449 lines
16 KiB
C
449 lines
16 KiB
C
/**
|
|
******************************************************************************
|
|
* @file system_stm32f1xx.c
|
|
* @author MCD Application Team
|
|
* @version V4.2.0
|
|
* @date 31-March-2017
|
|
* @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
|
|
*
|
|
* 1. This file provides two functions and one global variable to be called from
|
|
* user application:
|
|
* - SystemInit(): Setups the system clock (System clock source, PLL Multiplier
|
|
* factors, AHB/APBx prescalers and Flash settings).
|
|
* This function is called at startup just after reset and
|
|
* before branch to main program. This call is made inside
|
|
* the "startup_stm32f1xx_xx.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_stm32f1xx_xx.s" file, to
|
|
* configure the system clock before to branch to main program.
|
|
*
|
|
* 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depending on
|
|
* the product used), refer to "HSE_VALUE".
|
|
* When HSE is used as system clock source, directly or through PLL, and you
|
|
* are using different crystal you have to adapt the HSE value to your own
|
|
* configuration.
|
|
*
|
|
******************************************************************************
|
|
* @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 stm32f1xx_system
|
|
* @{
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_Includes
|
|
* @{
|
|
*/
|
|
|
|
#include "stm32f1xx.h"
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_TypesDefinitions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_Defines
|
|
* @{
|
|
*/
|
|
|
|
#if !defined (HSE_VALUE)
|
|
#define HSE_VALUE 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 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 */
|
|
#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
|
|
/* #define DATA_IN_ExtSRAM */
|
|
#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
|
|
|
|
/*!< Uncomment the following line if you need to relocate your vector Table in
|
|
Internal SRAM. */
|
|
/* #define VECT_TAB_SRAM */
|
|
#define VECT_TAB_OFFSET 0x00000000U /*!< Vector Table base offset field.
|
|
This value must be a multiple of 0x200. */
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_Macros
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_Variables
|
|
* @{
|
|
*/
|
|
|
|
/*******************************************************************************
|
|
* Clock Definitions
|
|
*******************************************************************************/
|
|
#if defined(STM32F100xB) ||defined(STM32F100xE)
|
|
uint32_t SystemCoreClock = 24000000U; /*!< System Clock Frequency (Core Clock) */
|
|
#else /*!< HSI Selected as System Clock source */
|
|
uint32_t SystemCoreClock = 72000000U; /*!< System Clock Frequency (Core Clock) */
|
|
#endif
|
|
|
|
const uint8_t AHBPrescTable[16U] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
|
|
const uint8_t APBPrescTable[8U] = {0, 0, 0, 0, 1, 2, 3, 4};
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_FunctionPrototypes
|
|
* @{
|
|
*/
|
|
|
|
#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
|
|
#ifdef DATA_IN_ExtSRAM
|
|
static void SystemInit_ExtMemCtl(void);
|
|
#endif /* DATA_IN_ExtSRAM */
|
|
#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/** @addtogroup STM32F1xx_System_Private_Functions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* @brief Setup the microcontroller system
|
|
* Initialize the Embedded Flash Interface, the PLL and update the
|
|
* SystemCoreClock variable.
|
|
* @note This function should be used only after reset.
