Motorola MC9190 Manuale dell'operatore

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REVISIONS

REV

DESCRIPTION

DATE

APPROVED

1.0

Based on MC9090 Ext Power Control User Document

12/15/2011

Lasantha Jayathilake

Enterprise Solutions

MC9190 EXT POWER CONTROL

USER DOCUMENT

Page 1 OF 10

Page 2of 10

TABLE OF CONTENTS

1. INTRODUCTION............................................................................................................................3

1.1 Purpose......................................................................................................................................................3

2. MC9190 EXTERNAL POWER PIN ..............................................................................................4

2.1 Background ...............................................................................................................................................4

2.2 Theory of Operation ..................................................................................................................................4

3. DESIGN.............................................................................................................................................7

3.1 Software Design ........................................................................................................................................7

3.1.1 Sample code to enable external power...........................................................................................7

3.1.2 State at EXP Open and Close.........................................................................................................8

3.1.3 Boot up state...................................................................................................................................8

3.1.4 Suspend and Resume......................................................................................................................9

3.2 Test Application ........................................................................................................................................9

3.2.1 Open and Close buttons in the COM Block ...................................................................................9

3.2.2 Open and close buttons in the Power Block...................................................................................9

3.2.3 Enable and Disable buttons in the Power block ............................................................................9

3.2.4 Blank text box and the “X” button .................................................................................................9

4. NOTES ............................................................................................................................................10

TABLE OF FIGURES

Figure 1 –MC9190 bottom port .............................................................................................................4

Figure 2 - Block diagram..........................................................................................................................6

Figure 3 - Test Application ...................................................................................................................... 9

LIST OF TABLES

Table 1: MC9190 Bottom Port Pin-Outs .................................................................................................5

Page 3of 10

Introduction

1.1 Purpose

The purpose of this document is to describe the software design of MC919x External power pin

control. This is a part of a project designing and building a custom ADP9000 accessory that can

provide power to charge 3rd party USB accessories using MC919x battery.

Page 4of 10

2. MC9190 External Power Pin

2.1 Background

Motorola MC9190 hand held computer supports a series of accessories through its bottom electrical

connector. This connector has number of communication ports and a power line to provide power to

these external devices. Historically this power pin has been controlled by the communication port

driver used to communicate to the accessory.

MC919x External Power Control Driver provides an extra interface that can be used to control the

external power pin without affecting the communication port. This can be used with Custom

hardware accessory ADP9000-120R to charge 3rd party USB devices from MC919x battery.

2.2 Theory of Operation

Figure 1 –MC9190 bottom port

Page 5of 10

Signal Name

Function

USB_GND

USB

USB_D_PLUS

USB

TXD

RS232C

RXD

RS232C

DCD

RS232C

RTS

RS232C

DSR

RS232C

GND

Ground, 2.5A max

RS232C

CRADLE_DET

Grounded by cradle when in cradle

DTR

RS232C

Not

connected Not connected

POWER_IN

12V, 2.5A max

CTS

RS232C

USB_5V_DET

USB

USB_D_MINUS

USB

EXT_PWR_OUT

500mA max

Table 1: MC9190 Bottom Port Pin-Outs

Page 6of 10

Figure 2 - Block diagram

External power pin is controlled by an ASIC and it can be controlled by writing to a hardware

custom product we are looking at COM1 (serial printer port) only.

The solution is provided as a CAB installer and the user has to install it and do a manual warm boot.

A clean boot will erase the external power driver and restore the device to previous state.

Power

Driver

EXP1

Serial

Driver

COM1

CPLD or

ASIC

System

Registry

Contr

External Power

Pin#17

Page 7of 10

3. Design

3.1 Software Design

The new External power driver (EXP1) directly access the H/W and controls external power pin. The

existing Serial Driver also accesses this pin but its activity can be controlled via system registry.

Here we have blocked COM1 controlling external power pin using the below registry entry.

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial\DevPower]

"PwrControlType"=dword:00000000

Then we load External power driver as a built in driver using below registry entry so that user

application can open it using EXP1.

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\ExtPwrPin]

"FriendlyName"="External Power Pin Driver"

"Prefix"="EXP"

"Dll"="ExtPwrPin.dll"

"Index"=dword:00000001

"Order"=dword:00000005

"IClass"=MultiSZ: {A32942B7-920C-486b-B0E6-92A702A99B35}

We have below Device IO control exposed out for the application developer to use.

