Silicon Laboratories SiM3U1xx Manual do Utilizador descarregar pdf (Página 13)

AN758

Rev. 0.1 13

5.3. Application Layer

The application layer for the USB CDC firmware example can be found in the VirtualSerial.c and Descriptors.c

files in the AN758_USB_CDC\src\VirtualSerial directory.

5.3.1. vcp_main

Virtual COM port entry function.

Syntax

void vcp_main(void)

Parameters

None

Return Value

None

Description

This function initialize USB stack and execute Echo mode or Bridge mode in endless while loop.

Example

enter_default_mode_from_reset();

vcp_main();

5.3.2. VCOM_echo

It echo input character to USB virtual COM

Syntax

void VCOM_echo(void)

Parameters

None

Return Value

None

Description

This function get byte from USB virtual COM port and send back to virtual COM. User will see echo character in

their serial com tool.

Example

VCOM_echo();

5.3.3. VCOM_bridge

It transfer data between USB virtual COM port and UART hardware COM port.

Syntax

void VCOM_bridge(void)

Parameters

None

Return Value

None

Description

This function acts as USB to UART bridge function.

Example

VCOM_bridge();

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