Vlsi VS1000 Manuale tecnico

VLSI

Solution

Controlled Document

VS1000B/C Audio Book

VS1000 “VLSI Solution Ogg Vorbis Player”

Project Code:

Project Name: VS1000

Revision History

Rev. Date Author Description

0.92 2008-10-31 PO Public domain content, works with Developer

Board.

0.9 2008-02-05 PO Menu ﬁle format changed.

0.8 2008-01-23 PO Programming instructions update, low-voltage

poweroﬀ disabled.

0.7 2008-01-07 PO Better menu generator, a few additions.

0.6 2007-12-20 PO First beta version.

0.5 2007-11-26 PO Initial version.

Rev. 0.92 2008-10-31 Page 1(16)

VLSI

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VS1000B/C Audio Book VS1000

Table of Contents

1 VS1000 Audio Book 3

1.1 Introduction................................... 4

1.2 Keys....................................... 5

1.3 Battery Level Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 StartupScreen ................................. 7

1.5 MenuSystem .................................. 8

1.6 UserInterface.................................. 12

1.7 Flashing the Test Software through USB . . . . . . . . . . . . . . . . . . . 13

1.8 Flashing the Test Software Through UART . . . . . . . . . . . . . . . . . 14

1.9 ExampleFiles.................................. 15

2 Changes 16

Rev. 0.92 2008-10-31 Page 2(16)

VLSI

Solution

VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1VS1000 Audio Book

Figure 1.1: VS1000 Audio Book

•Graphical startup screen and main menu heading.

•A menu system described in MENU.MNU is used.

•A menu entry can point to a sample-exact position in an Ogg Vorbis ﬁle.

•Allows browsing menu during audio playback.

•Battery level measurement.

•Bookmarks and keylock.

•Backlight timer.

•Can also use a display with parallel interface.

Rev. 0.92 2008-10-31 Page 3(16)

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Solution

VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1.1 Introduction

This document shows the main features of the VS1000 Audio Book, and talks about how

some things are implemented. Free code space and the structure of code limits which

improvements are possible.

To make it easier to change ﬁles, the USB mass storage is enabled. The USB is only

detected at poweron, and only Mass Storage is supported. If a valid FAT ﬁlesystem or

the menu ﬁle is not found, the software waits for USB to be attached.

For code space reasons the software is in three separate programs. This is why the

software can not be loaded and run with the emulator.

•Init - performs initialization, reads settings and bookmarks, shows startup screen,

and detects USB.

•Book - implements the player and menu system.

•Power oﬀ - saves settings and bookmarks, turns the unit oﬀ.

Changes required to the VS1000 Developer Board:

•Extra button added to GPIO0[5] for bookmark / lock. The software can be tested

without the button.

•Battery level measurement using a comparator in GPIO0[6]. Without the extra

circuit battery is shown to be empty (JP14 open) or full (JP14 closed).

•Backlight LED connected between TX and IOVDD (with a resistor).

•A 1 nF capacitor added to reset line for better OLED display reset.

Rev. 0.92 2008-10-31 Page 4(16)

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1.2 Keys

The VS1000 Audio Book uses one extra key in addition to the normal keys. The extra

key is added to GPIO0[5] in the same way as the other other keys on GPIO0. The

following key arrangement is recommended for a product.

MODE

VOL+

NEXTPREV

MARK/LOCK

SELECT

POWER

PLAY/PAUSEVOL−

Figure 1.2: Suggested Key Arrangement

Rev. 0.92 2008-10-31 Page 5(16)

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1.3 Battery Level Measurement

VS1000 does not have a analog-to-digital converter that could be used for monitoring

battery voltage. However, in player mode the voltage of the AVDD regulator can be

changed quite freely without it aﬀecting the audio quality (20 steps from 12 to 31). By

using a simple comparator circuit the AVDD can act as a changable reference to ﬁnd out

what the battery voltage level is.

GPIO0_6

−

GND

100k

56k

100k

IOVDD

GND

AVDD

VBATT

VREF

Figure 1.3: Voltage Monitor

The resistor divider in AVDD determines the comparison range.

