RT-Thread--LCD 驱动程序模板

RT-Thread 中 LCD 设备被注册为图形设备，其驱动模板如下

/*
 * Copyright (c) 2006-2020, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-02-22     tyustli      first version
 */

#include "rtconfig.h"

#ifdef BSP_USING_LCD
#include "board.h"

rt_uint8_t                lcd_framebuffer[LCD_FRAMEBUFFER_SIZE];

struct drv_lcd_device
{
    struct rt_device parent;

    struct rt_device_graphic_info lcd_info;
    struct rt_semaphore lcd_lock;
};
static struct drv_lcd_device _lcd;

static rt_err_t drv_lcd_init(struct rt_device *device)
{
    /* init your display */

    return RT_EOK;
}

void lcd_update_isr(void)
{
    rt_interrupt_enter();

    rt_sem_release(&_lcd.lcd_lock);

    rt_interrupt_leave();
}

static rt_err_t drv_lcd_control(struct rt_device *device, int cmd, void *args)
{
    struct drv_lcd_device *lcd = rt_list_entry(device, struct drv_lcd_device, parent);

    switch (cmd)
    {
    case RTGRAPHIC_CTRL_RECT_UPDATE:
    {
        /* 等待上一次 lcd 刷屏完成 一般刷屏完成会有一个中断或者回调函数 */
        rt_sem_take(&_lcd.lcd_lock, RT_WAITING_FOREVER);
        /* update your lcd */
        lcd_framebuffer_update(lcd_framebuffer, LCD_FRAMEBUFFER_SIZE);
    }
    break;

    case RTGRAPHIC_CTRL_GET_INFO:
    {
        struct rt_device_graphic_info *info = (struct rt_device_graphic_info *)args;
        RT_ASSERT(info != RT_NULL);
        info->pixel_format = lcd->lcd_info.pixel_format;
        info->bits_per_pixel = lcd->lcd_info.bits_per_pixel;
        info->width = lcd->lcd_info.width;
        info->height = lcd->lcd_info.height;
        info->framebuffer = lcd_framebuffer;
    }
    break;
    }

    return RT_EOK;
}

static int rt_hw_lcd_init(void)
{
    rt_err_t result = RT_EOK;
    struct rt_device *device = &_lcd.parent;

    /* config LCD dev info */
    _lcd.lcd_info.height = LCD_HEIGHT;
    _lcd.lcd_info.width = LCD_WIDTH;
    _lcd.lcd_info.bits_per_pixel = LCD_BITS_PER_PIXEL;
    _lcd.lcd_info.pixel_format = LCD_PIXEL_FORMAT;
    _lcd.lcd_info.framebuffer = (void *)lcd_framebuffer; /* the frame buffer address */

    result = rt_sem_init(&_lcd.lcd_lock, "led_lock", 1, RT_IPC_FLAG_FIFO);
    if (result != RT_EOK)
    {
        rt_kprintf("init lcd lock failed\r\n");
    }

    device->type = RT_Device_Class_Graphic;

#ifdef RT_USING_DEVICE_OPS
    device->ops = &lcd_ops;
#else
    device->init = drv_lcd_init;
    device->control = drv_lcd_control;
    result = rt_device_register(device, "lcd", RT_DEVICE_FLAG_RDWR);
    if (result != RT_EOK)
    {
        rt_kprintf("register lcd device failed\r\n");
    }
#endif
    return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_lcd_init);

#endif /* BSP_USING_LCD */

LCD 测试程序