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How to interface an I2S microphone with Beaglebone Black(BBB)

10 minutes, 23 seconds read

 I have been writing a large variety of computer programs since a long time, but there was this question, the answer to which was elusive for a long time.

  • How are they converted to binary data, and how is that interpreted by my computer?
  • How do we create devices, and how do they work?

My fascination started with a smart wall clock (http://ingrein.com) that I thought was a very cool gadget to have at home. I wanted to build something like that on my own, but didn’t had know how. So I started on a journey to learn embedded systems and their functioning.

I moved from Arduino to Raspberry Pi, and then to RedBear Duo, learning new things at every step. And then finally came BeagleBone Black. I had always wondered how Linux kernel works, is it something that I can compile on my own, and execute? I have been trying to solve this problem for so long and I want to thank Pavel Botev for helping me out on this.

BeagleBone Black (BBB) comes with a TI processor AM3358. So in order to build Linux kernel for this board, you will need TI SDK that can be downloaded at http://www.ti.com/tool/PROCESSOR-SDK-AM335X.

You will need to download and install the binary (Linux Processor SDK for AM335x) from the link above. Help on installation is available here — http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/index.html.

There are two distinct steps in the installation of SDK. First setting the execute permission on the SDK bin file, and second to execute it.

$ chmod +x ./ti-processor-sdk-linux-[platformName]-evm-xx.xx.xx.xx-Linux-x86-Install.bin
$ ./ti-processor-sdk-linux-[platformName]-evm-xx.xx.xx.xx-Linux-x86-Install.bin

Once the TI Processor SDK is installed, you will find the following file structure in the install location.


This SDK contains both the Linux kernel, and the Root File System, and other cross compile binaries (compiler) to compile the kernel. Assuming ti-processor-sdk-home is the SDK install location, you will find the kernel files at

<ti-processor-sdk-home>/board-support/linux-4.9.69+gitAUTOINC+xxxx (The exact version may vary depending on the version of the processor SDK)

and the RFS at


You can copy these to separate folders so you always have the original SDK copy. In case anything goes wrong, and you want to restart from beginning, you have the kernel, and RFS that you can copy again from the Processor SDK.

Lets assume you copied the kernel files to location ~/linux-4.9.69, and changed your current directory to where you copied the kernel.

$ cd ~/linux-4.9.69

Before you compile the kernel, we must prepare the kernel by telling what is the board that we want to compile the kernel for? In other words you define the configuration by selecting appropriate defconfig file. For BeagleBone Black, we need to use “tisdk_am335x-evm_defconfig”. All config files are present in arch/arm/configs folder.

Command for setting this configuration is

$ make ARCH=arm CROSS_COMPILE=<ti-processor-sdk-home>/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf- tisdk_am335x-evm_defconfig

Please note the space between “arm-linux-gnueabihf-” and “tisdk_am335x-evm_defconfig” in the above command.

You may want to configure your linux distribution further by informing the compiler what all files/modules should be included for compilation. “menuconfig” is the target for this configuration, and the full command to run menuconfig is below.

But before you run menuconfig target, there is one more step. We need to tell menuconfig what all options should be shown in menuconfig, and how. Though most of the settings are good by default, we need to do one change in the kernel

$ vi ti-processor-sdk-home/board-support/linux-4.9.69+gitAUTOINC+xxxx/sound/soc/codecs/Kconfig

Find line

config SND_SOC_PCM5102A

And replace it with

config SND_SOC_PCM5102A
       tristate "Texas Instruments PCM5102a Dummy Codec Driver"

The above line “Texas Instruments PCM5102a Dummy Codec Driver” helps you identify the codec in the menuconfig stage.

Finally run “menuconfig” target with the following command.

$ make ARCH=arm CROSS_COMPILE=<ti-processor-sdk-home>/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf- menuconfig

Please note again that menuconfig is the target name, and the value for CROSS_COMPILE flag ends with a hyphen as “arm-linux-gnueabihf-”. There should be space between “arm-linux-gnueabihf-” and “menuconfig”.

