diff options
Diffstat (limited to 'Demos/Device/USBtoSerial/USBtoSerial.c')
| -rw-r--r-- | Demos/Device/USBtoSerial/USBtoSerial.c | 346 |
1 files changed, 60 insertions, 286 deletions
diff --git a/Demos/Device/USBtoSerial/USBtoSerial.c b/Demos/Device/USBtoSerial/USBtoSerial.c index 7cef56560..7c89278ef 100644 --- a/Demos/Device/USBtoSerial/USBtoSerial.c +++ b/Demos/Device/USBtoSerial/USBtoSerial.c @@ -30,38 +30,55 @@ #include "USBtoSerial.h"
-/* Scheduler Task List */
-TASK_LIST
-{
- { .Task = USB_USBTask , .TaskStatus = TASK_STOP },
- { .Task = CDC_Task , .TaskStatus = TASK_STOP },
-};
+RingBuff_t Rx_Buffer;
+RingBuff_t Tx_Buffer;
-/* Globals: */
-/** Contains the current baud rate and other settings of the virtual serial port.
- *
- * These values are set by the host via a class-specific request, and the physical USART should be reconfigured to match the
- * new settings each time they are changed by the host.
- */
-CDC_Line_Coding_t LineCoding = { .BaudRateBPS = 9600,
- .CharFormat = OneStopBit,
- .ParityType = Parity_None,
- .DataBits = 8 };
+USB_ClassInfo_CDC_t VirtualSerial_CDC_Interface =
+ {
+ .ControlInterfaceNumber = 0,
-/** Ring (circular) buffer to hold the RX data - data from the host to the attached device on the serial port. */
-RingBuff_t Rx_Buffer;
+ .DataINEndpointNumber = CDC_TX_EPNUM,
+ .DataINEndpointSize = CDC_TXRX_EPSIZE,
-/** Ring (circular) buffer to hold the TX data - data from the attached device on the serial port to the host. */
-RingBuff_t Tx_Buffer;
+ .DataOUTEndpointNumber = CDC_RX_EPNUM,
+ .DataOUTEndpointSize = CDC_TXRX_EPSIZE,
-/** Flag to indicate if the USART is currently transmitting data from the Rx_Buffer circular buffer. */
-volatile bool Transmitting = false;
+ .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
+ .NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE,
+ };
-/** Main program entry point. This routine configures the hardware required by the application, then
- * starts the scheduler to run the application tasks.
- */
int main(void)
{
+ SetupHardware();
+
+ Buffer_Initialize(&Rx_Buffer);
+ Buffer_Initialize(&Tx_Buffer);
+
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ for (;;)
+ {
+ for (uint8_t DataBytesRem = USB_CDC_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
+ {
+ if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
+ break;
+
+ Buffer_StoreElement(&Rx_Buffer, USB_CDC_ReceiveByte(&VirtualSerial_CDC_Interface));
+ }
+
+ if (Tx_Buffer.Elements)
+ USB_CDC_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Rx_Buffer));
+
+ if (Rx_Buffer.Elements)
+ Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
+
+ USB_CDC_USBTask(&VirtualSerial_CDC_Interface);
+ USB_USBTask();
+ }
+}
+
+void SetupHardware(void)
+{
/* Disable watchdog if enabled by bootloader/fuses */
MCUSR &= ~(1 << WDRF);
wdt_disable();
@@ -70,304 +87,61 @@ int main(void) clock_prescale_set(clock_div_1);
/* Hardware Initialization */
+ Joystick_Init();
LEDs_Init();
- ReconfigureUSART();
-
- /* Ring buffer Initialization */
- Buffer_Initialize(&Rx_Buffer);
- Buffer_Initialize(&Tx_Buffer);
-
- /* Indicate USB not ready */
- UpdateStatus(Status_USBNotReady);
-
- /* Initialize Scheduler so that it can be used */
- Scheduler_Init();
-
- /* Initialize USB Subsystem */
USB_Init();
-
- /* Scheduling - routine never returns, so put this last in the main function */
- Scheduler_Start();
}
-/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
- * starts the library USB task to begin the enumeration and USB management process.
- */
void EVENT_USB_Connect(void)
{
- /* Start USB management task */
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
-
- /* Indicate USB enumerating */
- UpdateStatus(Status_USBEnumerating);
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
}
-/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
- * the status LEDs and stops the USB management and CDC management tasks.
- */
void EVENT_USB_Disconnect(void)
{
- /* Stop running CDC and USB management tasks */
- Scheduler_SetTaskMode(CDC_Task, TASK_STOP);
- Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
-
- /* Reset Tx and Rx buffers, device disconnected */
- Buffer_Initialize(&Rx_Buffer);
- Buffer_Initialize(&Tx_Buffer);
-
- /* Indicate USB not ready */
- UpdateStatus(Status_USBNotReady);
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}
-/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
- * of the USB device after enumeration - the device endpoints are configured and the CDC management task started.
- */
void EVENT_USB_ConfigurationChanged(void)
{
- /* Setup CDC Notification, Rx and Tx Endpoints */
- Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
- ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
- ENDPOINT_BANK_SINGLE);
-
- Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
- ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
- ENDPOINT_BANK_SINGLE);
+ LEDs_SetAllLEDs(LEDMASK_USB_READY);
- Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
- ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
- ENDPOINT_BANK_SINGLE);
-
- /* Indicate USB connected and ready */
- UpdateStatus(Status_USBReady);
-
- /* Start CDC task */
- Scheduler_SetTaskMode(CDC_Task, TASK_RUN);
+ if (!(USB_CDC_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
+ LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
}
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
- * control requests that are not handled internally by the USB library (including the CDC control commands,
- * which are all issued via the control endpoint), so that they can be handled appropriately for the application.
