diff options
Diffstat (limited to 'Projects')
| -rw-r--r-- | Projects/USBtoSerial/USBtoSerial.c | 14 | ||||
| -rw-r--r-- | Projects/XPLAINBridge/XPLAINBridge.c | 14 |
2 files changed, 20 insertions, 8 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 */ diff --git a/Projects/XPLAINBridge/XPLAINBridge.c b/Projects/XPLAINBridge/XPLAINBridge.c index 8cd1b2dd2..d645ebead 100644 --- a/Projects/XPLAINBridge/XPLAINBridge.c +++ b/Projects/XPLAINBridge/XPLAINBridge.c @@ -119,15 +119,21 @@ void UARTBridge_Task(void) if (USB_DeviceState != DEVICE_STATE_Configured) return; - /* Read bytes from the USB OUT endpoint into the UART transmit buffer */ - int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); - if (!(ReceivedByte < 0) && !(RingBuffer_IsFull(&USBtoUART_Buffer))) - RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte); + /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */ + if (!(RingBuffer_IsFull(&USBtoUART_Buffer))) + { + int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); + /* Read bytes from the USB OUT endpoint into the UART transmit buffer */ + if (!(ReceivedByte < 0)) + RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte); + } + /* Check if the UART receive buffer flush timer has expired or buffer is nearly full */ RingBuff_Count_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer); if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200)) { + /* Clear flush timer expiry flag */ TIFR0 |= (1 << TOV0); /* Read bytes from the UART receive buffer into the USB IN endpoint */ |