User Manual
Table Of Contents
- Revision History
- Table of Contents
- Target products
- 1 INTRODUCTION
- 2 OVERVIEW OF SIMPLE AV SYSTEM BOARD
- 3 PREPARATIONS
- 4 PROGRAM EXECUTION METHOD
- 5 SUPPORTED MEDIA
- 6 OPERATION METHOD
- 7 SPECIFICATIONS
- 7.1 Hardware
- 7.2 Software
- 7.2.1 Software Block Diagram
- 7.2.2 Software Library
- 7.2.3 System Specifications
- 7.2.4 API Specifications
- 7.2.5 Operation Limit
- 7.2.6 Operation Flow of Entire Application
- 7.2.7 Application State Transition
- 7.2.8 Operation Flow
- 7.2.8.1 Main Processing Function
- 7.2.8.2 USB Task Processing Function
- 7.2.8.3 File System (MDF) Task Processing Function
- 7.2.8.4 HMI Task Processing Function
- 7.2.8.5 AUDIO Play Task Processing Function
- 7.2.8.6 Switch Press Detection Processing Function
- 7.2.8.7 Processing Function After Switch Press Detection
- 7.2.8.8 Touch Panel Touch Detection Processing Function
- 7.2.8.9 Processing After Touch Panel Touch Detection Function
- 7.2.9 File Configuration
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7.2.6 Operation Flow of Entire Application
7.2.6.1 MP3
(1) The application operation flow with audio data playback stopped is as follows.
① USB MSC device connection/disconnection judgment is executed in the main
loop.
② If a USB memory is connected, after reading the JPEG files from the USB
memory and displaying the images for selection, switch pressing detection and
touch panel detection are conducted.
③ If the play/stop switch is detected to be pressed down, or if not detected, but an
area of the touch panel is detected to have been touched, the JPEG files
corresponding to the selected MP3 file are read from the USB memory and
displayed for playback. If the selection previous switch or selection next switch
are detected to have been pressed down, MP3 file selection is shifted and LED
control is executed.
④ The MP3 selected from the USB memory is then opened.
⑤ The MP3 file header is read, MP3 file header analysis processing is conducted
and operation shifts to audio data playback in progress status.
This operation is shown in Figure 48.