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docs(faq): add "LVGL doesn't start, nothing is drawn on the display" section

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Gabor Kiss-Vamosi
2022-01-15 14:31:23 +01:00
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commit 0388d9218a
1 changed files with 14 additions and 2 deletions
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docs/intro/index.md
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@@ -111,7 +111,8 @@ Starting from v8, every minor release is supported for 1 year.
| v6.1 | Nov 26, 2019 |Nov 26, 2020 | No | | v6.1 | Nov 26, 2019 |Nov 26, 2020 | No |
| v7.11 | Mar 16, 2021 |Mar 16, 2022 | Yes | | v7.11 | Mar 16, 2021 |Mar 16, 2022 | Yes |
| v8.0 | 1 Jun, 2021 |1 Jun, 2022 | Yes | | v8.0 | 1 Jun, 2021 |1 Jun, 2022 | Yes |
| v8.1 | In progress | | | | v8.1 | 10 Nov, 2021 |10 Nov, 2022 | Yes |
| v8.2 | In progress | | |
## FAQ ## FAQ
@@ -122,6 +123,8 @@ You can ask questions in the forum: [https://forum.lvgl.io/](https://forum.lvgl.
We use [GitHub issues](https://github.com/lvgl/lvgl/issues) for development related discussion. We use [GitHub issues](https://github.com/lvgl/lvgl/issues) for development related discussion.
You should use them only if your question or issue is tightly related to the development of the library. You should use them only if your question or issue is tightly related to the development of the library.
Before posting a question, please ready this FAQ section as you might find answer to your issue here too.
### Is my MCU/hardware supported? ### Is my MCU/hardware supported?
Every MCU which is capable of driving a display via parallel port, SPI, RGB interface or anything else and fulfills the [Requirements](#requirements) is supported by LVGL. Every MCU which is capable of driving a display via parallel port, SPI, RGB interface or anything else and fulfills the [Requirements](#requirements) is supported by LVGL.
@@ -145,7 +148,16 @@ Some examples of the supported display types:
See the [Porting](/porting/display) section to learn more. See the [Porting](/porting/display) section to learn more.
### Nothing happens, my display driver is not called. What have I missed? ### LVGL doesn't start, nothing is drawn on the display. What can be the problem?
- Try increasing `LV_MEM_SIZE`.
- Be sure `lv_disp_drv_t`, `lv_indev_drv_t` and `lv_fs_drv_t` are global or `static`.
- Be sure your display works without LVGL. E.g. paint it to red on start up.
- Enable [logging](porting/log)
- If you use an RTOS
- increase the stack size of the task which calls `lv_timer_handler()`
- Be sure you used a mutex as [described here](/porting/os)
### My display driver is not called. What have I missed?
Be sure you are calling `lv_tick_inc(x)` in an interrupt and `lv_timer_handler()` in your main `while(1)`. Be sure you are calling `lv_tick_inc(x)` in an interrupt and `lv_timer_handler()` in your main `while(1)`.
Learn more in the [Tick](/porting/tick) and [Task handler](/porting/task-handler) sections. Learn more in the [Tick](/porting/tick) and [Task handler](/porting/task-handler) sections.