Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F65173048
system_stm32f4xx.c
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Sat, Jun 1, 12:12
Size
20 KB
Mime Type
text/x-c
Expires
Mon, Jun 3, 12:12 (1 d, 23 h)
Engine
blob
Format
Raw Data
Handle
17893301
Attached To
R2671 HHRI-software
system_stm32f4xx.c
View Options
/**
******************************************************************************
* @file system_stm32f4xx.c
* @author MCD Application Team
* @version V1.0.1
* @date 05-June-2013
* @brief CMSIS Cortex-M4 Device Peripheral Access Layer System Source File.
* This file contains the system clock configuration for STM32F4xx devices,
* and is generated by the clock configuration tool
* stm32f4xx_Clock_Configuration_V1.0.1.xls
*
* 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
* and Divider factors, AHB/APBx prescalers and Flash settings),
* depending on the configuration made in the clock xls tool.
* This function is called at startup just after reset and
* before branch to main program. This call is made inside
* the "startup_stm32f4xx.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 (16 MHz) is used as system clock source.
* Then SystemInit() function is called, in "startup_stm32f4xx.s" file, to
* configure the system clock before to branch to main program.
*
* 3. If the system clock source selected by user fails to startup, the SystemInit()
* function will do nothing and HSI still used as system clock source. User can
* add some code to deal with this issue inside the SetSysClock() function.
*
* 4. The default value of HSE crystal is set to 25MHz, refer to "HSE_VALUE" define
* in "stm32f4xx.h" file. 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.
*
* 5. This file configures the system clock as follows:
*=============================================================================
*=============================================================================
* Supported STM32F4xx device revision | Rev A
*-----------------------------------------------------------------------------
* System Clock source | PLL (HSE)
*-----------------------------------------------------------------------------
* SYSCLK(Hz) | 168000000
*-----------------------------------------------------------------------------
* HCLK(Hz) | 168000000
*-----------------------------------------------------------------------------
* AHB Prescaler | 1
*-----------------------------------------------------------------------------
* APB1 Prescaler | 4
*-----------------------------------------------------------------------------
* APB2 Prescaler | 2
*-----------------------------------------------------------------------------
* HSE Frequency(Hz) | 8000000
*-----------------------------------------------------------------------------
* PLL_M | 8
*-----------------------------------------------------------------------------
* PLL_N | 336
*-----------------------------------------------------------------------------
* PLL_P | 2
*-----------------------------------------------------------------------------
* PLL_Q | 7
*-----------------------------------------------------------------------------
* PLLI2S_N | NA
*-----------------------------------------------------------------------------
* PLLI2S_R | NA
*-----------------------------------------------------------------------------
* I2S input clock | NA
*-----------------------------------------------------------------------------
* VDD(V) | 3.3
*-----------------------------------------------------------------------------
* Main regulator output voltage | Scale1 mode
*-----------------------------------------------------------------------------
* Flash Latency(WS) | 5
*-----------------------------------------------------------------------------
* Prefetch Buffer | OFF
*-----------------------------------------------------------------------------
* Instruction cache | ON
*-----------------------------------------------------------------------------
* Data cache | ON
*-----------------------------------------------------------------------------
* Require 48MHz for USB OTG FS, | Disabled
* SDIO and RNG clock |
*-----------------------------------------------------------------------------
*=============================================================================
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/
/** @addtogroup CMSIS
* @{
*/
/** @addtogroup stm32f4xx_system
* @{
*/
/** @addtogroup STM32F4xx_System_Private_Includes
* @{
*/
#include "stm32f4xx.h"
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_Defines
* @{
*/
/************************* Miscellaneous Configuration ************************/
/*!< Uncomment the following line if you need to use external SRAM mounted
on STM324xG_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 0x00
/*!< Vector Table base offset field.
