i'm completely new to v-usb (and only got realy small knowledge to AVR)
I've a Curcuit for USB Generic Hid (including an ISP-Port) and try to make a Generic HID device, to get the status of a potentiometer.
I managed to get the "hid-custom-rq" example to work and now i'm trying to add a new request.
The problem is, that i wanted to test multiple byte answer (to report back the value from the potentiometer) so i added the request id 3 (CUSTOM_RQ_GET_POTI) and set the dataBuffer to the size of 4 and then to [0] = 0 ; [1] = 1 ; [2] = 1. All works fine i think, but on the client side, i only get the first byte and the others are random (or zero if i first clear the buffer)
could anybody give me a hint what i#m doing wrong?
here is the code for the usb device
request.h
Code: Select all
/* Name: requests.h
* 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: requests.h 692 2008-11-07 15:07:40Z cs $
*/
/* This header is shared between the firmware and the host software. It
* defines the USB request numbers (and optionally data types) used to
* communicate between the host and the device.
*/
#ifndef __REQUESTS_H_INCLUDED__
#define __REQUESTS_H_INCLUDED__
#define CUSTOM_RQ_SET_STATUS 1
/* Set the LED status. Control-OUT.
* The requested status is passed in the "wValue" field of the control
* transfer. No OUT data is sent. Bit 0 of the low byte of wValue controls
* the LED.
*/
#define CUSTOM_RQ_GET_STATUS 2
/* Get the current LED status. Control-IN.
* This control transfer involves a 1 byte data phase where the device sends
* the current status to the host. The status is in bit 0 of the byte.
*/
#define CUSTOM_RQ_GET_POTI 3
#endif /* __REQUESTS_H_INCLUDED__ */
main.c
Code: Select all
/* Name: main.c
* Project: hid-custom-rq example
* Author: Christian Starkjohann
* Creation Date: 2008-04-07
* 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: main.c 790 2010-05-30 21:00:26Z cs $
*/
/*
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 ----------------------------- */
/* ------------------------------------------------------------------------- */
PROGMEM char usbHidReportDescriptor[22] = { /* USB report descriptor */
0x06, 0x00, 0xff, // USAGE_PAGE (Generic Desktop)
0x09, 0x01, // USAGE (Vendor Usage 1)
0xa1, 0x01, // COLLECTION (Application)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x01, // REPORT_COUNT (1)
0x09, 0x00, // USAGE (Undefined)
0xb2, 0x02, 0x01, // FEATURE (Data,Var,Abs,Buf)
0xc0 // END_COLLECTION
};
/* The descriptor above is a dummy only, it silences the drivers. The report
* it describes consists of one byte of undefined data.
* We don't transfer our data through HID reports, we use custom requests
* instead.
*/
/* ------------------------------------------------------------------------- */
usbMsgLen_t usbFunctionSetup(uchar data[8])
{
usbRequest_t *rq = (void *)data;
if((rq->bmRequestType & USBRQ_TYPE_MASK) == USBRQ_TYPE_VENDOR){
DBG1(0x50, &rq->bRequest, 1); /* debug output: print our request */
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){
static uchar dataBuffer[1]; /* buffer must stay valid when usbFunctionSetup returns */
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 */
}else if(rq->bRequest == CUSTOM_RQ_GET_POTI) {
static uchar dataBuffer[3]; /* buffer must stay valid when usbFunctionSetup returns */
//dataBuffer[0] = ((LED_PORT_OUTPUT & _BV(LED_BIT)) != 0);
dataBuffer[0] = 0;
dataBuffer[1] = 1;
dataBuffer[2] = 1;
usbMsgPtr = dataBuffer; /* tell the driver which data to return */
return 1; /* tell the driver to send 1 byte */
}
}else{
/* calss requests USBRQ_HID_GET_REPORT and USBRQ_HID_SET_REPORT are
* not implemented since we never call them. The operating system
* won't call them either because our descriptor defines no meaning.
*/
}
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 */
#if 0 /* this is a bit too aggressive for a debug output */
DBG2(0x02, 0, 0); /* debug output: main loop iterates */
#endif
wdt_reset();
usbPoll();
}
}
/* ------------------------------------------------------------------------- */
and here the code for the client.
set_led.cpp
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/* Name: set-led.c
* Project: hid-custom-rq example
* Author: Christian Starkjohann
* Creation Date: 2008-04-10
* 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: set-led.c 692 2008-11-07 15:07:40Z cs $
*/
/*
General Description:
This is the host-side driver for the custom-class example device. It searches
the USB for the LEDControl device and sends the requests understood by this
device.
This program must be linked with libusb on Unix and libusb-win32 on Windows.
