1. Overview

The following is a high-level overview of the problem being resolved by this project:

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1. Overview

This document provides information on how to use ADC in the uClinux i.MX RT10XX BSPs.

2. Requirements

2.1. Detailed Requirements

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1. Provide a Linux demo project combining all the requirements in this project.

   • Rationale: Needed to let Customer integrate results of this project into target embedded application.
     Implementation: Section: "Design: Demo project".
     Test: Section: "Test Plan: Demo Project".

2. Develop Linux ADC device driver for the i.MX RT1050 ADC controller.

   • Rationale: Explicit Customer requirement.
     Implementation: Section: "Design: Linux ADC Device Driver".
     Test: Section: "Test Plan: Linux ADC Driver".

2.2. Detailed Non-Requirements

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3. Design

3.1. Detailed Design

3.1.1.

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Design-Demo-project Design-Demo-project

Design: Demo project

This project will enable the required ADC functionality in the Linux configuration ("embedded project") called rootfs, which resides in a projects/rootfs directory, relative to the top of the Linux i.MX RT10XX installation.

3.1.2.

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Design-Linux-ADC-Device-Driver Design-Linux-ADC-Device-Driver

Design: Linux ADC Device Driver

The clock driver for IMXRT10XX SoC will be updated to support the ADC clock gates.

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• Login: CONTACT EMCRAFT

• Password: CONTACT EMCRAFT

4.2.

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Downloadable-Files Downloadable-Files

Downloadable Files

The following files are available from the secure download area:

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1. Download the files listed in Section: "Downloadable Files" to the top of the Linux i.MX RT installation.

2. Install the BSP, as per the respective "Installing and activating cross development environment" document in the "Software" section on the Emcraft site.

3. From the top of the Linux installation, activate the Linux cross-compile environment by running:

   Code Block
   $ . ACTIVATE.sh

4. From the top of the BSP installation, go to the Linux kernel tree and install the kernel patch, eg:

   Code Block
   $ cd linux/ $ patch -p1 < ../../linux-adc.patch

5. From the top of the Linux installation, go to the projects sub-directory, and patch the rootfs project:

   Code Block
   $ cd projects/ $ patch -p1 < ../../projects-adc.patch

6. Build the rootfs project:

   Code Block
   $ cd projects/rootfs $ make

4.4. Detailed Test Plan

4.4.1.

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TestPlan-Demo-Project TestPlan-Demo-Project

Test Plan: Demo Project

Perform the following step-wise test procedure:

1. Go to the projects/rootfs directory, build the loadable Linux image (rootfs.uImage) and copy it to the TFTP directory on the host:

   Code Block
   $ cd projects/rootfs $ make

2. Boot the loadable Linux image (rootfs.uImage) to the target via TFTP and validate that it boots to the Linux shell:

   Code Block

   => run netboot Using ethernet@402D8000 device TFTP from server 192.168.1.73; our IP address is 192.168.1.105 Filename 'rootfs.uImage'. Load address: 0x80007fc0 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ... / # uname Linux / #

4.4.2.

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TestPlan-Linux-ADC-Driver TestPlan-Linux-ADC-Driver

Test Plan: Linux ADC Driver

Perform the following step-wise test procedure:

1. Connect 3.3V to channel 9 of ADC1 (for this, one can wire J25.4 to J23.3)

2. Check that the measurement on channel 9 of ADC1 is near maximum (4096):

   Code Block
   cat /sys/bus/iio/devices/iio:device0/in_voltage9_raw 4094

3. Connect GND to channel 9 of ADC1 (for this, one can wire J25.6 to J23.3)

4. Check that the measurement on channel 9 of ADC1 is near minimum (0):

   Code Block
   / # cat /sys/bus/iio/devices/iio:device0/in_voltage9_raw 2

5. Connect a wire with known voltage applied to channel 9 of ADC1.

6. Check that the measurement on channel 9 of ADC1 corresponds to the applied voltage measured with a voltage meter:

   Code Block
   / # cat /sys/bus/iio/devices/iio:device0/in_voltage9_raw 3278 / # cat /sys/bus/iio/devices/iio:device0/in_voltage_scale 0.805664062 / #

   (3278 corresponds to 3278 * 0.805664062 = 2.6V )

7. Repeat the tests with channels 0 of ADC1 (J23.2), 10 (J23.4) and 15 (J23.1)

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