color_t grad_colors[2] = {
        //     LV_COLOR_MAKE(0x9B, 0x18, 0x42),  // Violet
        //     LV_COLOR_MAKE(0x00, 0x00, 0x00),  // Black
    };

    // static lv_color_t grad_colors[3] = {
    LV_COLOR_MAKE(0xFF, 0x00, 0x00),  // Red
    LV_COLOR_MAKE(0xFF, 0x7F, 0x00),  // Orange
    LV_COLOR_MAKE(0xFF, 0xFF, 0x00),  // Yellow
    // };

    // static lv_color_t grad_colors[7] = {
    //     LV_COLOR_MAKE(0xFF, 0x00, 0x00),  // Red
    //     LV_COLOR_MAKE(0xFF, 0x7F, 0x00),  // Orange
    //     LV_COLOR_MAKE(0xFF, 0xFF, 0x00),  // Yellow
    //     LV_COLOR_MAKE(0x00, 0xFF, 0x00),  // Green
    //     LV_COLOR_MAKE(0x00, 0x00, 0xFF),  // Blue
    //     LV_COLOR_MAKE(0x4B, 0x00, 0x82),  // Dark Blue
    //     LV_COLOR_MAKE(0x8B, 0x00, 0x8B),  // Violet
    // };

    // Create params of gradient
    static lv_grad_dsc_t grad;
    lv_grad_init_stops(&grad, grad_colors, NULL, NULL, sizeof(grad_colors) / sizeof(lv_color_t));

    // Create radial gradient
    lv_grad_radial_init(&grad, LV_GRAD_CENTER, LV_GRAD_CENTER, LV_GRAD_RIGHT, LV_GRAD_BOTTOM, LV_GRAD_EXTEND_PAD);

    // Set fradient as fone
    lv_style_set_bg_grad(&style, &grad);

    // Create an object with a new style
    lv_obj_t * obj = lv_obj_create(lv_scr_act());  // Create an object on the active screen
    lv_obj_add_style(obj, &style, 0);  // Add style
    lv_obj_set_size(obj, 400, 400);  // Set size
    lv_obj_center(obj);  // Center the object on the screen
}

But apparently the function

lv_grad_radial_init

does not accept more than two colors.
The code is loaded into the device and it enters a cyclic reboot.
What am I doing wrong?