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各位大佬，
在下需要使用RK1808 进行USB 2.0 高速模式的 BULK方式同PC进行USB收发数据，经过了解，使用现有的库LIBUSB，可以简化USB开发，但在使用LIBUSB时，发现LIBUSB可以打开端口，读取描述符，但是无法发送、接收数据，当时RK1808配置为ADB模式，PC端为HOST端
这为检测到USB接口
bus: 002 device: 001, VID: 1d6b PID: 0001, Generic Platform OHCI controller
bus: 001 device: 002, VID: 05e3 PID: 0608, USB2.0 Hub
bus: 001 device: 001, VID: 1d6b PID: 0002, EHCI Host Controller
LIBUSB选定了这个接口，VID:0x1d6b PID:0x0001
LIBUSB读取的设备描述符是：
Device descriptor:
bDescriptorType: 1
bcdUSB: 0x0110
bDeviceClass: 9
bDeviceSubClass: 0
bDeviceProtocol: 0
bMaxPacketSize0: 64
idVendor: 0x1d6b
idProduct: 0x0001
bNumConfigurations: 1
Configuration descriptor:
wTotalLength: 25
bNumInterfaces: 1
bConfigurationValue: 1
iConfiguration: 0
bmAttributes: e0h
MaxPower: 0
Interface descriptor:
bInterfaceNumber: 0
bAlternateSetting: 0
bNumEndpoints: 1
bInterfaceClass: 9
bInterfaceSubClass: 0
bInterfaceProtocol: 0
iInterface: 0
Endpoint descriptor:
bEndpointAddress: 81h
bmAttributes: 03h
wMaxPacketSize: 2
bInterval: 255
bRefresh: 0
bSynchAddress: 0
测试代码如下：
#include <unistd.h>
#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <signal.h>
#include <semaphore.h>
#include <libusb.h>
typedef unsigned char uchar;
typedef unsigned int uint;
#define VID 0x1d6b
#define PID 0x0001
#define BULK_RECV_EP 0x81
#define BULK_SEND_EP 0x01
//#define INT_RECV_EP 0x81
//#define INT_SEND_EP 0x01
#define SEND_BUFF_LEN 500
#define RECV_BUFF_LEN 500
#define BULK_TEST 1
#define INT_TEST 2
#define SAVE_FILE_PATH "libusb_test_recv_data"
sem_t print_sem; //信号量
FILE *g_file_stream = NULL;
int g_no_device_flag = 0;
int g_file_save_en = 0; //文件保存使能标志
int g_send_flag = 0; //调用数据发送函数标志
uchar rev_buf[SEND_BUFF_LEN]; //usb 接收缓冲区
uchar send_buf[SEND_BUFF_LEN]="test100"; //usb发送缓冲区
libusb_device_handle *dev_handle;
char test_bytes[] =
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"
"abcdefghijklmnopqrstuvwxyz0123456789\n"; //37*15=555 bytes
int bulk_send(char *buf, int num);
//int interrupt_send(char *buf, int num);
void *bulk_rev_thread(void *arg);
//void *interrupt_rev_thread(void *arg);
int LIBUSB_CALL usb_event_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data);
void help(void);
int str2hex(char *hex);
void hex2str(uchar *pbDest, uchar *pbSrc, ushort nLen);
void *usb_monitor_thread(void *arg);
int save_to_file(FILE *file_stream, uchar *data, int length);
void print_devs(libusb_device **devs);
int list_devices(void);
void print_endpoint(const struct libusb_endpoint_descriptor *endpoint);
void print_altsetting(const struct libusb_interface_descriptor *interface);
void print_interface(const struct libusb_interface *interface);
void print_configuration(struct libusb_config_descriptor *config);
void print_device(libusb_device *dev, struct libusb_device_descriptor *desc);
int print_descriptor(libusb_device *dev);
int get_descriptor_with_vid_pid(int vid, int pid);
void sigint_handler(int sig);
//采用bulk端点发送数据
int bulk_send(char *buf, int num)
{
int size;
int rec;
g_send_flag = 1;
rec = libusb_bulk_transfer(dev_handle, BULK_SEND_EP, buf, num, &size, 0);
