SF32LB52 development board connected to Huangshanpai screen does not light up

Troubleshooting
1

Using the SF32LB32 development board connected to the Huangshanpai display, I ran the LVGL v8 benchmark. The serial port successfully printed the results, but the screen remains unlit. The log output is as follows:

[14:40:44.789]Recv←◆Serial:c2,Chip:4,Package:3,Rev:2 Reason:00000000

\ | /

  • SiFli Corporation
    / | \ build on Oct 11 2025, 2.4.0 build 00000000
    2020 - 2022 Copyright by SiFli team
    mount /dev success
    [2411] I/drv.rtc main: PSCLR=0x80000100 DivAI=128 DivAF=0 B=256
    [2439] I/drv.rtc main: RTC use LXT RTC_CR=00000001

[2460] I/drv.rtc main: Init RTC, wake = 0

[2623] I/drv.audprc main: init 00 ADC_PATH_CFG0 0x606

[2644] I/drv.audprc main: HAL_AUDPRC_Init res 0

[2666] I/drv.audcodec main: HAL_AUDCODEC_Init res 0

[2687] I/TOUCH main: Regist touch screen driver, probe=0x12026149
call par CFG1(3313)
fc 9, xtal 2000, pll 2047
call par CFG1(3313)
fc 9, xtal 2000, pll 2048
LV_COLOR_DEPTH = 16
LV_COLOR_16_SWAP = 0
[2883] I/drv.lcd main: [NONE] → [OPENING]
[2901] I/drv.lcd lcd_task: open
[2914] I/drv.epic lcd_task: drv_gpu opened.
[2931] I/drv.lcd lcd_task: HW open
[2961] I/drv.lcd lcd_task: Try registered LCD driver…
msh /→
[14:40:44.868]Recv←◆
CO5300_ReadID 0x331100
[5270] I/co5300 lcd_task: LCD module use CO5300 IC

[14:40:45.059]Recv←◆
CO5300_ReadID 0x331100
[11512] I/co5300 lcd_task: LCD module use CO5300 IC

[11533] I/drv.lcd lcd_task: Found lcd co5300 id:331100h
[11554] I/drv.lcd lcd_task: HW open done.
[11571] I/drv.lcd lcd_task: [OPENING] → [INITIALIZED]
[11591] I/drv.lcd lcd_task: open done.
[11610] I/drv.lcd_fb main: drv_lcd_fb_init
[11628] I/drv.lcd_fb main: drv_lcd_fb_init done.
[11737] I/TOUCH main: Open
[11752] I/TOUCH tp_init: Find touch screen driver…
[11773] I/TOUCH tp_init: Probe 12026149
[11791] I/TOUCH tp_init: touch screen found driver 0x20043fe8, ft6146
[11818] I/TOUCH main: Opened.
[11833] I/LVGL main: [littlevgl2rtt] Welcome to the littlevgl2rtt lib.

[14:40:45.106]Recv←◆[13035] I/drv.lcd lcd_task: Auto turn on display.
[13057] I/drv.lcd lcd_task: set brightness 50
[13078] I/drv.lcd lcd_task: display on
[13093] I/drv.lcd lcd_task: [INITIALIZED] → [ON]

[14:40:45.154]Recv←◆[14582] E/drv.ft6146 tp_init: ft6146 id_H=64
[14607] E/drv.ft6146 tp_init: ft6146 id_L=56

[14:42:22.752]Recv←◆
LVGL v8.3.1 Benchmark (in csv format)
Weighted FPS: 59
Opa. speed: 98%
Rectangle,75
Rectangle + opa,75
Rectangle rounded,72
Rectangle rounded + opa,59
Circle,68
Circle + opa,44
Border,81
Border + opa,79
Border rounded,71
Border rounded + opa,70
Circle border,65
Circle border + opa,58
Border top,76
Border top + opa,72
Border left,72
Border left + opa,72
Border top + left,71
Border top + left + opa,71
Border left + right,70
Border left + right + opa,69
Border top + bottom,68

[14:42:22.805]Recv←◆Border top + bottom + opa,70
Shadow small,21
Shadow small + opa,21
Shadow small offset,19
Shadow small offset + opa,17
Shadow large,8
Shadow large + opa,8
Shadow large offset,8
Shadow large offset + opa,8
Image RGB,76
Image RGB + opa,79
Image ARGB,71
Image ARGB + opa,70
Image chorma keyed,72
Image chorma keyed + opa,72
Image indexed,66
Image indexed + opa,59
Image alpha only,73
Image alpha only + opa,72
Image RGB recolor,70
Image RGB recolor + opa,72
Image ARGB recolor,69
Image ARGB recolor + opa,72
Image chorma keyed recolor,72
Image chorma keyed recolor + opa,86
Image indexed recolor,54
Image indexed recolor + opa,50
Image RGB rotate,20
Image RGB rotate + opa,20
Image RGB rotate anti aliased,20
Image RGB rotate anti aliased + opa,20
Image ARGB rotate,19
Image ARGB rotate + opa,19
Image ARGB rotate anti aliased,19
Image ARGB rotate anti aliased + opa,18
Image RGB zoom,67
Image RGB zoom + opa,68
Image RGB zoom anti aliased,67
Image RGB zoom anti aliased + opa,68
Image ARGB zoom,67
Image ARGB zoom + opa,68
Image ARGB zoom anti aliased,68
Image ARGB zoom anti aliased + opa,67
Text small,25
Text small + opa,26
Text medium,25
Text medium + opa,26
Text large,26
Text large + opa,26
Text small compressed,43
Text small compressed + opa,41
Text medium compressed,41
Text medium compressed + opa,41

[14:42:23.049]Recv←◆Text large compressed,40
Text large compressed + opa,41
Line,64
Line + opa,65
Arc think,68
Arc think + opa,67
Arc thick,68
Arc thick + opa,59
Substr. rectangle,100
Substr. rectangle + opa,91
Substr. border,75
Substr. border + opa,76
Substr. shadow,74
Substr. shadow + opa,74
Substr. image,72
Substr. image + opa,72
Substr. line,89
Substr. line + opa,82
Substr. arc,66
Substr. arc + opa,66
Substr. text,74
Substr. text + opa,77

Hardware connection as shown below:

bf6340d89c1e54e19bf42f58d19d1c23

image

2

It seems the touch chip is not being recognized, possibly due to a poor FPC connection; you can check the connection.
To test the screen, run the example/rt_driver example.

3

Thank you. I ran the example/rt_driver example and was able to read the touch coordinates, and the logs did not print any error messages. However, the screen still remains blank. Can I now confirm that this is a hardware connection issue?

image

4

If the screen still doesn’t respond under this example, it’s most likely a hardware connection issue.
Did you purchase both your development board and screen from the official Taobao store?

5

The screen was purchased together with the Huangshanpai development board from the Taobao Zhenxi Flagship Store, and the development board was bought from the official Taobao store. The screen works normally when connected to the Huangshanpai development board, but it doesn’t display anything when connected to the LB52 development board.

6

This issue should be caused by the inconsistency of VBAT between HuangshanPi and the LCD development board. Referring to the schematic diagram of the HuangshanPi screen adapter board, you could try moving the 0R resistor from R4 to R5.
WeChat Work Screenshot_d2ee818e-08d0-47d4-bd56-efa0907193d3

7

Hello, has this issue been resolved? Was it a hardware connection problem?