while (1)
{
    if ( (USB_OTG_dev.dev.device_status == USB_OTG_CONFIGURED) && (USB_Tx_State == 0 ))
    {
      USB_Tx_State = 1;
      DCD_EP_Tx (&USB_OTG_dev, CDC_IN_EP, (uint8_t*)&APP_Rx_Buffer[0], APP_RX_DATA_SIZE);
    }
}

#define APP_RX_DATA_SIZE (7*4096)
...
uint8_t APP_Rx_Buffer [APP_RX_DATA_SIZE];
uint8_t APP_Rx_Buffer_2 [APP_RX_DATA_SIZE];
...
SysTick_Config(SystemCoreClock /48000);
while (1)
{
if (new_data_ready == 1)
{
static uint32_t cnt = 0;
uint8_t *buf_ptr;

new_data_ready = 0;
if (USB_Tx_Buf_State == 0)
{
buf_ptr = APP_Rx_Buffer;
}
else
{
buf_ptr = APP_Rx_Buffer_2;
}

if(APP_Rx_ptr_in == APP_RX_DATA_SIZE)
{
if (APP_Rx_ptr_in_OVERFLOW <= (APP_RX_DATA_SIZE-8))
{
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'O';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'V';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'E';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'R';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'F';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'L';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'O';
buf_ptr[APP_Rx_ptr_in_OVERFLOW++] = 'W';
}
}
else
{
// Записываем 16 байт данных с частотой 48кГц
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[3];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[2];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[1];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[0];
cnt++;
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[3];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[2];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[1];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[0];
cnt++;
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[3];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[2];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[1];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[0];
cnt++;
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[3];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[2];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[1];
buf_ptr[APP_Rx_ptr_in++] = ((uint8_t*)&(cnt))[0];
cnt++;
}
}
if ( (USB_OTG_dev.dev.device_status == USB_OTG_CONFIGURED) && (USB_Tx_State == 0 ) && (APP_Rx_ptr_in > (4096-1)))
{
uint8_t *buf_ptr;
uint8_t *fill_ptr;
uint32_t buf_leftovers;
uint32_t len;

if (USB_Tx_Buf_State == 0)
{
buf_ptr = APP_Rx_Buffer;
fill_ptr = APP_Rx_Buffer_2;
USB_Tx_Buf_State = 1;
}
else
{
buf_ptr = APP_Rx_Buffer_2;
fill_ptr = APP_Rx_Buffer;
USB_Tx_Buf_State = 0;
}
len = APP_Rx_ptr_in;
APP_Rx_ptr_in = 0;
APP_Rx_ptr_in_OVERFLOW = 0;
// Копируем данные из бефера, которые не кратны 4096
// т.к. приемный буфер драйвера VCP от ST размером 4096
buf_leftovers = len & 0x00000FFF;
len -= buf_leftovers;
while (APP_Rx_ptr_in < buf_leftovers)
{
fill_ptr[APP_Rx_ptr_in] = buf_ptr[(len+APP_Rx_ptr_in)];
APP_Rx_ptr_in++;
}

USB_Tx_State = 1;
DCD_EP_Tx (&USB_OTG_dev, CDC_IN_EP, buf_ptr, len);
}
}
...
void SysTick_Handler(void)
{
new_data_ready = 1;
}

Имя образа                     PID Имя сессии          № сеанса       Память
========================= ======== ================ =========== ============
System Idle Process              0 Services                   0        24 КБ
System                           4 Services                   0       236 КБ
smss.exe                       352 Services                   0       540 КБ
csrss.exe                      620 Services                   0     1 644 КБ
wininit.exe                    816 Services                   0       952 КБ
csrss.exe                      824 Console                    1    10 048 КБ
winlogon.exe                   880 Console                    1     2 744 КБ
services.exe                   908 Services                   0     5 660 КБ
lsass.exe                      940 Services                   0     5 852 КБ
lsm.exe                        948 Services                   0     2 716 КБ
svchost.exe                   1060 Services                   0     4 660 КБ
svchost.exe                   1136 Services                   0     4 260 КБ
Ati2evxx.exe                  1184 Services                   0     1 848 КБ
svchost.exe                   1268 Services                   0     9 248 КБ
svchost.exe                   1312 Services                   0    31 032 КБ
svchost.exe                   1336 Services                   0    15 392 КБ
svchost.exe                   1476 Services                   0     3 264 КБ
svchost.exe                   1548 Services                   0     6 180 КБ
Ati2evxx.exe                  1644 Console                    1     3 732 КБ
spoolsv.exe                   1760 Services                   0     5 296 КБ
svchost.exe                   1792 Services                   0     4 052 КБ
explorer.exe                   632 Console                    1    54 272 КБ
taskhost.exe                  1152 Console                    1     4 572 КБ
acrotray.exe                  2248 Console                    1     1 212 КБ
issch.exe                     2256 Console                    1     1 404 КБ
TPwrMain.exe                  2272 Console                    1     2 764 КБ
TCrdMain.exe                  2644 Console                    1     5 736 КБ
TosCoSrv.exe                  2760 Services                   0     1 144 КБ
KeNotify.exe                  2960 Console                    1     1 392 КБ
CeEKey.exe                    2972 Console                    1     1 536 КБ
nncron.exe                    3076 Console                    1       604 КБ
nnguard.exe                   3304 Console                    1       180 КБ
svchost.exe                   3648 Services                   0     1 536 КБ
RtHDVCpl.exe                  4044 Console                    1     2 660 КБ
lock.exe                      3352 Console                    1     3 164 КБ
cmd.exe                       5240 Console                    1     1 556 КБ
conhost.exe                   5072 Console                    1     2 132 КБ
HxD.exe                       3544 Console                    1    10 696 КБ
notepad++.exe                 5832 Console                    1    31 932 КБ
USBLyzer.exe                  2348 Console                    1   290 392 КБ
serial.exe                    1236 Console                    1     2 888 КБ
conhost.exe                   3512 Console                    1     3 888 КБ
audiodg.exe                   6120 Services                   0    15 064 КБ
TrustedInstaller.exe          4980 Services                   0     5 960 КБ
tasklist.exe                   444 Console                    1     4 588 КБ
WmiPrvSE.exe                  4412 Services                   0     5 192 КБ