Changing stm32L4 clock speed to 26 Mhz

Posted on June 03, 2018 at 02:40

((4 / 1) * 13) / 2 = 26

  /* MSI is enabled after System reset, activate PLL with MSI as source */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;

  RCC_OscInitStruct.MSIState = RCC_MSI_ON;

  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; // 4 MHz

  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;

  RCC_OscInitStruct.PLL.PLLM = 1;

  RCC_OscInitStruct.PLL.PLLN = 13;

  RCC_OscInitStruct.PLL.PLLR = 2;

  RCC_OscInitStruct.PLL.PLLP = 7;

  RCC_OscInitStruct.PLL.PLLQ = 4;

  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    /* Initialization Error */

    while(1);

  }