Require Assistance and schematic review For Halow Startup using SPI

Software Embedded
1

Hi,

I have implemented a schematic for 4108E-S module from FnLink using the reference given in this document

Fn-Link_FG4108ESXX-01_datasheet_V1.0_20241101 (2).pdf (2.4 MB)

However, the schematic i made does not include pullups for MOSI MISO CS, IRQ (attached below), i even tried adding external 10k pullups to MISO MOSI and CS pins but still same error. I am also powering the halow module using ESP P4’s 3.3v line

SCH_Schematic1_2026-08-04.pdf (121.0 KB)
I am also using the BCF provided from FnLink as mentioned below, adding it in bcf folder and using full name “FIFNLINK-1.8.1.1_C20A7D71.bin” in the menuconfig.

FIFNLINK-1.8.1.1_C20A7D71.zip (654 Bytes)

but my porting_assistant tests fail with message : SDIO/SPI Startup [ FAIL ]“Possible causes may include: SDIO/SPI controller not configured correctly, Communication errors due to noise on SPI/SDIO lines.” [In esp idf].

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is there any way to resolve this issue?

I would like to request assistance in this regard and a review of my schematic, so that i could improve it and make this work.

2

I’ll give this a more thorough review shortly, but please make sure you have a pull-up on SDIO D2. It’s essential for MM6108. Please see the recommended schematic in section 3.4 of https://www.morsemicro.com/resources/datasheets/modules/MM6108-MF08651-US_Data_Sheet.pdf (and adjust for pinout, as this is a different module :slight_smile:

3

Thank you very much, looking forward for your thorough review.