#include <stdio.h>
#include <libusb-
1.0/libusb.h>
#include <stdint.h>
#include <
string.h>
void processMessage(
const uint8_t*
);
/*----------------------------------------------------------------------*/
int main(
int argc,
char*
argv[])
{
int res =
0;
/* return codes from libusb functions */
libusb_device_handle* handle =
0;
/* handle for USB device */
int kernelDriverDetached =
0;
/* Set to 1 if kernel driver detached */
int numBytes =
0;
/* Actual bytes transferred. */
uint8_t buffer[64];
/* 64 byte transfer buffer */
/* Initialise libusb. */
res = libusb_init(
0);
if (res !=
0)
{
fprintf(stderr, "Error initialising libusb.\n");
return 1;
}
/* Get the first device with the matching Vendor ID and Product ID. If
* intending to allow multiple demo boards to be connected at once, you
* will need to use libusb_get_device_list() instead. Refer to the libusb
* documentation for details. */
handle = libusb_open_device_with_vid_pid(
0,
0x04d8,
0x0070);
if (!
handle)
{
fprintf(stderr, "Unable to open device.\n");
return 1;
}
/* Check whether a kernel driver is attached to interface #0. If so, we'll
* need to detach it.
*/
if (libusb_kernel_driver_active(handle,
0))
{
res = libusb_detach_kernel_driver(handle,
0);
if (res ==
0)
{
kernelDriverDetached =
1;
}
else
{
fprintf(stderr, "Error detaching kernel driver.\n");
return 1;
}
}
/* Claim interface #0. */
res = libusb_claim_interface(handle,
0);
if (res !=
0)
{
fprintf(stderr, "Error claiming interface.\n");
return 1;
}
/* We can now send and receive messages. For example, set normal mode. */
memset(buffer, 0,
64);
buffer[58] =
0;
/* CANCTRL = Normal mode. */
buffer[60] =
0x02;
/* SPI command = Write. */
buffer[61] =
0x0f;
/* Register = CANCTRL */
buffer[62] =
0;
/* Data = 0 (normal mode) */
/* Send the message to endpoint 1 with a 100ms timeout. */
res = libusb_interrupt_transfer(handle,
1, buffer,
64, &numBytes,
100);
if (res ==
0)
{
printf("%d bytes transmitted successfully.\n", numBytes);
}
else
{
fprintf(stderr, "Error sending message to device.\n");
}
/* Listen for a message. Note that for a normal application you'll need
* to use asynchronous mode because we can't predict when messages will be
* available. This involves setting up a callback function to handle incoming
* messages - refer to libusb documentation. */
/* Wait up to 5 seconds for a message to arrive on endpoint 0x81. */
res = libusb_interrupt_transfer(handle,
0x81, buffer,
64, &numBytes,
5000);
if (
0 ==
res)
{
if (numBytes ==
64)
{
processMessage(buffer);
}
else
{
printf("Received %d bytes, expected 64.\n", numBytes);
}
}
else
{
fprintf(stderr, "Error receiving message.\n");
}
/* Release interface #0. */
res = libusb_release_interface(handle,
0);
if (
0 !=
res)
{
fprintf(stderr, "Error releasing interface.\n");
}
/* If we detached a kernel driver from interface #0 earlier, we'll now
* need to attach it again. */
if (kernelDriverDetached)
{
libusb_attach_kernel_driver(handle, 0);
}
/* Shutdown libusb. */
libusb_exit(0);
return 0;
}
/*----------------------------------------------------------------------*/
void processMessage(
const uint8_t*
buffer)
{
unsigned index =
0;
/* Most significant bit set indicates a CAN message is present. */
while(buffer[index] &
0x80)
{
unsigned extendedID = buffer[index] &
0x20;
unsigned rtr = buffer[index] &
0x10;
unsigned dataLength = buffer[index] &
0x0f;
unsigned canID =
0;
++
index;
if (extendedID)
/* 29 bit identifier */
{
canID = buffer[index] <<
21;
++
index;
canID |= (((buffer[index] &
0xe0 >>
5) |
(buffer[index] &
0x03)) <<
16);
++
index;
canID |= (buffer[index] <<
8);
++
index;
canID |=
(buffer[index]);
++
index;
}
else /* standard 11 bit identifier */
{
canID = buffer[index] <<
3;
++
index;
canID |= ((buffer[index] >>
1) &
7);
++
index;
}
printf("CAN ID: 0x%x [%s] ", canID,
extendedID ?
