Silicon Laboratories SiM3U1xx Manual do Utilizador descarregar pdf (Página 15)

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5.3.6. EVENT_USB_Device_ConfigurationChanged

Event handler for the library USB Configuration changed event.

Syntax

void EVENT_USB_Device_ConfigurationChanged(void)

Parameters

None

Return Value

None

Description

This function configures endpoint according USB CDC class interface configuration structure.

Example

EVENT_USB_Device_ConfigurationChanged();

5.3.7. CALLBACK_USB_GetDescriptor

Send back descriptor per Get Descriptor request.

Syntax

uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,

const uint8_t wIndex,

const void** const DescriptorAddress)

Parameters

None

Return Value

Descriptor size

Description

When the device receives a Get Descriptor request on the control endpoint, this function is called so that the

descriptor details can be passed back and the appropriate descriptor sent back to the USB host.

Example

const void* DescriptorPointer;

uint16_t DescriptorSize;

if ((DescriptorSize = CALLBACK_USB_GetDescriptor(USB_ControlRequest.wValue,

USB_ControlRequest.wIndex,&DescriptorPointer )) == NO_DESCRIPTOR)

{

return;

}

Endpoint_ClearSETUP();

Endpoint_Write_Control_Stream_LE(DescriptorPointer, DescriptorSize);

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Silicon Laboratories SiM3U1xx Manual do Utilizador Página 15