Running “menuconfig” target opens up a menu through which you can select which modules you would like to be compiled in-line, i.e. along with rest of kernel code, and which ones to be compiled, and included as modules. Mark module PCM5102a to be inline compiled along with other kernel files.

Now in order to compile the Linux Kernel, you have the kernel source files, and the cross compile binaries needed to compile the source. Compile the kernel using

$ cd ~/linux-4.9.69
$ make ARCH=arm CROSS_COMPILE=<ti-processor-sdk-home>/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf- uImage LOADADDR=0x80008000 -j4

The above command compiles the kernel and keeps the image at arch/arm/boot/uImage. You can copy this image and flash it to the board, or transfer it via tftp. I shall explain the process of using tftp later.

The device tree source files are present in linux-4.9.69/arch/arm/boot/dts folder in the kernel. The device tree is the code that tells the kernel what all hardware is available on the board, and how is it configured.

Before we compile the device tree, we need to know which device tree we will be using. As this experiment is about BBB, it is obvious that BeagleBone’s device tree should be used. It is present as linux-4.9.69/arch/arm/boot/dts/am335x-boneblack.dts.

But we want to interface an I2S mems microphone (SPH0645LM4H, https://www.adafruit.com/product/3421) with BBB, we will need to tell the device tree of its presence, and its configuration. We will include all microphone related configuration in a separate DTSI file (include file, which can be included in the parent device tree source).

$ vi am335x-boneblack-pcm5102a.dtsi

The content of this include file is as below

* Copyright(C) 2016 Texas Instruments Incorporated- http://www.ti.com/
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
&am33xx_pinmux {
 mcasp1_pins: mcasp1_pins{
  pinctrl-single,pins = <
   /* sink must enable receivers */
   AM33XX_IOPAD(0x9a0, PIN_INPUT_PULLDOWN | MUX_MODE3) /* P9_42 mcasp1_aclkx - bit clock */
   AM33XX_IOPAD(0x9a4, PIN_INPUT_PULLDOWN | MUX_MODE3) /* P9_27 mcasp1_fsx - frame sync */
   AM33XX_IOPAD(0x9a8, PIN_INPUT_PULLDOWN | MUX_MODE3) /* P9_41 mcasp1_axr0 - i2s input */
&mcasp1 {
 #sound-dai-cells = <0>;
 pinctrl-names = "default";
 pinctrl-0 = <&mcasp1_pins>;
 status = "okay";
 op-mode = <0>; /* MCASP_IIS_MODE */
 tdm-slots = <2>;
 num-serializer = <4>;
 serial-dir = < /* 1 TX 2 RX 0 unused */
  2 1 0 0
 rx-num-evt = <32>;
 tx-num-evt = <32>;
/ {
 pcm5102a: pcm5102a {
  #sound-dai-cells = <0>;
  compatible = "ti,pcm5102a";
  status = "okay";
clk_mcasp1_fixed: clk_mcasp1_fixed {
  #clock-cells = <0>;
  compatible = "fixed-clock";
  clock-frequency = <24576000>;
clk_mcasp1: clk_mcasp1 {
  #clock-cells = <0>;
  compatible = "gpio-gate-clock";
  clocks = <&clk_mcasp1_fixed>;
  enable-gpios = <&gpio1 27 0>; /* BeagleBone Black Clk enable on GPIO1_27 */
sound1:sound@1 {
  compatible = "simple-audio-card";
  simple-audio-card,name = "PCM5102a";
  simple-audio-card,format = "i2s";
  simple-audio-card,bitclock-master = <&sound1_master>;
  simple-audio-card,frame-master = <&sound1_master>;
sound1_master: simple-audio-card,cpu {
   sound-dai = <&mcasp1>;
   system-clock-direction = "out";
   system-clock-frequency = <24576000>;
   clocks = <&clk_mcasp1>;
   sound-dai = <&pcm5102a>;
   #sound-dai-cells = <0>;

Now we need to include this “am335x-boneblack-pcm5102a.dtsi” file in “am335x-boneblack.dts”. Just add this line at the end of “am335x-boneblack.dts”.