- */
void EVENT_USB_UnhandledControlPacket(void)
{
- uint8_t* LineCodingData = (uint8_t*)&LineCoding;
-
- /* Process CDC specific control requests */
- switch (USB_ControlRequest.bRequest)
- {
- case REQ_GetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* Write the line coding data to the control endpoint */
- Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
-
- /* Finalize the stream transfer to send the last packet or clear the host abort */
- Endpoint_ClearOUT();
- }
-
- break;
- case REQ_SetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* Read the line coding data in from the host into the global struct */
- Endpoint_Read_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
-
- /* Finalize the stream transfer to clear the last packet from the host */
- Endpoint_ClearIN();
-
- /* Reconfigure the USART with the new settings */
- ReconfigureUSART();
- }
-
- break;
- case REQ_SetControlLineState:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
- lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
- CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
- */
-
- /* Acknowledge status stage */
- while (!(Endpoint_IsINReady()));
- Endpoint_ClearIN();
- }
-
- break;
- }
-}
-
-/** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */
-TASK(CDC_Task)
-{
- if (USB_IsConnected)
- {
-#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:
- */
-
- 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
-
- 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())
- {
- /* Read the bytes in from the endpoint into the buffer while space is available */
- while (Endpoint_BytesInEndpoint() && (BUFF_STATICSIZE - Rx_Buffer.Elements))
- {
- /* 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();
- }
- }
-
- /* 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);
-
- /* 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_BytesInEndpoint() < CDC_TXRX_EPSIZE))
- {
- /* 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();
- }
- }
- }
+ USB_CDC_ProcessControlPacket(&VirtualSerial_CDC_Interface);
}
-/** ISR to handle the USART receive complete interrupt, fired each time the USART has received a character. This stores the received
- * character into the Tx_Buffer circular buffer for later transmission to the host.
- */
ISR(USART1_RX_vect, ISR_BLOCK)
{
- /* Only store received characters if the USB interface is connected */
if (USB_IsConnected)
- {
- /* Character received, store it into the buffer */
- Buffer_StoreElement(&Tx_Buffer, UDR1);
- }
+ Buffer_StoreElement(&Tx_Buffer, UDR1);
}
-/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
- * log to a serial port, or anything else that is suitable for status updates.
- *
- * \param CurrentStatus Current status of the system, from the USBtoSerial_StatusCodes_t enum
- */
-void UpdateStatus(uint8_t CurrentStatus)
-{
- uint8_t LEDMask = LEDS_NO_LEDS;
-
- /* Set the LED mask to the appropriate LED mask based on the given status code */
- switch (CurrentStatus)
- {
- case Status_USBNotReady:
- LEDMask = (LEDS_LED1);
- break;
- case Status_USBEnumerating:
- LEDMask = (LEDS_LED1 | LEDS_LED2);
- break;
- case Status_USBReady:
- LEDMask = (LEDS_LED2 | LEDS_LED4);
- break;
- }
-
- /* Set the board LEDs to the new LED mask */
- LEDs_SetAllLEDs(LEDMask);
-}
-
-/** Reconfigures the USART to match the current serial port settings issued by the host as closely as possible. */
-void ReconfigureUSART(void)
+void EVENT_USB_CDC_LineEncodingChanged(USB_ClassInfo_CDC_t* CDCInterfaceInfo)
{
uint8_t ConfigMask = 0;
- /* Determine parity - non odd/even parity mode defaults to no parity */
- if (LineCoding.ParityType == Parity_Odd)
+ if (CDCInterfaceInfo->LineEncoding.ParityType == Parity_Odd)
ConfigMask = ((1 << UPM11) | (1 << UPM10));
- else if (LineCoding.ParityType == Parity_Even)
+ else if (CDCInterfaceInfo->LineEncoding.ParityType == Parity_Even)
ConfigMask = (1 << UPM11);
- /* Determine stop bits - 1.5 stop bits is set as 1 stop bit due to hardware limitations */
- if (LineCoding.CharFormat == TwoStopBits)
+ if (CDCInterfaceInfo->LineEncoding.CharFormat == TwoStopBits)
ConfigMask |= (1 << USBS1);
- /* Determine data size - 5, 6, 7, or 8 bits are supported */
- if (LineCoding.DataBits == 6)
+ if (CDCInterfaceInfo->LineEncoding.DataBits == 6)
ConfigMask |= (1 << UCSZ10);
- else if (LineCoding.DataBits == 7)
+ else if (CDCInterfaceInfo->LineEncoding.DataBits == 7)
ConfigMask |= (1 << UCSZ11);
- else if (LineCoding.DataBits == 8)
+ else if (CDCInterfaceInfo->LineEncoding.DataBits == 8)
ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
- /* Enable double speed, gives better error percentages at 8MHz */
- UCSR1A = (1 << U2X1);
-
- /* Enable transmit and receive modules and interrupts */
+ UCSR1A = (1 << U2X1);
UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
-
- /* Set the USART mode to the mask generated by the Line Coding options */
- UCSR1C = ConfigMask;
-
- /* Set the USART baud rate register to the desired baud rate value */
- UBRR1 = SERIAL_2X_UBBRVAL((uint16_t)LineCoding.BaudRateBPS);
+ UCSR1C = ConfigMask;
+ UBRR1 = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->LineEncoding.BaudRateBPS);
}
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