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+/**
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+ ******************************************************************************
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+ * @file system_stm32f1xx.c
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+ * @author MCD Application Team
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+ * @version V4.2.0
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+ * @date 31-March-2017
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+ * @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
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+ *
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+ * 1. This file provides two functions and one global variable to be called from
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+ * user application:
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+ * - SystemInit(): Setups the system clock (System clock source, PLL Multiplier
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+ * factors, AHB/APBx prescalers and Flash settings).
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+ * This function is called at startup just after reset and
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+ * before branch to main program. This call is made inside
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+ * the "startup_stm32f1xx_xx.s" file.
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+ *
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+ * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
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+ * by the user application to setup the SysTick
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+ * timer or configure other parameters.
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+ *
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+ * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
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+ * be called whenever the core clock is changed
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+ * during program execution.
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+ *
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+ * 2. After each device reset the HSI (8 MHz) is used as system clock source.
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+ * Then SystemInit() function is called, in "startup_stm32f1xx_xx.s" file, to
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+ * configure the system clock before to branch to main program.
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+ *
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+ * 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depending on
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+ * the product used), refer to "HSE_VALUE".
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+ * When HSE is used as system clock source, directly or through PLL, and you
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+ * are using different crystal you have to adapt the HSE value to your own
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+ * configuration.
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+ *
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+ ******************************************************************************
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+ * @attention
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+ *
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+ * <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
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+ *
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+ * Redistribution and use in source and binary forms, with or without modification,
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+ * are permitted provided that the following conditions are met:
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+ * 1. Redistributions of source code must retain the above copyright notice,
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+ * this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright notice,
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+ * this list of conditions and the following disclaimer in the documentation
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+ * and/or other materials provided with the distribution.
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+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ ******************************************************************************
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+ */
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+
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+/** @addtogroup CMSIS
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+ * @{
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+ */
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+
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+/** @addtogroup stm32f1xx_system
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+ * @{
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_Includes
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+ * @{
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+ */
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+
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+#include "stm32f1xx.h"
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_TypesDefinitions
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+ * @{
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+ */
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_Defines
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+ * @{
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+ */
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+
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+#if !defined (HSE_VALUE)
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+ #define HSE_VALUE 8000000U /*!< Default value of the External oscillator in Hz.
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+ This value can be provided and adapted by the user application. */
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+#endif /* HSE_VALUE */
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+
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+#if !defined (HSI_VALUE)
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+ #define HSI_VALUE 8000000U /*!< Default value of the Internal oscillator in Hz.
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+ This value can be provided and adapted by the user application. */
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+#endif /* HSI_VALUE */
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+
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+/*!< Uncomment the following line if you need to use external SRAM */
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+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
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+/* #define DATA_IN_ExtSRAM */
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+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
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+
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+/*!< Uncomment the following line if you need to relocate your vector Table in
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+ Internal SRAM. */
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+/* #define VECT_TAB_SRAM */
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+#define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field.
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+ This value must be a multiple of 0x200. */
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+
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_Macros
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+ * @{
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+ */
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_Variables
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+ * @{
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+ */
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+
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+/*******************************************************************************
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+* Clock Definitions
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+*******************************************************************************/
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+#if defined(STM32F100xB) ||defined(STM32F100xE)
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+ uint32_t SystemCoreClock = 24000000U; /*!< System Clock Frequency (Core Clock) */
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+#else /*!< HSI Selected as System Clock source */
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+ uint32_t SystemCoreClock = 72000000U; /*!< System Clock Frequency (Core Clock) */
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+#endif
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+
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+const uint8_t AHBPrescTable[16U] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
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+const uint8_t APBPrescTable[8U] = {0, 0, 0, 0, 1, 2, 3, 4};
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_FunctionPrototypes
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+ * @{
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+ */
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+
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+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
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+#ifdef DATA_IN_ExtSRAM
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+ static void SystemInit_ExtMemCtl(void);
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+#endif /* DATA_IN_ExtSRAM */
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+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
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+
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+/**
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+ * @}
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+ */
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+
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+/** @addtogroup STM32F1xx_System_Private_Functions
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+ * @{
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+ */
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+
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+/**
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+ * @brief Setup the microcontroller system
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+ * Initialize the Embedded Flash Interface, the PLL and update the
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+ * SystemCoreClock variable.
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+ * @note This function should be used only after reset.