#include "am335x-boneblack-pcm5102a.dtsi"

The device tree can be compiled using

$ cd ~/linux-4.9.69 
$ make ARCH=arm CROSS_COMPILE=<ti-processor-sdk-home>/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf- dtbs

The above command will result in a device tree binary within arch/arm/boot/dts/ folder. The file is named am335x-boneblack.dtb

Lets now talk about how the MEMS microphone should be wired up. We can focus only on the BeagleBone column of the image below.


Booting the BBB

Now that all configuration is setup, we should march ahead with booting of your BBB. But wait, what you have is a kernel image (uImage) and a device tree binary (am335x-boneblack.dtb). But how do we send these to our BBB?

Instead of flashing the kernel, device tree, and the RFS to an SD card, and then putting the SD card to BBB, we will makes these available to BBB directly from the host computer via TFTP (for uImage, & DTB) and NFS (for RFS).


We will use TFTP to provide the kernel image, and DTB to the BBB. Go ahead and install TFTP on your host computer.

sudo apt-get install tftpd-hpa

Now let us configure TFTP and tell it the location of the files we need to transfer to the BBB. TFTP configuration files is present as/etc/default/tftpd-hpa. Example configuration is below

# /etc/default/tftpd-hpa
TFTP_OPTIONS="--secure --create"

The above configuration makes “/home/parag/linux-4.9.69/arch/arm/boot” as TFTP_DIRECTORY, which is the default directory where tftp looks for files that it can transfer. TFTP is not known to work very well with nested directories, so we must ensure that both files (uImage, and DTB) are available in this directory.

As uImage is created in above directory itself, so its not a problem, and TFTP can easily transfer it. However DTB is formed within boot/dts. We can create a symbolic link in the boot itself, and make it point to DTB file present in dts directory to make it work.

ln -s dts/am335x-boneblack.dtb am335x-boneblack.dtb

Sharing RFS (Root File System) over NFS (Network File System)

RFS or the Root File System contains binaries that you typically see in any linux distribution. RFS is made available by TI SDK as indicated early in this article. You can just copy those files from SDK, and keep it at a desired location from where you can share them over network via NFS.

NFS server can be installed on ubuntu host computer with the following commands

sudo apt-get update
sudo apt-get install nfs-kernel-server

Once NFS is installed, you can proceed with its configuration. Edit /etc/exports

sudo vim /etc/exports

You can configure the above file with the following setting

/home/parag/bbone/rootfs        *(rw,sync,no_root_squash,no_subtree_check)

Note, I have kept my RFS files in /home/parag/bbone/rootfs. You change this setting depending upon where you have copied the RFS files to.

Finally, booting the BBB!!

After all this hard work, its time to see the magic. Connect BBB with LAN cable, and connect it to the same network as your host computer.

Power up the BBB. Assuming you have minicom or any other serial monitor set up, you should be able to see the uboot logs. Immediately press space key so the bootloader (uboot) does not boot the kernel available in BBB, but stops for further commands. Type commands as below to help BBB connect to the network.

>setenv autoload no
>setenv serverip 
>setenv gatewayip

I have used as IP of my host computer, and as the gateway. You will need to choose these according to your setup. Finally dhcp command will help BBB to be allocated an IP address from your router.

If everything goes on file, you will see output from BBB uboot that an IP has been assigned. Next command as follows

>tftpboot 0x80F80000 am335x-boneblack.dtb && tftpboot 0x80007FC0 uImage

The above command instructs u-boot to download the device tree image from the serverip instructed earlier, and copy the same to address 0x80F80000 in RAM. Kernel uImage is also downloaded from the host serverip and copied to 0x80007FC0.

