SOURCES = main.c gpio.c ssd1306.c display.c flash.c max31855.c max31865.c pid.c

SOURCES += system/usbd_conf.c system/usbd_cdc_if.c system/usb_device.c system/usbd_desc.c system/spi.c system/interrupts.c system/system_stm32f0xx.c system/stringhelpers.c system/syslib.c 

    // Restore settings from flash memory

            // Only support heating (ssr_output > 0) right now

            if(ssr_output > 0) 

            {

                char tempstr[6];

                itoa(ssr_output, tempstr, 10);

                ssd1306_DrawString(tempstr, 0, 90);

        // Transmit temperature over USB-CDC on a regulat basis

#!/bin/bash

cd build

st-flash write main.bin 0x8000000

cd ..

# USB DFU:

#dfu-util -a 0 -d 0483:df11 -s 0x08000000:leave -D build/main.bin 

#sleep 1

#dfu-util -a 1 -s 0x1FFFF800:8 -D optbytes.dat

#include "stm32f0xx_hal_conf.h"

#include "stm32f0xx_hal_gpio_ex.h"

SPI_HandleTypeDef hspi1;

void spi_init()

{

    hspi1.Instance = SPI1;

    hspi1.Init.Mode = SPI_MODE_MASTER;

    hspi1.Init.Direction = SPI_DIRECTION_2LINES;

    hspi1.Init.DataSize = SPI_DATASIZE_8BIT;

    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;

    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;

    hspi1.Init.NSS = SPI_NSS_SOFT;

    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;

    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;

    hspi1.Init.TIMode = SPI_TIMODE_DISABLED;

    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;

    hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLED;

    HAL_SPI_Init(&hspi1);

}    

SPI_HandleTypeDef* spi_get()

{

    return &hspi1;

}

// vim:softtabstop=4 shiftwidth=4 expandtab 

#ifndef SPI_H

#define SPI_H

#include "stm32f0xx_hal_conf.h"

void spi_init();

SPI_HandleTypeDef* spi_get();

#endif

// vim:softtabstop=4 shiftwidth=4 expandtab 

/**

  ******************************************************************************

  * @file    stm32f0xx_hal_conf.h

  * @brief   HAL configuration template file.

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>

  *

  * Redistribution and use in source and binary forms, with or without modification,

  * are permitted provided that the following conditions are met:

  *   1. Redistributions of source code must retain the above copyright notice,

  *      this list of conditions and the following disclaimer.

  *   2. Redistributions in binary form must reproduce the above copyright notice,

  *      this list of conditions and the following disclaimer in the documentation

  *      and/or other materials provided with the distribution.

  *   3. Neither the name of STMicroelectronics nor the names of its contributors

  *      may be used to endorse or promote products derived from this software

  *      without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

  ******************************************************************************

  */

/* Define to prevent recursive inclusion -------------------------------------*/

#ifndef __STM32F0xx_HAL_CONF_H

#define __STM32F0xx_HAL_CONF_H

#ifdef __cplusplus

 extern "C" {

#endif

/* Exported types ------------------------------------------------------------*/

/* Exported constants --------------------------------------------------------*/

/* ########################## Module Selection ############################## */

/**

  * @brief This is the list of modules to be used in the HAL driver

  */

#define HAL_MODULE_ENABLED

//#define HAL_ADC_MODULE_ENABLED

//#define HAL_CAN_MODULE_ENABLED

//#define HAL_CEC_MODULE_ENABLED

//#define HAL_COMP_MODULE_ENABLED

//#define HAL_CRC_MODULE_ENABLED

//#define HAL_CRYP_MODULE_ENABLED

//#define HAL_TSC_MODULE_ENABLED

//#define HAL_DAC_MODULE_ENABLED

//#define HAL_I2C_MODULE_ENABLED

//#define HAL_I2S_MODULE_ENABLED

//#define HAL_IWDG_MODULE_ENABLED

//#define HAL_LCD_MODULE_ENABLED

//#define HAL_LPTIM_MODULE_ENABLED

//#define HAL_RNG_MODULE_ENABLED

//#define HAL_RTC_MODULE_ENABLED

#define HAL_SPI_MODULE_ENABLED

#define HAL_TIM_MODULE_ENABLED

//#define HAL_UART_MODULE_ENABLED

//#define HAL_USART_MODULE_ENABLED

//#define HAL_IRDA_MODULE_ENABLED

//#define HAL_SMARTCARD_MODULE_ENABLED

//#define HAL_SMBUS_MODULE_ENABLED

//#define HAL_WWDG_MODULE_ENABLED

#define HAL_PCD_MODULE_ENABLED

#define HAL_CORTEX_MODULE_ENABLED

#define HAL_DMA_MODULE_ENABLED

#define HAL_FLASH_MODULE_ENABLED

#define HAL_GPIO_MODULE_ENABLED

#define HAL_PWR_MODULE_ENABLED

#define HAL_RCC_MODULE_ENABLED

/* ########################## HSE/HSI Values adaptation ##################### */

/**

  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.

