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Better fix for LowLevel CDC demo issue where sending data before the line encoding is set will cause a failure of the host to open the port. Added fix to the DualCDC and USBtoSerial LowLevel demos.

Browse Source
pull/1469/head
Dean Camera 16 years ago
parent eff07bb877
commit 357ccc577b
4 changed files with 37 additions and 49 deletions
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23
Demos/Device/LowLevel/CDC/CDC.c
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@ -45,17 +45,11 @@
* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
* serial link characteristics and instead sends and receives data in endpoint streams.
*/
CDC_Line_Coding_t LineCoding = { .BaudRateBPS = 9600,
CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
.CharFormat = OneStopBit,
.ParityType = Parity_None,
.DataBits = 8 };
/** Indicates if the host has set the device line encoding. Until the line encoding is set by the host, the device should
* not attempt to send any bytes.
*/
bool LineEncodingSet = false;
#if 0
/* NOTE: Here you can set up a standard stream using the created virtual serial port, so that the standard stream functions in
* <stdio.h> can be used on the virtual serial port (e.g. fprintf(&USBSerial, "Test"); to print a string).
@ -65,7 +59,7 @@ static int CDC_putchar(char c, FILE *stream)
{
Endpoint_SelectEndpoint(CDC_TX_EPNUM);
if (!(LineEncodingSet))
if (!(LineEncoding.BaudRateBPS))
return -1;
while (!(Endpoint_IsReadWriteAllowed()))
@ -84,7 +78,7 @@ static int CDC_getchar(FILE *stream)
{
int c;
if (!(LineEncodingSet))
if (!(LineEncoding.BaudRateBPS))
return -1;
Endpoint_SelectEndpoint(CDC_RX_EPNUM);
@ -201,8 +195,6 @@ void EVENT_USB_ConfigurationChanged(void)
*/
void EVENT_USB_UnhandledControlPacket(void)
{
uint8_t* LineCodingData = (uint8_t*)&LineCoding;
/* Process CDC specific control requests */
switch (USB_ControlRequest.bRequest)
{
@ -213,7 +205,7 @@ void EVENT_USB_UnhandledControlPacket(void)
Endpoint_ClearSETUP();
/* Write the line coding data to the control endpoint */
Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(CDC_Line_Coding_t));
Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
/* Finalize the stream transfer to send the last packet or clear the host abort */
Endpoint_ClearOUT();
@ -227,10 +219,7 @@ 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(CDC_Line_Coding_t));
/* Indicate that the line encoding has been set, and the device may now send data */
LineEncodingSet = true;
Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
/* Finalize the stream transfer to clear the last packet from the host */
Endpoint_ClearIN();
@ -314,7 +303,7 @@ void CDC_Task(void)
{
ActionSent = false;
}
else if ((ActionSent == false) && LineEncodingSet)
else if ((ActionSent == false) && LineEncoding.BaudRateBPS)
{
ActionSent = true;

