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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013-2018 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/Version.h>
#include <LUFA/Drivers/Peripheral/SPI.h>
#include <LUFA/Drivers/Misc/RingBuffer.h>
#include <LUFA/Drivers/USB/USB.h>
#include "lufa-descriptor-usbserial.h"
/* Global I/O Buffers: */
static RingBuffer_t USBtoSPI_Buffer;
static uint8_t USBtoSPI_Buffer_Data[128];
static RingBuffer_t SPItoUSB_Buffer;
static uint8_t SPItoUSB_Buffer_Data[128];
/** 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.
*/
USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
{
.Config =
{
.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,
},
},
};
void EVENT_USB_Device_ConfigurationChanged(void)
{
CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
}
void EVENT_USB_Device_ControlRequest(void)
{
CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
}
/* end LUFA CDC-ACM specific definitions */
/* Hardware Defines: */
#define SPI_CS_DDR DDRB
#define SPI_CS_PORT PORTB
#define CS 0
#define RESET_DDR DDRB
#define RESET_PORT PORTB
#define RESET 7
void SetupHardware(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
led_init();
USB_Init();
SPI_Init(SPI_SPEED_FCPU_DIV_16 | SPI_MODE_MASTER | SPI_ORDER_MSB_FIRST |
SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING);
SPI_CS_DDR |= (1<<CS);
SPI_CS_PORT |= (1<<CS);
RESET_DDR |= (1<<RESET);
RESET_PORT |= (1<<RESET);
/* INT0 as input with pull-up */
DDRD &= ~(1<<0);
PORTD |= (1<<0);
EICRA |= (1<<ISC01);
EIFR |= (1<<INTF0);
EIMSK |= (1<<INT0);
}
void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
if(CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR)
RESET_PORT &= ~(1<<RESET);
else
RESET_PORT |= (1<<RESET);
}
void EVENT_CDC_Device_BreakSent(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Duration)
{
SPI_CS_PORT ^= (1<<CS);
}
ISR(INT0_vect)
{
SPI_CS_PORT &= ~(1<<CS);
led_on();
uint8_t ReceivedByte = SPI_ReceiveByte();
RingBuffer_Insert(&SPItoUSB_Buffer, ReceivedByte);
led_off();
SPI_CS_PORT |= (1<<CS);
}
void SPI_SendBuffer(void)
{
SPI_CS_PORT &= ~(1<<CS);
led_on();
while(!(RingBuffer_IsEmpty(&USBtoSPI_Buffer))) {
SPI_SendByte(RingBuffer_Remove(&USBtoSPI_Buffer));
}
led_off();
SPI_CS_PORT |= (1<<CS);
}
int main(void)
{
SetupHardware();
RingBuffer_InitBuffer(&USBtoSPI_Buffer, USBtoSPI_Buffer_Data, sizeof(USBtoSPI_Buffer_Data));
RingBuffer_InitBuffer(&SPItoUSB_Buffer, SPItoUSB_Buffer_Data, sizeof(SPItoUSB_Buffer_Data));
sei();
for (;;) {
/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
if(!(RingBuffer_IsFull(&USBtoSPI_Buffer))) {
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
if (!(ReceivedByte < 0))
RingBuffer_Insert(&USBtoSPI_Buffer, ReceivedByte);
}
uint16_t BufferCount = RingBuffer_GetCount(&SPItoUSB_Buffer);
if (BufferCount) {
Endpoint_SelectEndpoint(VirtualSerial_CDC_Interface.Config.DataINEndpoint.Address);
if (Endpoint_IsINReady()) {
uint8_t BytesToSend = MIN(BufferCount, (CDC_TXRX_EPSIZE - 1));
while (BytesToSend--) {
if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
RingBuffer_Peek(&SPItoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError) {
break;
}
RingBuffer_Remove(&SPItoUSB_Buffer);
}
}
}
if (!(RingBuffer_IsEmpty(&USBtoSPI_Buffer)))
SPI_SendBuffer();
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
}
}
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