"extended" :
"standard");
if (rtr)
{
printf("RTR\n");
}
else
{
unsigned i =
0;
for (i =
0; i < dataLength; ++
i)
{
printf("0xx ", buffer[index]);
++
index;
}
printf("\n");
}
}
printf("CAN Status: 0xx\n", buffer[
57]);
printf("Transmit Errors: %u\n", buffer[
55]);
printf("Receive Errors: %u\n", buffer[
56]);
/* If the command was read, we have received the result. */
if (buffer[
60] ==
0x03)
{
printf("Read from register 0xx returned 0xx\n",
buffer[61], buffer[
62]);
}
}
View Code
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <
string.h>
#include </usr/local/include/libusb-
1.0/libusb.h>
#define BULK_EP_OUT 0x82
#define BULK_EP_IN 0x08
int interface_ref =
0;
int alt_interface,interface_number;
int print_configuration(
struct libusb_device_handle *hDevice,
struct libusb_config_descriptor *
config)
{
char *
data;
int index;
data = (
char *)
malloc(
512);
memset(data,0,
512);
index = config->
iConfiguration;
libusb_get_string_descriptor_ascii(hDevice,index,data,512);
printf("\nInterface Descriptors: ");
printf("\n\tNumber of Interfaces : %d",config->
bNumInterfaces);
printf("\n\tLength : %d",config->
bLength);
printf("\n\tDesc_Type : %d",config->
bDescriptorType);
printf("\n\tConfig_index : %d",config->
iConfiguration);
printf("\n\tTotal length : %lu",config->
wTotalLength);
printf("\n\tConfiguration Value : %d",config->
bConfigurationValue);
printf("\n\tConfiguration Attributes : %d",config->
bmAttributes);
printf("\n\tMaxPower(mA) : %d\n",config->
MaxPower);
free(data);
data =
NULL;
return 0;
}
struct libusb_endpoint_descriptor* active_config(
struct libusb_device *dev,
struct libusb_device_handle *
handle)
{
struct libusb_device_handle *
hDevice_req;
struct libusb_config_descriptor *
config;
struct libusb_endpoint_descriptor *
endpoint;
int altsetting_index,interface_index=
0,ret_active;
int i,ret_print;
hDevice_req =
handle;
ret_active = libusb_get_active_config_descriptor(dev,&
config);
ret_print =
print_configuration(hDevice_req,config);
for(interface_index=
0;interface_index<config->bNumInterfaces;interface_index++
)
{
const struct libusb_interface *iface = &config->
interface[interface_index];
for(altsetting_index=
0;altsetting_index<iface->num_altsetting;altsetting_index++
)
{
const struct libusb_interface_descriptor *altsetting = &iface->
altsetting[altsetting_index];
int endpoint_index;
for(endpoint_index=
0;endpoint_index<altsetting->bNumEndpoints;endpoint_index++
)
{
const struct libusb_endpoint_desriptor *ep = &altsetting->
endpoint[endpoint_index];
endpoint =
ep;
alt_interface = altsetting->
bAlternateSetting;
interface_number = altsetting->
bInterfaceNumber;
}
printf("\nEndPoint Descriptors: ");
printf("\n\tSize of EndPoint Descriptor : %d",endpoint->
bLength);
printf("\n\tType of Descriptor : %d",endpoint->
bDescriptorType);
printf("\n\tEndpoint Address : 0x0%x",endpoint->
bEndpointAddress);
printf("\n\tMaximum Packet Size: %x",endpoint->
wMaxPacketSize);
printf("\n\tAttributes applied to Endpoint: %d",endpoint->
bmAttributes);
printf("\n\tInterval for Polling for data Tranfer : %d\n",endpoint->
bInterval);
}
}
libusb_free_config_descriptor(NULL);
return endpoint;
}
int main(
void)
{
int r =
1;
struct libusb_device **
devs;
struct libusb_device_handle *handle = NULL, *hDevice_expected =
NULL;
struct libusb_device *dev,*
dev_expected;
struct libusb_device_descriptor desc;
struct libusb_endpoint_descriptor *
epdesc;
struct libusb_interface_descriptor *
intdesc;
ssize_t cnt;
int e =
0,config2;
int i =
0,index;
char str1[
64], str2[
64];
char found =
0;
// Init libusb
r =
libusb_init(NULL);
if(r <
0)
{
printf("\nfailed to initialise libusb\n");
return 1;
}
else
printf("\nInit Successful!\n");
// Get a list os USB devices
cnt = libusb_get_device_list(NULL, &
devs);
if (cnt <
0)
{
printf("\nThere are no USB devices on bus\n");
return -
1;
}
printf("\nDevice Count : %d\n-------------------------------\n",cnt);
while ((dev = devs[i++]) !=
NULL)
{