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+ * @param None
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+ * @retval None
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+ */
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+void SystemInit (void)
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+{
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+ /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
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+ /* Set HSION bit */
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+ RCC->CR |= 0x00000001U;
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+
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+ /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
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+#if !defined(STM32F105xC) && !defined(STM32F107xC)
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+ RCC->CFGR &= 0xF8FF0000U;
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+#else
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+ RCC->CFGR &= 0xF0FF0000U;
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+#endif /* STM32F105xC */
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+
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+ /* Reset HSEON, CSSON and PLLON bits */
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+ RCC->CR &= 0xFEF6FFFFU;
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+
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+ /* Reset HSEBYP bit */
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+ RCC->CR &= 0xFFFBFFFFU;
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+
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+ /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
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+ RCC->CFGR &= 0xFF80FFFFU;
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+
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+#if defined(STM32F105xC) || defined(STM32F107xC)
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+ /* Reset PLL2ON and PLL3ON bits */
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+ RCC->CR &= 0xEBFFFFFFU;
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+
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+ /* Disable all interrupts and clear pending bits */
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+ RCC->CIR = 0x00FF0000U;
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+
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+ /* Reset CFGR2 register */
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+ RCC->CFGR2 = 0x00000000U;
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+#elif defined(STM32F100xB) || defined(STM32F100xE)
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+ /* Disable all interrupts and clear pending bits */
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+ RCC->CIR = 0x009F0000U;
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+
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+ /* Reset CFGR2 register */
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+ RCC->CFGR2 = 0x00000000U;
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+#else
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+ /* Disable all interrupts and clear pending bits */
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+ RCC->CIR = 0x009F0000U;
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+#endif /* STM32F105xC */
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+
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+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
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+ #ifdef DATA_IN_ExtSRAM
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+ SystemInit_ExtMemCtl();
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+ #endif /* DATA_IN_ExtSRAM */
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+#endif
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+
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+#ifdef VECT_TAB_SRAM
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+ SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
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+#else
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+ SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
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+#endif
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+}
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+
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+/**
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+ * @brief Update SystemCoreClock variable according to Clock Register Values.
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+ * The SystemCoreClock variable contains the core clock (HCLK), it can
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+ * be used by the user application to setup the SysTick timer or configure
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+ * other parameters.
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+ *
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+ * @note Each time the core clock (HCLK) changes, this function must be called
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+ * to update SystemCoreClock variable value. Otherwise, any configuration
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+ * based on this variable will be incorrect.
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+ *
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+ * @note - The system frequency computed by this function is not the real
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+ * frequency in the chip. It is calculated based on the predefined
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+ * constant and the selected clock source:
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+ *
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+ * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
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+ *
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+ * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
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+ *
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+ * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
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+ * or HSI_VALUE(*) multiplied by the PLL factors.
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+ *
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+ * (*) HSI_VALUE is a constant defined in stm32f1xx.h file (default value
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+ * 8 MHz) but the real value may vary depending on the variations
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+ * in voltage and temperature.
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+ *
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+ * (**) HSE_VALUE is a constant defined in stm32f1xx.h file (default value
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+ * 8 MHz or 25 MHz, depending on the product used), user has to ensure
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+ * that HSE_VALUE is same as the real frequency of the crystal used.
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+ * Otherwise, this function may have wrong result.
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+ *
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+ * - The result of this function could be not correct when using fractional
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+ * value for HSE crystal.
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+ * @param None
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+ * @retval None
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+ */
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+void SystemCoreClockUpdate (void)
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+{
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+ uint32_t tmp = 0U, pllmull = 0U, pllsource = 0U;
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+
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+#if defined(STM32F105xC) || defined(STM32F107xC)
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+ uint32_t prediv1source = 0U, prediv1factor = 0U, prediv2factor = 0U, pll2mull = 0U;
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+#endif /* STM32F105xC */
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+
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+#if defined(STM32F100xB) || defined(STM32F100xE)
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+ uint32_t prediv1factor = 0U;
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+#endif /* STM32F100xB or STM32F100xE */
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+
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+ /* Get SYSCLK source -------------------------------------------------------*/
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+ tmp = RCC->CFGR & RCC_CFGR_SWS;
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+
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+ switch (tmp)
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+ {
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+ case 0x00U: /* HSI used as system clock */
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+ SystemCoreClock = HSI_VALUE;
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+ break;
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+ case 0x04U: /* HSE used as system clock */
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+ SystemCoreClock = HSE_VALUE;
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+ break;
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+ case 0x08U: /* PLL used as system clock */
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+
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+ /* Get PLL clock source and multiplication factor ----------------------*/
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+ pllmull = RCC->CFGR & RCC_CFGR_PLLMULL;
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+ pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
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+
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+#if !defined(STM32F105xC) && !defined(STM32F107xC)
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+ pllmull = ( pllmull >> 18U) + 2U;
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+
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+ if (pllsource == 0x00U)
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+ {
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+ /* HSI oscillator clock divided by 2 selected as PLL clock entry */
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+ SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
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+ }
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+ else
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+ {
