STM32F446 HSE, HSI problem.

[GSay.1]

Hi guys,

I'm facing a problem with STMF446RE MCU. I designed custom stm32f446re board. When i try to upload a program, it uploads successfully but it does not execute it. In STM32CUBEIDE, i can connect a device and achieve debug mode. In debug mode,  SystemClock_Config(); is freezing but only in HSE. if confg my mcu clock internal resonator HSI, my program works. But in External resonator mode HSE, the SystemClock_Config is freezing in debug mode and program does not execute it. what can be the problem?

Thank you.

[waclawek.jan]

> is freezing but only in HSE

Your HSE oscillator does not oscillate. Check crystal, check capacitors if they are of proper value, check connections for opens and shorts.

JW

[GSay.1]

I checked them but nothing changes. I also tried different crystals and capacitors but it remain same.

[waclawek.jan]

Single-step through the code. Where does it exactly "freeze" and how?

Try your code on a "known good" board such as Nucleo or Disco (not necessarily 'F446 - any 'F4 or would do, the clocking scheme is similar).

JW

[GSay.1]

In void SystemClock_Config(void), i comment out only;

{

 RCC_OscInitTypeDef RCC_OscInitStruct = {0};

 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

 /** Configure the main internal regulator output voltage

 */

 __HAL_RCC_PWR_CLK_ENABLE();

 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

 /** Initializes the RCC Oscillators according to the specified parameters

 * in the RCC_OscInitTypeDef structure.

 */

 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;

 RCC_OscInitStruct.HSEState = RCC_HSE_ON;

and it freeze on last line. I already tried on discovery and it works.

Thanks for your reply.

[Tesla DeLorean]

What are you doing with BOOT0 pin? Pulled to ground? VCAP pins? What voltages do you see there?

Write a very small app that just brings up the clocks, perhaps review the RM, and just walk in a couple of interactions with the RCC registers to bring HSE_ON.

Perhaps also route HSE to MCO pin (PA8) so you can measure the the clock without loading the crystal with a scope. Determine if it comes on, how quickly, etc.

[GSay.1]

it s pulled to ground and 3.3v i tried both of it one by one and nothing changes. 4.7 uf has been used for Vcap capacitor and there is 1.135v on it. Okay i ll try what you said mate.

Thanks for your reply