Уважаемые специалисты. Нашёл в интернете код, для подключения АВР к УСБ Чать кода - виндовая программа с драйвером, а часть - прошивка. В виндовой программе я разобрался и понял как изменять чтобы обрабатывать полученные сигналы, и чтобы закидывать свои сигналы в микроконтроллер. А вот с прошивкой оказалось для меня гораздо сложнее. Я никак не найду строк которые занимаются непосредственно отправкой и получением данных.
подозреваю, что процедура usbPoll() отвечает за приём данных. Которые складываются в определённый регистр. но не пойму в какой. А вот отправку вообще не смог найти
Ниже код с основным файлом прошивки ( без инклюдов) а при необходимости, ещё ниже всё вместе зазипованное, но без драйверов, скомпилиных приложений и хэлпов.
/* Name: main.c
* Project: PowerSwitch based on AVR USB driver
* Author: Christian Starkjohann
* Creation Date: 2005-01-16
* Tabsize: 4
* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt) or proprietary (CommercialLicense.txt)
* This Revision: $Id: main.c 523 2008-02-15 09:46:40Z cs $
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/eeprom.h>
#include <avr/wdt.h>
#include "usbdrv.h"
#include "oddebug.h"
#include <util/delay.h>
/*
This module implements an 8 bit parallel output controlled via USB. It is
intended to switch the power supply to computers and/or other electronic
devices.
Application examples:
- Rebooting computers located at the provider's site
- Remotely switch on/off of rarely used computers
- Rebooting other electronic equipment which is left unattended
- Control room heating from remote
*/
#ifndef TEST_DRIVER_SIZE /* define this to check out size of pure driver */
#define EEPROM_LOCATION (void *)37
static uchar actionTimers[8];
/* This is the AT90S2313 version of the routine. Change for others. */
static void outputByte(uchar b)
{
PORTB = (PORTB & ~0xfc) | (b & 0xfc);
PORTD = (PORTD & ~0x30) | ((b << 4) & 0x30);
}
static uchar computeTemporaryChanges(void)
{
uchar i, status = 0, mask = 1;
for(i=0;i<8;i++){
if(actionTimers[i])
status |= mask;
mask <<= 1;
}
return status;
}
static void computeOutputStatus(void)
{
uchar status = eeprom_read_byte(EEPROM_LOCATION) ^ computeTemporaryChanges();
outputByte(status);
}
/* We poll for the timer interrupt instead of declaring an interrupt handler
* with global interrupts enabled. This saves recursion depth. Our timer does
* not need high precision and does not run at a high rate anyway.
*/
static void timerInterrupt(void)
{
static uchar prescaler;
uchar i;
if(!prescaler--){
prescaler = 8; /* rate = 12M / 1024 * 256 * 9 */
for(i=0;i<8;i++){
if(actionTimers[i])
actionTimers[i]--;
}
computeOutputStatus();
}
}
USB_PUBLIC uchar usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
uchar status = eeprom_read_byte(EEPROM_LOCATION);
static uchar replyBuf[2];
usbMsgPtr = replyBuf;
if(rq->bRequest == 0){ /* ECHO */
replyBuf[0] = rq->wValue.bytes[0];
replyBuf[1] = rq->wValue.bytes[1];
return 2;
}
if(rq->bRequest == 1){ /* GET_STATUS -> result = 2 bytes */
replyBuf[0] = status;
replyBuf[1] = computeTemporaryChanges();
return 2;
}
if(rq->bRequest == 2 || rq->bRequest == 3){ /* SWITCH_ON or SWITCH_OFF, index = bit number */
uchar bit = rq->wIndex.bytes[0] & 7;
uchar mask = 1 << bit;
uchar needChange, isOn = status & mask;
if(rq->bRequest == 2){ /* SWITCH_ON */
status |= mask;
needChange = !isOn;
}else{ /* SWITCH_OFF */
status &= ~mask;
needChange = isOn;
}
if(rq->wValue.bytes[0] == 0){ /* duration == 0 -> permanent switch */
actionTimers[bit] = 0;
eeprom_write_byte(EEPROM_LOCATION, status);
}else if(needChange){ /* temporary switch: value = duration in 200ms units */
actionTimers[bit] = rq->wValue.bytes[0];
}
}
computeOutputStatus();
return 0;
}
/* allow some inter-device compatibility */
#if !defined TCCR0 && defined TCCR0B
#define TCCR0 TCCR0B
#endif
#if !defined TIFR && defined TIFR0
#define TIFR TIFR0
#endif
int main(void)
{
uchar i;
wdt_enable(WDTO_1S);
odDebugInit();
DDRD = ~(1 << 2); /* all outputs except PD2 = INT0 */
PORTD = 0;
PORTB = 0; /* no pullups on USB pins */
/* We fake an USB disconnect by pulling D+ and D- to 0 during reset. This is
* necessary if we had a watchdog reset or brownout reset to notify the host
* that it should re-enumerate the device. Otherwise the host's and device's
* concept of the device-ID would be out of sync.
*/
DDRB = ~USBMASK; /* set all pins as outputs except USB */
computeOutputStatus(); /* set output status before we do the delay */
usbDeviceDisconnect(); /* enforce re-enumeration, do this while interrupts are disabled! */
i = 0;
while(--i){ /* fake USB disconnect for > 500 ms */
wdt_reset();
_delay_ms(2);
}
usbDeviceConnect();
TCCR0 = 5; /* set prescaler to 1/1024 */
usbInit();
sei();
for(;;){ /* main event loop */
wdt_reset();
usbPoll();
if(TIFR & (1 << TOV0)){
TIFR |= 1 << TOV0; /* clear pending flag */
timerInterrupt();
}
}
return 0;
}
#else /* TEST_DRIVER_SIZE */
/* This is the minimum do-nothing function to determine driver size. The
* resulting binary will consist of the C startup code, space for interrupt
* vectors and our minimal initialization. The C startup code and vectors
* (together ca. 70 bytes of flash) can not directly be considered a part
* of this driver. The driver is therefore ca. 70 bytes smaller than the
* resulting binary due to this overhead. The driver also contains strings
* of arbitrary length. You can save another ca. 50 bytes if you don't
* include a textual product and vendor description.
*/
uchar usbFunctionSetup(uchar data[8])
{
return 0;
}
int main(void)
{
#ifdef PORTD
PORTD = 0;
DDRD = ~(1 << 2); /* all outputs except PD2 = INT0 */
#endif
PORTB = 0; /* no pullups on USB pins */
DDRB = ~USBMASK; /* all outputs except USB data */
usbInit();
sei();
for(;;){ /* main event loop */
usbPoll();
}
return 0;
}
#endif /* TEST_DRIVER_SIZE */
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