Boot, finally!!

The last two commands to start the boot process are as below

>setenv bootargs console=ttyO0,115200n8 noinitrd rw ip=dhcp root=/dev/nfs nfsroot= nfsrootdebug earlyprintk
>bootm 0x80007FC0 - 0x80F80000

The first command above sets up the bootargs. Change the setting as per your environment. The last command starts the boot process.

Soon you should see the kernel boot to complete, and a login prompt to appear. Login using root as user. No password should be needed.

Unexpected Signal on P9_41 :(

Now you will find (on your oscilloscope) that the moment you boot the kernel, you start getting a signal (square wave) on the data pin (P9–41). Ideally there should be no signal on the data pin till you start recording using the “arecord” command.

Here is the link to get the zoom version for this image below.

You would notice there is pinmux settings for clkout2 (mode 3) for Pin P9_41A which is the data pin. We need to disable this setting so that data pin receives only the data we record from microphone, and not from any other source.

The above observation is because of a configuration in the am335x-bone-common.dtsi (a file included in am335x-boneblack.dts).

pinctrl-names = "default"
pinctrl-0 = <&clkout2_pins>

It is this line `pinctrl-0 = <&clkout2_pins>` that causes the signals on data pin. We need to comment this out like below.

pinctrl-names = "default"
/*pinctrl-0 = <&clkout2_pins>*/

After this above change, we need to build again the device tree, and reboot the kernel. The data pin should not have any signal now till we start recording with the command.

$ arecord -Dhw:1,0 -f S32_LE -t wav -c 1 -d 60 -vvv /tmp/audio.wav

The above command shall start recording mono sound (single channel) at /tmp/audio.wav. The above command’s -D flag (-Dhw:1,0) assumes your PCM5102a sound card is listed at index 1. This index can be confirmed by listing down all cards and seeing the output of the command below

$ arecord -l

If you found this article helpful, let me know in the comment section below.


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The ‘Cyber Attacks’ Winter is Coming — straight for small firms in India Inc.

5 minutes read

Cyber intrusions and attacks have increased exponentially over the last decade approximately, exposing sensitive information pertaining to people and businesses, thus disrupting critical operations, and imposing huge liabilities on the economy. 

Cybersecurity is a responsibility that employees and leaders across functions must shoulder simply because it is the gospel truth – you cannot protect what you cannot see. As organizations have shifted to the work-from-home model due to the outbreak of the COVID-19 pandemic, it’s increasingly important to keep your company’s data secure. 

While the pandemic has led to near or complete digitalization of operations amongst financial institutions, it’s also increased the potential for cyberattacks that lead to adverse financial, reputational, and/or regulatory implications for organizations. 

According to Accenture, cybercrime is said to cost businesses $5.2 trillion worldwide within five years. “With 43% of online attacks now aimed at small businesses, a favorite target of high-tech villains, yet only 14% prepared to defend themselves, owners increasingly need to start making high-tech security a top priority,” the report continues.

A recent McAfee study shows global cybercrime costs crossed US$1 trillion dollars in 2020, up almost 50% from 2018.

India too saw an exponential rise in cybersecurity incidents amid the coronavirus pandemic. Information tracked by the Indian Computer Emergency Response Team (CERT-In) showed that cybersecurity attacks saw a four-fold jump in 2018, and recorded an 89 percent growth in 2019.

The government has set up a Cyber Crisis Management Plan for countering cyber-attacks effectively, while also operating the Cyber Swachhta Kendra (Botnet Cleaning and Malware Analysis Centre).

Banks and Financial Institutions (FIs) are some of the highest targeted market sectors. An analysis by FitchRatings in collaboration with SecurityScorecard reveals that banks with higher credit ratings exhibited better cybersecurity scores than banks with lower credit ratings. 

