[英]Libusb - ubuntu - Psoc5. libusb_open_device_with_vid_pid return 0
我在第四學期從事一個動力工程項目,而編程不是我的強項。 我一直在使用libusb在PSoC 5和用C ++編寫的Linux終端程序之間進行通信。 終端代碼為:
問題是,即使Linux OS識別了該設備, libusb_open_device_with_vid_pid(NULL, 0x1111, 0x2222)
每次libusb_open_device_with_vid_pid(NULL, 0x1111, 0x2222)
返回0。 如果相關的話,操作系統是Ubuntu 。
#include <iostream>
#include "libusb-1.0/libusb.h"
#include "usb.h"
#include <time.h>
using namespace std;
union USB_DATA
{
unsigned char USB_ARRAY[1200];
int DirectionOfPower;
int menu;
float Voltage;
float Current;
float Temperature;
float PowerFactor;
float DistortionPowerFactor;
float Amplitude_Of_Harmonics[1001];
float Regulate_To;
};
union USB_DATA USB_;
/*
void error(string s, int err)
{
cout << s " ERROR: " << libusb_error_name(err) << endl;
exit(err);
}
*/
int main()
{
int transfer_size;
int err;
float Reg_To;
// Device Handle
libusb_device_handle* dev;
// Initialize libusb with default context
libusb_init(NULL);
// Open Device VID = 0x1111, PID = 0x2222 with the default libusb context
dev = libusb_open_device_with_vid_pid( NULL, 0x1111, 0x2222 );
// If device is null, we didn't find it
/*
if (dev == NULL)
{
cout << "Device not found, exiting." << endl;
return -1;
}
int k = 0;
while (dev == NULL)
{
cout << "Device not found, trying again." << " " << k << endl;
//sleep(1);
k = k+1;
}
*/
// Claim interface 0 on the device. Here we te the operation system that wewan this device
libusb_claim_interface(dev, 0);
libusb_detach_kernel_driver(dev, 0);
// Set alternate setting 0 on interface 0
libusb_set_interface_alt_setting(dev, 0, 0);
while(true)
{
cout << "Welcome to Spaendingsregulering!" << endl;
cout << endl;
cout << "MENU" << endl;
cout << "Indtast nummer for navigation" << endl;
cout << "1. Indsaet driftsparametre " << endl;
cout << "2. Analyser harmoniske " << endl;
cout << "3. Fremvis data " << endl;
while(true)
{
cin >> USB_.menu;
if(cin.good())
break;
cin.clear();
}
/*
err = libusb_bulk_transfer(dev, 0x02, USB_.USB_ARRAY, sizeof(union USB_), &transfer_size, 1000);
if( err )
error( "Bulk OUT Transfer Failed!", err);
err = libusb_bulk_transfer(dev, 0x81, USB_.USB_ARRAY, sizeof(union USB_), &transfer_size, 1000);
if( err )
error( "Bulk IN Transfer Failed!", err);
*/
if(USB_.menu == 1)
while(true)
{
cout << "Indsaet oensket spaending" << endl;
cout << "Indtast 999 for at vende tilbage til hovedmenuen" << endl;
cin >> Reg_To;
cout << endl;
if(Reg_To == 999)
{
break;
}
USB_.Regulate_To = Reg_To;
cout << "=======================" << endl;
cout << "Saetter oensket spaending til:" << " " << USB_.Regulate_To << "V" << endl;
cout << "=======================" << endl;
cout << endl;
cout << "Vender tilbage til hovedmenu" << endl;
cout << "..." << endl;
cout << endl;
if(cin.good())
break;
cin.clear();
}
}
}
libusb_open_device_with_vid_pid
結合了查找和打開功能,並且不返回錯誤代碼。 如果您確定設備在那兒,是否檢查過您有權對其進行讀寫? 您還可以增加錯誤消息的詳細程度 。 –蕾亞茲
謝謝! 做到了! 我忘了使用sudo ..菜鳥錯誤–ÇağrıEsen
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.