This value must be a multiple of 0x200. */
/******************************************************************************/
/************************* PLL Parameters *************************************/
/* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N */
#define PLL_M 8
#define PLL_N 336
/* SYSCLK = PLL_VCO / PLL_P */
#define PLL_P 2
/* USB OTG FS, SDIO and RNG Clock = PLL_VCO / PLLQ */
#define PLL_Q 7
/******************************************************************************/
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_Macros
* @{
*/
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_Variables
* @{
*/
uint32_t
SystemCoreClock
=
168000000
;
__I
uint8_t
AHBPrescTable
[
16
]
=
{
0
,
0
,
0
,
0
,
0
,
0
,
0
,
0
,
1
,
2
,
3
,
4
,
6
,
7
,
8
,
9
};
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_FunctionPrototypes
* @{
*/
static
void
SetSysClock
(
void
);
#ifdef DATA_IN_ExtSRAM
static
void
SystemInit_ExtMemCtl
(
void
);
#endif
/* DATA_IN_ExtSRAM */
/**
* @}
*/
/** @addtogroup STM32F4xx_System_Private_Functions
* @{
*/
/**
* @brief Setup the microcontroller system
* Initialize the Embedded Flash Interface, the PLL and update the
* SystemFrequency variable.
* @param None
* @retval None
*/
void
SystemInit
(
void
)
{
/* FPU settings ------------------------------------------------------------*/
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB
->
CPACR
|=
((
3UL
<<
10
*
2
)
|
(
3UL
<<
11
*
2
));
/* set CP10 and CP11 Full Access */
#endif
/* Reset the RCC clock configuration to the default reset state ------------*/
/* Set HSION bit */
RCC
->
CR
|=
(
uint32_t
)
0x00000001
;
/* Reset CFGR register */
RCC
->
CFGR
=
0x00000000
;
/* Reset HSEON, CSSON and PLLON bits */
RCC
->
CR
&=
(
uint32_t
)
0xFEF6FFFF
;
/* Reset PLLCFGR register */
RCC
->
PLLCFGR
=
0x24003010
;
/* Reset HSEBYP bit */
RCC
->
CR
&=
(
uint32_t
)
0xFFFBFFFF
;
/* Disable all interrupts */
RCC
->
CIR
=
0x00000000
;
#ifdef DATA_IN_ExtSRAM
SystemInit_ExtMemCtl
();
#endif
/* DATA_IN_ExtSRAM */
/* Configure the System clock source, PLL Multiplier and Divider factors,
AHB/APBx prescalers and Flash settings ----------------------------------*/
SetSysClock
();
/* Configure the Vector Table location add offset address ------------------*/
#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/divided by the PLL factors.
*
* (*) HSI_VALUE is a constant defined in stm32f4xx.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 stm32f4xx.h file (default value
* 25 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
,
pllvco
=
0
,
pllp
=
2
,
pllsource
=
0
,
pllm
=
2
;
/* Get SYSCLK source -------------------------------------------------------*/
tmp
=
RCC
->
CFGR
&
RCC_CFGR_SWS
;
switch
(
tmp
)
{
case
0x00
:
/* HSI used as system clock source */
SystemCoreClock
=
HSI_VALUE
;
break
;
case
0x04
:
/* HSE used as system clock source */
SystemCoreClock
=
HSE_VALUE
;
break
;
case
0x08
:
/* PLL used as system clock source */
/* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N
SYSCLK = PLL_VCO / PLL_P
*/
pllsource
=
(
RCC
->
PLLCFGR
&
RCC_PLLCFGR_PLLSRC
)
>>
22
;
pllm
=
RCC
->
PLLCFGR
&
RCC_PLLCFGR_PLLM
;
if
(
pllsource
!=
0
)
{
/* HSE used as PLL clock source */
pllvco
=
(
HSE_VALUE
/
pllm
)
*
((
RCC
->
PLLCFGR
&
RCC_PLLCFGR_PLLN
)
>>
6
);
}
else
{
/* HSI used as PLL clock source */
pllvco
=
(
HSI_VALUE
/
pllm
)
*
((
RCC
->
PLLCFGR
&
RCC_PLLCFGR_PLLN
)
>>
6
);
}
pllp
=
(((
RCC
->
PLLCFGR
&
RCC_PLLCFGR_PLLP
)
>>
16
)
+
1
)
*
2
;
SystemCoreClock
=
pllvco
/
pllp
;
break
;
default:
SystemCoreClock
=
HSI_VALUE
;
break
;
}
/* Compute HCLK frequency --------------------------------------------------*/
/* Get HCLK prescaler */
tmp
=
AHBPrescTable
[((
RCC
->
CFGR
&
RCC_CFGR_HPRE
)
>>
4
)];
/* HCLK frequency */
SystemCoreClock
>>=
tmp
;
}
/**
* @brief Configures the System clock source, PLL Multiplier and Divider factors,
* AHB/APBx prescalers and Flash settings
* @Note This function should be called only once the RCC clock configuration
* is reset to the default reset state (done in SystemInit() function).
