CP2114 datasheet(18/54 Pages) SILABS

18 / 54 page

AN433

Rev. 0.5

2.25. HidUart_ReadLatch

Description:

Gets the current port latch value from the device.

Prototype:

HID_UART_STATUS

HidUart_ReadLatch

(HID_UART_DEVICE

device,

WORD*

latchValue)

Parameters:1.

device—Device object pointer as returned by HidUart_Open().

latchValue—Returns the port latch value (Logic High = 1, Logic Low = 0). If a pin is configured

as a GPIO input or flow control pin that is an input, then the corresponding bit represents the

input value. If a pin is configured as a GPIO output pin or a flow control pin that is an output,

then the corresponding bit represents the logic level driven on the pin.

Return Value: HID_UART_STATUS

HID_UART_SUCCESS

HID_UART_INVALID_DEVICE_OBJECT

HID_UART_INVALID_PARAMETER

HID_UART_DEVICE_IO_FAILED

HID_UART_DEVICE_NOT_SUPPORTED

Remarks:

See "6. Port Latch Pin Definition" on page 46 for more information on configuring GPIO and flow

control pins. Bits 9 and 15 of latchValue are ignored.

2.26. HidUart_WriteLatch

Description:

Sets the current port latch value to the device.

Prototype:

HID_UART_STATUS

HidUart_WriteLatch

(HID_UART_DEVICE

device,

WORD

latchValue, WORD latchMask)

Parameters:1.

device—Device object pointer as returned by HidUart_Open().

latchValue—Value to write to the port latch (Logic High = 1, Logic Low = 0). This function is

used to set the values for GPIO pins or flow control pins that are configured as outputs. This

function will not affect any pins that are not configured as outputs.

latchMask—Determines which pins to change (Change = 1, Leave = 0).

Return Value: HID_UART_STATUS

HID_UART_SUCCESS

HID_UART_INVALID_DEVICE_OBJECT

HID_UART_DEVICE_IO_FAILED

HID_UART_DEVICE_NOT_SUPPORTED

Remarks:

See "6. Port Latch Pin Definition" on page 46 for more information on configuring GPIO and flow

control pins. Bits 9 and 15 or latchValue and latchMask are ignored. Pins TX, RX, Suspend, and /

Suspend cannot be written to using this function.

CP2114 Datasheet(PDF) 18 Page - Silicon Laboratories

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