Bharti Airtel’s chief executive officer for India, Gopal Vittal, in a letter to the telco’s 307.9 million subscribers, detailed out how Airtel is carrying out home delivery of SIM cards and cautioned subscribers from falling prey to cyber frauds. He cautioned them against the rapid rise in cyber frauds, highly likely via digital payments. “There has been a massive increase in cyber frauds. And as usual, fraudsters are always finding new ways to trick you,” he added in the letter. 

Barcelona-based Glovo, valued at over $1 billion, that delivers everything from food to household supplies to some 10 million users across 20 countries, came under attack recently when the “hacker gained access to a system on April 29 via an old administrator platform but was ejected as soon as the intrusion was detected”, according to the company.

The attack came less than a month after Glovo raised 450 million euros ($541 million) in funding. 

According to Kaspersky’s telemetry, close on the heels of coronavirus-led pandemic and subsequent lockdown in March 2020, saw a total number of meticulously planned attacks against remote desktop protocol (RDP) jumped from 93.1 million worldwide in February 2020 to 277.4 million 2020 in March — a whopping 197 percent increase. In India, the numbers went from 1.3 million in February 2020 to 3.3 million in March 2020. In July 2020, India recorded its highest number of cyberattacks at 4.5 million.

The recent data breach at the payment firm Mobikwik, affected 3.5 million users, exposing Know Your Customer (KYC) documents such as addresses, phone numbers, Aadhaar card details, PAN card numbers, and so on. The company, however, still maintains that there was no such data breach. It was only after the Reserve Bank of India’s intervention that Mobikwik got a forensic audit conducted immediately by a CERT-IN empaneled auditor and submitted the report. 

Security experts have observed a 500% rise in the number of cyber attacks and security breaches and a 3 to 4 times rise in the number of phishing attacks from March until June 2020.

These attacks, however, are not just pertaining to the BFSI sector, but also the healthcare sector, and the education sector.

Image Source: BusinessStandard.com

What motivates hackers to target SMBs? 

Hackers essentially target SMBs because it’s a source of easy money. From inadequate cyber defenses to lower budgets and/or resources, smaller businesses often lack strong security policies, cybersecurity education programs, and more, making them soft targets. 

SMBs can also be a ‘gateway’ to larger organizations. As many SMBs are usually connected electronically to the IT systems of larger partner organizations, it becomes an inroad to the bigger organizations and their data. 

How can companies shield themselves from a potential cyberattack: 

As a response to the rising number of attacks in cyberspace, the Home Ministry of India issued an advisory with suggestions on the prevention of cyber thefts, especially for the large number of people working from home. Organizations and key decision-makers in a company can also create an effective cybersecurity strategy that’s flexible for adaptation in a changing climate too. Here are a few use cases: 

  • CERT-In conducted ‘Black Swan – Cyber Security Breach Tabletop Exercise’, in order to deal with cyber crisis and incidents emerging amid the COVID-19 pandemic, resulting from lowered security controls. 
  • To counter fraudulent behavior in the finance sector, the government is also considering setting up a Computer Emergency Response Team for the Financial Sector or CERT-Fin.
  • Several tech companies have come forth to address cybersecurity threats by building secure systems and software to mitigate issues like these in the foreseeable future. For example, IBM Security has collaborated with HCL Technologies to streamline threat management for clients through a modernized security operation center (SOC) platform called HCL’s Cybersecurity Fusion Centres. 

Some of the ways through which companies can mitigate potential risks include: 

  • Informing users of hacker tactics and possible attacks
  • Establish security rules, create policies, and an incident response plan to cover the entire gamut of their operations
  • Basic security measures such as regularly updating applications and systems
  • Following a two-factor authentication method for accounts and more

While these measures are some of the ways to be on top of your game in the cybersecurity space, they will also help in sound threat detection while helping gain better insights into attacks and prioritizing security alerts so that India is better prepared for an oncoming attack and battling any unforeseen circumstance that might result in huge loss of data, resources and more. 


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