RDA 5981AM/Broadlink BL3335-P - Generic/nobrand 15W RGBW B22 Bulb - basic teardown

Question 1

A teardown shows the RF can covers an RDA5981AM Wi‑Fi SoC. The carrier PCB is marked BR3335, and the assembled module is sold as BL3335‑P. Photos in the thread reveal the die marking after peeling the shield. This identification aligns the bulb with the RDA5981 software ecosystem rather than ESP‑class parts. [Elektroda, Altirix, post #21434019]

Answer

A teardown shows the RF can covers an RDA5981AM Wi‑Fi SoC. The carrier PCB is marked BR3335, and the assembled module is sold as BL3335‑P. Photos in the thread reveal the die marking after peeling the shield. This identification aligns the bulb with the RDA5981 software ecosystem rather than ESP‑class parts. [Elektroda, Altirix, post #21434019]

Question 2

Start with the FCC user manual for Broadlink BL3335‑P and the RDA5981AM datasheet. Both links are collected in the thread for quick access. The docs help with pinout, regulatory details, and SoC capabilities, which are essential for logging and firmware work. [Elektroda, Altirix, post #21434407]

Answer

Start with the FCC user manual for Broadlink BL3335‑P and the RDA5981AM datasheet. Both links are collected in the thread for quick access. The docs help with pinout, regulatory details, and SoC capabilities, which are essential for logging and firmware work. [Elektroda, Altirix, post #21434407]

Question 3

Active, mainstream support is not available. Builders have replaced the module with an ESP‑based board in similar bulbs due to the lack of open stacks targeting RDA5981. The thread opener invites contributors to attempt a port if interested. [Elektroda, Altirix, post #21434019]

Answer

Active, mainstream support is not available. Builders have replaced the module with an ESP‑based board in similar bulbs due to the lack of open stacks targeting RDA5981. The thread opener invites contributors to attempt a port if interested. [Elektroda, Altirix, post #21434019]

Question 4

Use a 3.3 V USB‑to‑serial (an Arduino in pass‑through mode works) and connect to RX/TX. Power the board at 3.3 V from a stable source. Open a terminal and reset the device to catch the early boot prints. [Elektroda, Altirix, post #21434407]

Answer

Use a 3.3 V USB‑to‑serial (an Arduino in pass‑through mode works) and connect to RX/TX. Power the board at 3.3 V from a stable source. Open a terminal and reset the device to catch the early boot prints. [Elektroda, Altirix, post #21434407]

Question 5

Tuya’s datasheet specifies GPIO2 as the log UART transmitter. Route your USB‑to‑serial RX to GPIO2 and common ground, then try standard baud rates. If silent, logs may be disabled in that build. [Tuya WRD3L Datasheet]

Answer

Tuya’s datasheet specifies GPIO2 as the log UART transmitter. Route your USB‑to‑serial RX to GPIO2 and common ground, then try standard baud rates. If silent, logs may be disabled in that build. [Tuya WRD3L Datasheet]

Question 6

Public SDKs are dated Mbed OS 5.1.5 branches, and FreeRTOS isn’t provided. As one contributor puts it, “the sdks i’ve seen are very old.” Expect missing modern tooling and limited RTOS choices without vendor updates. [Elektroda, insmod, post #21434414]

Answer

Public SDKs are dated Mbed OS 5.1.5 branches, and FreeRTOS isn’t provided. As one contributor puts it, “the sdks i’ve seen are very old.” Expect missing modern tooling and limited RTOS choices without vendor updates. [Elektroda, insmod, post #21434414]

Question 7

Use correct start address and 1 MB length to include the bootloader. The RDA Dump tool’s default vendor settings produce a 2044 KB file with repeated content on HLK‑M50. Adjust offsets to avoid mirrored dumps. [Elektroda, divadiow, post #21479530]

Answer

Use correct start address and 1 MB length to include the bootloader. The RDA Dump tool’s default vendor settings produce a 2044 KB file with repeated content on HLK‑M50. Adjust offsets to avoid mirrored dumps. [Elektroda, divadiow, post #21479530]

