Cozylife DS-1211AN 3Gang Touch Switch: 1MB BL602L10 [XT-BL12][DT-BL12] - Images, Firmware & Boot

divadiow 3876 124

#121 21642397 23 Aug 2025 17:11

divadiow divadiow

Level 35

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Post #121
21642397 23 Aug 2025 17:11

thoughts?

https://github.com/divadiow/OpenBK7231T_App/actions/runs/17176758039
https://github.com/divadiow/OpenBK7231T_App/tree/refs/heads/bl6021mb

and to check: 1mb variant boots on 1mb DT-BL12. 2mb build still does not. 1mb build does not contain berry
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#122 21642558 23 Aug 2025 20:47

insmod insmod

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Post #122
21642558 23 Aug 2025 20:47

>>21642397
If 1mb build works on 2mb, then just add CONFIG_BL602_USE_1M_FLASH define directly in sdk. One less job for workflow that way.
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#123 21642574 23 Aug 2025 21:00

divadiow divadiow

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Post #123
21642574 23 Aug 2025 21:00

Hmm yeh I guess. Will check when home. I think it works fine on 2mb from memory. I wonder what the ACTUAL difference is with CONFIG_BL602_USE_1M_FLASH and if it's use on 2mb+ has any downsides
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#124 21642580 23 Aug 2025 21:05

insmod insmod

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Post #124
21642580 23 Aug 2025 21:05

>>21642574
It compiles and uses some specific read/write/erase functions, instead of using ROM ones.
Actually, there is no need to open a pull in SDK. Just add -DCONF_BL602_USE_1M_FLASH=1 define to CFLAGS in bouffalo.mk in app.
#125 21642622 23 Aug 2025 21:48

divadiow divadiow

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Post #125
21642622 23 Aug 2025 21:48

Oh very good. OK. Good
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Topic summary

The discussion focuses on the Cozylife DS-1211AN 3-gang touch wall switch featuring a 1MB BL602L10 Wi-Fi and BLE module, manufactured by Shenzhen Dianling Intelligent Technology Co Ltd. The main challenge is adapting OpenBeken/OpenBL602 firmware, which typically targets 2MB flash BL602 chips, to the 1MB flash variant, as standard builds and tools like OpenBeken do not natively support 1MB BL602L10 devices. Key technical issues include flash memory partitioning, bootloader compatibility, EasyFlash storage initialization, and power supply stability affecting boot loops and Wi-Fi connectivity.

Significant progress was made by creating and testing custom partition table (TOML) files tailored for 1MB flash layouts, notably the partition_cfg_1M_miegapele.toml, which allocates appropriate sizes for firmware, media, PSM, and factory partitions. Firmware builds with specific SDK configurations (e.g., CONFIG_BL602_USE_1M_FLASH and CONFIG_BL602_USE_ROM_DRIVER enabled) successfully boot and run on the 1MB BL602L10, including OpenBK7231T_App builds from GitHub pull requests #1532 and #1534.

Power supply quality and wiring (shorter VCC and ground cables, decoupling capacitors) were critical for stable operation, as the module exhibited boot looping and Wi-Fi instability when powered inadequately or with noisy sources. The GPIO17 pin usage and UART download mode resistor requirements were also discussed for module replacement or debugging.

Wi-Fi connection issues were partially resolved by adjusting router PMF (Protected Management Frames) settings and using simpler passwords. The firmware supports AP mode and basic Wi-Fi functions, though some web API endpoints (e.g., /api/lfs) may be incomplete. The community shared detailed boot logs, flash memory dumps, and PCB images to aid development and testing.

Overall, the topic demonstrates successful adaptation of OpenBL602 firmware to the 1MB BL602L10 module in the Cozylife DS-1211AN switch, with custom partitioning, SDK flags, and power considerations enabling stable boot and Wi-Fi operation, while highlighting ongoing challenges in full feature support and stability.
Summary generated by the language model.

FAQ

TL;DR: 1 MB BL602L10 modules run OpenBeken after setting CONFIG_BL602_USE_1M_FLASH=1, growing PSM to 32 KB and flashing a 793 kB image—"works on every sample we had" [Elektroda, miegapele, post #21438533] Why it matters: you can free cheap touch-switches and sensors from cloud lock-in with one flash.