See http://libusb.sourceforge.net/ or http://libusb-win32.sourceforge.net/
respectively.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <usb.h> /* this is libusb */
#include <lusb0_usb.h>
#include "opendevice.h" /* common code moved to separate module */
#include "requests.h" /* custom request numbers */
#include "usbconfig.h" /* device's VID/PID and names */
static void usage(char *name)
{
fprintf(stderr, "usage:\n");
fprintf(stderr, " %s on ....... turn on LED\n", name);
fprintf(stderr, " %s off ...... turn off LED\n", name);
fprintf(stderr, " %s status ... ask current status of LED\n", name);
#if ENABLE_TEST
fprintf(stderr, " %s test ..... run driver reliability test\n", name);
#endif /* ENABLE_TEST */
}
int main(int argc, char **argv)
{
usb_dev_handle *handle = NULL;
const unsigned char rawVid[2] = {USB_CFG_VENDOR_ID}, rawPid[2] = {USB_CFG_DEVICE_ID};
char vendor[] = {USB_CFG_VENDOR_NAME, 0}, product[] = {USB_CFG_DEVICE_NAME, 0};
char buffer[4];
int cnt, vid, pid, isOn;
buffer[0] = 0;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
usb_init();
if(argc < 2){ /* we need at least one argument */
usage(argv[0]);
exit(1);
}
/* compute VID/PID from usbconfig.h so that there is a central source of information */
vid = rawVid[1] * 256 + rawVid[0];
pid = rawPid[1] * 256 + rawPid[0];
/* The following function is in opendevice.c: */
if(usbOpenDevice(&handle, vid, vendor, pid, product, NULL, NULL, NULL) != 0){
fprintf(stderr, "Could not find USB device \"%s\" with vid=0x%x pid=0x%x\n", product, vid, pid);
exit(1);
}
/* Since we use only control endpoint 0, we don't need to choose a
* configuration and interface. Reading device descriptor and setting a
* configuration and interface is done through endpoint 0 after all.
* However, newer versions of Linux require that we claim an interface
* even for endpoint 0. Enable the following code if your operating system
* needs it: */
#if 0
int retries = 1, usbConfiguration = 1, usbInterface = 0;
if(usb_set_configuration(handle, usbConfiguration) && showWarnings){
fprintf(stderr, "Warning: could not set configuration: %s\n", usb_strerror());
}
/* now try to claim the interface and detach the kernel HID driver on
* Linux and other operating systems which support the call. */
while((len = usb_claim_interface(handle, usbInterface)) != 0 && retries-- > 0){
#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP
if(usb_detach_kernel_driver_np(handle, 0) < 0 && showWarnings){
fprintf(stderr, "Warning: could not detach kernel driver: %s\n", usb_strerror());
}
#endif
}
#endif
//if(strcasecmp(argv[1], "status") == 0){
if(_stricmp(argv[1], "status") == 0){
cnt = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, CUSTOM_RQ_GET_STATUS, 0, 0, buffer, sizeof(buffer), 5000);
if(cnt < 1){
if(cnt < 0){
fprintf(stderr, "USB error: %s\n", usb_strerror());
}else{
fprintf(stderr, "only %d bytes received.\n", cnt);
}
}else{
printf("LED is %s\n", buffer[0] ? "on" : "off");
}
}else if(_stricmp(argv[1], "poti") == 0){
cnt = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, 3, 0, 0, buffer, sizeof(buffer), 5000);
if(cnt < 1){
if(cnt < 0){
fprintf(stderr, "USB error: %s\n", usb_strerror());
}else{
fprintf(stderr, "only %d bytes received.\n", cnt);
}
}else{
printf("LED is %d %d %d\n", buffer[0],buffer[1],buffer[2]);
}
// }else if((isOn = (strcasecmp(argv[1], "on") == 0)) || strcasecmp(argv[1], "off") == 0){
}else if((isOn = (_stricmp(argv[1], "on") == 0)) || _stricmp(argv[1], "off") == 0){
cnt = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_OUT, CUSTOM_RQ_SET_STATUS, isOn, 0, buffer, 0, 5000);
if(cnt < 0){
fprintf(stderr, "USB error: %s\n", usb_strerror());
}
#if ENABLE_TEST
}else if(strcasecmp(argv[1], "test") == 0){
int i;
srandomdev();
for(i = 0; i < 50000; i++){
int value = random() & 0xffff, index = random() & 0xffff;
int rxValue, rxIndex;
if((i+1) % 100 == 0){
fprintf(stderr, "\r%05d", i+1);
fflush(stderr);
}
cnt = usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, CUSTOM_RQ_ECHO, value, index, buffer, sizeof(buffer), 5000);
if(cnt < 0){
fprintf(stderr, "\nUSB error in iteration %d: %s\n", i, usb_strerror());
break;
}else if(cnt != 4){
fprintf(stderr, "\nerror in iteration %d: %d bytes received instead of 4\n", i, cnt);
break;
}
rxValue = ((int)buffer[0] & 0xff) | (((int)buffer[1] & 0xff) << 8);
rxIndex = ((int)buffer[2] & 0xff) | (((int)buffer[3] & 0xff) << 8);
if(rxValue != value || rxIndex != index){
fprintf(stderr, "\ndata error in iteration %d:\n", i);
fprintf(stderr, "rxValue = 0x%04x value = 0x%04x\n", rxValue, value);
fprintf(stderr, "rxIndex = 0x%04x index = 0x%04x\n", rxIndex, index);
}
}
fprintf(stderr, "\nTest completed.\n");
#endif /* ENABLE_TEST */
}else{
usage(argv[0]);
exit(1);
}
usb_close(handle);
return 0;
}
