SWV not working with STM32F469I-DISCO

AWebe.1 · ‎2021-05-20

I'm using a 32F469IDISCOVERY board (Cortex-M4). The integrated ST-Link V2-1 has firmware V2J37M27 and is configured as "Debug + Mass storage + VCP Modus" (default). It doesn't look like it has a jumper or solder bridge to connect SWO and I think it's permanently connected to ST-Link.

I create an new empty project in STM32CubeIDE v1.6.1

File -> New -> STM32 Project
Board Selector -> STM32F469I-DISCO -> Next
Project Name: swv_foo1, Language: C, Binary Type: Executable, Project Type STM32Cube -> Next
Firmware Package STM32Cube FW_F4 V1.26.1 -> Finish
Initialize all peripherals with their default Mode? -> No
Clock Tree shows SYSCLK is HSI -> 16MHz
change PB3 to SYS_JTDO-SWO
change SYS Debug: "Trace Asynchronous Sw"
Save .ioc -> Generate Code -> YES
Add busy loop to main.c

void Delay (__IO uint32_t nCount)
 {
   while (nCount--)
     {
     }
 }

and call it in the endless loop, toggle orange LED:

while (1)
  {
    /* USER CODE END WHILE */
    HAL_GPIO_TogglePin (LED2_GPIO_Port, LED2_Pin);
    ITM_SendChar ('x');
    Delay (1000000L);
    /* USER CODE BEGIN 3 */
  }

Project -> Build Project (finished without errors or warning)
Run -> Debug Configurations -> STM32 Corex-M C/C++ Application -> New launch configuration
Debugger -> ST-LINK (ST-LINK GDB server)
Serial Wire Viewer (SWV)

[x] Enable
     Core Clock 16MHz
     SWO Clock: 2000 kHz
     Port number: 61235
     [x] Wait for sync packet

Apply -> Debug
Download and Verifying, Debugger stopps in main at HAL_Init ()

Tab "SWV ITM Data Console"

Configure Trace:

Timestamps

[x] Enable Prescaler 1

ITM Stimulus Ports

[x] 0

-> Ok

Port 0 shows up

-> red filled "record" circle (Start Trace)

F8 (Resume)

Orange LED (LED2) starts to blink but

SWV Trace Log, SWV ITM Data Console, SWV Statistical Profiling keeps empty.

I've checked DGBMCU_CR and it's 0xe0042004 so

TRACE_IOEN = 1

TRACE_MODE = 00: TRACE pin assignment for Asynchronous Mode

chapter 37.14.2 of the STM32F469xx reference manual says

0xC5ACCE55 has to be written @E0000FB0 but I'm unsure if this shouldn't be done from the debugger.

dm00354244-stm32-microcontroller-debug-toolbox-stmicroelectronics.pdf

doesn't even mention it but I also tried

volatile uint32_t *ITM_LAR = (volatile uint32_t *)0xE0000FB0; // ITM->LAR

*ITM_LAR = 0xC5ACCE55; // Enable Access

but this doesn't change anything.

I'm really running out of ideas here. Can someone help me?

Thank you, Andy

dungeonlords789 · ‎2021-11-06

This is ITM example with printf float via ITM.

Also "Output gets flushed on reaching newline character or calling fflush(stdout) function. Additionally there is an option to disable buffering entirely by calling setbuf(stdout, NULL)."

main source: AN4989