Microchip ATMXT448UD Manual

Microchip Ikke kategoriseret ATMXT448UD

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 2019 Microchip Technology Inc. DS00003084A-page 1

TABLE OF CONTENTS

1.0 Introduction ................................................................................................................................................................. 1

1.1 SAMA5D3 Xplained Board ............................................................................................................................... 2

1.2 SAM Boot Assistance (SAM-BA) ...................................................................................................................... 2

1.3 Putty Terminal Program .................................................................................................................................... 3

1.4 Github Repository – maXTouch_linux .............................................................................................................. 4

2.0 Building the source and setting up the tools ................................................................................................................ 5

2.1 Device Tree Files .............................................................................................................................................. 5

2.1.1 at91-sama5d3_xplained_dm_pda4.dtsi ................................................................................................ 5

2.1.2 at91-sama5d3_xplained_pda4.dts ....................................................................................................... 5

2.2 Configuring the Kernel Options ......................................................................................................................... 5

2.3 Loading the Touch Driver as a Module ............................................................................................................. 6

2.4 Building the Kernel ............................................................................................................................................ 6

2.5 Modifying the U-boot-env.txt File ...................................................................................................................... 7

2.6 Programming the SAMA5D3 Xplained Board ................................................................................................... 8

3.0 maXTouch Linux Driver ............................................................................................................................................... 9

3.1 I2C Driver – atmel_mxt_ts.c .............................................................................................................................. 9

3.2 Object-based Protocol ...................................................................................................................................... 9

3.3 Power Up and Reset ......................................................................................................................................... 9

3.4 Downloading the Configuration ......................................................................................................................... 9

3.4.1 triggering configuration download with sysfs ...................................................................................... 10

3.4.2 Automatically downloading the configuration on driver probe ............................................................ 10

3.5 Firmware Upgrade .......................................................................................................................................... 10

4.0 Debugging the Driver ................................................................................................................................................ 12

4.1 Enabling Driver Debug Messages – dev_dbg ................................................................................................ 12

4.2 Viewing Touch Events – evtest ....................................................................................................................... 12

4.3 Viewing Touch Events – Android getevent ..................................................................................................... 13

4.4 Debug File System Interface – sysfs .............................................................................................................. 14

4.4.1 mem_access ...................................................................................................................................... 15

4.4.2 debug_enable ..................................................................................................................................... 15

4.5 Improved Debug Interface .............................................................................................................................. 15

4.6 The mxt-app Utility .......................................................................................................................................... 15

Appendix A. Revision History .............................................................................................................................................. 18

1.0 INTRODUCTION

This application note introduces the maXTouch Linux driver, its features and available debug options to help developers

with driver integration. It also provides details on how to configure and build the kernel on a test platform.

The maXTouch Linux driver is designed to support the Linux input subsystem. This driver resides in the drivers/input/

touchscreen directory of the kernel and interfaces with the hardware to generate 2D touch events to the Linux input

subsystem.

The Linux driver can be compiled as an in-built driver or as a module to be loaded after the initial kernel boot. The

application note provides details regarding function of the driver and the debug options that are available through the

touch driver along with information regarding the testing of the touch driver.

This application note assumes that the user has a Linux based PC (either actual or a virtual machine) and has basic

knowledge of the Linux OS. It also assumes basic use of Github. All testing has been done using the Ubuntu OS version

16.04. Any critical libraries or tools that need to be installed will be mentioned in this application note.

The details within this document will mainly reference the standard Linux kernel. Where possible, differences between

the Linux “distributions” (for example, Ubuntu, Android) in terms of tools, directory locations or behavior will be noted.

AN3084

Using the maXTouch Linux Driver

AN3084

DS00003084A-page 2  2019 Microchip Technology Inc.

1.1 SAMA5D3 Xplained Board

The platform used for testing and integration is the SAMA5D3 Xplained board. This SOC is a Cortex A5 ARM MPU. The

pre-built demonstration Yocto project provides a basis for touch driver testing and integration.

In this application note, the demo project linux4sam-poky-sam5d3_xplained_pda-5. 7 will be used. This can be found

at the following link:

ftp://www. at91.com/pub/demo/linux4sam_5.7/linux4sam-poky-sama5d3_xplained_pda4-5.7.zip

This project should be extracted to a local directory on the user’s PC. The content will be updated and used on the

SAMA5D3 Xplained board to develop and test the touch driver. Note that only the compressed kernel image (zImage)

and device tree binaries (.dtb) will be updated for testing; the u-boot, at91bootstrap and the Yocto project layer files

will not be modified.

The following link contains additional information regarding the demo projects for the SAMA5D3 Xplained board and

other supporting tools for the board:

https://www.at91.com/linux4sam/bin/view/Linux4SAM/Sama5d3XplainedMainPage

FIGURE 1: SAMA5D3 XPLAINED BOARD

1.2 SAM Boot Assistance (SAM-BA)

The SAM Boot Assistance (SAM-BA) in-system programmer is Microchip’s software for programming Microchip ARM

Thumb-based MPUs. It is run on the Linux OS platform on the user’s PC to re-program the MPU on the SAMA5D3

Xplained board.

Follow the link below to download and extract the SAM-BA program to a directory.

https://github.com/atmelcorp/sam-ba/releases

NOTE At time of writing, the latest version of the demo project is version 6.0. However, a hardware or u-boot

change is required to enable video to work. See the following locations for more details:

https://www.at91.com/linux4sam/bin/view/Linux4SAM/U-Boot#PDA_detection_at_boot

https://www.at91.com/linux4sam/bin/view/Linux4SAM/SelectingPDAatBoot

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	ATMXT448UD

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