RT Thread Studio LVGL 8.2.0 移植报错

发布于 2022-05-15 02:01:13 浏览：1557 订阅该版

1.芯片STM32F49BIT6 使用外部SDRAM，移植LTDC驱动RGB屏幕三色显示正常。
2.添加LVGL 8.2.0软件包，没有开启任何example和demo均不使能。
3.在applications中新建lvgl文件夹，利用软件包内的5个template移植lv_conf.h;lv_port_disp.h;lv_port_disp.c;lv_port_indev.h;lv_port_indev.c五个文件，在lv_port_disp.c中定义：
```
#define MY_DISP_HOR_RES 800
#define MY_DISP_VER_RES 480

#define LV_VER_RES_MAX  MY_DISP_HOR_RES
```
注释掉
```
//    /* Example for 2) */
//    static lv_disp_draw_buf_t draw_buf_dsc_2;
//    static lv_color_t buf_2_1[MY_DISP_HOR_RES * 10];                        /*A buffer for 10 rows*/
//    static lv_color_t buf_2_2[MY_DISP_HOR_RES * 10];                        /*An other buffer for 10 rows*/
//    lv_disp_draw_buf_init(&draw_buf_dsc_2, buf_2_1, buf_2_2, MY_DISP_HOR_RES * 10);   /*Initialize the display buffer*/
//
//    /* Example for 3) also set disp_drv.full_refresh = 1 below*/
//    static lv_disp_draw_buf_t draw_buf_dsc_3;
//    static lv_color_t buf_3_1[MY_DISP_HOR_RES * MY_DISP_VER_RES];            /*A screen sized buffer*/
//    static lv_color_t buf_3_2[MY_DISP_HOR_RES * MY_DISP_VER_RES];            /*Another screen sized buffer*/
//    lv_disp_draw_buf_init(&draw_buf_dsc_3, buf_3_1, buf_3_2, MY_DISP_VER_RES * LV_VER_RES_MAX);   /*Initialize the display buffer*/

```
4. 编译后报如下错误
```
01:44:36 **** Incremental Build of configuration Debug for project FK-F429BIT6M2-LTDC-LVGL ****
make -j8 all 
linking...
./packages/LVGL-v8.2.0/src/misc/lv_printf.o: In function `rt_snprintf':
E:\workspace\FK_F429M2\FK-F429BIT6M2-LTDC-LVGL\Debug/../packages/LVGL-v8.2.0/src/misc/lv_printf.c:866: multiple definition of `rt_snprintf'
./rt-thread/src/kservice.o:E:\workspace\FK_F429M2\FK-F429BIT6M2-LTDC-LVGL\Debug/../rt-thread/src/kservice.c:1131: first defined here
collect2.exe: error: ld returned 1 exit status
make: *** [makefile:109: rtthread.elf] Error 1
"make -j8 all" terminated with exit code 2. Build might be incomplete.

01:44:39 Build Failed. 3 errors, 0 warnings. (took 2s.654ms)
```
错误定位一下两个函数之间存在重复定义：
```
int lv_snprintf(char * buffer, size_t count, const char * format, ...)
{
    va_list va;
    va_start(va, format);
    const int ret = _vsnprintf(_out_buffer, buffer, count, format, va);
    va_end(va);
    return ret;
}
```
```
int rt_snprintf(char *buf, rt_size_t size, const char *fmt, ...)
{
    rt_int32_t n;
    va_list args;

va_start(args, fmt);
    n = rt_vsnprintf(buf, size, fmt, args);
    va_end(args);

return n;
}
```
5.使用littlevGL2RTT软件包不存在这个问题，后在cubemx修改栈为0x1000问题也没有解决，重复新建工程多次也不行，应该怎么解决？