| /** |
| ****************************************************************************** |
| * @file system_stm32l1xx.c |
| * @author MCD Application Team |
| * @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File. |
| * |
| * 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_stm32l1xx.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. |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * <h2><center>© COPYRIGHT(c) 2017 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 stm32l1xx_system |
| * @{ |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_Includes |
| * @{ |
| */ |
| |
| #include "stm32l1xx.h" |
| #include "mcu/cmsis_nvic.h" |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_TypesDefinitions |
| * @{ |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_Defines |
| * @{ |
| */ |
| #if !defined (HSE_VALUE) |
| #define HSE_VALUE ((uint32_t)8000000U) /*!< 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)8000000U) /*!< Default value of the Internal oscillator in Hz. |
| This value can be provided and adapted by the user application. */ |
| #endif /* HSI_VALUE */ |
| |
| /*!< Uncomment the following line if you need to use external SRAM mounted |
| on STM32L152D_EVAL board as data memory */ |
| /* #define DATA_IN_ExtSRAM */ |
| |
| /*!< Uncomment the following line if you need to relocate your vector Table in |
| Internal SRAM. */ |
| /* #define VECT_TAB_SRAM */ |
| #define VECT_TAB_OFFSET 0x00U /*!< Vector Table base offset field. |
| This value must be a multiple of 0x200. */ |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_Macros |
| * @{ |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_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; then there |
| is no need to call the 2 first functions listed above, since SystemCoreClock |
| variable is updated automatically. |
| */ |
| uint32_t SystemCoreClock = 32000000; |
| const uint8_t PLLMulTable[9] = {3U, 4U, 6U, 8U, 12U, 16U, 24U, 32U, 48U}; |
| const uint8_t AHBPrescTable[16] = {0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U, 6U, 7U, 8U, 9U}; |
| const uint8_t APBPrescTable[8] = {0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U}; |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_FunctionPrototypes |
| * @{ |
| */ |
| |
| #if defined (STM32L151xD) || defined (STM32L152xD) || defined (STM32L162xD) |
| #ifdef DATA_IN_ExtSRAM |
| static void SystemInit_ExtMemCtl(void); |
| #endif /* DATA_IN_ExtSRAM */ |
| #endif /* STM32L151xD || STM32L152xD || STM32L162xD */ |
| |
| /** |
| * @} |
| */ |
| |
| /** @addtogroup STM32L1xx_System_Private_Functions |
| * @{ |
| */ |
| |
| /** |
| * @brief Setup the microcontroller system. |
| * Initialize the Embedded Flash Interface, the PLL and update the |
| * SystemCoreClock variable. |
| * @param None |
| * @retval None |
| */ |
| void SystemInit (void) |
| { |
| /*!< Set MSION bit */ |
| RCC->CR |= (uint32_t)0x00000100; |
| |
| /*!< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */ |
| RCC->CFGR &= (uint32_t)0x88FFC00C; |
| |
| /*!< Reset HSION, HSEON, CSSON and PLLON bits */ |
| RCC->CR &= (uint32_t)0xEEFEFFFE; |
| |
| /*!< Reset HSEBYP bit */ |
| RCC->CR &= (uint32_t)0xFFFBFFFF; |
| |
| /*!< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */ |
| RCC->CFGR &= (uint32_t)0xFF02FFFF; |
| |
| /*!< Disable all interrupts */ |
| RCC->CIR = 0x00000000; |
| |
| #ifdef DATA_IN_ExtSRAM |
| SystemInit_ExtMemCtl(); |
| #endif /* DATA_IN_ExtSRAM */ |
| |
| /* Relocate the vector table */ |
| NVIC_Relocate(); |
| } |
| |
| /** |
