/*
LUFA Library
- Copyright (C) Dean Camera, 2010.
-
+ Copyright (C) Dean Camera, 2015.
+
dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
+ www.lufa-lib.org
*/
/*
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2015 Dean Camera (dean [at] fourwalledcubicle [dot] com)
- Permission to use, copy, modify, distribute, and sell this
+ Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
+ without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
#include "Benito.h"
/** Circular buffer to hold data from the serial port before it is sent to the host. */
-RingBuff_t Tx_Buffer;
+static RingBuffer_t USARTtoUSB_Buffer;
+
+/** Underlying data buffer for \ref USARTtoUSB_Buffer, where the stored bytes are located. */
+static uint8_t USARTtoUSB_Buffer_Data[128];
/** Pulse generation counters to keep track of the number of milliseconds remaining for each pulse type */
volatile struct
uint8_t PingPongLEDPulse; /**< Milliseconds remaining for enumeration Tx/Rx ping-pong LED pulse */
} PulseMSRemaining;
-/** 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;
*/
USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
{
- .Config =
+ .Config =
{
- .ControlInterfaceNumber = 0,
-
- .DataINEndpointNumber = CDC_TX_EPNUM,
- .DataINEndpointSize = CDC_TXRX_EPSIZE,
- .DataINEndpointDoubleBank = false,
-
- .DataOUTEndpointNumber = CDC_RX_EPNUM,
- .DataOUTEndpointSize = CDC_TXRX_EPSIZE,
- .DataOUTEndpointDoubleBank = false,
-
- .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
- .NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE,
- .NotificationEndpointDoubleBank = false,
+ .ControlInterfaceNumber = INTERFACE_ID_CDC_CCI,
+ .DataINEndpoint =
+ {
+ .Address = CDC_TX_EPADDR,
+ .Size = CDC_TXRX_EPSIZE,
+ .Banks = 1,
+ },
+ .DataOUTEndpoint =
+ {
+ .Address = CDC_RX_EPADDR,
+ .Size = CDC_TXRX_EPSIZE,
+ .Banks = 1,
+ },
+ .NotificationEndpoint =
+ {
+ .Address = CDC_NOTIFICATION_EPADDR,
+ .Size = CDC_NOTIFICATION_EPSIZE,
+ .Banks = 1,
+ },
},
};
int main(void)
{
SetupHardware();
-
- RingBuffer_InitBuffer(&Tx_Buffer);
-
- sei();
+
+ RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
+
+ GlobalInterruptEnable();
for (;;)
{
/* Echo bytes from the host to the target via the hardware USART */
- if (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface) && (UCSR1A & (1 << UDRE1)))
+ if ((UCSR1A & (1 << UDRE1)) && CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
{
UDR1 = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
LEDs_TurnOnLEDs(LEDMASK_TX);
- PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS;
+ PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS;
}
-
+
/* Check if the millisecond timer has elapsed */
if (TIFR0 & (1 << OCF0A))
{
+ /* Clear flush timer expiry flag */
+ TIFR0 |= (1 << TOV0);
+
/* Check if the reset pulse period has elapsed, if so tristate the target reset line */
if (PulseMSRemaining.ResetPulse && !(--PulseMSRemaining.ResetPulse))
{
LEDs_TurnOffLEDs(LEDMASK_BUSY);
AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK;
}
-
+
/* Check if the LEDs should be ping-ponging (during enumeration) */
if (PulseMSRemaining.PingPongLEDPulse && !(--PulseMSRemaining.PingPongLEDPulse))
{
LEDs_ToggleLEDs(LEDMASK_TX | LEDMASK_RX);
PulseMSRemaining.PingPongLEDPulse = PING_PONG_LED_PULSE_MS;
}
-
+
/* Turn off TX LED(s) once the TX pulse period has elapsed */
if (PulseMSRemaining.TxLEDPulse && !(--PulseMSRemaining.TxLEDPulse))
LEDs_TurnOffLEDs(LEDMASK_TX);
LEDs_TurnOffLEDs(LEDMASK_RX);
/* Check if the receive buffer flush period has expired */
- if (!(--FlushPeriodRemaining) || (Tx_Buffer.Count > 200))
+ uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
+ if (!(--FlushPeriodRemaining) || (BufferCount > 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));
+ FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS;
+ /* Start RX LED indicator pulse */
+ if (BufferCount)
+ {
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);
+ /* Echo bytes from the target to the host via the virtual serial port */
+ while (BufferCount--)
+ {
+ /* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
+ if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
+ RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
+ {
+ break;
+ }
+
+ /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
+ RingBuffer_Remove(&USARTtoUSB_Buffer);
+ }
+ }
}
-
+
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
}
/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
{
+#if (ARCH == ARCH_AVR8)
/* Disable watchdog if enabled by bootloader/fuses */
MCUSR &= ~(1 << WDRF);
wdt_disable();
+ /* Disable clock division */
+ clock_prescale_set(clock_div_1);
+#endif
+
/* Hardware Initialization */
LEDs_Init();
USB_Init();
OCR0A = (F_CPU / 64 / 1000);
TCCR0A = (1 << WGM01);
TCCR0B = ((1 << CS01) | (1 << CS00));
-
+
/* Tristate target /RESET Line */
AVR_RESET_LINE_PORT &= ~AVR_RESET_LINE_MASK;
AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK;
/** Event handler for the library USB Configuration Changed event. */
void EVENT_USB_Device_ConfigurationChanged(void)
{
+ bool ConfigSuccess = true;
+
+ ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
+
PulseMSRemaining.PingPongLEDPulse = 0;
- LEDs_SetAllLEDs(LEDS_NO_LEDS);
- if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
- LEDs_SetAllLEDs(LEDMASK_ERROR);
+ LEDs_SetAllLEDs(ConfigSuccess ? LEDS_NO_LEDS : LEDMASK_ERROR);
}
-/** Event handler for the library USB Unhandled Control Request event. */
-void EVENT_USB_Device_UnhandledControlRequest(void)
+/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
+ * the device from the USB host before passing along unhandled control requests to the library for processing
+ * internally.
+ */
+void EVENT_USB_Device_ControlRequest(void)
{
CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
}
switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
{
case CDC_PARITY_Odd:
- ConfigMask = ((1 << UPM11) | (1 << UPM10));
+ ConfigMask = ((1 << UPM11) | (1 << UPM10));
break;
case CDC_PARITY_Even:
- ConfigMask = (1 << UPM11);
+ ConfigMask = (1 << UPM11);
break;
}
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);
}
/** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
uint8_t ReceivedByte = UDR1;
if (USB_DeviceState == DEVICE_STATE_Configured)
- RingBuffer_Insert(&Tx_Buffer, ReceivedByte);
+ RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
}
/** Event handler for the CDC Class driver Host-to-Device Line Encoding Changed event.
*/
void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
- bool CurrentDTRState = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR);
+ static bool PreviousDTRState = false;
+ bool CurrentDTRState = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR);
/* Check if the DTR line has been asserted - if so, start the target AVR's reset pulse */
if (!(PreviousDTRState) && CurrentDTRState)
{
LEDs_SetAllLEDs(LEDMASK_BUSY);
-
+
AVR_RESET_LINE_DDR |= AVR_RESET_LINE_MASK;
PulseMSRemaining.ResetPulse = AVR_RESET_PULSE_MS;
}
-
+
PreviousDTRState = CurrentDTRState;
}
+
projects / pub / USBasp.git / blobdiff