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
|
/* Name: main.c
* Project: custom-class, a basic USB example
* Author: Christian Starkjohann
* Creation Date: 2008-04-09
* Tabsize: 4
* Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
* This Revision: $Id$
*/
/*
This example should run on most AVRs with only little changes. No special
hardware resources except INT0 are used. You may have to change usbconfig.h for
different I/O pins for USB. Please note that USB D+ must be the INT0 pin, or
at least be connected to INT0 as well.
We assume that an LED is connected to port B bit 0. If you connect it to a
different port or bit, change the macros below:
*/
#define LED_PORT_DDR DDRB
#define LED_PORT_OUTPUT PORTB
#define LED_BIT 0
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h> /* for sei() */
#include <util/delay.h> /* for _delay_ms() */
#include <avr/pgmspace.h> /* required by usbdrv.h */
#include "usbdrv.h"
#include "oddebug.h" /* This is also an example for using debug macros */
#include "requests.h" /* The custom request numbers we use */
/* ------------------------------------------------------------------------- */
/* ----------------------------- USB interface ----------------------------- */
/* ------------------------------------------------------------------------- */
usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
static uchar dataBuffer[4]; /* buffer must stay valid when usbFunctionSetup returns */
if(rq->bRequest == CUSTOM_RQ_ECHO){ /* echo -- used for reliability tests */
dataBuffer[0] = rq->wValue.bytes[0];
dataBuffer[1] = rq->wValue.bytes[1];
dataBuffer[2] = rq->wIndex.bytes[0];
dataBuffer[3] = rq->wIndex.bytes[1];
usbMsgPtr = dataBuffer; /* tell the driver which data to return */
return 4;
}else if(rq->bRequest == CUSTOM_RQ_SET_STATUS){
if(rq->wValue.bytes[0] & 1){ /* set LED */
LED_PORT_OUTPUT |= _BV(LED_BIT);
}else{ /* clear LED */
LED_PORT_OUTPUT &= ~_BV(LED_BIT);
}
}else if(rq->bRequest == CUSTOM_RQ_GET_STATUS){
dataBuffer[0] = ((LED_PORT_OUTPUT & _BV(LED_BIT)) != 0);
usbMsgPtr = dataBuffer; /* tell the driver which data to return */
return 1; /* tell the driver to send 1 byte */
}
return 0; /* default for not implemented requests: return no data back to host */
}
/* ------------------------------------------------------------------------- */
int __attribute__((noreturn)) main(void)
{
uchar i;
wdt_enable(WDTO_1S);
/* Even if you don't use the watchdog, turn it off here. On newer devices,
* the status of the watchdog (on/off, period) is PRESERVED OVER RESET!
*/
/* RESET status: all port bits are inputs without pull-up.
* That's the way we need D+ and D-. Therefore we don't need any
* additional hardware initialization.
*/
odDebugInit();
DBG1(0x00, 0, 0); /* debug output: main starts */
usbInit();
usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */
i = 0;
while(--i){ /* fake USB disconnect for > 250 ms */
wdt_reset();
_delay_ms(1);
}
usbDeviceConnect();
LED_PORT_DDR |= _BV(LED_BIT); /* make the LED bit an output */
sei();
DBG1(0x01, 0, 0); /* debug output: main loop starts */
for(;;){ /* main event loop */
DBG1(0x02, 0, 0); /* debug output: main loop iterates */
wdt_reset();
usbPoll();
}
}
/* ------------------------------------------------------------------------- */
|