if(rec == 0) {
printf("bulk send sucess,length: %d bytes\n", size);
sem_post(&print_sem);
}
else{
g_send_flag = 0;
printf("bulk send faild, err: %s\n", libusb_error_name(rec));
}
return 0;
}
/*
//采用interrupt端点发送数据
int interrupt_send(char *buf, int num)
{
int size;
int rec;
g_send_flag = 1;
rec = libusb_interrupt_transfer(dev_handle, INT_SEND_EP, buf, num, &size, 0);
if(rec == 0) {
printf("interrupt send sucess, length: %d bytes\n", size);
sem_post(&print_sem);
}
else{
g_send_flag = 0;
printf("interrupt send faild, err: %s\n", libusb_error_name(rec));
}
return 0;
}
*/
//bulk 端点接收线程
void *bulk_rev_thread(void *arg)
{
int i=0;
int size;
int rec;
int save_bytes;
unsigned char hex_buf[RECV_BUFF_LEN*5];
printf("bulk_rev_thread started.\n");
while(1)
{
if(g_no_device_flag){
usleep(50 * 1000);
continue;
}
memset(rev_buf, 0, RECV_BUFF_LEN);
rec = libusb_bulk_transfer(dev_handle, BULK_RECV_EP, rev_buf, RECV_BUFF_LEN, &size, 0);
if(rec == 0)
{
if(g_send_flag == 1) //考虑如果没有调用发送数据函数，接收到数据后调用sem_wait会一直等待直到调用了bulk_send，才会继续往下执行
{
g_send_flag = 0;
sem_wait(&print_sem);
}
printf("\nbulk ep rev sucess, length: %d bytes. \n", size);
if(g_file_save_en){
save_bytes = save_to_file(g_file_stream, rev_buf, size);
printf("save %d bytes to file.\n", save_bytes);
}
hex2str(hex_buf, rev_buf, size);
printf("data is: \n%s\n", rev_buf);
printf("hex is: \n%s\n", hex_buf);
}
else
{
printf("bulk ep rev faild, err: %s\n", libusb_error_name(rec));
if(rec == LIBUSB_ERROR_IO)
g_no_device_flag = 1; //防止一直输出err
}
}
}
/*
//interrupt 端点接收线程
void *interrupt_rev_thread(void *arg)
{
int i=0;
int size;
int rec;
int save_bytes;
unsigned char hex_buf[RECV_BUFF_LEN*5];
printf("interrupt_rev_thread started.\n");
while(1)
{
if(g_no_device_flag){
usleep(50 * 1000);
continue;
}
memset(rev_buf, 0, RECV_BUFF_LEN);
rec = libusb_interrupt_transfer(dev_handle, INT_RECV_EP, rev_buf, RECV_BUFF_LEN, &size, 0);
if(rec == 0)
{
if(g_send_flag == 1) //考虑如果没有调用发送数据函数，接收到数据后调用sem_wait会一直等待直到调用了interrupt_send，才会继续往下执行
{
g_send_flag = 0;
sem_wait(&print_sem);
}
printf("\ninterrupt ep rev sucess, length: %d bytes. \n", size);
if(g_file_save_en){
save_bytes = save_to_file(g_file_stream, rev_buf, size);
printf("save %d bytes to file.\n", save_bytes);
}
hex2str(hex_buf, rev_buf, size);
printf("data is: \n%s\n", rev_buf);
printf("hex is: \n%s\n", hex_buf);
}
else
{
printf("interrupt ep rev faild, err: %s\n", libusb_error_name(rec));
if(rec == LIBUSB_ERROR_IO)
g_no_device_flag = 1; //防止一直输出err
}
}
}
*/
//usb hotplugin callback function
int LIBUSB_CALL usb_event_callback(libusb_context *ctx, libusb_device *dev, libusb_hotplug_event event, void *user_data)
{
struct libusb_device_descriptor desc;
int r;
printf("\nusb hotplugin event.\n");
r = libusb_get_device_descriptor(dev, &desc);
if (LIBUSB_SUCCESS != r) {
printf("error getting device descriptor.\n");
}
if (LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED == event) {
printf("usb device attached: %04x:%04x\n", desc.idVendor, desc.idProduct);
if (dev_handle) {
libusb_close(dev_handle);