Question 8

One tester observed no UART output at any baud and no AP, only a brief power spike. That behavior suggests the image disables logs and soft‑AP or the device waits for external triggers. Verify power integrity and logging pins. [Elektroda, divadiow, post #21479538]

Answer

One tester observed no UART output at any baud and no AP, only a brief power spike. That behavior suggests the image disables logs and soft‑AP or the device waits for external triggers. Verify power integrity and logging pins. [Elektroda, divadiow, post #21479538]

Question 9

Yes, but they’re rare and expensive. Identified 2 MB variants include WRD2L, TYWRD2S, and TYWRD3S. The same source also lists other interesting Wi‑Fi/BLE modules stocked by the seller, but not RDA5981 alternatives at similar cost. [Elektroda, insmod, post #21634746]

Answer

Yes, but they’re rare and expensive. Identified 2 MB variants include WRD2L, TYWRD2S, and TYWRD3S. The same source also lists other interesting Wi‑Fi/BLE modules stocked by the seller, but not RDA5981 alternatives at similar cost. [Elektroda, insmod, post #21634746]

Question 10

Check hfeasy for utilities and the RDA Dump tool used with Hi‑Flying modules. The thread includes sample dumps, boot strings, and notes on correcting dump bases to avoid duplicated images. [Elektroda, divadiow, post #21479530]

Answer

Check hfeasy for utilities and the RDA Dump tool used with Hi‑Flying modules. The thread includes sample dumps, boot strings, and notes on correcting dump bases to avoid duplicated images. [Elektroda, divadiow, post #21479530]

Question 11

Yes. If documentation is thin, remove the can or the module and inspect the underside for silkscreened GPIO labels. This is a practical way to map UART and control lines before wiring. [Elektroda, p.kaczmarek2, post #21434400]

Answer

Yes. If documentation is thin, remove the can or the module and inspect the underside for silkscreened GPIO labels. This is a practical way to map UART and control lines before wiring. [Elektroda, p.kaczmarek2, post #21434400]

Question 12

A maintainer expressed interest but is prioritizing XR806 porting first. That places any RDA5981 work in a queue without a public timeline. Community test hardware and logs would help when development starts. [Elektroda, p.kaczmarek2, post #21434400]

Answer

A maintainer expressed interest but is prioritizing XR806 porting first. That places any RDA5981 work in a queue without a public timeline. Community test hardware and logs would help when development starts. [Elektroda, p.kaczmarek2, post #21434400]

Question 13

It’s an unbranded bulb, likely from AliExpress, carrying a Broadlink BL3335‑P module with an RDA5981AM under the RF can. Prior art shows people replacing the control board with ESP boards due to software support gaps. [Elektroda, Altirix, post #21434019]

Answer

It’s an unbranded bulb, likely from AliExpress, carrying a Broadlink BL3335‑P module with an RDA5981AM under the RF can. Prior art shows people replacing the control board with ESP boards due to software support gaps. [Elektroda, Altirix, post #21434019]

Question 14

Captured strings include “airkiss‑2.0.0‑25360 (Dec 17 2015) ... ARM Cortex‑M3” and a build timestamp from December 2017. Those indicate legacy Broadlink stacks and toolchains, aligning with the older SDK landscape. [Elektroda, divadiow, post #21479530]

Answer

Captured strings include “airkiss‑2.0.0‑25360 (Dec 17 2015) ... ARM Cortex‑M3” and a build timestamp from December 2017. Those indicate legacy Broadlink stacks and toolchains, aligning with the older SDK landscape. [Elektroda, divadiow, post #21479530]

Question 15

A GitHub mirror collects RDA5981 SDK material, including Mbed OS 5.1.5 based trees. It’s a starting point for analysis, though not a modern upstream. [Elektroda, divadiow, post #21434436]

Answer

A GitHub mirror collects RDA5981 SDK material, including Mbed OS 5.1.5 based trees. It’s a starting point for analysis, though not a modern upstream. [Elektroda, divadiow, post #21434436]

RDA 5981AM/Broadlink BL3335-P - Generic/nobrand 15W RGBW B22 Bulb - basic teardown

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