| * @brief Update SystemCoreClock 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 MSI, SystemCoreClock will contain the MSI |
| * value as defined by the MSI range. |
| * |
| * - 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 stm32l1xx.h file (default value |
| * 16 MHz) but the real value may vary depending on the variations |
| * in voltage and temperature. |
| * |
| * (**) HSE_VALUE is a constant defined in stm32l1xx.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, pllmul = 0, plldiv = 0, pllsource = 0, msirange = 0; |
| |
| /* Get SYSCLK source -------------------------------------------------------*/ |
| tmp = RCC->CFGR & RCC_CFGR_SWS; |
| |
| switch (tmp) |
| { |
| case 0x00: /* MSI used as system clock */ |
| msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13; |
| SystemCoreClock = (32768 * (1 << (msirange + 1))); |
| break; |
| case 0x04: /* HSI used as system clock */ |
| SystemCoreClock = HSI_VALUE; |
| break; |
| case 0x08: /* HSE used as system clock */ |
| SystemCoreClock = HSE_VALUE; |
| break; |
| case 0x0C: /* PLL used as system clock */ |
| /* Get PLL clock source and multiplication factor ----------------------*/ |
| pllmul = RCC->CFGR & RCC_CFGR_PLLMUL; |
| plldiv = RCC->CFGR & RCC_CFGR_PLLDIV; |
| pllmul = PLLMulTable[(pllmul >> 18)]; |
| plldiv = (plldiv >> 22) + 1; |
| |
| pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; |
| |
| if (pllsource == 0x00) |
| { |
| /* HSI oscillator clock selected as PLL clock entry */ |
| SystemCoreClock = (((HSI_VALUE) * pllmul) / plldiv); |
| } |
| else |
| { |
| /* HSE selected as PLL clock entry */ |
| SystemCoreClock = (((HSE_VALUE) * pllmul) / plldiv); |
| } |
| break; |
| default: /* MSI used as system clock */ |
| msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13; |
| SystemCoreClock = (32768 * (1 << (msirange + 1))); |
| break; |
| } |
| /* Compute HCLK clock frequency --------------------------------------------*/ |
| /* Get HCLK prescaler */ |
| tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; |
| /* HCLK clock frequency */ |
| SystemCoreClock >>= tmp; |
| } |
| |
| #if defined (STM32L151xD) || defined (STM32L152xD) || defined (STM32L162xD) |
| #ifdef DATA_IN_ExtSRAM |
| /** |
| * @brief Setup the external memory controller. |
| * Called in SystemInit() function before jump to main. |
| * This function configures the external SRAM mounted on STM32L152D_EVAL board |
| * This SRAM will be used as program data memory (including heap and stack). |
| * @param None |
| * @retval None |
| */ |
| void SystemInit_ExtMemCtl(void) |
| { |
| /*-- GPIOs Configuration -----------------------------------------------------*/ |
| /* |
| +-------------------+--------------------+------------------+------------------+ |
| + SRAM pins assignment + |
| +-------------------+--------------------+------------------+------------------+ |
| | PD0 <-> FSMC_D2 | PE0 <-> FSMC_NBL0 | PF0 <-> FSMC_A0 | PG0 <-> FSMC_A10 | |
| | PD1 <-> FSMC_D3 | PE1 <-> FSMC_NBL1 | PF1 <-> FSMC_A1 | PG1 <-> FSMC_A11 | |
| | PD4 <-> FSMC_NOE | PE7 <-> FSMC_D4 | PF2 <-> FSMC_A2 | PG2 <-> FSMC_A12 | |
| | PD5 <-> FSMC_NWE | PE8 <-> FSMC_D5 | PF3 <-> FSMC_A3 | PG3 <-> FSMC_A13 | |
| | PD8 <-> FSMC_D13 | PE9 <-> FSMC_D6 | PF4 <-> FSMC_A4 | PG4 <-> FSMC_A14 | |
| | PD9 <-> FSMC_D14 | PE10 <-> FSMC_D7 | PF5 <-> FSMC_A5 | PG5 <-> FSMC_A15 | |
| | PD10 <-> FSMC_D15 | PE11 <-> FSMC_D8 | PF12 <-> FSMC_A6 | PG10<-> FSMC_NE2 | |
| | PD11 <-> FSMC_A16 | PE12 <-> FSMC_D9 | PF13 <-> FSMC_A7 |------------------+ |
| | PD12 <-> FSMC_A17 | PE13 <-> FSMC_D10 | PF14 <-> FSMC_A8 | |
