X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/b9b03aadb219d06fbad9d110e508db93e45461af..3ffa7543a05761a0c69144c9b66196b08d8f1249:/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c

diff --git a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c
index 7cef56560..92449a67d 100644
--- a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c
+++ b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c
@@ -30,23 +30,16 @@
 
 #include "USBtoSerial.h"
 
-/* Scheduler Task List */
-TASK_LIST
-{
-	{ .Task = USB_USBTask          , .TaskStatus = TASK_STOP },
-	{ .Task = CDC_Task             , .TaskStatus = TASK_STOP },
-};
-
 /* 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            };
+CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
+                                   .CharFormat  = OneStopBit,
+                                   .ParityType  = Parity_None,
+                                   .DataBits    = 8            };
 
 /** Ring (circular) buffer to hold the RX data - data from the host to the attached device on the serial port. */
 RingBuff_t Rx_Buffer;
@@ -62,6 +55,24 @@ volatile bool Transmitting = false;
  */
 int main(void)
 {
+	SetupHardware();
+
+	/* Ring buffer Initialization */
+	Buffer_Initialize(&Rx_Buffer);
+	Buffer_Initialize(&Tx_Buffer);
+
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+	
+	for (;;)
+	{
+		CDC_Task();
+		USB_USBTask();
+	}
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
+{
 	/* Disable watchdog if enabled by bootloader/fuses */
 	MCUSR &= ~(1 << WDRF);
 	wdt_disable();
@@ -70,88 +81,73 @@ int main(void)
 	clock_prescale_set(clock_div_1);
 
 	/* Hardware Initialization */
+	Serial_Init(9600, false);
 	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)
+void EVENT_USB_Device_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);
-	
+void EVENT_USB_Device_Disconnect(void)
+{	
 	/* 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)
+void EVENT_USB_Device_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);
+	/* Indicate USB connected and ready */
+	LEDs_SetAllLEDs(LEDMASK_USB_READY);
 
-	Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
-		                       ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
-	                           ENDPOINT_BANK_SINGLE);
+	/* Setup CDC Notification, Rx and Tx Endpoints */
+	if (!(Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
+		                             ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}
+	
+	if (!(Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
+		                             ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}							   
 
-	/* Indicate USB connected and ready */
-	UpdateStatus(Status_USBReady);
+	if (!(Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
+		                             ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
+	                                 ENDPOINT_BANK_SINGLE)))
+	{
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	}
 
-	/* Start CDC task */
-	Scheduler_SetTaskMode(CDC_Task, TASK_RUN);
+	/* Reset line encoding baud rate so that the host knows to send new values */
+	LineEncoding.BaudRateBPS = 0;
 }
 
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
+/** Event handler for the USB_UnhandledControlRequest 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)
+void EVENT_USB_Device_UnhandledControlRequest(void)
 {
-	uint8_t* LineCodingData = (uint8_t*)&LineCoding;
-
 	/* Process CDC specific control requests */
 	switch (USB_ControlRequest.bRequest)
 	{
@@ -162,7 +158,7 @@ void EVENT_USB_UnhandledControlPacket(void)
 				Endpoint_ClearSETUP();
 
 				/* Write the line coding data to the control endpoint */
-				Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
+				Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(LineEncoding));
 				
 				/* Finalize the stream transfer to send the last packet or clear the host abort */
 				Endpoint_ClearOUT();
@@ -176,7 +172,7 @@ void EVENT_USB_UnhandledControlPacket(void)
 				Endpoint_ClearSETUP();
 
 				/* Read the line coding data in from the host into the global struct */
-				Endpoint_Read_Control_Stream_LE(LineCodingData, sizeof(LineCoding));
+				Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(LineEncoding));
 
 				/* Finalize the stream transfer to clear the last packet from the host */
 				Endpoint_ClearIN();
@@ -197,9 +193,7 @@ void EVENT_USB_UnhandledControlPacket(void)
 						 CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
 				*/
 
-				/* Acknowledge status stage */
-				while (!(Endpoint_IsINReady()));
-				Endpoint_ClearIN();
+				Endpoint_ClearStatusStage();
 			}
 	
 			break;
@@ -207,91 +201,92 @@ void EVENT_USB_UnhandledControlPacket(void)
 }
 
 /** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */
-TASK(CDC_Task)
+void CDC_Task(void)
 {
-	if (USB_IsConnected)
-	{
+	/* Device must be connected and configured for the task to run */
+	if (USB_DeviceState != DEVICE_STATE_Configured)
+	  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() && (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();
-			}
+			/* 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)
+	/* Check if the Tx buffer contains anything to be sent to the host */
+	if ((Tx_Buffer.Elements) && LineEncoding.BaudRateBPS)
+	{
+		/* Wait until Serial Tx Endpoint Ready for Read/Write */
+		Endpoint_WaitUntilReady();
+		
+		/* 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()));
-			
-			/* 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_WaitUntilReady();
+				
+			/* Send an empty packet to terminate the transfer */
 			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();
-			}
 		}
 	}
 }
@@ -301,39 +296,11 @@ TASK(CDC_Task)
  */
 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);
-	}
-}
+	uint8_t ReceivedByte = 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);
+	/* Only store received characters if the USB interface is connected */
+	if ((USB_DeviceState == DEVICE_STATE_Configured) && LineEncoding.BaudRateBPS)
+	  Buffer_StoreElement(&Tx_Buffer, ReceivedByte);
 }
 
 /** Reconfigures the USART to match the current serial port settings issued by the host as closely as possible. */
@@ -342,21 +309,21 @@ void ReconfigureUSART(void)
 	uint8_t ConfigMask = 0;
 
 	/* Determine parity - non odd/even parity mode defaults to no parity */
-	if (LineCoding.ParityType == Parity_Odd)
+	if (LineEncoding.ParityType == Parity_Odd)
 	  ConfigMask = ((1 << UPM11) | (1 << UPM10));
-	else if (LineCoding.ParityType == Parity_Even)
+	else if (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 (LineEncoding.CharFormat == TwoStopBits)
 	  ConfigMask |= (1 << USBS1);
 
 	/* Determine data size - 5, 6, 7, or 8 bits are supported */
-	if (LineCoding.DataBits == 6)
+	if (LineEncoding.DataBits == 6)
 	  ConfigMask |= (1 << UCSZ10);
-	else if (LineCoding.DataBits == 7)
+	else if (LineEncoding.DataBits == 7)
 	  ConfigMask |= (1 << UCSZ11);
-	else if (LineCoding.DataBits == 8)
+	else if (LineEncoding.DataBits == 8)
 	  ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 	
 	/* Enable double speed, gives better error percentages at 8MHz */
@@ -369,5 +336,5 @@ void ReconfigureUSART(void)
 	UCSR1C = ConfigMask;
 	
 	/* Set the USART baud rate register to the desired baud rate value */
-	UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)LineCoding.BaudRateBPS);
+	UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)LineEncoding.BaudRateBPS);
 }