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemInit (void)
|
|
{
|
|
/* Reset the RCC clock configuration to the default reset state(for debug purpose) */
|
|
/* Set HSION bit */
|
|
RCC->CR |= 0x00000001U;
|
|
|
|
/* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
|
|
#if !defined(STM32F105xC) && !defined(STM32F107xC)
|
|
RCC->CFGR &= 0xF8FF0000U;
|
|
#else
|
|
RCC->CFGR &= 0xF0FF0000U;
|
|
#endif /* STM32F105xC */
|
|
|
|
/* Reset HSEON, CSSON and PLLON bits */
|
|
RCC->CR &= 0xFEF6FFFFU;
|
|
|
|
/* Reset HSEBYP bit */
|
|
RCC->CR &= 0xFFFBFFFFU;
|
|
|
|
/* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
|
|
RCC->CFGR &= 0xFF80FFFFU;
|
|
|
|
#if defined(STM32F105xC) || defined(STM32F107xC)
|
|
/* Reset PLL2ON and PLL3ON bits */
|
|
RCC->CR &= 0xEBFFFFFFU;
|
|
|
|
/* Disable all interrupts and clear pending bits */
|
|
RCC->CIR = 0x00FF0000U;
|
|
|
|
/* Reset CFGR2 register */
|
|
RCC->CFGR2 = 0x00000000U;
|
|
#elif defined(STM32F100xB) || defined(STM32F100xE)
|
|
/* Disable all interrupts and clear pending bits */
|
|
RCC->CIR = 0x009F0000U;
|
|
|
|
/* Reset CFGR2 register */
|
|
RCC->CFGR2 = 0x00000000U;
|
|
#else
|
|
/* Disable all interrupts and clear pending bits */
|
|
RCC->CIR = 0x009F0000U;
|
|
#endif /* STM32F105xC */
|
|
|
|
#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
|
|
#ifdef DATA_IN_ExtSRAM
|
|
SystemInit_ExtMemCtl();
|
|
#endif /* DATA_IN_ExtSRAM */
|
|
#endif
|
|
|
|
#ifdef VECT_TAB_SRAM
|
|
SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
|
|
#else
|
|
SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @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 by the PLL factors.
|
|
*
|
|
* (*) HSI_VALUE is a constant defined in stm32f1xx.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 stm32f1xx.h file (default value
|
|
* 8 MHz or 25 MHz, depending on the product used), 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 = 0U, pllmull = 0U, pllsource = 0U;
|
|
|
|
#if defined(STM32F105xC) || defined(STM32F107xC)
|
|
uint32_t prediv1source = 0U, prediv1factor = 0U, prediv2factor = 0U, pll2mull = 0U;
|
|
#endif /* STM32F105xC */
|
|
|
|
#if defined(STM32F100xB) || defined(STM32F100xE)
|
|
uint32_t prediv1factor = 0U;
|
|
#endif /* STM32F100xB or STM32F100xE */
|
|
|
|
/* Get SYSCLK source -------------------------------------------------------*/
|
|
tmp = RCC->CFGR & RCC_CFGR_SWS;
|
|
|
|
switch (tmp)
|
|
{
|
|
case 0x00U: /* HSI used as system clock */
|
|
SystemCoreClock = HSI_VALUE;
|
|
break;
|
|
case 0x04U: /* HSE used as system clock */
|
|
SystemCoreClock = HSE_VALUE;
|
|
break;
|
|
case 0x08U: /* PLL used as system clock */
|
|
|
|
/* Get PLL clock source and multiplication factor ----------------------*/
|
|
pllmull = RCC->CFGR & RCC_CFGR_PLLMULL;
|
|
pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
|
|
|
|
#if !defined(STM32F105xC) && !defined(STM32F107xC)
|
|
pllmull = ( pllmull >> 18U) + 2U;
|
|
|
|
if (pllsource == 0x00U)
|
|
{
|
|
/* HSI oscillator clock divided by 2 selected as PLL clock entry */
|
|
SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
|
|
}
|
|
else
|
|
{
|
|
#if defined(STM32F100xB) || defined(STM32F100xE)
|
|
prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
|
|
/* HSE oscillator clock selected as PREDIV1 clock entry */
|
|
SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
|
|
#else
|
|
/* HSE selected as PLL clock entry */
|
|
if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET)
|
|
{/* HSE oscillator clock divided by 2 */
|
|
SystemCoreClock = (HSE_VALUE >> 1U) * pllmull;
|
|
}
|
|
else
|
|
{
|
|
SystemCoreClock = HSE_VALUE * pllmull;
|
|
}
|
|
#endif
|
|
}
|
|
#else
|
|
