SPI_HOST_MAX, LV_VER_RES_MAX and LV_HOR_RES_MAX not defined! about lvgl_esp32_drivers

[xbzxsh]

add these lines under the define comment in file "lvgl_helpers.h" should work.

# define LV_HOR_RES_MAX 320
# define LV_VER_RES_MAX 240
# define SPI_HOST_MAX 3

[mohammadjavadpirhadi]

add these lines under the define comment in file "lvgl_helpers.h" should work.

# define LV_HOR_RES_MAX 320
# define LV_VER_RES_MAX 240
# define SPI_HOST_MAX 3

@xbzxsh Yes, I know! But I expect that the library handle this automatically.

[albatros96]

I saw this issue isn't closed yet, so I'm goint to write what I tried.

I'm a newcomer in LVGL and I'd like to develop a little project with the ESP32. However I noticed from the docs that It's not clear for which version is made the lvgl_esp32_drivers.

I'm using the v4.4.1 version for ESP-IDF.

I created a very simple piece of code:

#include "lvgl.h"

int app_main(void)
{
    lv_init();

    return 0;
}

Directory for lvgl library under components/lvgl.
Directory for lvgl_esp32_drivers under components/lvgl_esp32_drivers at master branch.

I started with the master branch for lvgl and I found this error:

../components/lvgl/src/core/../libs/ffmpeg/../../../src/widgets/meter/lv_meter.h:22:2: error: #error "lv_meter: Complex drawing is required. Enable it in lv_conf.h (LV_USE_DRAW_MASKS 1)"
 #error "lv_meter: Complex drawing is required. Enable it in lv_conf.h (LV_USE_DRAW_MASKS 1)"
  ^~~~~
In file included from ../components/lvgl/src/core/../libs/ffmpeg/lv_ffmpeg.h:15,
                 from ../components/lvgl/src/core/lv_obj.c:28:
../components/lvgl/src/core/../libs/ffmpeg/../../../lvgl.h:120:2: warning: #warning "You are using the development version of LVGL which is not stable at this moment. For production use the release/v8.3 branch. To silence this warning add #define LV_USE_DEV_VERSION to lv_conf.h" [-Wcpp]
 #warning "You are using the development version of LVGL which is not stable at this moment. For production use the release/v8.3 branch. To silence this warning add #define LV_USE_DEV_VERSION to lv_conf.h"
  ^~~~~~~

I switched to release/v8.3, here the resulting error, as a lot of people said:

../components/lvgl_esp32_drivers/lvgl_helpers.c: In function 'lvgl_driver_init':
../components/lvgl_esp32_drivers/lvgl_helpers.h:57:25: error: 'LV_HOR_RES_MAX' undeclared (first use in this function); did you mean 'LV_HOR_RES'?
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
                         ^~~~~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:421:137: note: in expansion of macro 'DISP_BUF_SIZE'
         if (level==ESP_LOG_ERROR )          { esp_log_write(ESP_LOG_ERROR,      tag, LOG_FORMAT(E, format), esp_log_timestamp(), tag, ##__VA_ARGS__); } \
                                                                                                                                         ^~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:443:41: note: in expansion of macro 'ESP_LOG_LEVEL'
         if ( LOG_LOCAL_LEVEL >= level ) ESP_LOG_LEVEL(level, tag, format, ##__VA_ARGS__); \
                                         ^~~~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:353:38: note: in expansion of macro 'ESP_LOG_LEVEL_LOCAL'
 #define ESP_LOGI( tag, format, ... ) ESP_LOG_LEVEL_LOCAL(ESP_LOG_INFO,    tag, format, ##__VA_ARGS__)
                                      ^~~~~~~~~~~~~~~~~~~
../components/lvgl_esp32_drivers/lvgl_helpers.c:61:5: note: in expansion of macro 'ESP_LOGI'
     ESP_LOGI(TAG, "Display buffer size: %d", DISP_BUF_SIZE);
     ^~~~~~~~
../components/lvgl_esp32_drivers/lvgl_helpers.h:57:25: note: each undeclared identifier is reported only once for each function it appears in
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
                         ^~~~~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:421:137: note: in expansion of macro 'DISP_BUF_SIZE'
         if (level==ESP_LOG_ERROR )          { esp_log_write(ESP_LOG_ERROR,      tag, LOG_FORMAT(E, format), esp_log_timestamp(), tag, ##__VA_ARGS__); } \
                                                                                                                                         ^~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:443:41: note: in expansion of macro 'ESP_LOG_LEVEL'
         if ( LOG_LOCAL_LEVEL >= level ) ESP_LOG_LEVEL(level, tag, format, ##__VA_ARGS__); \
                                         ^~~~~~~~~~~~~
C:/Espressif/frameworks/esp-idf-v4.4.1/components/log/include/esp_log.h:353:38: note: in expansion of macro 'ESP_LOG_LEVEL_LOCAL'
 #define ESP_LOGI( tag, format, ... ) ESP_LOG_LEVEL_LOCAL(ESP_LOG_INFO,    tag, format, ##__VA_ARGS__)
                                      ^~~~~~~~~~~~~~~~~~~
../components/lvgl_esp32_drivers/lvgl_helpers.c:61:5: note: in expansion of macro 'ESP_LOGI'
     ESP_LOGI(TAG, "Display buffer size: %d", DISP_BUF_SIZE);
     ^~~~~~~~
In file included from c:\espressif\tools\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\xtensa-esp32-elf\sys-include\sys\reent.h:503,
                 from C:/Espressif/frameworks/esp-idf-v4.4.1/components/newlib/platform_include/sys/reent.h:17,
                 from c:\espressif\tools\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\xtensa-esp32-elf\sys-include\string.h:11,
                 from ../components/lvgl/src/misc/lv_mem.h:20,
                 from ../components/lvgl/lvgl.h:28,
                 from ../components/lvgl_esp32_drivers/lvgl_tft/disp_driver.h:16,
                 from ../components/lvgl_esp32_drivers/lvgl_helpers.h:18,
                 from ../components/lvgl_esp32_drivers/lvgl_helpers.c:10:
../components/lvgl_esp32_drivers/lvgl_helpers.c: In function 'lvgl_spi_driver_init':
../components/lvgl_esp32_drivers/lvgl_helpers.c:157:28: error: 'SPI_HOST_MAX' undeclared (first use in this function); did you mean 'GPIO_PORT_MAX'?
     assert((0 <= host) && (SPI_HOST_MAX > host));

