Embitude's Linux SPI Drivers Training Slides. Contains the details of AM335X specific low level programming, SPI components such as SPI Master Driver, SPI Client Driver, Device Tree for SPI
Covers the basics of Direct Memory Access (DMA). Further to this, the generic Linux DMA engine is covered along with steps to initiate the DMA transfer
The U-Boot is an "Universal Bootloader" ("Das U-Boot") is a monitor program that is under GPL. This production quality boot-loader is used as default boot loader by several board vendors. It is easily portable and easy to port and to debug by supporting PPC, ARM, MIPS, x86,m68k, NIOS, Microblaze architectures. Here is a presentation that introduces U-Boot.
The slides begins with introduction to the character drivers and then mentions the various APIs for registering the character driver. Dynamically creating the device file and IOCTL
Covers the basics of Direct Memory Access (DMA). Further to this, the generic Linux DMA engine is covered along with steps to initiate the DMA transfer
The U-Boot is an "Universal Bootloader" ("Das U-Boot") is a monitor program that is under GPL. This production quality boot-loader is used as default boot loader by several board vendors. It is easily portable and easy to port and to debug by supporting PPC, ARM, MIPS, x86,m68k, NIOS, Microblaze architectures. Here is a presentation that introduces U-Boot.
The slides begins with introduction to the character drivers and then mentions the various APIs for registering the character driver. Dynamically creating the device file and IOCTL
Have a quick overview of most of the embedded linux components and their details. How ti build Embedded Linux Hardware & Software, and developing Embedded Products
Note: When you view the the slide deck via web browser, the screenshots may be blurred. You can download and view them offline (Screenshots are clear).
This course gets you started with writing device drivers in Linux by providing real time hardware exposure. Equip you with real-time tools, debugging techniques and industry usage in a hands-on manner. Dedicated hardware by Emertxe's device driver learning kit. Special focus on character and USB device drivers.
SFO15-TR9: PSCI, ACPI (and UEFI to boot)
Speaker: Bill Fletcher
Date: September 24, 2015
★ Session Description ★
An introductory session of a system-level overview at Power State Coordination
- Focus on ARMv8
- Goes top-down from ACPI
- A demo based on the current code in qemu
- The specifications are very dynamic - what’s onging for ACPI and PSCI
★ Resources ★
Video: https://www.youtube.com/watch?v=vXzPdpaZVto
Presentation: http://www.slideshare.net/linaroorg/sfo15tr9-psci-acpi-and-uefi-to-boot
Etherpad: pad.linaro.org/p/sfo15-tr9
Pathable: https://sfo15.pathable.com/meetings/303087
★ Event Details ★
Linaro Connect San Francisco 2015 - #SFO15
September 21-25, 2015
Hyatt Regency Hotel
http://www.linaro.org
http://connect.linaro.org
Have a quick overview of most of the embedded linux components and their details. How ti build Embedded Linux Hardware & Software, and developing Embedded Products
Note: When you view the the slide deck via web browser, the screenshots may be blurred. You can download and view them offline (Screenshots are clear).
This course gets you started with writing device drivers in Linux by providing real time hardware exposure. Equip you with real-time tools, debugging techniques and industry usage in a hands-on manner. Dedicated hardware by Emertxe's device driver learning kit. Special focus on character and USB device drivers.
SFO15-TR9: PSCI, ACPI (and UEFI to boot)
Speaker: Bill Fletcher
Date: September 24, 2015
★ Session Description ★
An introductory session of a system-level overview at Power State Coordination
- Focus on ARMv8
- Goes top-down from ACPI
- A demo based on the current code in qemu
- The specifications are very dynamic - what’s onging for ACPI and PSCI
★ Resources ★
Video: https://www.youtube.com/watch?v=vXzPdpaZVto
Presentation: http://www.slideshare.net/linaroorg/sfo15tr9-psci-acpi-and-uefi-to-boot
Etherpad: pad.linaro.org/p/sfo15-tr9
Pathable: https://sfo15.pathable.com/meetings/303087
★ Event Details ★
Linaro Connect San Francisco 2015 - #SFO15
September 21-25, 2015
Hyatt Regency Hotel
http://www.linaro.org
http://connect.linaro.org
Building PoC ready ODM Platforms with Arm SystemReady v5.2.pdfPaul Yang
The purpose of this technical talk with the demo is to show ODMs, OEMs, and ISVs how to leverage SystemReady Lab, showcase the use-case based on the virtualization platform for the edge, and deploy open-source tools that set up ODMs to develop their Arm platforms.