dev_handle = NULL;
}
r = libusb_open(dev, &dev_handle);
if (LIBUSB_SUCCESS != r) {
printf ("error opening device.\n");
}
else {
if(libusb_kernel_driver_active(dev_handle, 0) == 1) { //find out if kernel driver is attached
printf("kernel driver active\n");
if(libusb_detach_kernel_driver(dev_handle, 0) == 0) //detach it
printf("kernel driver detach\n");
}
int r = libusb_claim_interface(dev_handle, 0); //claim interface 0 (the first) of device (mine had jsut 1)
if (r < 0) {
printf("libusb_claim_interface failed\n");
return 0;
}
g_no_device_flag = 0;
printf("usb device open sucess\n\n");
printf("input data to send or command:");
fflush(stdout);
}
}
else if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
g_no_device_flag = 1;
printf("usb device removed: %04x:%04x\n", desc.idVendor, desc.idProduct);
if (dev_handle) {
libusb_close(dev_handle);
dev_handle = NULL;
}
}
else
;
return 0;
}
//usb hotplugin monitor thread
void * usb_monitor_thread(void *arg)
{
printf("usb monitor thread started.\n");
int r = 0;
while (1) {
r = libusb_handle_events(NULL);
if (r < 0)
printf("libusb_handle_events() failed: %s\n", libusb_error_name(r));
}
}
void help(void)
{
printf("usage: libusb-test [-h] [-b] [-i] [-v vid] [-p pid] [-ffile_path] [-l] [-a] \n");
printf(" -h : display usage\n");
printf(" -b : test bulk transfer\n");
printf(" -i : test interrupt transfer\n");
printf(" -v : usb VID\n");
printf(" -p : usb PID\n");
printf(" -f : file path to save data\n");
printf(" -l : list usb devices\n");
printf(" -a : print descriptor for the usb(VID ID)\n");
return;
}
//将char类型（0-255）的buf转换成以十六进制显示的字符串。
//使用这个函数可以避免多次循环调用printf("%x", buf[i]); 提高效率，并且能避免线程切换造成输出乱序的问题。
//buf={'1', '2', '3', 'a', 'b', 'c'} -> "0x31 0x32 0x33 0x61 0x62 0x63"
//buf={0,1,2,3} -> "0x00 0x01 0x02 0x03"
void hex2str(uchar *dest, uchar *src, ushort nLen)
{
int i;
for (i=0; i<nLen; i++)
{
sprintf(dest+5*i, "%#04x ", src[i]); //string类函数，不会造成线程切换
}
dest[nLen*5] = '\0';
}
//十六进制数字字符串转数字（十六进制）
// "0x1234" -> 0x1234 or "1234" -> 0x1234
int str2hex(char *hex)
{
int sum = 0;
int tmp = 0;
char hex_str[5];
if(strlen(hex) == 6) //0x1234
memcpy(hex_str, &hex[2], 4);
else
memcpy(hex_str, hex, 4);
/*
for(int i = 0; i < 4; i++)
{
tmp = hex_str[i] - (((hex_str[i] >= '0') && (hex_str[i] <= '9')) ? '0' : \
((hex_str[i] >= 'A') && (hex_str[i] <= 'Z')) ? 'A' - 10 : 'a' - 10);
sum += tmp * pow(16, 3-i);
}*/
return sum;
}
//将接收到数据保存到文件中
int save_to_file(FILE *file_stream, uchar *data, int length)
{
int write_num;
write_num = fwrite(data, 1, length, file_stream);
fputc('\n', file_stream); //为每段数据换行，方便查看
fflush(file_stream);
return write_num;
}
void print_devs(libusb_device **devs)
{
libusb_device *dev;
int i = 0, j = 0;
uint8_t path[8];
libusb_device_handle *handle = NULL;
unsigned char string[256];
while ((dev = devs[i++]) != NULL) {
struct libusb_device_descriptor desc;
int r = libusb_get_device_descriptor(dev, &desc);
if (r < 0) {
printf("failed to get device descriptor\n");
return;
}
printf("bus: %03d device: %03d, VID: %04x PID: %04x",