So I switched to the last version for v7 instead of using the newer v8, named v7.11.0, but it showed this remaining error:

In file included from c:\espressif\tools\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\xtensa-esp32-elf\sys-include\sys\reent.h:503,
                 from C:/Espressif/frameworks/esp-idf-v4.4.1/components/newlib/platform_include/sys/reent.h:17,
                 from c:\espressif\tools\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\xtensa-esp32-elf\sys-include\string.h:11,
                 from ../components/lvgl/src/lv_hal/../lv_misc/lv_area.h:17,
                 from ../components/lvgl/src/lv_hal/lv_hal_disp.h:22,
                 from ../components/lvgl/src/lv_hal/lv_hal.h:16,
                 from ../components/lvgl/lvgl.h:30,
                 from ../components/lvgl_esp32_drivers/lvgl_tft/disp_driver.h:16,
                 from ../components/lvgl_esp32_drivers/lvgl_helpers.h:18,
                 from ../components/lvgl_esp32_drivers/lvgl_helpers.c:10:
../components/lvgl_esp32_drivers/lvgl_helpers.c: In function 'lvgl_spi_driver_init':
../components/lvgl_esp32_drivers/lvgl_helpers.c:157:28: error: 'SPI_HOST_MAX' undeclared (first use in this function); did you mean 'GPIO_PORT_MAX'?
     assert((0 <= host) && (SPI_HOST_MAX > host));

It disappears if I write #define SPI_HOST_MAX 3 at the top of lvgl_helpers.h, the code then completes the build process correctly.

Some suggestions:

1. The documentation for lvgl_esp32_drivers in the README is not well written. I didn't find which version of LVGL I should use.
2. The definition of SPI_HOST_MAX in the master branch of lvgl_esp32_drivers is missing.
3. For lvgl_esp32_drivers there aren't branches with names related to the versions of LVGL, apart of develop/lvgl_7.11.0_idf_5.0 which I didn't try.
4. The given ready-to-use example lv_port_esp32 at this link referres to this repo which is archived. Now we should use this instead. It doesn't return any compilation error because SPI_HOST_MAX is not used in the function lvgl_spi_driver_init() inside lvgl_helpers.c. Infact it doesn't use the last master for lvgl_esp32_drivers, but the commit 9fed1cc47b5a45fec6bae08b55d2147d3b50260c instead.

Did anyone find the magic combination to make LVGL work with ESP32?

Related to this question: I didn't find a clear way to compile, as you can see.

---

I hope I shared useful elements to improve this library. Only a question remains: using the missing definitions, can I use the LVGL library without bad surprises?

[nicklasb]

add these lines under the define comment in file "lvgl_helpers.h" should work.

# define LV_HOR_RES_MAX 320
# define LV_VER_RES_MAX 240
# define SPI_HOST_MAX 3

@xbzxsh Yes, I know! But I expect that the library handle this automatically.

@xbzxsh, I agree with @mohammadjavadpirhadi, isn't this odd?
There used to be an #ifdef before, but now it isn't.

Wouldn't a KConfig setting be better there?

[MrSurly]

Was there any resolution to this? In the other issue related to this, @kisvegabor said:

It's because the ESP related repos are still not updated to LVGL v8.

So I reverted components/lvgl in my project to v7.9.1.

Also, I'm using IDF v4.4.3 since the LVGL ESP32 docs say

ESP-IDF v4 framework is the suggested version to use.

Did anyone find the magic combination to make LVGL work with ESP32?

[albatros96]

I have an update.
@MrSurly I found that if I compile under the branch develop/lvgl_7.11.0_idf_5.0 of lvgl_esp32_drivers it compiles without needing any type of variation inside the library. I'm still using ESP-IDF v4.4.1.

I hope to be helpful.

EDIT: I've just seen that there is a merge request to solve the problem of missing defines. They updated the develop branch.
This enforce the fact that we should not use the master branch for lvgl_esp32_drivers.