Kontron KTT20-pITX Bedienungsanleitung PDF herunterladen (Seite 53)

KTD-S0045-D Page 49 Windows® Embedded Compact 7 (WEC7) BSP

KTT20/pITX Software Guide

11.7 GPIO Examples

Defines PORT_C as output and sets each pin to low level (alternative to high level):

#include <windows.h>

#include <winioctl.h>

#include <tchar.h>

// define IO controls

#define IOCTL_GPIO_CLEAR_OUTPUT \

CTL_CODE (FILE_DEVICE_USERDRIVER, 3300, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_GPIO_SET_OUTPUT \

CTL_CODE (FILE_DEVICE_USERDRIVER, 3301, METHOD_BUFFERED, FILE_ANY_ACCESS)

#define IOCTL_GPIO_CONFIG_OUTPUT \

CTL_CODE (FILE_DEVICE_USERDRIVER, 3303, METHOD_BUFFERED, FILE_ANY_ACCESS)

// define ports

#define GPIO_PORT_A 0

#define GPIO_PORT_B 1

#define GPIO_PORT_C 2

#define GPIO_PORT_D 3

#define GPIO_PORT_E 4

#define GPIO_PORT_F 5

// index conversion macros

#define GET_INDEX(port, pin) ((port << 3) | (0x07 & pin))

int _tmain (int argc, TCHAR *argv[])

{

HANDLE hDev;

UINT i;

UCHAR ucBuffIn, ucBuffOut;

// Create handle

hDev = CreateFile (L"PIO1:", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

if (hDev != INVALID_HANDLE_VALUE)

{

for (i = 0; i < 8; i++)

{

ucBuffIn = GET_INDEX (GPIO_PORT_C, i);

if (! DeviceIoControl (hDev, IOCTL_GPIO_CONFIG_OUTPUT,

&ucBuffIn, sizeof (UCHAR), &ucBuffOut, sizeof (UCHAR),

NULL, NULL))

wprintf (TEXT ("Error: DeviceIoControl_CONFIG_OUTPUT failed\r\n"));

// use IOCTL_GPIO_CLEAR_OUTPUT or IOCTL_GPIO_SET_OUTPUT

if (! DeviceIoControl (hDev, IOCTL_GPIO_CLEAR_OUTPUT,

&ucBuffIn, sizeof (UCHAR), &ucBuffOut, sizeof (UCHAR),

NULL, NULL))

wprintf (TEXT ("Error: DeviceIoControl_CLEAR_SET_OUTPUT failed\r\n"));

}

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