libusb_get_bus_number(dev), libusb_get_device_address(dev), desc.idVendor, desc.idProduct);
int ret = libusb_open(dev, &handle);
if (LIBUSB_SUCCESS == ret) {
if (desc.iProduct) {
ret = libusb_get_string_descriptor_ascii(handle, desc.iProduct, string, sizeof(string)); //显示产品信息
if (ret > 0)
printf(", %s", string);
}
}
printf("\n");
if (handle)
libusb_close(handle);
}
}
//列出系统所有的USB设备.
//包括：bus number. device number, vid, pid, product info
int list_devices(void)
{
libusb_device **devs;
int r;
ssize_t cnt;
r = libusb_init(NULL);
if (r < 0)
return r;
cnt = libusb_get_device_list(NULL, &devs);
if (cnt < 0)
return (int) cnt;
print_devs(devs);
libusb_free_device_list(devs, 1);
libusb_exit(NULL);
return 0;
}
void print_endpoint(const struct libusb_endpoint_descriptor *endpoint)
{
int i, ret;
printf(" Endpoint descriptor:\n");
printf(" bEndpointAddress: %02xh\n", endpoint->bEndpointAddress);
printf(" bmAttributes: %02xh\n", endpoint->bmAttributes);
printf(" wMaxPacketSize: %d\n", endpoint->wMaxPacketSize);
printf(" bInterval: %d\n", endpoint->bInterval);
printf(" bRefresh: %d\n", endpoint->bRefresh);
printf(" bSynchAddress: %d\n", endpoint->bSynchAddress);
}
void print_altsetting(const struct libusb_interface_descriptor *interface)
{
int i;
printf(" Interface descriptor:\n");
printf(" bInterfaceNumber: %d\n", interface->bInterfaceNumber);
printf(" bAlternateSetting: %d\n", interface->bAlternateSetting);
printf(" bNumEndpoints: %d\n", interface->bNumEndpoints);
printf(" bInterfaceClass: %d\n", interface->bInterfaceClass);
printf(" bInterfaceSubClass: %d\n", interface->bInterfaceSubClass);
printf(" bInterfaceProtocol: %d\n", interface->bInterfaceProtocol);
printf(" iInterface: %d\n", interface->iInterface);
for (i = 0; i < interface->bNumEndpoints; i++)
print_endpoint(&interface->endpoint[i]);
}
void print_interface(const struct libusb_interface *interface)
{
int i;
for (i = 0; i < interface->num_altsetting; i++)
print_altsetting(&interface->altsetting[i]);
}
void print_configuration(struct libusb_config_descriptor *config)
{
int i;
printf(" Configuration descriptor:\n");
printf(" wTotalLength: %d\n", config->wTotalLength);
printf(" bNumInterfaces: %d\n", config->bNumInterfaces);
printf(" bConfigurationValue: %d\n", config->bConfigurationValue);
printf(" iConfiguration: %d\n", config->iConfiguration);
printf(" bmAttributes: %02xh\n", config->bmAttributes);
printf(" MaxPower: %d\n", config->MaxPower);
for (i = 0; i < config->bNumInterfaces; i++)
print_interface(&config->interface[i]);
}
void print_device(libusb_device *dev, struct libusb_device_descriptor *desc)
{
int i;
printf("Device descriptor:\n");
printf(" bDescriptorType: %d\n", desc->bDescriptorType);
printf(" bcdUSB: %#06x\n", desc->bcdUSB);
printf(" bDeviceClass: %d\n", desc->bDeviceClass);
printf(" bDeviceSubClass: %d\n", desc->bDeviceSubClass);
printf(" bDeviceProtocol: %d\n", desc->bDeviceProtocol);
printf(" bMaxPacketSize0: %d\n", desc->bMaxPacketSize0);
printf(" idVendor: %#06x\n", desc->idVendor);
printf(" idProduct: %#06x\n", desc->idProduct);
