mintu19
Posts: 4
Joined: Sat Jun 22, 2019 6:33 am

Compute module and LM832

Sat Nov 09, 2019 6:52 am

I am trying to attach Lm832 module to Raspberry Pi Compute module 3+.
This module have CYW43438 chip. I think Raspbian kernel have inbuilt drivers for them. And detected so.
However i am not able to get it to work with my compute.
Here is the error log on driver load.

Code: Select all

$ sudo modprobe brcmfmac

$ sudo dmesg -c
[ 381.903893] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 381.907147] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 381.939494] brcmfmac: F1 signature read @0x18000000=0x1541a9a6
[ 381.940215] brcmfmac: brcmf_chip_cores_check: CPU core not detected
[ 381.940229] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach failed!
[ 381.940249] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach failed
[ 381.940518] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed -19...
[ 381.940808] usbcore: registered new interface driver brcmfmac
Sch I am using is below
Attachments
main.jpg
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PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2439
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Compute module and LM832

Sat Nov 09, 2019 7:18 am

I see you've grounded the 32kHz clock input. Did the datasheet for the module say that was allowed? I know the 43455 can work without that clock, but it needs a change to the "nvram" text file to make it work.

mintu19
Posts: 4
Joined: Sat Jun 22, 2019 6:33 am

Re: Compute module and LM832

Sat Nov 09, 2019 8:18 am

From the datashhet
External sleep clock input (32.768 kHz). If an external 32.768 kHz clock cannot be
provided, pull this pin low. However, BLE will be always on and cannot enter deep sleep.

mintu19
Posts: 4
Joined: Sat Jun 22, 2019 6:33 am

Re: Compute module and LM832

Mon Nov 11, 2019 5:35 am

is clock necessary?

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2439
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: Compute module and LM832

Mon Nov 11, 2019 8:16 am

I feel you should be asking the provider of the module - we use the device with the clock.

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