* @param None
* @retval None
*/
static
void
SetSysClock
(
void
)
{
/******************************************************************************/
/* PLL (clocked by HSE) used as System clock source */
/******************************************************************************/
__IO
uint32_t
StartUpCounter
=
0
,
HSEStatus
=
0
;
/* Enable HSE */
RCC
->
CR
|=
((
uint32_t
)
RCC_CR_HSEON
);
/* Wait till HSE is ready and if Time out is reached exit */
do
{
HSEStatus
=
RCC
->
CR
&
RCC_CR_HSERDY
;
StartUpCounter
++
;
}
while
((
HSEStatus
==
0
)
&&
(
StartUpCounter
!=
HSE_STARTUP_TIMEOUT
));
if
((
RCC
->
CR
&
RCC_CR_HSERDY
)
!=
RESET
)
{
HSEStatus
=
(
uint32_t
)
0x01
;
}
else
{
HSEStatus
=
(
uint32_t
)
0x00
;
}
if
(
HSEStatus
==
(
uint32_t
)
0x01
)
{
/* Select regulator voltage output Scale 1 mode, System frequency up to 168 MHz */
RCC
->
APB1ENR
|=
RCC_APB1ENR_PWREN
;
PWR
->
CR
|=
PWR_CR_VOS
;
/* HCLK = SYSCLK / 1*/
RCC
->
CFGR
|=
RCC_CFGR_HPRE_DIV1
;
/* PCLK2 = HCLK / 2*/
RCC
->
CFGR
|=
RCC_CFGR_PPRE2_DIV2
;
/* PCLK1 = HCLK / 4*/
RCC
->
CFGR
|=
RCC_CFGR_PPRE1_DIV4
;
/* Configure the main PLL */
RCC
->
PLLCFGR
=
PLL_M
|
(
PLL_N
<<
6
)
|
(((
PLL_P
>>
1
)
-
1
)
<<
16
)
|
(
RCC_PLLCFGR_PLLSRC_HSE
)
|
(
PLL_Q
<<
24
);
/* Enable the main PLL */
RCC
->
CR
|=
RCC_CR_PLLON
;
/* Wait till the main PLL is ready */
while
((
RCC
->
CR
&
RCC_CR_PLLRDY
)
==
0
)
{
}
/* Configure Flash prefetch, Instruction cache, Data cache and wait state */
FLASH
->
ACR
=
FLASH_ACR_ICEN
|
FLASH_ACR_DCEN
|
FLASH_ACR_LATENCY_5WS
;
/* Select the main PLL as system clock source */
RCC
->
CFGR
&=
(
uint32_t
)((
uint32_t
)
~
(
RCC_CFGR_SW
));
RCC
->
CFGR
|=
RCC_CFGR_SW_PLL
;
/* Wait till the main PLL is used as system clock source */
while
((
RCC
->
CFGR
&
(
uint32_t
)
RCC_CFGR_SWS
)
!=
RCC_CFGR_SWS_PLL
);
{
}
}
else
{
/* If HSE fails to start-up, the application will have wrong clock
configuration. User can add here some code to deal with this error */
}
}
/**
* @brief Setup the external memory controller. Called in startup_stm32f4xx.s
* before jump to __main
* @param None
* @retval None
*/
#ifdef DATA_IN_ExtSRAM
/**
* @brief Setup the external memory controller.
