Motorola MC9190 User Manual (English)

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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.

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Motorola MC9190 Specifications

General

RAM	256 MB
Flash Memory	1 GB
Scanner	1D laser scanner or 2D imager
Sealing	IP64
Operating Temperature	-4° F to 122° F/-20° C to 50° C
Processor	Marvell PXA320 @ 806 MHz
Display	3.7 inch VGA color display
Connectivity	802.11a/b/g, Bluetooth
Battery	2200 mAh Lithium-ion
Drop Spec	6 ft./1.8 m drop to concrete across operating temperature range
Weight	with battery
Keypad	28-key numeric, 43-key alphanumeric, 53-key alphanumeric