pllmull = pllmull >> 18U;
|
|
|
|
if (pllmull != 0x0DU)
|
|
{
|
|
pllmull += 2U;
|
|
}
|
|
else
|
|
{ /* PLL multiplication factor = PLL input clock * 6.5 */
|
|
pllmull = 13U / 2U;
|
|
}
|
|
|
|
if (pllsource == 0x00U)
|
|
{
|
|
/* HSI oscillator clock divided by 2 selected as PLL clock entry */
|
|
SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
|
|
}
|
|
else
|
|
{/* PREDIV1 selected as PLL clock entry */
|
|
|
|
/* Get PREDIV1 clock source and division factor */
|
|
prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC;
|
|
prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
|
|
|
|
if (prediv1source == 0U)
|
|
{
|
|
/* HSE oscillator clock selected as PREDIV1 clock entry */
|
|
SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;
|
|
}
|
|
else
|
|
{/* PLL2 clock selected as PREDIV1 clock entry */
|
|
|
|
/* Get PREDIV2 division factor and PLL2 multiplication factor */
|
|
prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4U) + 1U;
|
|
pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8U) + 2U;
|
|
SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull;
|
|
}
|
|
}
|
|
#endif /* STM32F105xC */
|
|
break;
|
|
|
|
default:
|
|
SystemCoreClock = HSI_VALUE;
|
|
break;
|
|
}
|
|
|
|
/* Compute HCLK clock frequency ----------------*/
|
|
/* Get HCLK prescaler */
|
|
tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)];
|
|
/* HCLK clock frequency */
|
|
SystemCoreClock >>= tmp;
|
|
}
|
|
|
|
#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
|
|
/**
|
|
* @brief Setup the external memory controller. Called in startup_stm32f1xx.s
|
|
* before jump to __main
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
#ifdef DATA_IN_ExtSRAM
|
|
/**
|
|
* @brief Setup the external memory controller.
|
|
* Called in startup_stm32f1xx_xx.s/.c before jump to main.
|
|
* This function configures the external SRAM mounted on STM3210E-EVAL
|
|
* board (STM32 High density devices). This SRAM will be used as program
|
|
* data memory (including heap and stack).
|
|
* @param None
|
|
* @retval None
|
|
*/
|
|
void SystemInit_ExtMemCtl(void)
|
|
{
|
|
__IO uint32_t tmpreg;
|
|
/*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is
|
|
required, then adjust the Register Addresses */
|
|
|
|
/* Enable FSMC clock */
|
|
RCC->AHBENR = 0x00000114U;
|
|
|
|
/* Delay after an RCC peripheral clock enabling */
|
|
tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN);
|
|
|
|
/* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
|
|
RCC->APB2ENR = 0x000001E0U;
|
|
|
|
/* Delay after an RCC peripheral clock enabling */
|
|
tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_IOPDEN);
|
|
|
|
(void)(tmpreg);
|
|
|
|
/* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/
|
|
/*---------------- SRAM Address lines configuration -------------------------*/
|
|
/*---------------- NOE and NWE configuration --------------------------------*/
|
|
/*---------------- NE3 configuration ----------------------------------------*/
|
|
/*---------------- NBL0, NBL1 configuration ---------------------------------*/
|
|
|
|
GPIOD->CRL = 0x44BB44BBU;
|
|
GPIOD->CRH = 0xBBBBBBBBU;
|
|
|
|
GPIOE->CRL = 0xB44444BBU;
|
|
GPIOE->CRH = 0xBBBBBBBBU;
|
|
|
|
GPIOF->CRL = 0x44BBBBBBU;
|
|
GPIOF->CRH = 0xBBBB4444U;
|
|
|
|
GPIOG->CRL = 0x44BBBBBBU;
|
|
GPIOG->CRH = 0x444B4B44U;
|
|
|
|
/*---------------- FSMC Configuration ---------------------------------------*/
|
|
/*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/
|
|
|
|
FSMC_Bank1->BTCR[4U] = 0x00001091U;
|
|
FSMC_Bank1->BTCR[5U] = 0x00110212U;
|
|
}
|
|
#endif /* DATA_IN_ExtSRAM */
|
|
#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|