Quick Facts

• Flash size: 1 MB (0x100000) [Elektroda, divadiow, post #21301826]
• Working firmware: OpenBL602_1M build 793 kB [Elektroda, maxim2002, post #21438474]
• Required PSM partition: 32 KB @ 0x0F4000 [Elektroda, miegapele, post #21442160]
• Supply voltage: 3.3 – 3.6 V; keep GND & VCC leads < 5 cm [Elektroda, divadiow, post #21434069]
• Typical flash time via DevCube 2 Mbaud: 16–18 s [Elektroda, niterian, post #21456497]

What change finally made 1 MB BL602L10 boot OpenBeken?

Defining CONFIG_BL602_USE_1M_FLASH := 1 switches the SDK to the alternate XIP flash routine (XIP_SFlash_Read_Need_Lock_Ext). This prevents EasyFlash from hanging at 0xE9000 and lets the board reach Wi-Fi initialisation [Elektroda, maxim2002, post #21438533]

Which partition table should I flash?

Use the 1 MB TOML posted by @miegapele: 64 KB boot+PT, 912 KB FW (0x010000-0x0F3FFF), 32 KB PSM (0x0F4000-0x0F7FFF), 16 KB factory DTB (0x0FC000). 8 KB PSM from the stock 1 MB table is too small and corrupts config saves [Elektroda, miegapele, post #21440834]

Why does the board reboot when I save Wi-Fi?

If PSM is only 8 KB the 3.6 KB config plus garbage–collection fills the sector, EasyFlash triggers GC every save and the watchdog resets. Expanding PSM to 32 KB fixes the loop [Elektroda, maxim2002, post #21438474]

How do I enter UART-download mode safely?

Hold IO8 high through a 10 kΩ pull-up to 3.3 V. 2. Reset or power-cycle. 3. Release after handshake. Direct 3.3 V without resistor may destroy the internal pull-up; one user measured 133 Ω to GND after such short [Elektroda, chemik_16, post #21440354]

What’s the preferred flashing procedure?

Pick DevCube 1.9.0, 2 Mbaud, 40 MHz clock. 2. Select the 1 MB TOML and the 1 MB OpenBL602 build (whole_img.bin & ro_params.dtb). 3. Erase, program, verify (≈17 s total). Verified SHA equals host value means success [Elektroda, niterian, post #21456497]

My module boots but loops every 3 s—why?

Long, thin supply leads add >100 mV drop during Wi-Fi TX. Shorten VCC/GND to <5 cm or power the module in-circuit. After trimming leads one tester eliminated the loop at 3.55 V [Elektroda, divadiow, post #21434069]

Does deep-sleep work on BL602?

Normal DeepSleep works; PinDeepSleep is not yet ported (available only for BK and XR chips) [Elektroda, insmod, post #21598541] Battery sensors such as TH01 will therefore drain faster than with XR modules.

Open Wi-Fi network won’t connect—edge case?

Yes. Current SDK refuses open (unencrypted) APs; WPA2-PSK connects reliably when 802.11w PMF is “Optional” [Elektroda, maxim2002, post #21441931]

Can I flash 1 MB firmware to a 2 MB module?

Yes. The 1 MB image boots fine on 2 MB BL602; the unused upper flash stays blank. OTA partition is omitted, so remote upgrade is disabled [Elektroda, miegapele, post #21440834]

How much free RAM remains after boot?

With full 1 MB build and Wi-Fi connected the board reports ~113 kB free; worst-case after WebApp stress it dipped to 18 kB before recovery [Elektroda, maxim2002, post #21441931]

Which devices are confirmed to work?

• Cozylife DS-1211AN 3-gang touch switch (replaced DT-BL12) [Elektroda, divadiow, post #21301826] • RGBCWW 18 W E27 bulb with BL602L10 (product p93sfg) [Elektroda, niterian, post #21456497]

‘No enough DESC 2(7)’ appears in log—danger?

It indicates the Wi-Fi driver ran out of TX descriptors during heavy HTTP polling; the stack recovers automatically but may drop the TCP connection [Elektroda, maxim2002, post #21441931] Keep polling intervals >100 ms.

How can I cut heat in the 18 W bulb?

Limit PWM brightness to 90 %. “Even at 90 % the RGBCWW bulb is visually identical but 8 °C cooler” [Elektroda, p.kaczmarek2, post #21599155] Add LED_Map 0 90 in autoexec.

Steps to build your own 1 MB image?

Checkout OpenBeken dev branch and Bouffalo SDK 1.6.39. 2. In proj_config.mk set CONFIG_BL602_USE_1M_FLASH=1. 3. Place the 1 MB TOML in partition. Compile with make BL602L10_1M. Output should be ~793 kB [Elektroda, miegapele, post #21438328]