IOCTL_ENABLE_EXTPWRPIN

3.1.1 Sample code to enable external power

#include <winIoctl.h>

#define FILE_DEVICE_EXTERNALPOWERPIN_TOGGLER 0x00007000

#define IOCTL_ENABLE_EXTPWRPIN \

CTL_CODE(FILE_DEVICE_EXTERNALPOWERPIN_TOGGLER, 0x801, \

METHOD_BUFFERED, FILE_WRITE_ACCESS)

HANDLE g_hPwrPort=INVALID_HANDLE_VALUE;

BOOL bVal=TRUE; //Set True for Power ON

//open External power driver

g_hPwrPort = CreateFile (L"EXP1:", GENERIC_READ,FILE_SHARE_READ, \

0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);

//If we have a valid handle, call DeviceIoControl

if(INVALID_HANDLE_VALUE != g_hPwrPort)

DeviceIoControl(g_hPwrPort,IOCTL_ENABLE_EXTPWRPIN, \

(LPVOID)&bVal,sizeof(BOOL),NULL,NULL,NULL,NULL);

Above code sample can be used to open the EXP1 and to set power pin to ON.

Page 8of 10

3.1.2 State at EXP Open and Close

To provide user more control to the power pin, below registry entries can be used to define its

status at EXP1 Open and Close. This is useful in situations where the user expect to automatically

reset the power when the he exit from the application.

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\ExtPwrPin]

"OpenPowerState"=dword: 00000002

"ClosePowerState"=dword: 00000000

dword = 0 - OFF (Default for ClosePowerState)

dword = 1 - ON

dword > 2 - UNCHANGE (Default for OpenPowerState)

The default state is defined as: when the user opens EXP1, it will not change the power state but

when it is closed the power will go off. User can manipulate these entries such that the power goes

ON at EXP1 open and goes OFF and EXP1 close so that the device IO control can be bypassed.

IMPORTANT

These settings will be loaded only at a system startup so the user need to warm boot the device

after changing any of the above registry entries.

If ClosePowerState is set to 1, the device will set the External Power pin to ON after a warm boot.

This happens due to device manager calling the device IO control at system startup which involves

an EXP1 Open followed by an EXP1 Close. Similarly if OpenPowerState is set to 1, and

ClosePowerState is set to “Unchange”, the external power pin will stay on after a warm boot.

3.1.3 Boot up state

The state of the external power pin after Cold/Warm boot is controlled by the below registry entry.

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\ExtPwrPin]

"BootPowerState"=dword: 00000000

BootPowerState = 0 - External pin is OFF at warm boot (Default)

BootPowerState > 1 - External pin is ON at warm boot

Any value greater than 1 will be considered as 1, and if this entry is not there the default (0) will be

used.

IMPORTANT

These settings will be loaded only at a system startup so the user need to warm boot the device

after changing any of the above registry entries.

Page 9of 10

To use this feature, EXP1 OpenPowerState and ClosePowerState entries has to be set to UNCHANGE

(2). Device manager will call EXP open and Close at driver Init so it will be first set to

OpenPowerState and then to ClosePowerState regardless of what is defined as BootPowerState.

3.1.4 Suspend and Resume

At suspend, the external power pin will go off and at resume will be restored to the original state.

3.2 Test Application

Figure 3 - Test Application

Above application provides a basic test platform for the EXP1 power driver. It is copied to MC9190

devices \Program Files\ExtPowerTest folder when the driver CAB file is installed.

3.2.1 Open and Close buttons in the COM Block

These two buttons will open and close the built in COM port COM1. When the power driver is

installed it should not change the external power pin state.

3.2.2 Open and close buttons in the Power Block

There two buttons will open and close EXP1. With default settings this will not change the external

power pin state but “Close” button will switch external power off if it is set to ON by “Enable”

button.

3.2.3 Enable and Disable buttons in the Power block

These two buttons will call the device IO control to ON and OFF power to the external power pin.

3.2.4 Blank text box and the “X” button

The text box will display any error state, and the “X” button can be used to clear the text box.

Page 10 of 10

4. Notes

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