* Called in startup_stm32f4xx.s before jump to main.
* This function configures the external SRAM mounted on STM324xG_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 | PE3 <-> FSMC_A19 | PF2 <-> FSMC_A2 | PG2 <-> FSMC_A12 |
| PD5 <-> FSMC_NWE | PE4 <-> FSMC_A20 | PF3 <-> FSMC_A3 | PG3 <-> FSMC_A13 |
| PD8 <-> FSMC_D13 | PE7 <-> FSMC_D4 | PF4 <-> FSMC_A4 | PG4 <-> FSMC_A14 |
| PD9 <-> FSMC_D14 | PE8 <-> FSMC_D5 | PF5 <-> FSMC_A5 | PG5 <-> FSMC_A15 |
| PD10 <-> FSMC_D15 | PE9 <-> FSMC_D6 | PF12 <-> FSMC_A6 | PG9 <-> FSMC_NE2 |
| PD11 <-> FSMC_A16 | PE10 <-> FSMC_D7 | PF13 <-> FSMC_A7 |------------------+
| PD12 <-> FSMC_A17 | PE11 <-> FSMC_D8 | PF14 <-> FSMC_A8 |
| PD13 <-> FSMC_A18 | PE12 <-> FSMC_D9 | PF15 <-> FSMC_A9 |
| PD14 <-> FSMC_D0 | PE13 <-> FSMC_D10 |------------------+
| PD15 <-> FSMC_D1 | PE14 <-> FSMC_D11 |
| | PE15 <-> FSMC_D12 |
+-------------------+--------------------+
*/
/* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
RCC
->
AHB1ENR
=
0x00000078
;
/* Connect PDx pins to FSMC Alternate function */
GPIOD
->
AFR
[
0
]
=
0x00cc00cc
;
GPIOD
->
AFR
[
1
]
=
0xcc0ccccc
;
/* Configure PDx pins in Alternate function mode */
GPIOD
->
MODER
=
0xaaaa0a0a
;
/* Configure PDx pins speed to 100 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
]
=
0xc00cc0cc
;
GPIOE
->
AFR
[
1
]
=
0xcccccccc
;
/* Configure PEx pins in Alternate function mode */
GPIOE
->
MODER
=
0xaaaa828a
;
/* Configure PEx pins speed to 100 MHz */
GPIOE
->
OSPEEDR
=
0xffffc3cf
;
/* 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 100 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
]
=
0x000000c0
;
/* Configure PGx pins in Alternate function mode */
GPIOG
->
MODER
=
0x00080aaa
;
/* Configure PGx pins speed to 100 MHz */
GPIOG
->
OSPEEDR
=
0x000c0fff
;
/* 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
->
AHB3ENR
=
0x00000001
;
/* Configure and enable Bank1_SRAM2 */
FSMC_Bank1
->
BTCR
[
2
]
=
0x00001015
;
FSMC_Bank1
->
BTCR
[
3
]
=
0x00010603
;
FSMC_Bank1E
->
BWTR
[
2
]
=
0x0fffffff
;
/*
Bank1_SRAM2 is configured as follow:
p.FSMC_AddressSetupTime = 3;
p.FSMC_AddressHoldTime = 0;
p.FSMC_DataSetupTime = 6;
p.FSMC_BusTurnAroundDuration = 1;
p.FSMC_CLKDivision = 0;
p.FSMC_DataLatency = 0;
p.FSMC_AccessMode = FSMC_AccessMode_A;
FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_PSRAM;
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;
*/
}
#endif
/* DATA_IN_ExtSRAM */
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
Event Timeline
Log In to Comment