  *        This value is used by the RCC HAL module to compute the system frequency

  *        (when HSE is used as system clock source, directly or through the PLL).

  */

#if !defined  (HSE_VALUE)

  #define HSE_VALUE    ((uint32_t)16000000) /*!< Value of the External oscillator in Hz */

#endif /* HSE_VALUE */

/**

  * @brief In the following line adjust the External High Speed oscillator (HSE) Startup

  *        Timeout value

  */

#if !defined  (HSE_STARTUP_TIMEOUT)

  #define HSE_STARTUP_TIMEOUT    ((uint32_t)5000)   /*!< Time out for HSE start up, in ms */

#endif /* HSE_STARTUP_TIMEOUT */

/**

  * @brief Internal High Speed oscillator (HSI) value.

  *        This value is used by the RCC HAL module to compute the system frequency

  *        (when HSI is used as system clock source, directly or through the PLL).

  */

#if !defined  (HSI_VALUE)

  #define HSI_VALUE    ((uint32_t)8000000) /*!< Value of the Internal oscillator in Hz*/

#endif /* HSI_VALUE */

/**

  * @brief In the following line adjust the Internal High Speed oscillator (HSI) Startup

  *        Timeout value

  */

#if !defined  (HSI_STARTUP_TIMEOUT)

 #define HSI_STARTUP_TIMEOUT   ((uint32_t)5000) /*!< Time out for HSI start up */

#endif /* HSI_STARTUP_TIMEOUT */

/**

  * @brief Internal High Speed oscillator for ADC (HSI14) value.

  */

#if !defined  (HSI14_VALUE)

#define HSI14_VALUE ((uint32_t)14000000) /*!< Value of the Internal High Speed oscillator for ADC in Hz.

					     The real value may vary depending on the variations

					     in voltage and temperature.  */

#endif /* HSI14_VALUE */

/**

  * @brief Internal High Speed oscillator for USB (HSI48) value.

  */

#if !defined  (HSI48_VALUE)

#define HSI48_VALUE ((uint32_t)48000000) /*!< Value of the Internal High Speed oscillator for USB in Hz.

					     The real value may vary depending on the variations

					     in voltage and temperature.  */

#endif /* HSI48_VALUE */

/**

  * @brief Internal Low Speed oscillator (LSI) value.

  */

#if !defined  (LSI_VALUE)

 #define LSI_VALUE  ((uint32_t)40000)

#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz

					     The real value may vary depending on the variations

					     in voltage and temperature.  */

/**

  * @brief External Low Speed oscillator (LSI) value.

  */

#if !defined  (LSE_VALUE)

 #define LSE_VALUE  ((uint32_t)32768)    /*!< Value of the External Low Speed oscillator in Hz */

#endif /* LSE_VALUE */

/* Tip: To avoid modifying this file each time you need to use different HSE,

   ===  you can define the HSE value in your toolchain compiler preprocessor. */

/* ########################### System Configuration ######################### */

/**

  * @brief This is the HAL system configuration section

  */

#define  VDD_VALUE                    ((uint32_t)3300) /*!< Value of VDD in mv */

#define  TICK_INT_PRIORITY            ((uint32_t)0)    /*!< tick interrupt priority (lowest by default)  */

									      /*  Warning: Must be set to higher priority for HAL_Delay()  */

									      /*  and HAL_GetTick() usage under interrupt context          */

#define  USE_RTOS                     0

#define  PREFETCH_ENABLE              0

#define  INSTRUCTION_CACHE_ENABLE     0

#define  DATA_CACHE_ENABLE            0

/* ########################## Assert Selection ############################## */

/**

  * @brief Uncomment the line below to expanse the "assert_param" macro in the

  *        HAL drivers code

  */

/* #define USE_FULL_ASSERT   1 */

/* Includes ------------------------------------------------------------------*/

/**

  * @brief Include module's header file

  */

#ifdef HAL_RCC_MODULE_ENABLED

 #include "stm32f0xx_hal_rcc.h"

