i don&039;t see wifi after flash bl602

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Direct answer to the question - Your BL602 likely isn’t broadcasting an AP or bringing up the Wi‑Fi stack because of one or more of: wrong boot mode GPIO8, incomplete imagepartition layout boot2 + partition table + app, missingcorrupted RF calibration data, unstable power during RF init, or firmwareAP security incompatibility. - Quick triage: ensure run mode GPIO8 not held high, power from a stable 3.3 V500 mA source, connect UART and read boot logs, then reflash a known‑good “combined” image that includes boot2, partition table and app. Test against a 2.4 GHz WPA2‑PSK AP on channels 1–11. Detailed problem analysis - Boot mode and strapping GPIO8 - BL602 samples GPIO8 on reset. Held high → downloadflash mode; lowfloating → run application. If you just flashed and left a “BOOT”IO8 jumper on VCC, the app never runs, so no Wi‑Fi appears. - Action: remove the BOOT jumper or ensure GPIO8 is lowfloating, then hard power‑cycle. - Firmware image composition - BL602 doesn’t boot a raw application at 0x0000. It expects: - boot2 secondary bootloader at flash base, - a valid partition table offset varies by SDK, - your application in the app partition, - optional RFNV partitions. - If you only wrote an app binary, or the partition table doesn’t match what boot2 expects, Wi‑Fi init never happens. - Action: use the vendorproject’s “combinedpack” image or configure your flasher to write boot2, PT, and app to their correct offsets. Prefer a full chip erase when migrating between SDKsfirmwares. - RF calibration “RF para”, “NV”, “PHY” - The Wi‑FiBT PHY needs calibration blobs stored in a reserved flash region. A chip‑erase without restoring or re‑generating these can leave the radio disabled or failing init. - Typical symptoms in logs: “RF init fail”, “cal data not found”, or silent bring‑up with no AP. - Action: reflash a firmware that knows how to generaterepair RF params on first boot, or restore the factory RF partition if you have a dump. Avoid erasing the RFNV partition unless you plan to re‑initialize it. - Power integrity - Wi‑Fi TXRX bursts cause fast transient current spikes 200–350 mA. Programming adapters’ 3.3 V pins often sag under these edges. - Action: power from a proper 3.3 V regulator ≥500 mA, keep leads short, and place local decoupling near VDD e.g., 100 nF + 10 µF ceramics and a 47–100 µF bulk. Verify with a scope at the BL602 VDD pin; droops below ~3.0 V during init can brownoutreset before the AP appears. - UART diagnostics most useful single step - Connect USB‑UART: BL602 TX=GPIO16 → adapter RX, BL602 RX=GPIO7 → adapter TX, GND↔GND. Don’t feed 3.3 V from the adapter if you have another supply. - Baud rates: boot ROMboot2 commonly at 2,000,000 or 921,600 baud; many apps switch to 115,200 after hand‑off. - Look for: “Boot2 start”, partition table parse, filesystemLittleFS messages, “WiFi initmgmr”, “RF init”, or explicit error codes. No output at all usually indicates wrong modeboot2 missing, or a dead supply. - AP vs. STA behavior - If your firmware defaults to STA client, it won’t broadcast an SSID. If it’s preconfigured with the wrong credentials, you’ll also “see no Wi‑Fi.” - Action: use the firmware’s CLIconsole to force AP mode enable AP, set SSIDpass, save, reboot or clear Wi‑Fi config to trigger first‑boot AP. - APsecurity compatibility - BL602 2.4 GHz only; many firmwares do not support WPA3‑SAE only. WPA2‑PSK AESCCMP is the safest baseline. Mixed WPA2WPA3 can work; WPA3‑only often fails. Hidden SSIDs and exotic characters can also trip parsers. - Action: for bring‑up, create a simple 2.4 GHz SSID ASCII, no spaces, WPA2‑PSK AES, channel 1611, 20 MHz bandwidth. - Clocking and board specifics - boot2 build must match your crystal commonly 40 MHz. A mismatch can cause timingradio issues. - Ensure the antenna feedmatching network is intact and not shorted by test fixtures; poor RF won’t stop the AP from appearing at 0–1 m, but severe