ATOMDisplay_DisplayModule_M5Stack_UG_2023_Tokyo.pdf

M5Stack Japan Spring Tour 2023 TokyoのLTでの発表内容です。
ATOM Display/Display Moduleの紹介をしています。

Transcript

1. ATOM Display / 

   Display Module 解説

   2023-05-04
   M5Stack Japan Tour 2023 Spring Tokyo
   

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2. 自己紹介

   ● 井田　健太 (Kenta IDA)
   ● My current job: Writing ESP32 firmware of smart home products
   ○ My previous job: Designing logic for Xilinx FPGAs.
   ● My hobby: Writing ESP32 firmware in Rust, etc…
   ● twitter: @ciniml
   

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3. ATOM Display Lite / Display Module

   ● Extension module to output HDMI video signal from M5Stack cores.
   ○ ATOM Display Lite: from M5ATOM series (ATOM Lite, Matrix, S3, S3 Lite)
   ○ Display Module: Core, Core2, (maybe CoreS3)
   ● You can show screen outputs from your software to larger display easily.
   ● You can also output sounds from the display (Display Module only)
   https://www.switch-science.com/products/8779
   https://www.switch-science.com/products/7592
   ATOM Lite, Matrix, S3, S3 Lite
   Core, Core2, (CoreS3?)
   HDMI Cable
   

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4. Structure of ATOM Display / Display Module system

   ● M5Unified/M5GFX sends display command and audio data.
   ● FPGA processes the display command and update the output.
   ● FPGA outputs video signal to the HDMI transmitter.
   ○ Audio data is passed through to the HDMI transmitter.
   ● HDMI transmitter outputs HDMI signal to the display.
   M5Stack MCU module
   (ATOM series, Core series)
   M5Unified
   M5GFX
   ATOM Display /
   Display Module
   User
   Software
   FPGA HDMI
   Transmitter
   Display Command
   Audio (Display Module only)
   

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5. Why am I giving this presentation today?

   ● Because all main developers of these modules are present here.
   ○ M5Unified/M5GFX -> らびやんさん
   ○ UI Flow support -> BoBoさん
   ○ ATOM Display / Display Module hardware -> HanXiaoさん
   ○ ATOM Display / Display Module FPGA -> me
   M5Stack MCU module
   (ATOM series, Core series)
   M5Unified
   M5GFX
   ATOM Display /
   Display Module
   User
   Software FPGA HDMI
   Transmitter
   @lovyan03 @ciniml
   @HanxiaoM
   UI Flow
   @its_hard_2_name
   

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6. Main feature of display modules

   ● Output resolution: 1920x1080@24Hz max.
   ○ Some displays does not support this video parameters.
   ● Note that this does not mean
   you can update the display content at this refresh rate.
   ○ Fill rate in the FPGA is limited due to its memory throughput.
   M5Stack MCU module
   (ATOM series, Core series)
   M5Unified
   M5GFX
   User
   Software
   ATOM Display /
   Display Module
   FPGA HDMI
   Transmitter
   Display Command
   SPI (80MHz)
   

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7. How to improve actual fill rate? (1/2)

   ● Use magnification function of display modules.
   ○ e.g. 4x magnification: draw 320x180 image -> shown as 1280x720
   ○ No extra cost for MCU module CPU.
   ■ Display module automatically magnificates the image and output to the display.
   320
   180
   1280
   720
   

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8. How to improve actual fill rate? (2/2)

   ● Use lower resolution and magnification.
   ○ e.g. draw 320x240 image -> shown as 640x480 image.
   ○ No extra cost for MCU module CPU.
   ● Display module supports various resolutions.
   ○ M5GFX automatically calculates appropriate video parameters.
   320
   240
   640
   480
   

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9. Audio output (Display Module only)

   ● Output audio from the display
   ● Audio data is output from MCU module as I2S stream.
   ● FPGA just passthrough the I2S signal.
   M5Stack MCU module
   (ATOM series, Core series)
   M5Unified
   M5GFX
   ATOM Display /
   Display Module
   User
   Software
   FPGA HDMI
   Transmitter
   Audio via I2S passthrough
   

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10. Customization of display modules

    ● You can change the FPGA logic by yourself!
    ● Source code of the FPGA logic is available.
    ○ https://github.com/ciniml/atom_display_fpga
    ○ Written mainly in Chisel.
    ● Development environment is available at no extra cost.
    ○ You can download the EDA tool from GOWIN website.
    ○ You need to submit an application to obtain a license.
    

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11. Example: Display latency checker

    ● Measures latency of displays.
    ○ Output blinking video signal from ATOM Display.
    ○ Measure actual display output by photo diode.
    ○ Use customized version of the FPGA design.
    

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12. Conclusion

    ● You can show images from your application to larger display
    by using ATOM Display / Display Module.
    ● You can control these modules easily by using M5GFX / UIFlow.
    ● Display Module also supports audio output.
    ● Customization of display modules FPGA is possible.
    ○ If you want to do it, I’ll give you a jig to support it.
    

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13. 宣伝

    ● Interface 2022年12月号別冊付録
    ● display moduleで使ったFPGAと
    同じシリーズのFPGAの解説記事
    書きました。
    https://interface.cqpub.co.jp/m
    agazine/20221201/
    

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