MPU nteraction with a Endpointrest through wifi

[SigmaPrime]

Hello everyone,

I received my STM32MP157C-DK2 device and I built a Buildroot-image and flashed it successfully.

I am new to STM32 and to the IoT field so perhaps you can orient me and tell me which Programs I need to do so. I want to write a "hello_world" program that sends hello_world every x-seconds to an Endpoint-rest through Wifi.

Is it possible to only use Linux Bash/Shell interface to execute my Program? (I am familiar to these) and like I said I am only testing some features here like the ability of the DK2 to interact with Endpoint-rests.

Thank you all and have a nice day.

[Olivier GALLIEN]

Hi @SigmaPrime​ ,

If you are new to STM32MP1 I recommend you to go through our wiki.

You can find some resource regarding Wifi setup.

https://wiki.st.com/stm32mpu/wiki/How_to_setup_wifi_connection

https://wiki.st.com/stm32mpu/wiki/How_to_configure_a_wlan_interface_on_hotspot_mode

None related to endpoint-rest but maybe it can give you better view of MP1.

Else please be aware that we are only supporting Yocto based solution, not Buildroot.

For this we can recommend some partners.

Olivier

[SigmaPrime]

Thank you for your response

Actually I am having trouble dealing with Buildroot and Wi-Fi connection. The patches installed and given by Buildroot are not actual.

For someone newly introduced to buildroot I made some research and had some basic knowledge but some specific things like installing new patches and configuring drivers are not detailed and I try since 1 week to connect my board to Wi-Fi.

This is what I get every time :

Successfully initialized wpa_supplicant

nl80211: 'nl80211' generic netlink not found

Failed to initialize driver 'nl80211'

wlan0: Unsupported driver 'nl80211'

FAIL

When I lshw I get: 

lshw -class network *

-network description: Ethernet interface physical id: 1 logical name: eth0 serial: 00:80:e1:42:6b:16 size: 1Gbit/s capacity: 1Gbit/s capabilities: ethernet physical tp aui bnc mii fibre 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=st_gmac driverversion=Jan_2016 duplex=full ip=192.168.8.15 link=yes multicast=yes port=MII speed=1Gbit/s

My kernel and system Configurations are more than correct and I enable all needed features.

[Fee]

Hi,

for the On-Chip wifi module of the STM32MP157c-dk2 you must enable the broadcom FullMAC WLAN driver and its SDIO bus interface (the brcmfmac module is used) in the linux-menuconfig.

In buildroot you have to activate the 'Broadcom BRCM bcm43xx' firmware at Target packages -> Hardware handling -> Firmware -> linux firmware -> Wifi firmware. Also you will need a .txt file to load the firmware. I got this one from the ST Starter Package cause it is not available in the buildroot package. Just search for 'brcmfmac43430-sdio.txt'. I tried this one (https://raw.githubusercontent.com/RPi-Distro/firmware-nonfree/master/brcm/brcmfmac43430-sdio.txt) too wich worked as well, I did not test it though. You will see in the dmesg which .txt file is needed.

[MBrei.4]

Dear @Lukas Brückner​,

thanks for the instructions!

When using 'brcmfmac43430-sdio.txt' as you suggested, you need to activate the 'Broadcom BRCM bcm43***' firmware at Target packages instead of 'Broadcom BRCM bcm43xx'. Otherwise 'brcm/brcmfmac43430-sdio.bin' will not be available on the target.

[SigmaPrime]

As you can see everything is on .. But how do I upload the .txt file ? do I have to do that before or after the build. If after then were (in which folder)

 

[Fee]

It goes to /lib/firmware/brcm on your target after building (you can use the buildroot overlay function for example). Buildroot will also copy the bcrm firmware to that folder, be sure to enable it, too.

[SigmaPrime]

Blocked ... I did everything but still nothing

Activated Broadcom FullMAC WLAN driver as module ( <M>)

Activated SDIO bus interface support for FullMAC driver

Activated wpa_supplicant dhcp etc ...

for the driver I

1- git clone git://github.com/murata-wireless/cyw-fmac-fw.git;protocol=https;nobranch=1;name=murata;destsuffix=murata

2- git checkout -b 8d87950bfad28c65926695b7357bd8995b60016a

3- got the .txt file from: https://github.com/STMicroelectronics/meta-st-stm32mp/blob/dunfell/recipes-kernel/linux-firmware/linux-firmware/brcmfmac43430-sdio.txt?fbclid=IwAR1KtSo4XzA8mV_tbL9ERkdBMduSwtbBed66_5tMDpq5D_wpFy69FSClC_s

4 - my brcm directory on my target device (STM32MP157C-DK2) looks like in the photo I uploaded

I don't know what is not working here.

I can share my interfaces and wpa_supplicant files. Maybe there is a fault there but I don't thing so.

[SigmaPrime]

yeah but I did everything right. the download part was a supplement.

ifconfig -a does not output wlan0

I only have sit0 lo and eth0

Some detail I may want to share is that in linux-menuconfig under

> Networking support > Wireless I get a "-*-" in front of "Wireless" and not a [*]

[Fee]

Some detail I may want to share is that in linux-menuconfig under

> Networking support > Wireless I get a "-*-" in front of "Wireless" and not a [*]

That just means the wifi got selected from another option that depends on it.

Are you using the ST provided kernel (https://github.com/STMicroelectronics/linux)?

Maybe the dmesg output will help you as well.

[SigmaPrime]

so the "-*-" is not a sign of error or somth ?

No I am using Buildroot's kernel as I explained.