#endif /* HAL_RCC_MODULE_ENABLED */

#ifdef HAL_GPIO_MODULE_ENABLED

 #include "stm32f0xx_hal_gpio.h"

#endif /* HAL_GPIO_MODULE_ENABLED */

#ifdef HAL_DMA_MODULE_ENABLED

  #include "stm32f0xx_hal_dma.h"

#endif /* HAL_DMA_MODULE_ENABLED */

#ifdef HAL_CORTEX_MODULE_ENABLED

 #include "stm32f0xx_hal_cortex.h"

#endif /* HAL_CORTEX_MODULE_ENABLED */

#ifdef HAL_ADC_MODULE_ENABLED

 #include "stm32f0xx_hal_adc.h"

#endif /* HAL_ADC_MODULE_ENABLED */

#ifdef HAL_CAN_MODULE_ENABLED

 #include "stm32f0xx_hal_can.h"

#endif /* HAL_CAN_MODULE_ENABLED */

#ifdef HAL_CEC_MODULE_ENABLED

 #include "stm32f0xx_hal_cec.h"

#endif /* HAL_CEC_MODULE_ENABLED */

#ifdef HAL_COMP_MODULE_ENABLED

 #include "stm32f0xx_hal_comp.h"

#endif /* HAL_COMP_MODULE_ENABLED */

#ifdef HAL_CRC_MODULE_ENABLED

 #include "stm32f0xx_hal_crc.h"

#endif /* HAL_CRC_MODULE_ENABLED */

#ifdef HAL_DAC_MODULE_ENABLED

 #include "stm32f0xx_hal_dac.h"

#endif /* HAL_DAC_MODULE_ENABLED */

#ifdef HAL_FLASH_MODULE_ENABLED

 #include "stm32f0xx_hal_flash.h"

#endif /* HAL_FLASH_MODULE_ENABLED */

#ifdef HAL_I2C_MODULE_ENABLED

 #include "stm32f0xx_hal_i2c.h"

#endif /* HAL_I2C_MODULE_ENABLED */

#ifdef HAL_I2S_MODULE_ENABLED

 #include "stm32f0xx_hal_i2s.h"

#endif /* HAL_I2S_MODULE_ENABLED */

#ifdef HAL_IRDA_MODULE_ENABLED

 #include "stm32f0xx_hal_irda.h"

#endif /* HAL_IRDA_MODULE_ENABLED */

#ifdef HAL_IWDG_MODULE_ENABLED

 #include "stm32f0xx_hal_iwdg.h"

#endif /* HAL_IWDG_MODULE_ENABLED */

#ifdef HAL_PCD_MODULE_ENABLED

 #include "stm32f0xx_hal_pcd.h"

#endif /* HAL_PCD_MODULE_ENABLED */

#ifdef HAL_PWR_MODULE_ENABLED

 #include "stm32f0xx_hal_pwr.h"

#endif /* HAL_PWR_MODULE_ENABLED */

#ifdef HAL_RTC_MODULE_ENABLED

 #include "stm32f0xx_hal_rtc.h"

#endif /* HAL_RTC_MODULE_ENABLED */

#ifdef HAL_SMARTCARD_MODULE_ENABLED

 #include "stm32f0xx_hal_smartcard.h"

#endif /* HAL_SMARTCARD_MODULE_ENABLED */

#ifdef HAL_SMBUS_MODULE_ENABLED

 #include "stm32f0xx_hal_smbus.h"

#endif /* HAL_SMBUS_MODULE_ENABLED */

#ifdef HAL_SPI_MODULE_ENABLED

 #include "stm32f0xx_hal_spi.h"

#endif /* HAL_SPI_MODULE_ENABLED */

#ifdef HAL_TIM_MODULE_ENABLED

 #include "stm32f0xx_hal_tim.h"

#endif /* HAL_TIM_MODULE_ENABLED */

#ifdef HAL_TSC_MODULE_ENABLED

 #include "stm32f0xx_hal_tsc.h"

#endif /* HAL_TSC_MODULE_ENABLED */

#ifdef HAL_UART_MODULE_ENABLED

 #include "stm32f0xx_hal_uart.h"

#endif /* HAL_UART_MODULE_ENABLED */

#ifdef HAL_USART_MODULE_ENABLED

 #include "stm32f0xx_hal_usart.h"

#endif /* HAL_USART_MODULE_ENABLED */

#ifdef HAL_WWDG_MODULE_ENABLED

 #include "stm32f0xx_hal_wwdg.h"

#endif /* HAL_WWDG_MODULE_ENABLED */

/* Exported macro ------------------------------------------------------------*/

#ifdef  USE_FULL_ASSERT

/**

  * @brief  The assert_param macro is used for function's parameters check.

