USBdevice.cpp

Go to the documentation of this file.

/*
 * USBdevice.cpp
 *
 *  Created on: 19.02.2021
 *      Author: Yannick
 */
 
#include "USBdevice.h"
#include "tusb.h"
 
uint16_t _desc_str[USB_STRING_DESC_BUF_SIZE]; // String buffer
 
USBdevice::USBdevice(const tusb_desc_device_t* deviceDesc,const uint8_t (*confDesc),const usb_string_desc_t* strings, uint8_t appendSerial) :
Thread("USB", 330, 40), desc_device(deviceDesc), desc_conf(confDesc), string_desc(strings),appendSerial(appendSerial) {
 
}
 
USBdevice::~USBdevice() {
 
}

void USBdevice::registerUsb(){
    // Global callback pointer
    extern USBdevice* usb_device;
    usb_device = this;
 
    this->Start();
}
 
void USBdevice::Run(){
    tusb_init();
    while(1){
        tud_task(); // Run until no usb events left
    }
}

std::string USBdevice::getUsbSerial(){
    char buf[25];
    std::snprintf(buf,25,"%08lx%08lx%08lx",HAL_GetUIDw2(),HAL_GetUIDw1(),HAL_GetUIDw0()); // Print as hex string
    std::string serial{buf}; //std::to_string(HAL_GetUIDw0()) + std::to_string(HAL_GetUIDw1()) + std::to_string(HAL_GetUIDw2());
 
    return serial;
}
 
const uint8_t* USBdevice::getUsbDeviceDesc(){
    return (uint8_t*)desc_device;
}
 
const uint8_t* USBdevice::getUsbConfigurationDesc(uint8_t index){
    return desc_conf;
}

uint16_t* USBdevice::getUsbStringDesc(uint8_t index,uint16_t langid){
    (void) langid;
    uint16_t chr_count = 0;
    if (index == 0) // Language
    {
        _desc_str[1] = string_desc->langId;
        chr_count = 1;
    }else{
        std::string field;
        if(index == desc_device->iSerialNumber){
            field = getUsbSerial();
        }else if(index == desc_device->iProduct){
            field = string_desc->product;
        }else if(index == desc_device->iManufacturer){
            field = string_desc->manufacturer;
        }else if(index > 3 && ((index - 4) < (int)string_desc->interfaces.size())){
            field = string_desc->interfaces[index-4];
            if(appendSerial){
                field += "(";
                field.append(std::to_string(HAL_GetUIDw0()).substr(0, appendSerial));
                field += ")";
            }
        }else{
            return NULL;
        }
        chr_count = std::min<uint8_t>(USB_STRING_DESC_BUF_SIZE-1,field.length());
        // Convert ASCII string into UTF-16
        for(uint8_t i=0; i < chr_count; i++)
        {
          _desc_str[1+i] = field[i];
        }
    }
 
    // first byte is length (including header), second byte is string type
    _desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2*chr_count + 2);
 
    return _desc_str;
}