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/*
* spreadspace avr utils
*
*
* Copyright (C) 2012 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, 2012.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
#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 SPItoUSB_Buffer;
static uint8_t SPItoUSB_Buffer_Data[8];
/** 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 = 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,
},
};
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 PWRDWN_DDR DDRB
#define PWRDWN_PORT PORTB
#define PWRDWN 7
#define INT_DDR DDRD
#define INT_PORT PORTD
#define INT_PIN PIND
#define INT 0
void SetupHardware(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
led_init();
USB_Init();
TCCR0B = (1 << CS02);
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);
PWRDWN_DDR |= (1<<PWRDWN);
PWRDWN_PORT |= (1<<PWRDWN);
INT_DDR &= ~(1<<INT);
INT_PORT |= (1<<INT);
}
void IDM_SendCmd(uint8_t cmd)
{
led_on();
SPI_CS_PORT &= ~(1<<CS);
SPI_SendByte(cmd);
SPI_CS_PORT |= (1<<CS);
led_off();
}
void IDM_ReadData(void)
{
led_on();
SPI_CS_PORT &= ~(1<<CS);
_delay_us(100);
SPI_SendByte('r');
_delay_us(50);
uint8_t int_state = (INT_PIN & (1<<INT));
while(!int_state) {
uint8_t ReceivedByte = SPI_ReceiveByte();
RingBuffer_Insert(&SPItoUSB_Buffer, ReceivedByte);
if(RingBuffer_IsFull(&SPItoUSB_Buffer))
break;
_delay_us(30);
int_state = (INT_PIN & (1<<INT));
}
_delay_us(100);
SPI_CS_PORT |= (1<<CS);
led_off();
}
int main(void)
{
SetupHardware();
RingBuffer_InitBuffer(&SPItoUSB_Buffer, SPItoUSB_Buffer_Data, sizeof(SPItoUSB_Buffer_Data));
sei();
for (;;) {
int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
while(BytesReceived > 0) {
int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
if (!(ReceivedByte < 0)) {
switch(ReceivedByte) {
case 'p': PWRDWN_PORT &= ~(1<<PWRDWN); break;
case 'P': PWRDWN_PORT |= (1<<PWRDWN); break;
case 'r': break;
default: IDM_SendCmd(ReceivedByte); break;
}
}
BytesReceived--;
}
if(!(INT_PIN & (1<<INT)))
IDM_ReadData();
uint16_t BufferCount = RingBuffer_GetCount(&SPItoUSB_Buffer);
if ((TIFR0 & (1 << TOV0)) || (BufferCount > (uint8_t)(sizeof(SPItoUSB_Buffer_Data) * .75))) {
TIFR0 |= (1 << TOV0);
while (BufferCount--) {
if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
RingBuffer_Peek(&SPItoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
break;
RingBuffer_Remove(&SPItoUSB_Buffer);
}
}
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
}
}
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