Re-add deleted linker options to the Bootloader makefiles, which was preventing the...

[pub/lufa.git] / Projects / USBtoSerial / USBtoSerial.c

diff --git a/Projects/USBtoSerial/USBtoSerial.c b/Projects/USBtoSerial/USBtoSerial.c
index 145047c..4f3fcf5 100644 (file)
--- a/Projects/USBtoSerial/USBtoSerial.c
+++ b/Projects/USBtoSerial/USBtoSerial.c
@@ -82,15 +82,11 @@ int main(void)
        for (;;)
        {
                /* Read bytes from the USB OUT endpoint into the USART transmit buffer */
-               for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
-               {
-                       if (!(BUFFER_SIZE - USBtoUSART_Buffer.Count))
-                         break;
-                         
-                       RingBuffer_AtomicInsert(&USBtoUSART_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
-               }
+               int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
+               if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUSART_Buffer)))
+                 RingBuffer_AtomicInsert(&USBtoUSART_Buffer, (uint8_t)ReceivedByte);           
                
-               /* Check if the software USART flush timer has expired */
+               /* Check if the UART receive buffer flush timer has expired */
                if (TIFR0 & (1 << TOV0))
                {
                        TIFR0 |= (1 << TOV0);
@@ -120,7 +116,6 @@ void SetupHardware(void)
        clock_prescale_set(clock_div_1);
 
        /* Hardware Initialization */
-       Serial_Init(9600, false);
        LEDs_Init();
        USB_Init();
 
@@ -199,9 +194,17 @@ void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCI
                        ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
                        break;
        }
+
+       /* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */
+       UCSR1B = 0;
+       UCSR1A = 0;
+       UCSR1C = 0;
+
+       /* Set the new baud rate before configuring the USART */
+       UBRR1  = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
        
+       /* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */
+       UCSR1C = ConfigMask;
        UCSR1A = (1 << U2X1);   
        UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
-       UCSR1C = ConfigMask;    
-       UBRR1  = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 }