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Added periodic flush timer to the Benito project. Alter the serial transmission code so that sent bytes do not block the remainder of the main program code from running.

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This commit is contained in:
Dean Camera 2010-07-25 11:59:55 +00:00
parent 3a79548dc2
commit 4c9425c0d5
5 changed files with 29 additions and 14 deletions
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33
Projects/Benito/Benito.c
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@ -51,6 +51,9 @@ volatile struct
/** Previous state of the virtual DTR control line from the host */
bool PreviousDTRState = false;
/** Milliseconds remaining until the receive buffer is flushed to the USB host */
uint8_t FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS;
/** LUFA CDC Class driver interface configuration and state information. This structure is
* passed to all CDC Class driver functions, so that multiple instances of the same class
* within a device can be differentiated from one another.
@ -89,23 +92,14 @@ int main(void)
for (;;)
{
/* Echo bytes from the host to the target via the hardware USART */
while (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface) > 0)
if (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface) && (UCSR1A & (1 << UDRE1)))
{
Serial_TxByte(CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
UDR1 = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
LEDs_TurnOnLEDs(LEDMASK_TX);
PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS;
}
/* Echo bytes from the target to the host via the virtual serial port */
while (Tx_Buffer.Count)
{
CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_AtomicRemove(&Tx_Buffer));
LEDs_TurnOnLEDs(LEDMASK_RX);
PulseMSRemaining.RxLEDPulse = TX_RX_LED_PULSE_MS;
}
/* Check if the millisecond timer has elapsed */
if (TIFR0 & (1 << OCF0A))
{
@ -131,6 +125,22 @@ int main(void)
if (PulseMSRemaining.RxLEDPulse && !(--PulseMSRemaining.RxLEDPulse))
LEDs_TurnOffLEDs(LEDMASK_RX);
/* Check if the receive buffer flush period has expired */
if (!(--FlushPeriodRemaining) || (Tx_Buffer.Count > 200))
{
/* Echo bytes from the target to the host via the virtual serial port */
if (Tx_Buffer.Count)
{
while (Tx_Buffer.Count)
CDC_Device_SendByte(&VirtualSerial_CDC_Interface, RingBuffer_AtomicRemove(&Tx_Buffer));
LEDs_TurnOnLEDs(LEDMASK_RX);
PulseMSRemaining.RxLEDPulse = TX_RX_LED_PULSE_MS;
}
FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS;
}
/* Clear the millisecond timer CTC flag (cleared by writing logic one to the register) */
TIFR0 |= (1 << OCF0A);
}
@ -148,7 +158,6 @@ void SetupHardware(void)
wdt_disable();
/* Hardware Initialization */
Serial_Init(9600, false);
LEDs_Init();
USB_Init();