Embest AM3517 Specifications download pdf (Page 77)

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pInBuffer[0] = id;

pInBuffer[1] = mode;

DeviceIoControl(hFile, IOCTL_GPIO_SETMODE, pInBuffer, sizeof(pInBuffer),

NULL, 0, NULL, NULL);

Read the working mode of the GPIO:

DeviceIoControl(hFile, IOCTL_GPIO_GETMODE, &id, sizeof(DWORD), &mode,

sizeof(DWORD), NULL, NULL);

"id" is the GPIO Pin number, "mode" is GPIO mode, including:

Mode definition

Description

GPIO_DIR_OUTPUT

Output mode

GPIO_DIR_INPUT

Input mode

GPIO_INT_LOW_HIGH

Rising edge trigger mode

GPIO_INT_HIGH_LOW

Falling edge trigger mode

GPIO_INT_LOW

low level trigger mode

GPIO_INT_HIGH

high level trigger mode

GPIO_DEBOUNCE_ENABLE

Jumping trigger enable

3. The operation of GPIO Pin

DWORD id = 0, pin = 0;

Output high level:

DeviceIoControl(hFile, IOCTL_GPIO_SETBIT, &id, sizeof(DWORD), NULL, 0, NULL,

NULL);

Output low level:

DeviceIoControl(hFile, IOCTL_GPIO_CLRBIT, &id, sizeof(DWORD), NULL, 0, NULL,

NULL);

Read the pin state

DeviceIoControl(hFile, IOCTL_GPIO_GETBIT, &id, sizeof(DWORD), &pin,

sizeof(DWORD), NULL, NULL);

Where "id" is GPIO pin number, "pin" returns to pin state

4. Other optional operations

Read the corresponding IRQ number of GPIO pin

DWORD id = 0, irq = 0;

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Embest AM3517 Specifications Page 77