diff options
Diffstat (limited to 'Demos/Device/LowLevel/USBtoSerial')
| -rw-r--r-- | Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c | 139 |
1 files changed, 70 insertions, 69 deletions
diff --git a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c index c48c33c08..9160dd107 100644 --- a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c +++ b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c @@ -204,89 +204,90 @@ void EVENT_USB_UnhandledControlPacket(void) /** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */
void CDC_Task(void)
{
- if (USB_IsConnected)
- {
+ /* Device must be connected and configured for the task to run */
+ if (!(USB_IsConnected) || !(USB_ConfigurationNumber))
+ return;
+
#if 0
- /* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
- handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
- */
+ /* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
+ handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
+ */
- USB_Notification_Header_t Notification = (USB_Notification_Header_t)
- {
- .NotificationType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
- .Notification = NOTIF_SerialState,
- .wValue = 0,
- .wIndex = 0,
- .wLength = sizeof(uint16_t),
- };
-
- uint16_t LineStateMask;
-
- // Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
+ USB_Notification_Header_t Notification = (USB_Notification_Header_t)
+ {
+ .NotificationType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
+ .Notification = NOTIF_SerialState,
+ .wValue = 0,
+ .wIndex = 0,
+ .wLength = sizeof(uint16_t),
+ };
- Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
- Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
- Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
- Endpoint_ClearIN();
+ uint16_t LineStateMask;
+
+ // Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
+
+ Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
+ Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
+ Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
+ Endpoint_ClearIN();
#endif
- /* Select the Serial Rx Endpoint */
- Endpoint_SelectEndpoint(CDC_RX_EPNUM);
-
- /* Check to see if a packet has been received from the host */
- if (Endpoint_IsOUTReceived())
+ /* Select the Serial Rx Endpoint */
+ Endpoint_SelectEndpoint(CDC_RX_EPNUM);
+
+ /* Check to see if a packet has been received from the host */
+ if (Endpoint_IsOUTReceived())
+ {
+ /* Read the bytes in from the endpoint into the buffer while space is available */
+ while (Endpoint_BytesInEndpoint() && (Rx_Buffer.Elements != BUFF_STATICSIZE))
{
- /* Read the bytes in from the endpoint into the buffer while space is available */
- while (Endpoint_BytesInEndpoint() && (Rx_Buffer.Elements != BUFF_STATICSIZE))
- {
- /* Store each character from the endpoint */
- Buffer_StoreElement(&Rx_Buffer, Endpoint_Read_Byte());
- }
-
- /* Check to see if all bytes in the current packet have been read */
- if (!(Endpoint_BytesInEndpoint()))
- {
- /* Clear the endpoint buffer */
- Endpoint_ClearOUT();
- }
+ /* Store each character from the endpoint */
+ Buffer_StoreElement(&Rx_Buffer, Endpoint_Read_Byte());
}
- /* Check if Rx buffer contains data - if so, send it */
- if (Rx_Buffer.Elements)
- Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
+ /* Check to see if all bytes in the current packet have been read */
+ if (!(Endpoint_BytesInEndpoint()))
+ {
+ /* Clear the endpoint buffer */
+ Endpoint_ClearOUT();
+ }
+ }
+
+ /* Check if Rx buffer contains data - if so, send it */
+ if (Rx_Buffer.Elements)
+ Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
+
+ /* Select the Serial Tx Endpoint */
+ Endpoint_SelectEndpoint(CDC_TX_EPNUM);
- /* Select the Serial Tx Endpoint */
- Endpoint_SelectEndpoint(CDC_TX_EPNUM);
+ /* Check if the Tx buffer contains anything to be sent to the host */
+ if (Tx_Buffer.Elements)
+ {
+ /* Wait until Serial Tx Endpoint Ready for Read/Write */
+ while (!(Endpoint_IsReadWriteAllowed()));
+
+ /* Write the bytes from the buffer to the endpoint while space is available */
+ while (Tx_Buffer.Elements && Endpoint_IsReadWriteAllowed())
+ {
+ /* Write each byte retreived from the buffer to the endpoint */
+ Endpoint_Write_Byte(Buffer_GetElement(&Tx_Buffer));
+ }
+
+ /* Remember if the packet to send completely fills the endpoint */
+ bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
+
+ /* Send the data */
+ Endpoint_ClearIN();
- /* Check if the Tx buffer contains anything to be sent to the host */
- if (Tx_Buffer.Elements)
+ /* If no more data to send and the last packet filled the endpoint, send an empty packet to release
+ * the buffer on the receiver (otherwise all data will be cached until a non-full packet is received) */
+ if (IsFull && !(Tx_Buffer.Elements))
{
/* Wait until Serial Tx Endpoint Ready for Read/Write */
while (!(Endpoint_IsReadWriteAllowed()));
-
- /* Write the bytes from the buffer to the endpoint while space is available */
- while (Tx_Buffer.Elements && Endpoint_IsReadWriteAllowed())
- {
- /* Write each byte retreived from the buffer to the endpoint */
- Endpoint_Write_Byte(Buffer_GetElement(&Tx_Buffer));
- }
-
- /* Remember if the packet to send completely fills the endpoint */
- bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
-
- /* Send the data */
- Endpoint_ClearIN();
- /* If no more data to send and the last packet filled the endpoint, send an empty packet to release
- * the buffer on the receiver (otherwise all data will be cached until a non-full packet is received) */
- if (IsFull && !(Tx_Buffer.Elements))
- {
- /* Wait until Serial Tx Endpoint Ready for Read/Write */
- while (!(Endpoint_IsReadWriteAllowed()));
-
- /* Send an empty packet to terminate the transfer */
- Endpoint_ClearIN();
- }
+ /* Send an empty packet to terminate the transfer */
+ Endpoint_ClearIN();
}
}
}
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