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void init(libusb_context **context, libusb_device ***devices, ssize_t *devices_count){
int status = libusb_init(context);
if(status != 0){perror("libusb_init"); exit(-1);}
*devices_count = libusb_get_device_list(*context, devices);
if(*devices_count < 0){perror("libusb_get_device_list"); exit(-1);}
}
libusb_device* searchArduino(libusb_device **devices, ssize_t devices_count){
for(int i=0; i<devices_count; i++){
libusb_device *device = devices[i];
// device description
struct libusb_device_descriptor desc;
int status = libusb_get_device_descriptor(device, &desc);
if(status != 0) continue;
// search for device
if(desc.idVendor == ID_VENDOR
&& desc.idProduct == ID_PRODUCT)
return device;
}
return NULL;
}
void openConnection(libusb_device *arduino, libusb_device_handle **handle, struct libusb_config_descriptor **config_desc){
// open connection
int status = libusb_open(arduino, handle);
if(status != 0){ perror("libusb_open"); exit(-1); }
// prepare config
status = libusb_get_config_descriptor(arduino, 0, config_desc);
if(status != 0){ perror("libusb_get_config_descriptor"); exit(-1); }
int configuration = (*config_desc)->bConfigurationValue;
// detach kernel
for(int j=0; j<(*config_desc)->bNumInterfaces; j++){
int interface = (*config_desc)->interface[j].altsetting[0].bInterfaceNumber;
if(libusb_kernel_driver_active(*handle, interface)){
status = libusb_detach_kernel_driver(*handle, interface);
if(status != 0){ perror("libusb_detach_kernel_driver"); exit(-1); }
}
}
// use config
status = libusb_set_configuration(*handle, configuration);
if(status != 0){ perror("libusb_set_configuration"); exit(-1); }
// claim interfaces
for(int j=0; j<(*config_desc)->bNumInterfaces; j++){
struct libusb_interface_descriptor interface_desc = (*config_desc)->interface[j].altsetting[0];
int interface = interface_desc.bInterfaceNumber;
status = libusb_claim_interface(*handle, interface);
if(status != 0){ perror("libusb_claim_interface"); exit(-1); }
}
}
void getEndpoints(struct libusb_config_descriptor *config_desc, struct libusb_endpoint_descriptor *endpoint_desc_list){
int count = 0;
// in interfaces
for(int j=0; j<config_desc->bNumInterfaces; j++){
// find endpoints
for(int k=0; k<config_desc->interface[j].altsetting[0].bNumEndpoints; k++){
if(count > ENDPOINTS_NUMBER){ printf("getEndpoints: Array out of bound :%d:", count); exit(-1); }
*(endpoint_desc_list + count) = config_desc->interface[j].altsetting[0].endpoint[k];
count++;
}
}
//if(count != ENDPOINTS_NUMBER){ printf("Wrong number of endpoints.\nIs this the good device ?\n"); exit(-1); }
}
void start(libusb_context **context, libusb_device ***devices, libusb_device_handle **handle, struct libusb_config_descriptor **config_desc, struct libusb_endpoint_descriptor *endpoint_desc_list){
// init
ssize_t devices_count;
init(context, devices, &devices_count);
// get arduino device
libusb_device *arduino = searchArduino(*devices, devices_count);
if(arduino == NULL){ printf("Arduino device not found\n"); exit(-1); }
// open connection, use config, detach kernel and claim interfaces
openConnection(arduino, handle, config_desc);
// get enpoints
getEndpoints(*config_desc, endpoint_desc_list);
}
void stop(struct libusb_config_descriptor *config_desc, libusb_device_handle *handle, libusb_device **devices, libusb_context *context){
// release interfaces
for(int j=0; j<config_desc->bNumInterfaces; j++){
struct libusb_interface_descriptor interface_desc = config_desc->interface[j].altsetting[0];
int interface = interface_desc.bInterfaceNumber;
int status = libusb_release_interface(handle, interface);
if(status != 0){ perror("libusb_release_interface"); exit(-1); }
}
// free config
libusb_free_config_descriptor(config_desc);
// close connection
libusb_close(handle);
// free device list
libusb_free_device_list(devices, 1);
// libusb exit
libusb_exit(context);
}
void sendData(int endpoint_id, uint8_t data, libusb_device_handle *handle, struct libusb_endpoint_descriptor *endpoint_desc_list){
if(endpoint_id < 0 || endpoint_id > 1){ printf("(sendData) Wrong endpoint !\nMust be 0 or 1\n"); return; }
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