HSE UART issue

[KOPRO]

Hello STM32 Team.

I using uart1,3,6 setting for baud rate 115200,

Uart3 setting is it.

  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }
  HAL_UART_Receive_IT(&huart3,&rxd3,1);

HSI using Uart is it ok,

But, HSE 8Mhz crystal, broken uart message.

Only difference function "void SystemClock_Config(void)"

How can i fix it?

[Setting HSI]

Terminal Message [ok]

void SystemClock_Config(void)
{
  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_SCALE1);

  // Initializes the RCC Oscillators according to the specified parameters
  // in the RCC_OscInitTypeDef structure.

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  // Initializes the CPU, AHB and APB buses clocks

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

[Setting HSE]

Terminal message [broken]

project.ioc

this is my SystemClock_Config source

void SystemClock_Config(void)
{
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_SCALE1);

// Initializes the RCC Oscillators according to the specified parameters
// in the RCC_OscInitTypeDef structure.

RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 216;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV6;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}

// Initializes the CPU, AHB and APB buses clocks

RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}

[Tesla DeLorean]

Sorry, but what STM32 part are you talking about and on what board?

Check HSE_VALUE is reflective of the actual HSE Frequency. 

[KOPRO]

Hello.

I also checked that HSE_VALUE is correct.

#define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz */

Part name is "STM32F412RGT6"

Include board schematic. 

We are modifying and testing the circuit for the CTS RTS test of UART1.

UART6 is used as CTS RTS, and UART3 is used as USB output debugger.

system_stm32f4xx.c

#include "stm32f4xx.h"

#if !defined (HSE_VALUE)
#define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz */
#endif /* HSE_VALUE */

#if !defined (HSI_VALUE)
#define HSI_VALUE ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
#endif /* HSI_VALUE */

[SofLit]

Hello,

First try to output your system clock on MCO pin and check if you get your 36MHz. It could be something not good from your external crystal/resonator.

[KOPRO]

Like you said
I measured the following using an oscilloscope.
When in HSE mode, the frequency is abnormal as shown below.

[When in HSE mode = Abnormal (Fail)]
PA8(HSE), PC9 (SystemClock)
CH1 = System clock = PC9(System Clock)
CH2 = Crystal Clock = PA8(HSE) is 8Mhz

[When in HSI mode = Normal (Pass)]
CH1 = System clock = PC9(System Clock) is 15.96Mhz
CH2 = Crystal Clock = PA8(HSI) is 15.96Mhz

Below are photos and measured videos.

void SystemClock_Config(void)
{
	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_SCALE1);
	// Initializes the RCC Oscillators according to the specified parameters
	// in the RCC_OscInitTypeDef structure.
	//	HSE Cystal = 8Mhz
	//	SYSCLK = 36MHZ
	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
	RCC_OscInitStruct.HSEState = RCC_HSE_ON;
	RCC_OscInitStruct.LSEState = RCC_LSE_ON;
	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
	RCC_OscInitStruct.PLL.PLLM = 8;
	RCC_OscInitStruct.PLL.PLLN = 216;
	RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV6;
	RCC_OscInitStruct.PLL.PLLQ = 2;
	RCC_OscInitStruct.PLL.PLLR = 2;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
	{
		Error_Handler();
	}
	// Initializes the CPU, AHB and APB buses clocks
	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
	|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
	{
		Error_Handler();
	}
	HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1); //  PA8
	HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_1); // PC9
}

[KOPRO]

We don't care what Mhz the system clock is set to.

So I changed the settings as below.

HSE 8Mhz
System Clock 32Mhz

I confirmed with an oscilloscope that 32MHz was coming out.
The same broken phenomenon still occurs in UART.

void SystemClock_Config(void)
{

	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_SCALE1);

	// Initializes the RCC Oscillators according to the specified parameters
	// in the RCC_OscInitTypeDef structure.
	//	HSE Cystal = 8Mhz
	//	SYSCLK = 36MHZ
	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
	RCC_OscInitStruct.HSEState = RCC_HSE_ON;
	RCC_OscInitStruct.LSEState = RCC_LSE_ON;
	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
	RCC_OscInitStruct.PLL.PLLM = 4;
	RCC_OscInitStruct.PLL.PLLN = 96;
	RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV6;
	RCC_OscInitStruct.PLL.PLLQ = 2;
	RCC_OscInitStruct.PLL.PLLR = 2;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
	{
		Error_Handler();
	}

	// Initializes the CPU, AHB and APB buses clocks

	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
	|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
	{
		Error_Handler();
	}
	HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1);
	HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_1);
}

 

[SofLit]

Hmm .. that's weird!

Could you please send a minimal project that reproduces the issue (including your .ioc file) so I can try it on one of our boards?

[KOPRO]

I will organize and upload the (.Ioc) file attachment.
Although I am using FreeRTOS,
Test USART1 with an oscilloscope
I sent a sample message with Uart.
“Hello world!”
Just swap HSI and HSE.
HSI = 1.040ms / normally received
HSE = 3.240ms / Data corruption phenomenon

The difference between HSE and HSI is 3.11 times.

[Hello world! , HSE = 3.240ms]

[Hello world! , HSI = 3.240ms]

[SofLit]

Hello,

Ok, and please attach a very simple project no RTOS, nothing else.. just a simple "printf" project. 

[KOPRO · Accepted solution]

This issue has been resolved.
Create a project without FreeRTOS and add only UART
When tested, it worked normally.
Afterwards, the .ioc file was stored for testing in FreeRTOS.
I found that the Heap Size was set to 2048 for many task.
This seems to have exceeded the Heap Size and caused problems in the UART. When the Heap Size was set to 1024, the UART was output normally.

Thaks you,

Best regards,