  * @param  expr: If expr is false, it calls assert_failed function

  *         which reports the name of the source file and the source

  *         line number of the call that failed.

  *         If expr is true, it returns no value.

  * @retval None

  */

  #define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__))

/* Exported functions ------------------------------------------------------- */

  void assert_failed(uint8_t* file, uint32_t line);

#else

  #define assert_param(expr) ((void)0)

#endif /* USE_FULL_ASSERT */

#ifdef __cplusplus

}

#endif

#endif /* __STM32F0xx_HAL_CONF_H */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

/**

  ******************************************************************************

  * @file    system_stm32f0xx.c

  * @author  MCD Application Team

  * @version V2.1.0

  * @date    03-Oct-2014

  * @brief   CMSIS Cortex-M0 Device Peripheral Access Layer System Source File.

  *

  * 1. This file provides two functions and one global variable to be called from

  *    user application:

  *      - SystemInit(): This function is called at startup just after reset and

  *                      before branch to main program. This call is made inside

  *                      the "startup_stm32f0xx.s" file.

  *

  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used

  *                                  by the user application to setup the SysTick

  *                                  timer or configure other parameters.

  *

  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must

  *                                 be called whenever the core clock is changed

  *                                 during program execution.

  *

  * 2. After each device reset the HSI (8 MHz) is used as system clock source.

  *    Then SystemInit() function is called, in "startup_stm32f0xx.s" file, to

  *    configure the system clock before to branch to main program.

  *

  * 3. This file configures the system clock as follows:

  *=============================================================================

  *                         Supported STM32F0xx device

  *-----------------------------------------------------------------------------

  *        System Clock source                    | HSI

  *-----------------------------------------------------------------------------

  *        SYSCLK(Hz)                             | 8000000

  *-----------------------------------------------------------------------------

  *        HCLK(Hz)                               | 8000000

  *-----------------------------------------------------------------------------

  *        AHB Prescaler                          | 1

  *-----------------------------------------------------------------------------

  *        APB1 Prescaler                         | 1

  *-----------------------------------------------------------------------------

  *=============================================================================

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>

  *

  * Redistribution and use in source and binary forms, with or without modification,

  * are permitted provided that the following conditions are met:

  *   1. Redistributions of source code must retain the above copyright notice,

  *      this list of conditions and the following disclaimer.

  *   2. Redistributions in binary form must reproduce the above copyright notice,

  *      this list of conditions and the following disclaimer in the documentation

  *      and/or other materials provided with the distribution.

  *   3. Neither the name of STMicroelectronics nor the names of its contributors

  *      may be used to endorse or promote products derived from this software

  *      without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

  ******************************************************************************

  */

/** @addtogroup CMSIS

  * @{

  */

/** @addtogroup stm32f0xx_system

  * @{

  */

/** @addtogroup STM32F0xx_System_Private_Includes

  * @{

  */

#include "stm32f0xx.h"

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_TypesDefinitions

  * @{

  */

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_Defines

  * @{

  */

#if !defined  (HSE_VALUE)

  #define HSE_VALUE    ((uint32_t)16000000) /*!< Default value of the External oscillator in Hz.

						This value can be provided and adapted by the user application. */

#endif /* HSE_VALUE */

#if !defined  (HSI_VALUE)

  #define HSI_VALUE    ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz.

						This value can be provided and adapted by the user application. */

#endif /* HSI_VALUE */

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_Macros

  * @{

  */

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_Variables

  * @{

  */

  /* This variable is updated in three ways:

      1) by calling CMSIS function SystemCoreClockUpdate()

      2) by calling HAL API function HAL_RCC_GetHCLKFreq()

      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency

	 Note: If you use this function to configure the system clock there is no need to

	       call the 2 first functions listed above, since SystemCoreClock variable is

	       updated automatically.

  */

uint32_t SystemCoreClock = 8000000;

__IO const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes

  * @{

  */

/**

  * @}

  */

/** @addtogroup STM32F0xx_System_Private_Functions

  * @{

  */

/**

  * @brief  Setup the microcontroller system.

