Silicon Laboratories SiM3U1xx Manual do Utilizador descarregar pdf (Página 9)

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5.1.4. CDC_Device_SendByte

USB CDC sends one byte to USB IN FIFO.

Syntax

uint8_t CDC_Device_SendByte(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo,

const uint8_t Data)

Parameters

CDCInterfaceInfo: Pointer to CDC Class state structure

Data: byte data to send

Return Value

Error code: definition can be found in EndpointStream.h

ENDPOINT_RWSTREAM_NoError

ENDPOINT_RWSTREAM_EndpointStalled

ENDPOINT_RWSTREAM_DeviceDisconnected

ENDPOINT_RWSTREAM_BusSuspended

ENDPOINT_RWSTREAM_Timeout

ENDPOINT_RWSTREAM_IncompleteTransfer

Description

This function sends one byte to USB IN FIFO.

Note: Endpoint_ClearIN()must be called to send data to USB host, otherwise, the data will keep in USB device FIFO.

Example

CDC_Device_SendByte(&VirtualSerial_CDC_Interface,0x55);

Endpoint_ClearIN();

5.1.5. CDC_Device_BytesReceived

USB CDC number of bytes received.

Syntax

uint16_t CDC_Device_BytesReceived(USB_ClassInfo_CDC_Device_t* const

CDCInterfaceInfo)

Parameters

CDCInterfaceInfo: Pointer to CDC Class state structure

Return Value

Bytes received in USB endpoint.

Description

This function check how many bytes received in USB data out endpoint

Example

uint32_t recv_count;

recv_count = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);

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Silicon Laboratories SiM3U1xx Manual do Utilizador Página 9