की कोशिश की नीचे दिए गए कोड का प्रयास करें और यह LPC2148 पर काम करना चाहिए। मैंने इसे एक एलपीसी 2148 के साथ परीक्षण किया है जो लिखने के बाद यूएसबी से इंटरप्ट प्राप्त करने के लिए कॉन्फ़िगर किया गया है (उपयोगकर्ता-स्थान से) और आरटीसी चलना शुरू हो जाता है।
आपके प्रश्न का उत्तर दें कि इसमें पढ़ा/लिखने या नहीं, जहां तक मैंने अध्ययन किया है, आपको कर्नेल ड्राइवर को शामिल करना है, आपको कर्नेल ड्राइवर को अलग करना होगा और libusb API का उपयोग करके इंटरफ़ेस का दावा करना होगा। हालांकि मुझे यकीन नहीं है कि इसे अलग किए बिना किया जा सकता है या नहीं।
#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;
}
आपने यह नहीं कहा कि आप किस ओएस का उपयोग करते हैं! –