User manual

Page | 108

IOCTL Code

Descriptions

IOCTL_GPIO_SETBIT

The GPIO pin will be set as 1

IOCTL_GPIO_CLRBIT

The GPIO pin will be cleared

IOCTL_GPIO_GETBIT

Read the GPIO pin status

IOCTL_GPIO_SETMODE

Set the working mode of the GPIO pin

IOCTL_GPIO_GETMODE

Read the working mode of the GPIO pin

IOCTL_GPIO_GETIRQ

Read the corresponding IRQ number of the

GPIO pin

The tables below contain examples of GPIO applications;

1. Enable the GPIO device;

HANDLE hFile = CreateFile(_T("GIO1:"),

(GENERIC_READ|GENERIC_WRITE),

(FILE_SHARE_READ|FILE_SHARE_WRITE), 0, OPEN_EXISTING, 0, 0);

2. Set the working mode as reading GPIO;

DWORD id = 0, mode = 0;

3. Set the working mode of the GPIO;

DWORD pInBuffer[2];

pInBuffer[0] = id;

pInBuffer[1] = mode;

DeviceIoControl(hFile, IOCTL_GPIO_SETMODE, pInBuffer,

sizeof(pInBuffer), NULL, 0, NULL, NULL);

4. Read the working mode of the GPIO;

DeviceIoControl(hFile, IOCTL_GPIO_GETMODE, &id,

sizeof(DWORD), &mode, sizeof(DWORD), NULL, NULL);