lvgl从8.2版本升级到9.1版本产生SCB_CFSR_UFSR:0x100 UNALIGNED问题

发布于 2024-07-08 15:39:49 浏览：469 订阅该版

使用sthm32h7b0，推`800*480`的TFT屏，采用RGB565颜色空间。运行测试函数`lv_demo_widgets()`，在lvgl8.2下能够正常工作。

lvgl从8.2版本升级到9.1版本后，在修改了对应的驱动文件后，运行lv_demo_widgets函数下的lv_theme_default_init函数，出现hardfault。

```
msh />psr: 0x01000000
r00: 0x0000000f
r01: 0x08084d7f
r02: 0x00000000
r03: 0x08084d70
r04: 0x240c21a4
r05: 0x240c21a0
r06: 0x240c219c
r07: 0xdeadbeef
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0x00000000
 lr: 0x08029019
 pc: 0x08043636
hard fault on thread: LVGL

rt_thread_ thread   pri  status      sp     stack size max used left tick  error
---------- -------- ---  ------- ---------- ----------  ------  ---------- ---
0x240cc338 wav_p     15  suspend 0x000000c4 0x00000800    09%   0x0000000a EINTRPT
0x240cba94 k20s imp  16  suspend 0x000000e0 0x00000800    10%   0x0000000a EINTRPT
0x240cb5f0 k20s tx   15  suspend 0x000000a4 0x00000400    16%   0x0000000a EINTRPT
0x240cb14c k20s rx   15  suspend 0x000000b8 0x00000400    17%   0x0000000a EINTRPT
0x240ca4ec k20s imp  16  suspend 0x000000e0 0x00000800    10%   0x0000000a EINTRPT
0x240ca048 k20s tx   15  suspend 0x000000a4 0x00000400    16%   0x0000000a EINTRPT
0x240c9ba4 k20s rx   15  suspend 0x000000b8 0x00000400    17%   0x0000000a EINTRPT
0x240c7744 LVGL      25  running 0x00000048 0x00002000    01%   0x0000000a OK     
0x240c658c tshell    20  suspend 0x000000b8 0x00001000    04%   0x0000000a EINTRPT
0x240bff28 LVGL      25  ready   0x00000048 0x00002000    00%   0x0000000a OK     
0x240c3794 audio     14  suspend 0x000000a8 0x00000400    16%   0x00000001 EINTRPT
0x240024b0 usbd       8  suspend 0x000000c0 0x00001000    04%   0x00000014 EINTRPT
0x240037ac tidle0    31  ready   0x0000004c 0x00000100    29%   0x0000000e OK     
0x240c2470 main      10  suspend 0x00000124 0x00000800    41%   0x00000006 EINTRPT
usage fault:
SCB_CFSR_UFSR:0x100 UNALIGNED 
```

具体定位到lv_palette_main函数，在返回时发生非对齐错误，如下图：

![1.png](https://oss-club.rt-thread.org/uploads/20240708/f456048869e2faca3ac0ed7400d329bc.png.webp)
```
typedef struct {
    uint8_t blue;
    uint8_t green;
    uint8_t red;
} lv_color_t;
```
lv_color_t改成了3字节。return colors[p]；语句运行到，从0x8084d7F地址加载半字到R2寄存器时，产生了hardfault。
SCB->CCR的值为0x70200
请问大家，stm32h7不能够非对齐访问内部的Flash吗？有没有什么办法解决这个问题？