12
Demos/Device/LowLevel/DualCDC/DualCDC.c
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@ -45,7 +45,7 @@
* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
* serial link characteristics and instead sends and receives data in endpoint streams.
*/
CDC_Line_Coding_t LineCoding1 = { .BaudRateBPS = 9600,
CDC_Line_Coding_t LineEncoding1 = { .BaudRateBPS = 0,
.CharFormat = OneStopBit,
.ParityType = Parity_None,
.DataBits = 8 };
@ -58,7 +58,7 @@ CDC_Line_Coding_t LineCoding1 = { .BaudRateBPS = 9600,
* It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
* serial link characteristics and instead sends and receives data in endpoint streams.
*/
CDC_Line_Coding_t LineCoding2 = { .BaudRateBPS = 9600,
CDC_Line_Coding_t LineEncoding2 = { .BaudRateBPS = 0,
.CharFormat = OneStopBit,
.ParityType = Parity_None,
.DataBits = 8 };
@ -172,7 +172,7 @@ void EVENT_USB_ConfigurationChanged(void)
void EVENT_USB_UnhandledControlPacket(void)
{
/* Determine which interface's Line Coding data is being set from the wIndex parameter */
uint8_t* LineCodingData = (USB_ControlRequest.wIndex == 0) ? (uint8_t*)&LineCoding1 : (uint8_t*)&LineCoding2;
uint8_t* LineEncodingData = (USB_ControlRequest.wIndex == 0) ? (uint8_t*)&LineEncoding1 : (uint8_t*)&LineEncoding2;
/* Process CDC specific control requests */
switch (USB_ControlRequest.bRequest)
@ -184,7 +184,7 @@ void EVENT_USB_UnhandledControlPacket(void)
Endpoint_ClearSETUP();
/* Write the line coding data to the control endpoint */
Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(CDC_Line_Coding_t));
Endpoint_Write_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
/* Finalize the stream transfer to send the last packet or clear the host abort */
Endpoint_ClearOUT();
@ -198,7 +198,7 @@ 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(CDC_Line_Coding_t));
Endpoint_Read_Control_Stream_LE(LineEncodingData, sizeof(CDC_Line_Coding_t));
/* Finalize the stream transfer to clear the last packet from the host */
Endpoint_ClearIN();
@ -256,7 +256,7 @@ void CDC1_Task(void)
{
ActionSent = false;
}
else if (ActionSent == false)
else if ((ActionSent == false) && LineEncoding1.BaudRateBPS)
{
ActionSent = true;

26
Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c
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@ -36,7 +36,7 @@
* 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,
CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
.CharFormat = OneStopBit,
.ParityType = Parity_None,
.DataBits = 8 };
@ -145,8 +145,6 @@ void EVENT_USB_ConfigurationChanged(void)
*/
void EVENT_USB_UnhandledControlPacket(void)
{
uint8_t* LineCodingData = (uint8_t*)&LineCoding;
/* Process CDC specific control requests */
switch (USB_ControlRequest.bRequest)
{
@ -157,7 +155,7 @@ 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();
@ -171,7 +169,7 @@ 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();
@ -259,7 +257,7 @@ void CDC_Task(void)
Endpoint_SelectEndpoint(CDC_TX_EPNUM);
/* Check if the Tx buffer contains anything to be sent to the host */
if (Tx_Buffer.Elements)
if ((Tx_Buffer.Elements) && LineEncoding.BaudRateBPS)
{
/* Wait until Serial Tx Endpoint Ready for Read/Write */
while (!(Endpoint_IsReadWriteAllowed()))
@ -304,7 +302,7 @@ void CDC_Task(void)
ISR(USART1_RX_vect, ISR_BLOCK)
{
/* Only store received characters if the USB interface is connected */
if (USB_DeviceState != DEVICE_STATE_Configured)
if ((USB_DeviceState != DEVICE_STATE_Configured) && LineEncoding.BaudRateBPS)
Buffer_StoreElement(&Tx_Buffer, UDR1);
}
@ -314,21 +312,21 @@ 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 */
@ -341,5 +339,5 @@ 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);
}

1
LUFA/ManPages/ChangeLog.txt
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@ -68,6 +68,7 @@
* to only unfreeze and check one data pipe at a time) to prevent incorrect device enumerations and freezes while trasferring data
* - Make Pipe_ConfigurePipe() mask the given endpoint number against PIPE_EPNUM_MASK to ensure the endpoint IN direction bit is
* cleared to prevent endpoint type corruption
* - Fixed issue opening CDC-ACM ports on hosts when the CDC device tries to send data before the host has set the line encoding
* - Fixed USB_OPT_MANUAL_PLL option being ignored during device disconnects on some models (thanks to Brian Dickman)
* - Fixed documentation mentioning Pipe_GetCurrentToken() function when correct function name is Pipe_GetPipeToken()
* - Fixed ADC driver for the ATMEGA32U4 and ATMEGA16U4 (thanks to Opendous Inc.)

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