EFM32 Happy Gecko Software Documentation
efm32hg-doc-5.1.2
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Implements USB Communication Device Class (CDC).
The source code of the CDC implementation resides in kits/common/drivers/cdc.c and cdc.h. This driver implements a basic USB to RS232 bridge.
This section contains a description of the configuration options for the driver. The options are #define's which are expected to be found in the application "usbconfig.h" header file. The values shown below are from the Giant Gecko DK3750 CDC example.
// USB interface numbers. Interfaces are numbered from zero to one less than // the number of concurrent interfaces supported by the configuration. A CDC // device is by itself a composite device and has two interfaces. // The interface numbers must be 0 and 1 for a standalone CDC device, for a // composite device which includes a CDC interface it must not be in conflict // with other device interfaces. #define CDC_CTRL_INTERFACE_NO ( 0 ) #define CDC_DATA_INTERFACE_NO ( 1 ) // Endpoint address for CDC data reception. #define CDC_EP_DATA_OUT ( 0x01 ) // Endpoint address for CDC data transmission. #define CDC_EP_DATA_IN ( 0x81 ) // Endpoint address for the notification endpoint (not used). #define CDC_EP_NOTIFY ( 0x82 ) // Timer id, see USBTIMER in the USB device stack documentation. // The CDC driver has a Rx timeout functionality which require a timer. #define CDC_TIMER_ID ( 0 ) // DMA related macros, select DMA channels and DMA request signals. #define CDC_UART_TX_DMA_CHANNEL ( 0 ) #define CDC_UART_RX_DMA_CHANNEL ( 1 ) #define CDC_TX_DMA_SIGNAL DMAREQ_UART1_TXBL #define CDC_RX_DMA_SIGNAL DMAREQ_UART1_RXDATAV // UART/USART selection macros. #define CDC_UART UART1 #define CDC_UART_CLOCK cmuClock_UART1 #define CDC_UART_ROUTE ( UART_ROUTE_RXPEN | UART_ROUTE_TXPEN | \ UART_ROUTE_LOCATION_LOC2 ) #define CDC_UART_TX_PORT gpioPortB #define CDC_UART_TX_PIN 9 #define CDC_UART_RX_PORT gpioPortB #define CDC_UART_RX_PIN 10 // Activate the RS232 switch on DK's. #define CDC_ENABLE_DK_UART_SWITCH() BSP_PeripheralAccess(BSP_RS232_UART, true) // No RS232 switch on STK's. Leave the definition "empty". #define CDC_ENABLE_DK_UART_SWITCH()
Functions | |
void | CDC_Init (void) |
CDC device initialization. | |
int | CDC_SetupCmd (const USB_Setup_TypeDef *setup) |
Handle USB setup commands. Implements CDC class specific commands. More... | |
void | CDC_StateChangeEvent (USBD_State_TypeDef oldState, USBD_State_TypeDef newState) |
Callback function called each time the USB device state is changed. Starts CDC operation when device has been configured by USB host. More... | |
int CDC_SetupCmd | ( | const USB_Setup_TypeDef * | setup | ) |
Handle USB setup commands. Implements CDC class specific commands.
[in] | setup | Pointer to the setup packet received. |
Definition at line 183 of file cdc.c.
References USB_Setup_TypeDef::bRequest, USB_Setup_TypeDef::Direction, USB_Setup_TypeDef::Recipient, USB_Setup_TypeDef::Type, USB_CDC_GETLINECODING, USB_CDC_SETCTRLLINESTATE, USB_CDC_SETLINECODING, USB_SETUP_DIR_IN, USB_SETUP_RECIPIENT_INTERFACE, USB_SETUP_TYPE_CLASS, USB_STATUS_OK, USB_STATUS_REQ_UNHANDLED, USBD_Read(), USBD_Write(), USB_Setup_TypeDef::wIndex, USB_Setup_TypeDef::wLength, and USB_Setup_TypeDef::wValue.
void CDC_StateChangeEvent | ( | USBD_State_TypeDef | oldState, |
USBD_State_TypeDef | newState | ||
) |
Callback function called each time the USB device state is changed. Starts CDC operation when device has been configured by USB host.
[in] | oldState | The device state the device has just left. |
[in] | newState | The new device state. |
Definition at line 241 of file cdc.c.
References DMA, DMA_ActivateBasic(), USBD_Read(), USBD_STATE_CONFIGURED, USBD_STATE_SUSPENDED, USBTIMER_Start(), and USBTIMER_Stop().