printf(" bNumConfigurations: %d\n", desc->bNumConfigurations);
for (i = 0; i < desc->bNumConfigurations; i++) {
struct libusb_config_descriptor *config;
int ret = libusb_get_config_descriptor(dev, i, &config);
if (LIBUSB_SUCCESS != ret) {
printf("Couldn't retrieve descriptors\n");
continue;
}
print_configuration(config);
libusb_free_config_descriptor(config);
}
}
//打印USB设备的描述符
int print_descriptor(libusb_device *dev)
{
struct libusb_device_descriptor desc;
int ret, i;
ret = libusb_get_device_descriptor(dev, &desc);
if (ret < 0) {
printf("failed to get device descriptor\n");
return -1;
}
print_device(dev, &desc);
}
//根据VIDID，打印特定USB设备的描述符
int get_descriptor_with_vid_pid(int vid, int pid)
{
libusb_device **devs;
libusb_device *found = NULL;
libusb_device *dev;
ssize_t cnt;
int r, i;
r = libusb_init(NULL);
if (r < 0)
return -1;
cnt = libusb_get_device_list(NULL, &devs);
if (cnt < 0)
return -1;
while ((dev = devs[i++]) != NULL) {
struct libusb_device_descriptor desc;
r = libusb_get_device_descriptor(dev, &desc);
if (r < 0)
return -1;
if (desc.idVendor == vid && desc.idProduct == pid) {
found = dev;
break;
}
}
print_descriptor(found);
libusb_free_device_list(devs, 1);
libusb_exit(NULL);
return 0;
}
//ctrl+c 信号处理函数
void sigint_handler(int sig)
{
if(g_file_stream)
fclose(g_file_stream);
printf("\nlibusb test quit.\n");
exit(0);
}
int main(int argc, char **argv)
{
int r;
int opt;
int test_mode;
int vid, pid;
int send_length;
libusb_context *ctx = NULL;
struct sigaction act;
pthread_t bulk_rev_thread_id;
pthread_t int_rev_thread_id;
pthread_t usb_monitor_thread_id;
test_mode = BULK_TEST;
vid = VID;
pid = PID;
g_file_save_en = 0;
g_send_flag = 0;
act.sa_handler = sigint_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGINT, &act, NULL);
printf("\nlibusb test\n");
if(test_mode == BULK_TEST)
printf("test bulk transfer\n");
else if(test_mode == INT_TEST)
printf("test interrupt transfer\n");
else{
printf("unkonw test mode.\n");
return 0;
}
printf("usb device: VID:%#06x PID:%#06x\n\n", vid, pid); //#:输出0x，06:vid或pid第一个数字为0时，输出0x0471而不是0x471
list_devices();
get_descriptor_with_vid_pid(vid, pid);
r = sem_init(&print_sem, 0, 0); //初始化信号量，用于解决多线程下printf输出乱序的问题
if(r != 0)
perror("sem_init faild: ");
r = libusb_init(&ctx); //initialize the library for the session we just declared
if(r < 0) {
printf("libusb init faild, err:%s\n", libusb_error_name(r)); //there was an error
return -1;
}
libusb_set_debug(NULL, LIBUSB_LOG_LEVEL_DEBUG);
libusb_set_debug(ctx, LIBUSB_LOG_LEVEL_DEBUG);
if (!libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG)) {
printf("hotplug capabilites are not supported on this platform.\n");
libusb_exit (NULL);
return -1;
}
r = libusb_hotplug_register_callback(ctx, LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED | LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, LIBUSB_HOTPLUG_NO_FLAGS, vid, pid, LIBUSB_HOTPLUG_MATCH_ANY, usb_event_callback, NULL, NULL);
if (LIBUSB_SUCCESS != r) {
printf("error registering callback: %s\n", libusb_error_name(r));
libusb_exit(ctx);
return -1;
}