detuning can. Current information and trends - Community firmware stacks for BL602 e.g., minimalist RTOS builds or lightweight IoT firmwares commonly expose serialWeb CLIs to force AP and repair Wi‑Fi config without reflash. - WPA3 adoption on consumer APs has exposed compatibility gaps in many low‑cost IoT radiosSDKs; best practice during bring‑up remains WPA2‑PSK on 2.4 GHz. - Tooling has converged around two flashers: the vendor GUI DevCube and CLI tools blflash. Combined images and “whole chip” packs reduce partitionlayout errors. Supporting explanations and details - Why boot2partitions matter: boot2 validates and locates the app via the partition table and may mount a filesystem that stores RFNV. If any of these steps fail, the app might not run or the radio stack won’t initialize. - Why RF cal matters: per‑device PALNADC offsetIQ imbalance values are used to meet spectral mask and sensitivity; without them, the driver may refuse to enable the RF. Ethical and legal aspects - Don’t transmit on prohibited channelsTx powers for your region. Use compliant antennas and observe local spectrum regulations e.g., FCCETSI. - If working on a consumer product, ensure you do not invalidate radio certifications by altering RF paths, antennas, or firmware beyond allowed configurations. Practical guidelines - Minimal, deterministic bring‑up recipe 1 Set run mode: remove BOOTIO8 jumper, power‑cycle. 2 Stable power: external 3.3 V supply ≥500 mA, add local decoupling. 3 Capture logs: try 2,000,000 baud first, then 115,200. Save full boot text. 4 Full reflash with known‑good combined image: include boot2 matching crystal, partition table, app. Prefer full erase when switching firmware families. 5 First boot: wait 20–40 s for filesystemRF init; watch for “RFWi‑Fi init done.” 6 Force AP via console if needed: enable AP, set SSIDpass, save, reboot. 7 Test with a clean 2.4 GHz WPA2‑PSK AP on channels 1611. 8 Only after AP appears, test STA connection to your target router. - Verification methods - Read back flash after programming and verify key ranges boot2, PT, app match the image. - If available, run a “wifiscan” or “wifiap” example from the vendor SDK to isolate hardware vs. app issues. Potential challenges and how to overcome them - Silent failures with mixedlegacy configs: temporarily reset Wi‑Fi credentials and use a known simple AP. - Unstable serial at 2 Mbps: drop to 921,600 or 115,200, but note you may miss early boot messages; try both. - Bricked feel after chip‑erase: re‑enter download mode by holding GPIO8 high, reset, then flash a full image including boot2. Possible disclaimers or additional notes - Exact flash offsets vary by SDKfirmware family; always use the partition table bundled with your chosen firmware. - Some modules ship without external RF shielding or with layout compromises; range will be limited even when functioning. Suggestions for further research - Obtain and study your firmware’s partition.json or equivalent to confirm offsets and sizes. - Review your board’s schematic for boot strapping, crystal value, and antenna network. - Explore automated RF‑cal regeneration procedure in your stack to avoid manual partition restores. - Keep a minimal test AP old router or smartphone hotspot configured to WPA2‑PSK for bring‑up regressions. Brief summary - “No Wi‑Fi after flash” on BL602 is most often a bootpartitionRF‑cal or power integrity problem—not a dead radio. Put the chip into run mode GPIO8, power it properly, read the UART logs, and reflash a combined image that includes boot2 + partition table + app. Then test against a simple 2.4 GHz WPA2 AP and, if needed, force AP mode from the console. - If you share your UART boot log, flasher settings tool, images, offsets, boardmodule type, and AP settings, I can pinpoint the exact failure stage and provide exact commands for your setup.

BL602 Wi-Fi Not Visible After Flashing Firmware – Boot Mode, Partition, RF Calibration Issues

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