From 357ccc577bc6f8710ff942019e16cfa6a08466b7 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Tue, 4 Aug 2009 08:36:30 +0000 Subject: 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. --- Demos/Device/LowLevel/CDC/CDC.c | 29 +++++++--------------- Demos/Device/LowLevel/DualCDC/DualCDC.c | 24 +++++++++---------- Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c | 32 ++++++++++++------------- 3 files changed, 36 insertions(+), 49 deletions(-) (limited to 'Demos') diff --git a/Demos/Device/LowLevel/CDC/CDC.c b/Demos/Device/LowLevel/CDC/CDC.c index 73b486ccd..4b5409f5c 100644 --- a/Demos/Device/LowLevel/CDC/CDC.c +++ b/Demos/Device/LowLevel/CDC/CDC.c @@ -45,16 +45,10 @@ * 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, - .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; - +CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0, + .CharFormat = OneStopBit, + .ParityType = Parity_None, + .DataBits = 8 }; #if 0 /* NOTE: Here you can set up a standard stream using the created virtual serial port, so that the standard stream functions in @@ -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; diff --git a/Demos/Device/LowLevel/DualCDC/DualCDC.c b/Demos/Device/LowLevel/DualCDC/DualCDC.c index dd278d535..654ce863e 100644 --- a/Demos/Device/LowLevel/DualCDC/DualCDC.c +++ b/Demos/Device/LowLevel/DualCDC/DualCDC.c @@ -45,10 +45,10 @@ * 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, - .CharFormat = OneStopBit, - .ParityType = Parity_None, - .DataBits = 8 }; +CDC_Line_Coding_t LineEncoding1 = { .BaudRateBPS = 0, + .CharFormat = OneStopBit, + .ParityType = Parity_None, + .DataBits = 8 }; /** Contains the current baud rate and other settings of the second virtual serial port. While this demo does not use * the physical USART and thus does not use these settings, they must still be retained and returned to the host @@ -58,10 +58,10 @@ 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, - .CharFormat = OneStopBit, - .ParityType = Parity_None, - .DataBits = 8 }; +CDC_Line_Coding_t LineEncoding2 = { .BaudRateBPS = 0, + .CharFormat = OneStopBit, + .ParityType = Parity_None, + .DataBits = 8 }; /** Main program entry point. This routine configures the hardware required by the application, then * starts the scheduler to run the application tasks. @@ -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; diff --git a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c index af963b1fc..2765064f7 100644 --- a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c +++ b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c @@ -36,10 +36,10 @@ * 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; @@ -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); } -- cgit v1.2.3