systick计数器时钟源选择不起作用

1万 · 2021-11-21 15:49

同样的代码在两块不同的STM32H743VIT6芯片上运行，systick时钟源分别设置为SYSTICK_CLKSOURCE_HCLK_DIV8，和SYSTICK_CLKSOURCE_HCLK。一个可以设置有效。另一个设置后无效

1万 · 2021-11-21 15:52

均为400MHz

1万 · 2021-11-21 15:54

还有什么现象？能再详细描述下吗？

1万 · 2021-11-21 15:56

对比两片芯片，systick的calibration value register中TENMS值不同，可以设置成功的芯片值为0x3E8

1万 · 2021-11-21 16:00

与参考手册描述一致。另一片芯片的该寄存器值为0X493E(这个值与STM32F407的参考手册上描述的一致)，不知该寄存器的值意义是什么

1万 · 2021-11-21 16:03

因为在STM32H7参考手册中看到该值是用来计算reload的值。

1万 · 2021-11-21 16:04

但实测直接clock source除以1000就能得到时基1ms的定时中断

1万 · 2021-11-21 16:08

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2021-11-21 16:14

/* SysTick configuration */

void systick_config(void)

{

HAL_SYSTICK_Config(SystemCoreClock / 1000);

HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK_DIV8);//8分频，50MHz

// HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);//使用400MHz

HAL_NVIC_SetPriority(SysTick_IRQn, 0XF, 0);

}

/**

  * @brief System Clock Configuration

  * @retval None

  */

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};

  /** Supply configuration update enable

  */

  MODIFY_REG(PWR->CR3, PWR_CR3_SCUEN, 0);

  /** Configure the main internal regulator output voltage

  */

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  while ((PWR->D3CR & (PWR_D3CR_VOSRDY)) != PWR_D3CR_VOSRDY)

  {

  }

  /** Configure LSE Drive Capability

  */

  HAL_PWR_EnableBkUpAccess();

  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);

  /** Macro to configure the PLL clock source

  */

  __HAL_RCC_PLL_PLLSOURCE_CONFIG(RCC_PLLSOURCE_HSE);

  /** Initializes the CPU, AHB and APB busses clocks

  */

  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 = 3;//5;

  RCC_OscInitStruct.PLL.PLLN = 200;//160;

  RCC_OscInitStruct.PLL.PLLP = 2;

  RCC_OscInitStruct.PLL.PLLQ = 4;//2;

  RCC_OscInitStruct.PLL.PLLR = 2;//4;

  RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2;

  RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;

  RCC_OscInitStruct.PLL.PLLFRACN = 0;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

Error_Handler();

  }

  /** Initializes the CPU, AHB and APB busses clocks

  */

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK

                           |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2

                           |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;

  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;

  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;

  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;

  RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;

  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;

  RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;

  RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)

  {

Error_Handler();

  }

  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC|RCC_PERIPHCLK_USART2

                           |RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_SPI3

                           |RCC_PERIPHCLK_SPI2|RCC_PERIPHCLK_ADC

                           |RCC_PERIPHCLK_FMC;

  PeriphClkInitStruct.PLL2.PLL2M = 3;//1;

  PeriphClkInitStruct.PLL2.PLL2N = 200;//13;

  PeriphClkInitStruct.PLL2.PLL2P = 4;//12;

  PeriphClkInitStruct.PLL2.PLL2Q = 2;

  PeriphClkInitStruct.PLL2.PLL2R = 2;

  PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;

  PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOMEDIUM;

  PeriphClkInitStruct.PLL2.PLL2FRACN = 0;

  PeriphClkInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_D1HCLK;

  PeriphClkInitStruct.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;

  PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;

  PeriphClkInitStruct.Usart16ClockSelection = RCC_USART16CLKSOURCE_D2PCLK2;

  PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;

  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;

  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)

  {

Error_Handler();

  }

}