Doesn't transmit data via SWO STM32H743

[Alex Golubev]

I can not start transfer via SWO to STM32H743.

Port PB3 initialized clock feed.

Initialized SWO:

*(__IO uint32_t*)(0x5C001004) |= 0x00700000; // DBGMCU_CR D3DBGCKEN D1DBGCKEN TRACECLKEN
 
     //UNLOCK FUNNEL
     *(__IO uint32_t*)(0x5C004FB0) = 0xC5ACCE55; // SWTF_LAR
     *(__IO uint32_t*)(0x5C003FB0) = 0xC5ACCE55; // SWO_LAR
 
     //SWO current output divisor register
     //This divisor value (0x000000C7) corresponds to 400Mhz
     //To change it, you can use the following rule
     // value = (CPU Freq/sw speed )-1
      *(__IO uint32_t*)(0x5C003010) = ((SystemCoreClock / 2000000) - 1); // SWO_CODR
 
     //SWO selected pin protocol register
      *(__IO uint32_t*)(0x5C0030F0) = 0x00000002; // SWO_SPPR
 
     //Enable ITM input of SWO trace funnel
      *(__IO uint32_t*)(0x5C004000) |= 0x00000001; // SWFT_CTRL
 
     // Configure GPIOB pin 3 as AF
      *(__IO uint32_t*)(0x58020400) = (*(__IO uint32_t*)(0x58020400) & 0xffffff3f) | 0x00000080;
 
     // Configure GPIOB pin 3 Speed
      *(__IO uint32_t*)(0x58020408) |= 0x00000080;
 
     // Force AF0 for GPIOB pin 3
      *(__IO uint32_t*)(0x58020420) &= 0xFFFF0FFF;
 
 uint32_t SystemCoreClock = 480000000;

include printf:

int _write ( int file, char *ptr, int len )
{
  int i = 0;
  for ( i = 0; i < len; i++ )
    ITM_SendChar ( *ptr++ );
  return len;
}

Calls when passing a message through printf (); Checked set the brepoint in _write the moment the transfer is called

I checked the PB3 leg with an oscilloscope there is no signal. The call to _write is passed to ITM_SendChar (* ptr ++); there is.

What is the matter, I ask for help.