In the VS1000 Audio Book battery measurement is done at startup and once per sec-

ond. The battery voltage is compared to a reference voltage and the result is read using

GPIO0 6. The reference voltage is generated from AVDD using a resistor divider. Be-

cause AVDD can be changed by controlling the internal regulators, the battery voltage

can be measured with 20 steps.

Measurement is not done during low-power pause mode.

Low-power pause mode is entered when the audio is not playing and the backlight has

been turned oﬀ. The low-power pause mode has 5-minute power-oﬀ timeout.

IMPROVEMENT: The low-power pause mode should wake up peridiocally to check the

battery level.

Rev. 0.92 2008-10-31 Page 6(16)

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1.4 Startup Screen

The graphics for the startup screen is taken from the ﬁle SCREEN.SCR. The size should

be 8×132 bytes. If this ﬁle does not exist, the software goes to main menu directly.

If the ﬁle exists, the startup screen is shown for about 10 seconds, or until any key is

pressed. After that the main menu is shown.

Figure 1.4: Startup Screen

The unit does not turn on if you quickly touch the power button. There is a small time

limit of 0.25 seconds. If the press was too short, the unit will turn itself oﬀ again after

one second.

If the backlight is not conﬁgured to be always oﬀ, it is on during the display of the startup

screen.

Rev. 0.92 2008-10-31 Page 7(16)

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

1.5 Menu System

The whole audio book is built around a menu system. Only audio ﬁles that have been

added to the menu system are playable. One ﬁle MENU.MNU describes the menu tree.

The playable menu entries specify a ﬁle name, a starting position, and an end position.

The playback starts from the start position and continues until the end of the .ogg ﬁle.

After that the player returns to menu.

A menu entry can also specify that the end position is used to end the playback. In that

case the portion between the start and end positions are played and after that the player

returns to menu. This can be used to play only a speciﬁc fraction of a ﬁle, for example

one part of a larger story.

The verse entries are used to display the name of the current play position during play-

back.

Figure 1.5: Menu Structure

Each entry is 64 bytes long. This includes a 42-character menu entry name, sub-menu

indices, 8-character FAT ﬁlename, start and end times, and menu ﬂags.

Bookmark menu entries have a ﬁlename starting with “:”, but they have special processing

in the software: only bookmarks that exist are shown in the menu. You can also select

the bookmark to continue browsing from the bookmarked verse.

Backlight timer menu entries have a ﬁlename starting with “!”, and you can have diﬀerent

backlight timer values by just modifying the menu entries.

See also genmenu.c and menu.txt for examples and comments.

Rev. 0.92 2008-10-31 Page 8(16)

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

The main menu can have a graphical top line from MAINMENU.SCR, 2×132 bytes. The

battery symbol is drawn on top of the graphics. If the ﬁle is not found, the default

graphics “MAIN MENU” is used.

Figure 1.6: Main Menu

Selecting an entry with NEXT or MODE/MENU button will advance in the menu tree.

Pressing PLAY will start playing from the beginning of the current entry at any level, if

the menu entry has the autoplay option.

Figure 1.7: Book Selection

After book selection you can select a chapter. At the lowest level you can select individual

verses.

Figure 1.8: Chapter and Verse selection

Rev. 0.92 2008-10-31 Page 9(16)

VLSI

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VS1000B/C Audio Book VS1000

1. VS1000 AUDIO BOOK

You can set bookmarks in play mode and remove bookmarks in the bookmark menu.

The bookmarked verse name is shown in the bookmark menu. You can press play to

start playing, or you can press mode or next to start browsing from the bookmarked

entry.

You can not enter the bookmark menu if there are no bookmarks. If you remove all

bookmarks, you will be automatically returned to the main menu.

There is currently space for 28 bookmarks.

Figure 1.9: Main Menu

The current backlight timer setting is shown beside the backlight timer entry. ++ is

shown if the backlight is always on, 00s is shown if the backlight is always oﬀ. Select the

backlight menu to change the backlight timer setting.

Figure 1.10: Backlight Timer

Highlight the setting you want, then press mode, next, or play to select it. You will be

automatically returned to the main menu.

Bookmarks, the volume setting and backlight timer conﬁguration are saved to FLASH

when the unit is turned oﬀ using the power key.

Rev. 0.92 2008-10-31 Page 10(16)

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