r = libusb_get_device_descriptor(dev, &
desc);
if (r <
0)
{
printf("failed to get device descriptor\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
break;
}
e = libusb_open(dev,&
handle);
if (e <
0)
{
printf("error opening device\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
break;
}
printf("\nDevice Descriptors: ");
printf("\n\tVendor ID : %x",desc.idVendor);
printf("\n\tProduct ID : %x",desc.idProduct);
printf("\n\tSerial Number : %x",desc.iSerialNumber);
printf("\n\tSize of Device Descriptor : %d",desc.bLength);
printf("\n\tType of Descriptor : %d",desc.bDescriptorType);
printf("\n\tUSB Specification Release Number : %d",desc.bcdUSB);
printf("\n\tDevice Release Number : %d",desc.bcdDevice);
printf("\n\tDevice Class : %d",desc.bDeviceClass);
printf("\n\tDevice Sub-Class : %d",desc.bDeviceSubClass);
printf("\n\tDevice Protocol : %d",desc.bDeviceProtocol);
printf("\n\tMax. Packet Size : %d",desc.bMaxPacketSize0);
printf("\n\tNo. of Configuraions : %d\n",desc.bNumConfigurations);
e = libusb_get_string_descriptor_ascii(handle, desc.iManufacturer, (unsigned
char*) str1,
sizeof(str1));
if (e <
0)
{
libusb_free_device_list(devs,1);
libusb_close(handle);
break;
}
printf("\nManufactured : %s",str1);
e = libusb_get_string_descriptor_ascii(handle, desc.iProduct, (unsigned
char*) str2,
sizeof(str2));
if(e <
0)
{
libusb_free_device_list(devs,1);
libusb_close(handle);
break;
}
printf("\nProduct : %s",str2);
printf("\n----------------------------------------");
if(desc.idVendor ==
0xffff && desc.idProduct ==
0x4)
{
found =
1;
break;
}
}//end of while
if(found ==
0)
{
printf("\nDevice NOT found\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
return 1;
}
else
{
printf("\nDevice found");
dev_expected =
dev;
hDevice_expected =
handle;
}
e = libusb_get_configuration(handle,&
config2);
if(e!=
0)
{
printf("\n***Error in libusb_get_configuration\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
return -
1;
}
printf("\nConfigured value : %d",config2);
if(config2 !=
1)
{
libusb_set_configuration(handle, 1);
if(e!=
0)
{
printf("Error in libusb_set_configuration\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
return -
1;
}
else
printf("\nDevice is in configured state!");
}
libusb_free_device_list(devs, 1);
if(libusb_kernel_driver_active(handle,
0) ==
1)
{
printf("\nKernel Driver Active");
if(libusb_detach_kernel_driver(handle,
0) ==
0)
printf("\nKernel Driver Detached!");
else
{
printf("\nCouldn't detach kernel driver!\n");
libusb_free_device_list(devs,1);
libusb_close(handle);
return -
1;
}
}
e = libusb_claim_interface(handle,
0);
if(e <
0)
{
printf("\nCannot Claim Interface");
libusb_free_device_list(devs,1);
libusb_close(handle);
return -
1;
}
else
printf("\nClaimed Interface\n");
active_config(dev_expected,hDevice_expected);
// Communicate
char *my_string, *
my_string1;
int transferred =
0;
int received =
0;
int length =
0;
my_string = (
char *)
malloc(nbytes +
1);
my_string1 = (
char *)
malloc(nbytes +
1);
memset(my_string,'\0',
64);
memset(my_string1,'\0',
64);
strcpy(my_string,"prasad divesd");
length =
strlen(my_string);
printf("\nTo be sent : %s",my_string);
e = libusb_bulk_transfer(handle,BULK_EP_IN,my_string,length,&transferred,
0);
if(e ==
0 && transferred ==
length)
{
printf("\nWrite successful!");
printf("\nSent %d bytes with string: %s\n", transferred, my_string);
}
else
printf("\nError in write! e = %d and transferred = %d\n",e,transferred);
sleep(3);
i =
0;
for(i =
0; i < length; i++
)
{
e = libusb_bulk_transfer(handle,BULK_EP_OUT,my_string1,
64,&received,
0);
//64 : Max Packet Lenght
if(e ==
0)
{
printf("\nReceived: ");
printf("%c",my_string1[i]);
//will read a string from lcp2148
sleep(
1);
}
else
{
printf("\nError in read! e = %d and received = %d\n",e,received);
return -
1;
}
}
e = libusb_release_interface(handle,
0);
libusb_close(handle);
libusb_exit(NULL);
printf("\n");
return 0;
}
View Code
转载于:https://www.cnblogs.com/nightnine/p/7355290.html