dev_handle = libusb_open_device_with_vid_pid(ctx, vid, pid); //open a usb device with VID& ID
if(dev_handle == NULL) {
printf("cannot open device\n");
return -1;
}
else
printf("usb device opened.\n");
r = libusb_kernel_driver_active(dev_handle, 0);
if(r == 0) //ok
;
else if(r == 1) {
printf("Kernel driver is active, now try detached\n");
if(libusb_detach_kernel_driver(dev_handle, 0) == 0) //detach it
printf("Kernel driver is detached!\n");
else{
printf("libusb_detach_kernel_driver, err:%s\n", libusb_error_name(r));
return -1;
}
}
else{
printf("libusb_kernel_driver_active, err:%s\n", libusb_error_name(r));
return -1;
}
r = libusb_claim_interface(dev_handle, 0); //claim interface 0 ,stm32采用接口0
if(r < 0) {
printf("cannot claim interface, err:%s\n", libusb_error_name(r));
return -1;
}
//热插拔监听
/* r = pthread_create(&usb_monitor_thread_id, 0, usb_monitor_thread, 0);
if(r != 0 )
{
perror("usb_monitor_thread creation faild\n");
} */
//new thread,usb rev data
if(test_mode == BULK_TEST){
r = pthread_create(&bulk_rev_thread_id, NULL, bulk_rev_thread, NULL);
if(r != 0 )
{
perror("thread creation faild\n");
}
}
// else if(test_mode == INT_TEST){
// r = pthread_create(&int_rev_thread_id, NULL, interrupt_rev_thread, NULL);
// if(r != 0 )
// {
// perror("thread creation faild\n");
// }
// }
while(1)
{
usleep(10 * 1000);
printf("\ninput data to send or command:");
//memset(send_buf, 0, SEND_BUFF_LEN);
// fgets((char)send_buf, SEND_BUFF_LEN, stdin);
send_length = strlen(send_buf)-1;
// send_buf[send_length] = '\0' ; //将读入的换行符转为\0
//用于快捷发送数据，如输入test64，会自动发送64字节数据，输入test100则会自动发送100字节数据
if(strncmp(send_buf, "test", 4) == 0){
send_length = atoi(&send_buf[4]);
if(send_length > strlen(test_bytes)){
printf("send_length:%d should less than max_length:%ld\n", send_length, strlen(test_bytes));
continue;
}
printf("test sending %d bytes.\n", send_length);
memcpy(send_buf, test_bytes, send_length);
}
if(test_mode == BULK_TEST)
bulk_send(send_buf, send_length);
//else if(test_mode == INT_TEST)
// interrupt_send(send_buf, send_length);
// else
// ;
}
}
libusb的运行日志如下，可以看到，端口打开正常，进行bulk通信时出错，
libusb test
test bulk transfer
usb device: VID:0x1d6b PID:0x0001
bus: 002 device: 001, VID: 1d6b PID: 0001, Generic Platform OHCI controller
bus: 001 device: 002, VID: 05e3 PID: 0608, USB2.0 Hub
bus: 001 device: 001, VID: 1d6b PID: 0002, EHCI Host Controller
Device descriptor:
bDescriptorType: 1
bcdUSB: 0x0110
bDeviceClass: 9
bDeviceSubClass: 0
bDeviceProtocol: 0
bMaxPacketSize0: 64
idVendor: 0x1d6b
idProduct: 0x0001
bNumConfigurations: 1
Configuration descriptor:
wTotalLength: 25
bNumInterfaces: 1
bConfigurationValue: 1
iConfiguration: 0
bmAttributes: e0h
MaxPower: 0
Interface descriptor:
bInterfaceNumber: 0
bAlternateSetting: 0
bNumEndpoints: 1
bInterfaceClass: 9
bInterfaceSubClass: 0
bInterfaceProtocol: 0
iInterface: 0
Endpoint descriptor:
bEndpointAddress: 81h
bmAttributes: 03h
wMaxPacketSize: 2
bInterval: 255
bRefresh: 0
bSynchAddress: 0
[timestamp] [threadID] facility level [function call] <message>
--------------------------------------------------------------------------------