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+ #if defined(STM32F100xB) || defined(STM32F100xE)
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+ prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
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+ /* HSE oscillator clock selected as PREDIV1 clock entry */
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+ SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
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+ #else
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+ /* HSE selected as PLL clock entry */
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+ if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET)
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+ {/* HSE oscillator clock divided by 2 */
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+ SystemCoreClock = (HSE_VALUE >> 1U) * pllmull;
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+ }
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+ else
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+ {
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+ SystemCoreClock = HSE_VALUE * pllmull;
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+ }
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+ #endif
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+ }
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+#else
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+ pllmull = pllmull >> 18U;
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+
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+ if (pllmull != 0x0DU)
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+ {
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+ pllmull += 2U;
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+ }
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+ else
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+ { /* PLL multiplication factor = PLL input clock * 6.5 */
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+ pllmull = 13U / 2U;
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+ }
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+
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+ if (pllsource == 0x00U)
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+ {
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+ /* HSI oscillator clock divided by 2 selected as PLL clock entry */
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+ SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
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+ }
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+ else
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+ {/* PREDIV1 selected as PLL clock entry */
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+
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+ /* Get PREDIV1 clock source and division factor */
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+ prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC;
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+ prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
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+
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+ if (prediv1source == 0U)
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+ {
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+ /* HSE oscillator clock selected as PREDIV1 clock entry */
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+ SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
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+ }
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+ else
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+ {/* PLL2 clock selected as PREDIV1 clock entry */
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+
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+ /* Get PREDIV2 division factor and PLL2 multiplication factor */
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+ prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4U) + 1U;
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+ pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8U) + 2U;
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+ SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull;
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+ }
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+ }
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+#endif /* STM32F105xC */
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+ break;
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+
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+ default:
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+ SystemCoreClock = HSI_VALUE;
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+ break;
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+ }
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+
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+ /* Compute HCLK clock frequency ----------------*/
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+ /* Get HCLK prescaler */
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+ tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)];
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+ /* HCLK clock frequency */
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+ SystemCoreClock >>= tmp;
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+}
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+
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+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
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+/**
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+ * @brief Setup the external memory controller. Called in startup_stm32f1xx.s
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+ * before jump to __main
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+ * @param None
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+ * @retval None
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+ */
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+#ifdef DATA_IN_ExtSRAM
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+/**
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+ * @brief Setup the external memory controller.
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+ * Called in startup_stm32f1xx_xx.s/.c before jump to main.
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+ * This function configures the external SRAM mounted on STM3210E-EVAL
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+ * board (STM32 High density devices). This SRAM will be used as program
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+ * data memory (including heap and stack).
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+ * @param None
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+ * @retval None
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|
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+ */
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+void SystemInit_ExtMemCtl(void)
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+{
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+ __IO uint32_t tmpreg;
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+ /*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is
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|
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+ required, then adjust the Register Addresses */
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+
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+ /* Enable FSMC clock */
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+ RCC->AHBENR = 0x00000114U;
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+
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|
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+ /* Delay after an RCC peripheral clock enabling */
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+ tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN);
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+
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|
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+ /* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
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|
+ RCC->APB2ENR = 0x000001E0U;
|
|
|
+
|
|
|
+ /* Delay after an RCC peripheral clock enabling */
|
|
|
+ tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_IOPDEN);
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+
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+ (void)(tmpreg);
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+
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|
|
+/* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/
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|
|
+/*---------------- SRAM Address lines configuration -------------------------*/
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|
|
+/*---------------- NOE and NWE configuration --------------------------------*/
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|
|
+/*---------------- NE3 configuration ----------------------------------------*/
|
|
|
+/*---------------- NBL0, NBL1 configuration ---------------------------------*/
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|
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+
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|
|
+ GPIOD->CRL = 0x44BB44BBU;
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|
|
+ GPIOD->CRH = 0xBBBBBBBBU;
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|
|
+
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|
|
+ GPIOE->CRL = 0xB44444BBU;
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|
|
+ GPIOE->CRH = 0xBBBBBBBBU;
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|
|
+
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|
|
+ GPIOF->CRL = 0x44BBBBBBU;
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|
|
+ GPIOF->CRH = 0xBBBB4444U;
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|
|
+
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|
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+ GPIOG->CRL = 0x44BBBBBBU;
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|
|
+ GPIOG->CRH = 0x444B4B44U;
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|
|
+
|
|
|
+/*---------------- FSMC Configuration ---------------------------------------*/
|
|
|
+/*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/
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|
|
+
|
|
|
+ FSMC_Bank1->BTCR[4U] = 0x00001091U;
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|
|
+ FSMC_Bank1->BTCR[5U] = 0x00110212U;
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|
|
+}
|
|
|
+#endif /* DATA_IN_ExtSRAM */
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|
|
+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
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|
|
+
|
|
|
+/**
|
|
|
+ * @}
|
|
|
+ */
|
|
|
+
|
|
|
+/**
|
|
|
+ * @}
|
|
|
+ */
|
|
|
+
|
|
|
+/**
|
|
|
+ * @}
|
|
|
+ */
|
|
|
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|