uatechsys
Posts: 2
Joined: Mon May 22, 2017 8:15 pm

Re: SDIO for Wifi/Bluetooth module

Mon May 22, 2017 8:26 pm

I am not sure if it is just me but I don't get the logic of removing all the network peripherals in the name of industrial use which make this SBC standout among others. The cherry on top is that there is no documentation or reference design for users to make their own boards. What I have seen on other platforms is the development kit comes with all the added components and the design is open source for users to pick and choose what they need in their final product. What a waste of time to convert your product from RPI3 to CM3. Not doing it!!!!

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 1734
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: SDIO for Wifi/Bluetooth module

Tue May 23, 2017 8:25 am

I am not sure if it is just me but I don't get the logic of removing all the network peripherals in the name of industrial use which make this SBC standout among others.
I assume you are talking about the Compute Module (you don't say). If you don't understand the usefulness of the CM then you aren't the target market. Think of it as a processor and some RAM on a plug-in card, which allows lower risk product development because:

1. The CPU and RAM are likely to be the most expensive elements in a design, so if you build a bad board you save the cost of having to scrap them.
2. The layout between the CPU and RAM is probably the most timing critical, and the CM is known to work.
3. You get the same software support as the other Raspberry Pi models.
4. You are very unlikely to be able to source any of the BCM283* processors for your own projects.
The cherry on top is that there is no documentation or reference design for users to make their own boards.
Do the schematics and design files here not count?

Yes, the Compute Module isn't for everybody, but NEC felt it was sufficiently useful to put a CM socket in their professional displays.

Killertechno
Posts: 130
Joined: Wed Jan 02, 2013 8:28 am

Re: SDIO for Wifi/Bluetooth module

Mon Jan 22, 2018 5:01 pm

Sorry guys, I hope to not bother nobody....
I'm migrating from ZeroW and I'm trying to avoid to use CM -> USB connector -> USB connector -> WiFi module.
Are there WiFi modules (only 2,4 or both 2,4/5 GHz) compatible with Raspberry CM?
I'm a bit confused, I can find a lot of WiFi modules with SDIO interface, but I can't find drivers and/or instruction about devicetree.....
So, except ESP8266, are there any known WiFi modules with SDIO interface correctly working with CM?
Thansk.

GAMELASTER
Posts: 38
Joined: Sat Feb 14, 2015 8:05 pm

Re: SDIO for Wifi/Bluetooth module

Wed Jan 24, 2018 7:34 am

Killertechno wrote:
Mon Jan 22, 2018 5:01 pm
Sorry guys, I hope to not bother nobody....
I'm migrating from ZeroW and I'm trying to avoid to use CM -> USB connector -> USB connector -> WiFi module.
Are there WiFi modules (only 2,4 or both 2,4/5 GHz) compatible with Raspberry CM?
I'm a bit confused, I can find a lot of WiFi modules with SDIO interface, but I can't find drivers and/or instruction about devicetree.....
So, except ESP8266, are there any known WiFi modules with SDIO interface correctly working with CM?
Thansk.
Hello, is known that RTL8723BS (2USD WiFi/BT module with SDIO) you can run on Raspberry Pi / Compute module,
https://hackaday.io/project/9934-raspbe ... bs-wifi-bt
WiFi drivers are in main-line kernel in staging, but there is also way to build is yourself:
https://github.com/hadess/rtl8723bs
https://github.com/NextThingCo/RTL8723BS
https://github.com/lwfinger/rtl8723bs_bt

uatechsys
Posts: 2
Joined: Mon May 22, 2017 8:15 pm

Re: SDIO for Wifi/Bluetooth module

Fri Apr 13, 2018 10:14 pm

@PhilE

yes, the minimal development board design count. However, the standard practice by board manufacturers is to provide a fully loaded development board so that people can easily strip out what they don't need. I have been waiting to see if anybody out there has came up with a stable solution to add wifi. bluetooth or any other communication peripherals. But I am sorry to say all I see is thousands of people still trying to figure this out without much luck. If RPI team already has a solution then why not put it on so developers can get the fastest time to the market for their product. I am really looking forward to a change here.

KrashRekovery
Posts: 7
Joined: Wed Apr 11, 2018 3:50 pm

Re: SDIO for Wifi/Bluetooth module

Fri Apr 20, 2018 6:12 pm

I'm trying to add the LBEE5KL1DX to a carrier board I have designed. I have mapped all the SDIO pins to the CM3 (GPIO34-39, Alt 3 configuration). Per the recommendation in this thread.

I have updated my build and added the sdio-sdhost.dtb file per the thread. When I go to compile it I get the following error:
root@raspberrypi:/home# dtc -@ -I dts -O dtb -o sdio-sdhost.dtb sdio-sdhost.dts
sdio-sdhost.dtb: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
sdio-sdhost.dtb: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property

I'm a H/W guy, not a S/W guy so I will admit I'm a bit out of my element here.

I control the GPIO pin that enables the chipset, so I need to be able to turn it on and off, so I need the ability to poll every second to see if its on or off. So I added the following to the end of /boot/config.txt

dtoverlay=sdio,poll_once=no

Any suggestions?

John Westlake
Posts: 41
Joined: Thu Nov 09, 2017 4:34 am

Re: SDIO for Wifi/Bluetooth module

Thu Apr 26, 2018 11:18 pm

I must confess to being a little lost here - does not the RPi3 use the secondary SDIO interface to communicate with its WiFi Chip? If so why is RPi not being more forward with supporting Compute Module owners - it seems they have already done all the leg work developing drivers etc. and yet are selling hardware for industrial user but not really forthcoming with support.

I'm presuming that the eMMC is in the Primary SDIO, so the secondary SDIO WiFi interface wound just be RPI3 like?,

Why not support us Pro users with info on how to interface WiFi to the secondary SDIO port thus helping us to save the rather restricted USB Bandwidth...

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