1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* spreadspace avr utils
*
*
* Copyright (C) 2013-2015 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();
}
}
|
