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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013-2016 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include "util.h"
#include "led.h"
/*
LUFA Library
Copyright (C) Dean Camera, 2014.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
#include <LUFA/Drivers/USB/USB.h>
#include <LUFA/Drivers/Peripheral/Serial.h>
#include <LUFA/Drivers/Misc/RingBuffer.h>
#include "lufa-descriptor-usbdualserial.h"
static RingBuffer_t USBtoUSART_Buffer;
static uint8_t USBtoUSART_Buffer_Data[128];
static RingBuffer_t USARTtoUSB_Buffer;
static uint8_t USARTtoUSB_Buffer_Data[128];
USB_ClassInfo_CDC_Device_t VirtualSerial1_CDC_Interface =
{
.Config =
{
.ControlInterfaceNumber = INTERFACE_ID_CDC1_CCI,
.DataINEndpoint =
{
.Address = CDC1_TX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.DataOUTEndpoint =
{
.Address = CDC1_RX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.NotificationEndpoint =
{
.Address = CDC1_NOTIFICATION_EPADDR,
.Size = CDC_NOTIFICATION_EPSIZE,
.Banks = 1,
},
},
};
USB_ClassInfo_CDC_Device_t VirtualSerial2_CDC_Interface =
{
.Config =
{
.ControlInterfaceNumber = INTERFACE_ID_CDC2_CCI,
.DataINEndpoint =
{
.Address = CDC2_TX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.DataOUTEndpoint =
{
.Address = CDC2_RX_EPADDR,
.Size = CDC_TXRX_EPSIZE,
.Banks = 1,
},
.NotificationEndpoint =
{
.Address = CDC2_NOTIFICATION_EPADDR,
.Size = CDC_NOTIFICATION_EPSIZE,
.Banks = 1,
},
},
};
void EVENT_USB_Device_ConfigurationChanged(void)
{
CDC_Device_ConfigureEndpoints(&VirtualSerial1_CDC_Interface);
CDC_Device_ConfigureEndpoints(&VirtualSerial2_CDC_Interface);
}
void EVENT_USB_Device_ControlRequest(void)
{
CDC_Device_ProcessControlRequest(&VirtualSerial1_CDC_Interface);
CDC_Device_ProcessControlRequest(&VirtualSerial2_CDC_Interface);
}
void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
if(CDCInterfaceInfo != &VirtualSerial1_CDC_Interface)
return;
uint8_t ConfigMask = 0;
switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
{
case CDC_PARITY_Odd:
ConfigMask = ((1 << UPM11) | (1 << UPM10));
break;
case CDC_PARITY_Even:
ConfigMask = (1 << UPM11);
break;
}
if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
ConfigMask |= (1 << USBS1);
switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
{
case 6:
ConfigMask |= (1 << UCSZ10);
break;
case 7:
ConfigMask |= (1 << UCSZ11);
break;
case 8:
ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
break;
}
/* Keep the TX line held high (idle) while the USART is reconfigured */
PORTD |= (1 << 3);
/* 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));
/* Release the TX line after the USART has been reconfigured */
PORTD &= ~(1 << 3);
}
ISR(USART1_RX_vect, ISR_BLOCK)
{
uint8_t ReceivedByte = UDR1;
if ((USB_DeviceState == DEVICE_STATE_Configured) && !(RingBuffer_IsFull(&USARTtoUSB_Buffer)))
RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
}
void usbserial_init(void)
{
RingBuffer_InitBuffer(&USBtoUSART_Buffer, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data));
RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
}
void usbserial_task(void)
{
if (!(RingBuffer_IsFull(&USBtoUSART_Buffer))) {
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial1_CDC_Interface);
if (!(ReceivedByte < 0))
RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte);
}
uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
if (BufferCount) {
Endpoint_SelectEndpoint(VirtualSerial1_CDC_Interface.Config.DataINEndpoint.Address);
if (Endpoint_IsINReady()) {
uint8_t BytesToSend = MIN(BufferCount, (CDC_TXRX_EPSIZE - 1));
while (BytesToSend--) {
if (CDC_Device_SendByte(&VirtualSerial1_CDC_Interface,
RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError) {
break;
}
RingBuffer_Remove(&USARTtoUSB_Buffer);
}
}
}
if (Serial_IsSendReady() && !(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
CDC_Device_USBTask(&VirtualSerial1_CDC_Interface);
}
/* end LUFA CDC-ACM specific definitions*/
FILE usb_stream;
void stdio_init(void)
{
CDC_Device_CreateStream(&VirtualSerial2_CDC_Interface, &usb_stream);
stdin = &usb_stream;
stdout = &usb_stream;
stderr = &usb_stream;
}
void handle_cmd(uint8_t cmd)
{
switch(cmd) {
case '0': led_off(); break;
case '1': led_on(); break;
case 't': led_toggle(); break;
case 'r': reset2bootloader(); break;
default: printf("unknown command\r\n"); return;
}
printf("ok\r\n");
}
int main(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
led_init();
USB_Init();
stdio_init();
usbserial_init();
sei();
for(;;) {
int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial2_CDC_Interface);
while(BytesReceived > 0) {
int ReceivedByte = fgetc(stdin);
if(ReceivedByte != EOF) {
handle_cmd(ReceivedByte);
}
BytesReceived--;
}
usbserial_task();
CDC_Device_USBTask(&VirtualSerial2_CDC_Interface);
USB_USBTask();
}
}
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