diff options
Diffstat (limited to 'Projects/USBtoSerial/USBtoSerial.c')
| -rw-r--r-- | Projects/USBtoSerial/USBtoSerial.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/Projects/USBtoSerial/USBtoSerial.c b/Projects/USBtoSerial/USBtoSerial.c index 3f06acde9..c26667df9 100644 --- a/Projects/USBtoSerial/USBtoSerial.c +++ b/Projects/USBtoSerial/USBtoSerial.c @@ -81,15 +81,21 @@ int main(void) for (;;) { - /* Read bytes from the USB OUT endpoint into the USART transmit buffer */ - int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); - if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUSART_Buffer))) - RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte); + /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */ + if (!(RingBuffer_IsFull(&USBtoUSART_Buffer))) + { + int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); + /* Read bytes from the USB OUT endpoint into the USART transmit buffer */ + if (!(ReceivedByte < 0)) + RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte); + } + /* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */ RingBuff_Count_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer); if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200)) { + /* Clear flush timer expiry flag */ TIFR0 |= (1 << TOV0); /* Read bytes from the USART receive buffer into the USB IN endpoint */ |