[ 0.231831] [000002c9] libusb: debug [libusb_hotplug_register_callback] new hotplug cb 0x1b90b660 with handle 1
[ 0.241626] [000002c9] libusb: debug [libusb_get_device_list]
[ 0.247276] [000002c9] libusb: debug [libusb_get_device_descriptor]
[ 0.253413] [000002c9] libusb: debug [libusb_open] open 2.1
[ 0.307437] [000002c9] libusb: debug [usbi_add_event_source] add fd 7 events 4
usb device opened.
[ 0.310555] [000002c9] libusb: debug [libusb_kernel_driver_active] interface 0
Kernel driver is active, now try detached
[ 0.321239] [000002c9] libusb: debug [libusb_detach_kernel_driver] interface 0
Kernel driver is detached!
[ 0.330576] [000002c9] libusb: debug [libusb_claim_interface] interface 0
bulk_rev_thread started.
[ 0.339406] [000002cd] libusb: debug [libusb_submit_transfer] transfer 0x7fb0000978
[ 0.346693] [000002cd] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 500
[ 0.355917] [000002cd] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.365425] [000002cd] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.374279] [000002cd] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 60000ms
input data to send or command:test sending 100 bytes.
[ 0.387530] [000002c9] libusb: debug [libusb_submit_transfer] transfer 0x1b90b958
[ 0.394710] [000002c9] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 100
[ 0.403907] [000002c9] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.411432] [000002c9] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.419240] [000002c9] libusb: debug [libusb_free_transfer] transfer 0x1b90b958
bulk send faild, err: LIBUSB_ERROR_IO
[ 0.439767] [000002c9] libusb: debug [libusb_submit_transfer] transfer 0x1b90b958
[ 0.441504] [000002c9] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 99
[ 0.450617] [000002c9] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.458146] [000002c9] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.465942] [000002c9] libusb: debug [libusb_free_transfer] transfer 0x1b90b958
input data to send or command:bulk send faild, err: LIBUSB_ERROR_IO
[ 0.489069] [000002c9] libusb: debug [libusb_submit_transfer] transfer 0x1b90b958
[ 0.490807] [000002c9] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 99
[ 0.499912] [000002c9] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.507441] [000002c9] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.515258] [000002c9] libusb: debug [libusb_free_transfer] transfer 0x1b90b958
input data to send or command:bulk send faild, err: LIBUSB_ERROR_IO
[ 0.538381] [000002c9] libusb: debug [libusb_submit_transfer] transfer 0x1b90b958
[ 0.540128] [000002c9] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 99
[ 0.549231] [000002c9] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.556760] [000002c9] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.564561] [000002c9] libusb: debug [libusb_free_transfer] transfer 0x1b90b958
input data to send or command:bulk send faild, err: LIBUSB_ERROR_IO
求指导解决问题
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