The IoT is becoming extremely popular keyword in the industries while there are many different interpretations or various definitions. However, one common requirement is that it requires many Sensor devices connected to Linux devices. The user space drivers for GPIO, I2C/SPI and UART sensors in the past were implemented separately from scratch delicately for each product. This will cause significant challenge of software engineering overhead while GPIO, I2C/SPI and UART sensors are dramatically increasing which have to be supported. The IoTDK is one of the library to provide portability of sensors' driver to solve the situation.
The talk will includes guide of IoTDK and 96Boards and tutorial of programing I2C and GPIO devices. Targeted audiences are who are interested in IoT sensors or who would like to move from Arduino and Raspberry Pi to modern ARM CPU effectively.
This presentation was delivered at LinuxCon Japan 2016 by Akira Tsukamoto.
Do You Like Coffee with Your dessert? Java and the Raspberry Pi - Simon Ritte...jaxLondonConference
Presented at JAX London 2013
The Raspberry Pi has caused a huge wave of interest amongst developers, providing an ARM powered single board computer running a full Linux distro off an SD card and all for only $35! After an introduction to the Raspberry Pi and the ARM architecture, this session will look at how Java can be used on a device like this. Oracle have released an early access preview of JDK8 including JavaFX and a version of Java ME Embedded (3.3) tuned specifically for the Raspberry Pi.
A presentation about UCS and usNIC to the Math & Computer Science and Leadership Computing Facility divisions at Argonne National Laboratory (ANL). Presented to ANL by Dave Goodell (Cisco) on 2014-09-02.
Designing for Privacy in Amazon Web ServicesKrzysztofKkol1
Data privacy is one of the most critical issues that businesses face. This presentation shares insights on the principles and best practices for ensuring the resilience and security of your workload.
Drawing on a real-life project from the HR industry, the various challenges will be demonstrated: data protection, self-healing, business continuity, security, and transparency of data processing. This systematized approach allowed to create a secure AWS cloud infrastructure that not only met strict compliance rules but also exceeded the client's expectations.
Modern design is crucial in today's digital environment, and this is especially true for SharePoint intranets. The design of these digital hubs is critical to user engagement and productivity enhancement. They are the cornerstone of internal collaboration and interaction within enterprises.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
First Steps with Globus Compute Multi-User EndpointsGlobus
In this presentation we will share our experiences around getting started with the Globus Compute multi-user endpoint. Working with the Pharmacology group at the University of Auckland, we have previously written an application using Globus Compute that can offload computationally expensive steps in the researcher's workflows, which they wish to manage from their familiar Windows environments, onto the NeSI (New Zealand eScience Infrastructure) cluster. Some of the challenges we have encountered were that each researcher had to set up and manage their own single-user globus compute endpoint and that the workloads had varying resource requirements (CPUs, memory and wall time) between different runs. We hope that the multi-user endpoint will help to address these challenges and share an update on our progress here.
Your Digital Assistant.
Making complex approach simple. Straightforward process saves time. No more waiting to connect with people that matter to you. Safety first is not a cliché - Securely protect information in cloud storage to prevent any third party from accessing data.
Would you rather make your visitors feel burdened by making them wait? Or choose VizMan for a stress-free experience? VizMan is an automated visitor management system that works for any industries not limited to factories, societies, government institutes, and warehouses. A new age contactless way of logging information of visitors, employees, packages, and vehicles. VizMan is a digital logbook so it deters unnecessary use of paper or space since there is no requirement of bundles of registers that is left to collect dust in a corner of a room. Visitor’s essential details, helps in scheduling meetings for visitors and employees, and assists in supervising the attendance of the employees. With VizMan, visitors don’t need to wait for hours in long queues. VizMan handles visitors with the value they deserve because we know time is important to you.
Feasible Features
One Subscription, Four Modules – Admin, Employee, Receptionist, and Gatekeeper ensures confidentiality and prevents data from being manipulated
User Friendly – can be easily used on Android, iOS, and Web Interface
Multiple Accessibility – Log in through any device from any place at any time
One app for all industries – a Visitor Management System that works for any organisation.
Stress-free Sign-up
Visitor is registered and checked-in by the Receptionist
Host gets a notification, where they opt to Approve the meeting
Host notifies the Receptionist of the end of the meeting
Visitor is checked-out by the Receptionist
Host enters notes and remarks of the meeting
Customizable Components
Scheduling Meetings – Host can invite visitors for meetings and also approve, reject and reschedule meetings
Single/Bulk invites – Invitations can be sent individually to a visitor or collectively to many visitors
VIP Visitors – Additional security of data for VIP visitors to avoid misuse of information
Courier Management – Keeps a check on deliveries like commodities being delivered in and out of establishments
Alerts & Notifications – Get notified on SMS, email, and application
Parking Management – Manage availability of parking space
Individual log-in – Every user has their own log-in id
Visitor/Meeting Analytics – Evaluate notes and remarks of the meeting stored in the system
Visitor Management System is a secure and user friendly database manager that records, filters, tracks the visitors to your organization.