[shane mattner]

Thank you @Lukas Brückner​  for the detailed troubleshooting steps. I tried the above steps and also still cannot get WiFi working on the STM32MP157-DK2 with Buildroot. I think perhaps I got 1 step farther than SigmaPrime because my error changed from

Successfully initialized wpa_supplicant
nl80211: 'nl80211' generic netlink not found
Failed to initialize driver 'nl80211'
wlan0: Unsupported driver 'nl80211'

To:

# wpa_supplicant -B -i wlan0 -W -D nl80211, wext -c /etc/wpa_supplicant.conf
Successfully initialized wpa_supplicant
Could not read interface wlan0 flags: No such device
nl80211: Driver does not support authentication/association or connect commands
nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Could not read interface wlan0 flags: No such device
wlan0: Unsupported driver ''

This change happened after I turned on 80211 support on the linux-menuconfig of Buildroot

There's not much in the DTS or DTSI that mentions wifi (unlike ethernet that has all it's pins mapped). Could this be an issue?

[Fee]

Hi @shane mattner​ ,

I am unable to test right now, but as far as I could look it up you should have that in your stm32mp157c-dk2.dts file (I didn't put it there, this is shipped with the ST Kernel (https://github.com/STMicroelectronics/linux):

/* Wifi */
&sdmmc2 {
	arm,primecell-periphid = <0x10153180>;
	pinctrl-names = "default", "opendrain", "sleep";
	pinctrl-0 = <&sdmmc2_b4_pins_a>;
	pinctrl-1 = <&sdmmc2_b4_od_pins_a>;
	pinctrl-2 = <&sdmmc2_b4_sleep_pins_a>;
	non-removable;
	st,neg-edge;
	bus-width = <4>;
	vmmc-supply = <&v3v3>;
	mmc-pwrseq = <&wifi_pwrseq>;
	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";
 
	brcmf: bcrmf@1 {
		reg = <1>;
		compatible = "brcm,bcm4329-fmac";
	};
};

So your wifi should be indeed mentioned in your device tree. Are you trying to use the mainline kernel (aka the one buildroot suggests you by default)? The mainline one seems not to have it. As you can sse in the device tree, the driver used for the wifi should be the bcm4329-fmac.

Besides the device tree and the above mentioned device drivers I can share my Network support -> Wireless settings (see picture).

Hope it helps!

[Olivier GALLIEN]

Hi all, @SigmaPrime​ , @shane mattner​ 

Did you try to get some help from murata/cypress ?

Very active support for Cypress forum :

https://community.cypress.com/welcome

Other links :

BT: https://github.com/murata-wireless/cyw-bt-patch

WLAN: https://github.com/murata-wireless/cyw-fmac-fw

Hope it help,

Olivier

[SigmaPrime]

Hi

Well I managed to work it out alone actually with the help of a friend.

The solution concerns people using buildroot.

1) Invoke the Kernel configuration utility using make linux-menuconfig in your Buildroot directory on

your host machine.

2) Enable Wireless Networking support under Networking support

3) Enable cfg80211 - wireless configuration API, and Generic IEEE 802.11 Networking Stack

(mac80211), under Networking Support,Wireless

4) Enable EEPROM 93CX6 support under Device Drivers, Misc devices, EEPROM support. Required

for RTL8187 module in my Wi-Fi dongle, may not be needed for your particular adapter

5) Enable Wireless LAN driver support under Device Drivers, Network device support

6) Invoke make menuconfig within the buildroot folder from a command prompt

7) Select package iw required to configure wireless networking, under Target packages, Networking applications.

Enable iproute2 if you want to use the ip utility instead of ifconfig.

9) Select package wpa_supplicant and its sub-packages for WPA/WPA2 support:

- Install wpa_cli binary

- Install wpa_passphrase binary

- Enable Support for soft Ap

9) Activated Broadcom FullMAC WLAN driver as module ( : Press space several time to change it)

10) Activated SDIO bus interface support for FullMAC driver

11) Activated wpa_supplicant dhcp

12) go to /lib/firmware and create a directory name firmware

13) git clone git://github.com/murata-wireless/cyw-fmac-fw.git;protocol=https;nobranch=1;name=

murata;destsuffix=murata

14) git checkout -b 8d87950bfad28c65926695b7357bd8995b60016a. If you wnt to check the version then

use:

sha256sum brcmfmac43430-sdio.bin

3ea748266c78351880d6389d672bd22eb0e13629c0607b5010a4a410d1395548 brcmfmac43430-sdio.bin

15) get the .txt file from git repository of ST and put the .bin and .txt file on the /lib/firmware/brcm

directory.

16) copy the brcm43430-sdio.1DX.clm_blob to /lib/firmware/brcm and rename it to brcmfmac43430-

sdio.clm_blob

17) make

18) flash your sdcard with the new image

19) Wifi Setup on the target machine

20) make

21) flash your sdcard with the new image

**Wifi Setup on the target machine**

23) Use wpa_passphrase MYSSID passphrase > /etc/wpa_supplicant.con

24) modprobe brcmfmac

25) ifconfig wlan0 up

26) wpa_supplicant -B -iwlan0 -c /etc/wpa_supplicant.conf

# wait a little bit

27) ifconfig -a

[shane mattner]

Are you using an external WiFi module? I'm trying to use the on-board module

I still get the same errors as before. However, I discovered in Buildroot menuconfig that you have to turn on "Show packages that are also provided by busybox" in order to have DHCP appear as an option.

How did you set up your build environment? I followed Bootlin's guide to STM32MP157-DK2.

Can you provide your .config for the menuconfig and linux-menuconfig?

[SigmaPrime]

I enumerated the steps in my previous command. The murata firmware is not recognized by buildroot that's why I downloaded one.

Here is the package config file