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Flashing Issues with LSC Light Bulbs Model 2578539.2 Using BK7231 UART Flasher

mattistiret1 1749 35
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  • #31 21431975
    p.kaczmarek2
    Moderator Smart Home  
    So your Tuya config contains:
    Code: JSON
    Log in, to see the code

    but your device is using pins 7 and 8 in reality?
    Helpful post? Buy me a coffee.
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  • #32 21432264
    gehaxelt
    Level 6  
    Yes, exactly! Bktool's dissect_dumps outputs pins 9/24 with the SM2235 driver, but in reality I got the bulb to work pin 7/8 with the BP5758D driver.
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  • #33 21432275
    divadiow
    Level 34  
    glad you found the right pins. There are currently 8 other devices in the devicelist with the same
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  • #34 21432855
    p.kaczmarek2
    Moderator Smart Home  
    This is very strange. Can you do pin extraction on your device again and share created file, so we can just double-check that it has incorrect pins?
    https://www.youtube.com/watch?v=VDbaLR_0YWs
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  • #35 21434152
    gehaxelt
    Level 6  
    Hi again,

    sure, let's debug this! The original dump can be found in >>21425425. Here are the commands I used for extraction of the config/template:

    Code: text Expand Select all Copy to clipboard
    
$> pacman -Qi bk7231tools 
Name            : bk7231tools
Version         : 2.0.2-1

$> bktools dissect_dump -O output -e --rbl --storage lcs-led-rgbw-lb2.img 
RBL containers:
	0x10f9a: bootloader - [encoding_algorithm=NONE, size=0xea20]
		extracted to output
	0x129f0a: app - [encoding_algorithm=NONE, size=0xec1a0]
		extracted to output
Storage partition:
	0x1ee000: 28 KiB - 3 keys
	- 'gw_bi'
	- 'tuya_seed'
	- 'gw_di'
WARNING:root:Block by ID 2 does not exist, returning empty
		extracted all keys to output/lcs-led-rgbw-lb2_storage.json
WARNING:root:Block by ID 2 does not exist, returning empty
		extracted 'gw_bi' to output/lcs-led-rgbw-lb2_storage_gw_bi.bin
		extracted 'tuya_seed' to output/lcs-led-rgbw-lb2_storage_tuya_seed.bin
		extracted 'gw_di' to output/lcs-led-rgbw-lb2_storage_gw_di.bin
App code `user_param_key`:
	- found! Extracted to output/lcs-led-rgbw-lb2_user_param_key.json
	
$> cat output/lcs-led-rgbw-lb2_user_param_key.json
{
	"2235ccur": 14,
	"2235wcur": 6,
	"Jsonver": "1.1.9",
	"brightmax": 100,
	"brightmin": 5,
	"cagt": 20,
	"category": "0505",
	"cmod": "rgbcw",
	"colormax": 100,
	"colormin": 10,
	"colorpfun": 1,
	"crc": 72,
	"cwmaxp": 100,
	"cwtype": 0,
	"defbright": 100,
	"defcolor": "c",
	"deftemp": 100,
	"dmod": 8,
	"gmkb": 60,
	"gmkg": 60,
	"gmkr": 80,
	"gmwb": 75,
	"gmwg": 70,
	"gmwr": 100,
	"iicb": 0,
	"iicc": 4,
	"iicg": 1,
	"iicr": 2,
	"iicscl": 24,
	"iicsda": 9,
	"iicw": 3,
	"module": "CBU",
	"notdisturb": 0,
	"onoffmode": 1,
	"pairt": 600,
	"pmemory": 1,
	"prodagain": 0,
	"remdmode": 1,
	"rgbt": 15,
	"rstbr": 50,
	"rstcor": "c",
	"rstnum": 5,
	"rsttemp": 100,
	"title20": 1,
	"wfcfg": "spcl",
	"wfct": 10,
	"wt": 20
}
	
=> Pin 24 (scl) and 9 (sda) was extracted in combination with the SM2235 driver.


    I've attached the "Tuya GPIO Config" obtained from the flashed OBK bulb. Trying to import that file in BK7231Flasher.exe (run with mono on Linux) throws an exception:

    Code: text Expand Select all Copy to clipboard
    
Sorry, exception occured: System.ArgumentNullException: Buffer cannot be null.
Parameter name: buffer
  at System.IO.MemoryStream..ctor (System.Byte[] buffer, System.Boolean writable) [0x00009] in <296872a6734f443990477e3abd954b57>:0 
  at System.IO.MemoryStream..ctor (System.Byte[] buffer) [0x00000] in <296872a6734f443990477e3abd954b57>:0 
  at (wrapper remoting-invoke-with-check) System.IO.MemoryStream..ctor(byte[])
  at BK7231Flasher.TuyaConfig.fromBytes (System.Byte[] data) [0x0013f] in <0c14a74d79404cf69fc2e40bca5b14d7>:0 
  at BK7231Flasher.TuyaConfig.fromFile (System.String fname) [0x00024] in <0c14a74d79404cf69fc2e40bca5b14d7>:0 
  at BK7231Flasher.FormMain.importTuyaConfig (System.String file) [0x00008] in <0c14a74d79404cf69fc2e40bca5b14d7>:0 


    But then again, the lamp works with the following configuration:

    Code: text Expand Select all Copy to clipboard
    
  "pins": {
    "7": "BP5758D_DAT;0",
    "8": "BP5758D_CLK;0"
  },


    Does that help?
    Attachments:
  • #36 21434397
    p.kaczmarek2
    Moderator Smart Home  
    That's interesting, it really looks like a previous version left over in the Tuya keys partition. There are no mentions of pin "8" at all. Maybe they had to change their batch at factory internally and used hardcoded pins for BP5758D while not removing old config?

    Unless we have some kind of JSON extraction bug, I don't know, maybe config partition can have it's own previous version stored as well as in the fragments...
    Helpful post? Buy me a coffee.
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Topic summary

The discussion revolves around flashing issues with LSC light bulbs, specifically model 2578539.2 with firmware version 1.5.32, using the BK7231 UART flasher. The user reports encountering a "bus failed" error during the flashing process, suspecting a lack of power to the chip. Responses suggest checking the pin connections, particularly U1_TX, and examining the circuit traces for proper UART connections. A schematic is shared that successfully worked for similar devices, along with code snippets for ESPHome configuration, indicating the presence of a BP5758D LED driver inside the bulb.
Summary generated by the language model.
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