"Secure Your Premises with VizMan (VMS) – Get It Now"
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
Paketo Buildpacks : la meilleure façon de construire des images OCI? DevopsDa...Anthony Dahanne
Les Buildpacks existent depuis plus de 10 ans ! D’abord, ils étaient utilisés pour détecter et construire une application avant de la déployer sur certains PaaS. Ensuite, nous avons pu créer des images Docker (OCI) avec leur dernière génération, les Cloud Native Buildpacks (CNCF en incubation). Sont-ils une bonne alternative au Dockerfile ? Que sont les buildpacks Paketo ? Quelles communautés les soutiennent et comment ?
Venez le découvrir lors de cette session ignite
Listen to the keynote address and hear about the latest developments from Rachana Ananthakrishnan and Ian Foster who review the updates to the Globus Platform and Service, and the relevance of Globus to the scientific community as an automation platform to accelerate scientific discovery.
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...Globus
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I ...Juraj Vysvader
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I didn't get rich from it but it did have 63K downloads (powered possible tens of thousands of websites).
Cyaniclab : Software Development Agency Portfolio.pdfCyanic lab
CyanicLab, an offshore custom software development company based in Sweden,India, Finland, is your go-to partner for startup development and innovative web design solutions. Our expert team specializes in crafting cutting-edge software tailored to meet the unique needs of startups and established enterprises alike. From conceptualization to execution, we offer comprehensive services including web and mobile app development, UI/UX design, and ongoing software maintenance. Ready to elevate your business? Contact CyanicLab today and let us propel your vision to success with our top-notch IT solutions.
TROUBLESHOOTING 9 TYPES OF OUTOFMEMORYERRORTier1 app
Even though at surface level ‘java.lang.OutOfMemoryError’ appears as one single error; underlyingly there are 9 types of OutOfMemoryError. Each type of OutOfMemoryError has different causes, diagnosis approaches and solutions. This session equips you with the knowledge, tools, and techniques needed to troubleshoot and conquer OutOfMemoryError in all its forms, ensuring smoother, more efficient Java applications.
Globus Compute wth IRI Workflows - GlobusWorld 2024Globus
As part of the DOE Integrated Research Infrastructure (IRI) program, NERSC at Lawrence Berkeley National Lab and ALCF at Argonne National Lab are working closely with General Atomics on accelerating the computing requirements of the DIII-D experiment. As part of the work the team is investigating ways to speedup the time to solution for many different parts of the DIII-D workflow including how they run jobs on HPC systems. One of these routes is looking at Globus Compute as a way to replace the current method for managing tasks and we describe a brief proof of concept showing how Globus Compute could help to schedule jobs and be a tool to connect compute at different facilities.
How Does XfilesPro Ensure Security While Sharing Documents in Salesforce?XfilesPro
Worried about document security while sharing them in Salesforce? Fret no more! Here are the top-notch security standards XfilesPro upholds to ensure strong security for your Salesforce documents while sharing with internal or external people.
To learn more, read the blog: https://www.xfilespro.com/how-does-xfilespro-make-document-sharing-secure-and-seamless-in-salesforce/
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...
Spi drivers
1. @ 2021-22 Embitude Trainings <info@embitude.in>
All Rights Reserved
Serial Peripheral Interface (SPI) Drivers
2. @ 2021-22 Embitude Trainings <info@embitude.in>
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What to Expect
●
SPI Overview
●
SPI Character Driver Framework
●
Accessing Hardware Registers
●
Linux SPI Framework
●
SPI Framework Components
●
SPI Client Driver
3. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Overview
●
Suitable for small slow devices
●
SPI is a 4-wire protocol unlike I2C
●
Apart from Serial Clock, Data Lines are 2
●
And an additional Chip Select.
5. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Character Driver Framework
User Space
/dev/spi0
cat,
echo
Char Driver
spi_char.c
Low Level
SPI Driver
low_level_driver.c
App
open(), read(),
write()
my_open() my_read()
spi_rw()
my_write()
6. @ 2021-22 Embitude Trainings <info@embitude.in>
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AM335X Registers
●
Module Control Register
– For configuring the SPI interface
– Single / Multi-channel, Master / Slave, Chip select pins
●
Channel Configuration Register
– Used to configure the SPI channel (0-3)
– Clock Divider, FIFO for Rx / TX, Pins for TX / RX, DMA RX/TX,
SPI Mode (Full Duplex, Half Duplex), Word Length, SPI
Mode
●
Channel Status Register
– Status information for channel (0–3)
– RX / TX FIFO Full / Empty
●
Channel Control Register
– Enabling / Disabling the channel
7. @ 2021-22 Embitude Trainings <info@embitude.in>
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AM335x SPI APIs
●
omap2_mcspi_set_enable(struct omap2_mcspi *, int
enable)
– Enable / Disable the channel
●
int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned
long bit)
– Wait for register bit to set
●
__raw_writel(ch, tx_reg)
– For writing into tx_reg
●
char ch = __raw_readl(rx_reg)
– For reading rx_reg
8. @ 2021-22 Embitude Trainings <info@embitude.in>
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Linux SPI Framework
●
spi.c – Implements the SPI core layer
●
include/linux/spi/spi.h
●
spidev.c – Provides the char interface for spi devices
●
include/linux/spi/spidev.h
●
spi-omap2-mcspi – Controller driver for omap based chips
9. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Core
drivers/spi/spi.c
Linux SPI Framework ...
SPI Client Drivers
mcp320x.c
drivers/iio/adc
SPI based ADC
driver
m25p80.c
drivers/mtd/
SPI based Flash
driver
rtc-ds1505.c
drivers/rtc
SPI based RTC
driver
spidev.c
drivers/spi
Char driver for
SPI
spi-omap2-
mcspi.c
omap SPI Master
Driver
atmel-spi.c
Atmel SPI Master
Driver
spi-imx.c
IMX SPI Master
Driver
spi-altera.c
Altera SPI Adapter
Driver
Industrial IO
Framework
MTD
Framework
RTC
Framework
Character Driver
Framework
10. @ 2021-22 Embitude Trainings <info@embitude.in>
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Framework Components
●
SPI Master
– Bus controller which handles the low level h/w transactions
– struct spi_master
●
dev – device interface to this driver
●
list – linked with global spi_master list
●
Board specific bus number
●
min_speed_hz
●
max_speed_hz
●
setup – updates the device mode and clock
●
transfer – adds a message to the controller’s transfer queue
●
cleanup – frees up controller specific state
●
transfer_one_message – the subsystem calls the driver
●
spi_register_master(spi_master)
11. @ 2021-22 Embitude Trainings <info@embitude.in>
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Framework Components ...
●
SPI Device
– Represents the SPI Slave in the Kernel
●
struct spi_device
– dev – device interface to this driver
– master – SPI controller used with the device
– max_speed_hz – Maximum clock rate to be used with this device
– mode – Defines how the data is clocked out and in
– bits_per_word
– controller_state – Controller’s runtime state
– controller_data – Board specific definitions for controller such as
FIFO
– modalias – name of the driver to use with this device
– cs_gpio – gpio signal used for chip select line
12. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Client Driver
●
Host side protocol driver
●
struct spi_driver
– probe – Binds the driver to SPI device
– remove – unbinds the driver from the SPI device
– id_table – List of SPI devices supported by this driver
– driver – name of this driver. This will be used to bind
with SPI slaves
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SPI Transfer
●
struct spi_device *spi
●
struct spi_transfer xfer;
●
struct spi_message sm;
●
u8 *cmd_buf;
●
int len;
●
Prepare the cmd_buf & its len
– spi_message_init(&sm);
– xfer.tx_buf = cmd_buf;
– xfer.len = len;
●
spi_message_add_tail(&xfer, &sm);
●
spi_sync(spi, &sm) & spi_async(spi, &sm)
●
spi_transfer_del(&xfer);
15. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Master Registration Flow
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spi_sync flow
17. @ 2021-22 Embitude Trainings <info@embitude.in>
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DTB changes for MCP3008
●
mcp3x0x@0 {
compatible = "mcp3208";
reg = <0>;
spi-max-frequency = <1000000>;
};
18. @ 2021-22 Embitude Trainings <info@embitude.in>
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SPI Driver Example
●
Driver: ADC (drivers/iio/adc/mcp320x.c)
●
Path: <kernel_source>/drivers/spi
●
Browse & Discuss
19. @ 2021-22 Embitude Trainings <info@embitude.in>
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What all have we learnt?
●
SPI Overview
●
SPI Character Driver Framework
●
Accessing Hardware Registers
●
Linux SPI Framework
●
SPI Framework Components
●
SPI Client Driver
20. @ 2021-22 Embitude Trainings <info@embitude.in>
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Any Queries?
