arduino - 使用 PlatformIO (Arduino) 从内部振荡器运行 STM32F103？

Question

如何将 STM32F103C8 配置为使用内部 RC 振荡器/HSI 和 PLL 运行，即无需外部晶体振荡器(如“蓝色药丸”板上所示)并使用 PlatformIO 中的 Arduino 框架？

• https://docs.platformio.org/en/latest/boards/ststm32/bluepill_f103c8.html
• https://docs.platformio.org/en/latest/boards/ststm32/genericSTM32F103C8.html
• https://docs.platformio.org/en/latest/frameworks/arduino.html

platformio.ini:

[env:bluepill_f103c8]
platform = ststm32
board = bluepill_f103c8
#board = genericSTM32F103C8
#board_build.mcu = stm32f103c8t6
#board_build.f_cpu = 72000000L

framework = arduino
lib_deps = olikraus/U8g2 @ ^2.28.7

upload_protocol = stlink

Answer 1

我在 PlatformIO 目录中进行了一些挖掘。

以下路径适用于“通用”:

• C:\Users\<user>\.platformio\platforms\ststm32\boards\genericSTM32F103C8.json
• C:\Users\<user>\.platformio\packages\framework-arduinoststm32\variants\Generic_F103Cx\variant.cpp

定义您自己的系统时钟配置，例如你的main.cpp :

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInit;

  /* Initializes the CPU, AHB and APB busses clocks */
  // RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  // RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  // RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  // RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
    while (1);
  }

  /* Initializes the CPU, AHB and APB busses 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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
    while (1);
  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC ;
  PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV1_5;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
    while (1);
  }
}

ini 是:

[env:bluepill_f103c8]
platform = ststm32
board = genericSTM32F103C8
framework = arduino
upload_protocol = stlink
lib_deps = olikraus/U8g2 @ ^2.28.7

我建议重命名 env以避免混淆。

我尚未验证实际时钟速度。

---

它应以 36 MHz (8 MHz/2*9) 运行。然后ini需要`board_build.f_cpu = 36000000L`