#Custom bluepill stm32 RFM95W rebooting issues

10 messages · Page 1 of 1 (latest)

viscid haven
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Hi, I've created a custom build with a RFM95 and a stm32f103 blue pill and I have it somewhat working with my betafpv 900MHz micro TX, however I keep getting dropouts, and the receiver keeps rebooting ever few seconds and telemetry drops out on my radiomaster. For now I'm just logging to the debug uart and I've attached 2 logs below, one has DDEBUG_LOG_VERBOSE enabled and the other with DDEBUG_RCVR_LINKSTATS enabled. I also attached a picture of my setup. I have a 3 inch wire https://learn.adafruit.com/adafruit-rfm69hcw-and-rfm96-rfm95-rfm98-lora-packet-padio-breakouts/assembly#wire-antenna-2433240for an antenna for reference. Any clue why this may be happening?

📎 LOG_VERBOSE.txt 📎 RCVR_LINKSTATS.txt xMDaURlnrxfFSOPZGHb5h-9jTAHXkuO6Saoqrvgn8XPRQ6LVg_4Zqq8fNswf85TruFc8LS9NxRpDbiibXhvWJs_k96m2Xnx_z6SQEJ-loe7GToJT75RXecEszdMqg4Favcb0v50owrBIIY_tH-cJb6rJhX9eReTAhBje7CX2z9H8k2Xl2kHq67nvKz1Nyj9mUE-lTKnVSpwOe7ELWerpDASS6qZmxmeKA-dKxv_avga2HRyguH3rPy3qphvqZxMbDGDnVo36yTrRLg21VHAimILP2N6OySNSzgb5qumPFk_e6QyDDHXznhNSO4JAoFLYvkFioJhb1TuZ5x3RD9EOscJ_h30ljxZX7Tm4Mjw4byD9KSExgMhtp71xydLxLoRUzBDfRppcCbfpMP7hbj3pMp5avh98IBpzjUwWze98ZFiwd_-xyzyUEcR9paJO883dD5dhDE4trZcnRogoxYO9lJeKseorAdhFh4TtWX2aX8o0g1C3qsLehXXXmGj8..png
Adafruit Learning System
Adafruit RFM69HCW and RFM9X LoRa Packet Radio Breakouts

Radio transceiver modules for long distance data communication

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Custom bluepill stm32 RFM95W rebooting issues

ashen haven
viscid haven
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Should I post this somewhere else? I'm looking to build my own receiver based on the rfm95x and stm32f103 bluepill. I'm able to debug the code, but I haven't figured out why it keeps rebooting. Some theories I have:

  1. is it because I don't have a FC connected?
  2. simple wire antenna isn't working?
  3. clocks aren't synced? as mentioned here: https://www.expresslrs.org/3.0/hardware/crystal-frequency-error/
  4. The custom build I made has a bug? See modified-code.txt below
  5. The wires between the stm32 and rfm95x are too long?
📎 modified-code.txt
Crystal Oscillator (XO) Frequency Error - ExpressLRS

A short guide to control the Crystal Oscillator frequency error within the tolerable amount.

viscid haven
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Edit: It's starting to look like a power issue since the power led is fluctuating and I don't think my st-link can supply enough current. I had it working for a few min this morning

ashen haven
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sometimes that does wonders

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will probably not do it in this case, but worth a try

viscid haven
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Thanks. I switched to powering over usb and now it's working although it appears the power led is still fluctuating a little. I'll keep that in mind when designing a pcb

ashen haven