| | PD13 <-> FSMC_A18 | PE14 <-> FSMC_D11 | PF15 <-> FSMC_A9 | |
| | PD14 <-> FSMC_D0 | PE15 <-> FSMC_D12 |------------------+ |
| | PD15 <-> FSMC_D1 |--------------------+ |
| +-------------------+ |
| */ |
| |
| /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */ |
| RCC->AHBENR = 0x000080D8; |
| |
| /* Connect PDx pins to FSMC Alternate function */ |
| GPIOD->AFR[0] = 0x00CC00CC; |
| GPIOD->AFR[1] = 0xCCCCCCCC; |
| /* Configure PDx pins in Alternate function mode */ |
| GPIOD->MODER = 0xAAAA0A0A; |
| /* Configure PDx pins speed to 40 MHz */ |
| GPIOD->OSPEEDR = 0xFFFF0F0F; |
| /* Configure PDx pins Output type to push-pull */ |
| GPIOD->OTYPER = 0x00000000; |
| /* No pull-up, pull-down for PDx pins */ |
| GPIOD->PUPDR = 0x00000000; |
| |
| /* Connect PEx pins to FSMC Alternate function */ |
| GPIOE->AFR[0] = 0xC00000CC; |
| GPIOE->AFR[1] = 0xCCCCCCCC; |
| /* Configure PEx pins in Alternate function mode */ |
| GPIOE->MODER = 0xAAAA800A; |
| /* Configure PEx pins speed to 40 MHz */ |
| GPIOE->OSPEEDR = 0xFFFFC00F; |
| /* Configure PEx pins Output type to push-pull */ |
| GPIOE->OTYPER = 0x00000000; |
| /* No pull-up, pull-down for PEx pins */ |
| GPIOE->PUPDR = 0x00000000; |
| |
| /* Connect PFx pins to FSMC Alternate function */ |
| GPIOF->AFR[0] = 0x00CCCCCC; |
| GPIOF->AFR[1] = 0xCCCC0000; |
| /* Configure PFx pins in Alternate function mode */ |
| GPIOF->MODER = 0xAA000AAA; |
| /* Configure PFx pins speed to 40 MHz */ |
| GPIOF->OSPEEDR = 0xFF000FFF; |
| /* Configure PFx pins Output type to push-pull */ |
| GPIOF->OTYPER = 0x00000000; |
| /* No pull-up, pull-down for PFx pins */ |
| GPIOF->PUPDR = 0x00000000; |
| |
| /* Connect PGx pins to FSMC Alternate function */ |
| GPIOG->AFR[0] = 0x00CCCCCC; |
| GPIOG->AFR[1] = 0x00000C00; |
| /* Configure PGx pins in Alternate function mode */ |
| GPIOG->MODER = 0x00200AAA; |
| /* Configure PGx pins speed to 40 MHz */ |
| GPIOG->OSPEEDR = 0x00300FFF; |
| /* Configure PGx pins Output type to push-pull */ |
| GPIOG->OTYPER = 0x00000000; |
| /* No pull-up, pull-down for PGx pins */ |
| GPIOG->PUPDR = 0x00000000; |
| |
| /*-- FSMC Configuration ------------------------------------------------------*/ |
| /* Enable the FSMC interface clock */ |
| RCC->AHBENR = 0x400080D8; |
| |
| /* Configure and enable Bank1_SRAM3 */ |
| FSMC_Bank1->BTCR[4] = 0x00001011; |
| FSMC_Bank1->BTCR[5] = 0x00000300; |
| FSMC_Bank1E->BWTR[4] = 0x0FFFFFFF; |
| /* |
| Bank1_SRAM3 is configured as follow: |
| |
| p.FSMC_AddressSetupTime = 0; |
| p.FSMC_AddressHoldTime = 0; |
| p.FSMC_DataSetupTime = 3; |
| p.FSMC_BusTurnAroundDuration = 0; |
| p.FSMC_CLKDivision = 0; |
| p.FSMC_DataLatency = 0; |
| p.FSMC_AccessMode = FSMC_AccessMode_A; |
| |
| FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM3; |
| FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM; |
| FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b; |
| FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low; |
| FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState; |
| FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable; |
| FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable; |
| FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p; |
| FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p; |
| |
| FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); |
| |
| FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM3, ENABLE); |
| */ |
| |
| } |
| #endif /* DATA_IN_ExtSRAM */ |
| #endif /* STM32L151xD || STM32L152xD || STM32L162xD */ |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |
