Difference between revisions of "MISC-TN-001: Triple video output on i.MX6 DualPlus-based Android platform"
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==Introduction== | ==Introduction== | ||
| − | As known, [https://en.wikipedia.org/wiki/Android_(operating_system) Android] popularity is growing even in the market segments different than | + | As known, [https://en.wikipedia.org/wiki/Android_(operating_system) Android] popularity is growing even in the market segments different than consumer/mobile. |
| − | The use of Android in such applications poses tough technical challenges because the hardware platforms are not designed to be strictly compliant with the [https://source.android.com/compatibility/android-cdd.pdf specifications] defined by Google. Consequently, significant modifications to the [https://source.android.com/ Android Open Source Project] | + | The use of Android in such applications poses tough technical challenges because the hardware platforms are not designed to be strictly compliant with the [https://source.android.com/compatibility/android-cdd.pdf specifications] defined by Google. Consequently, significant modifications to the [https://source.android.com/ Android Open Source Project] have to be implemented in order to achieve a smartphone-like user experience, even if the underlying platform may have very few things in common with such a device. |
| − | This technical note describes one these cases | + | This technical note describes one of these cases. Specifically, it refers to a turn-key product that DAVE Embedded Systems developed for a customer that manufactures biomedical devices. |
==Hardware platform overview== | ==Hardware platform overview== | ||
Revision as of 08:46, 16 July 2019
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History[edit | edit source]
| Version | Date | Notes |
|---|---|---|
| 1.0.0 | December 2017 | First release |
Introduction[edit | edit source]
As known, Android popularity is growing even in the market segments different than consumer/mobile.
The use of Android in such applications poses tough technical challenges because the hardware platforms are not designed to be strictly compliant with the specifications defined by Google. Consequently, significant modifications to the Android Open Source Project have to be implemented in order to achieve a smartphone-like user experience, even if the underlying platform may have very few things in common with such a device.
This technical note describes one of these cases. Specifically, it refers to a turn-key product that DAVE Embedded Systems developed for a customer that manufactures biomedical devices.
Hardware platform overview[edit | edit source]
A simplified block diagram of the hardware platform is depicted in the following image.
From the functional standpoint, the device is a sort of industrial tablet. The user interacts with a TBD" capacitive touchscreen.
Modifications to the Android Open Source Project were made in order to support main screen mirroring on the HDMI output and to support the WiFi chipset installed on board featuring the WiFi Direct protocol for screen mirroring over WiFi. Such modifications are made not only on the customized Android device layer but also on the system, hardware, external, and platform layers mainly to add support to the previously unsupported WiFi chipset. Once the WiFi chipset is being supported at the lowest level of the software stack, the Android framework enables WiFi functionality to the device.
Simultaneous triple video output[edit | edit source]
One of the advanced features of the device is the capability to drive three video outputs simultaneously, as per customer's requirements.
Specifically, the main screen can be mirrored on the HDMI output and through a WiFi Direct connection. As the main screen resolution is 1920x1280 @ 60fps, the aggregated memory bandwidth requirement is considerable. To satisfy it, the Dual Plus version of the well-known i.MX6 system-on-chip (SOC) from NXP was chosen as the. It provides, in fact, significant enhancements over its predecessors in terms of graphics performances.
TBD insert video