  *         Initialize the default HSI clock source, vector table location and the PLL configuration is reset.

  * @param  None

  * @retval None

  */

void SystemInit(void)

{

  /* Reset the RCC clock configuration to the default reset state ------------*/

  /* Set HSION bit */

  RCC->CR |= (uint32_t)0x00000001;

#if defined (STM32F051x8) || defined (STM32F058x8)

  /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0] bits */

  RCC->CFGR &= (uint32_t)0xF8FFB80C;

#else

  /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */

  RCC->CFGR &= (uint32_t)0x08FFB80C;

#endif /* STM32F051x8 or STM32F058x8 */

  /* Reset HSEON, CSSON and PLLON bits */

  RCC->CR &= (uint32_t)0xFEF6FFFF;

  /* Reset HSEBYP bit */

  RCC->CR &= (uint32_t)0xFFFBFFFF;

  /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */

  RCC->CFGR &= (uint32_t)0xFFC0FFFF;

  /* Reset PREDIV[3:0] bits */

  RCC->CFGR2 &= (uint32_t)0xFFFFFFF0;

#if defined (STM32F071xB) || defined (STM32F072xB) || defined (STM32F078xB)

  /* Reset USART2SW[1:0] USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */

  RCC->CFGR3 &= (uint32_t)0xFFFCFE2C;

#elif defined (STM32F091xC) || defined (STM32F098xx)

  /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW bits */

  RCC->CFGR3 &= (uint32_t)0xFFF0FFAC;

#else

  /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW  and ADCSW bits */

  RCC->CFGR3 &= (uint32_t)0xFFFFFE2C;

#endif

  /* Reset HSI14 bit */

  RCC->CR2 &= (uint32_t)0xFFFFFFFE;

  /* Disable all interrupts */

  RCC->CIR = 0x00000000;

}

/**

   * @brief  Update SystemCoreClock variable according to Clock Register Values.

  *         The SystemCoreClock variable contains the core clock (HCLK), it can

  *         be used by the user application to setup the SysTick timer or configure

  *         other parameters.

  *

  * @note   Each time the core clock (HCLK) changes, this function must be called

  *         to update SystemCoreClock variable value. Otherwise, any configuration

  *         based on this variable will be incorrect.

  *

  * @note   - The system frequency computed by this function is not the real

  *           frequency in the chip. It is calculated based on the predefined

  *           constant and the selected clock source:

  *

  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)

  *

  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)

  *

  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)

  *             or HSI_VALUE(*) multiplied/divided by the PLL factors.

  *

  *         (*) HSI_VALUE is a constant defined in stm32f0xx_hal.h file (default value

  *             8 MHz) but the real value may vary depending on the variations

  *             in voltage and temperature.

  *

  *         (**) HSE_VALUE is a constant defined in stm32f0xx_hal.h file (default value

  *              8 MHz), user has to ensure that HSE_VALUE is same as the real

  *              frequency of the crystal used. Otherwise, this function may

  *              have wrong result.

  *

  *         - The result of this function could be not correct when using fractional

  *           value for HSE crystal.

  *

  * @param  None

  * @retval None

  */

void SystemCoreClockUpdate (void)

{

  uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0;

  /* Get SYSCLK source -------------------------------------------------------*/

  tmp = RCC->CFGR & RCC_CFGR_SWS;

  switch (tmp)

  {

    case RCC_CFGR_SWS_HSI:  /* HSI used as system clock */

      SystemCoreClock = HSI_VALUE;

      break;

    case RCC_CFGR_SWS_HSE:  /* HSE used as system clock */

      SystemCoreClock = HSE_VALUE;

      break;

    case RCC_CFGR_SWS_PLL:  /* PLL used as system clock */

      /* Get PLL clock source and multiplication factor ----------------------*/

      pllmull = RCC->CFGR & RCC_CFGR_PLLMUL;

      pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;

      pllmull = ( pllmull >> 18) + 2;

      predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1;

      if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV)

      {

	/* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */

	SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull;

      }

#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)

      else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV)

      {

	/* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */

	SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull;

      }

#endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */

      else

      {

#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F071xB) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)

	/* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */

	SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull;

#else

	/* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */

	SystemCoreClock = (HSI_VALUE >> 1) * pllmull;

#endif /* STM32F042x6 || STM32F048xx || STM32F071xB || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */

      }

      break;

    default: /* HSI used as system clock */