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/**
******************************************************************************
* @file Examples_LL/CORTEX/CORTEX_MPU/Src/main.c
* @author MCD Application Team
* @brief This example presents the MPU features through
* the STM32F4xx CORTEX LL API.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup CORTEX_MPU
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ARRAY_ADDRESS_START (0x20002000UL)
#define ARRAY_SIZE LL_MPU_REGION_SIZE_32B
#define ARRAY_REGION_NUMBER LL_MPU_REGION_NUMBER3
#define EXAMPLE_RAM_ADDRESS_START (0x20000000UL)
#define EXAMPLE_RAM_SIZE LL_MPU_REGION_SIZE_32KB
#define EXAMPLE_PERIPH_ADDRESS_START (0x40000000)
#define EXAMPLE_PERIPH_SIZE LL_MPU_REGION_SIZE_512MB
#define EXAMPLE_FLASH_ADDRESS_START (0x08000000)
#define EXAMPLE_FLASH_SIZE LL_MPU_REGION_SIZE_256KB
#define EXAMPLE_RAM_REGION_NUMBER LL_MPU_REGION_NUMBER0
#define EXAMPLE_FLASH_REGION_NUMBER LL_MPU_REGION_NUMBER1
#define EXAMPLE_PERIPH_REGION_NUMBER LL_MPU_REGION_NUMBER2
#define portMPU_REGION_READ_WRITE LL_MPU_REGION_FULL_ACCESS
#define portMPU_REGION_PRIVILEGED_READ_ONLY LL_MPU_REGION_PRIV_RO
#define portMPU_REGION_READ_ONLY LL_MPU_REGION_PRIV_RO_URO
#define portMPU_REGION_PRIVILEGED_READ_WRITE LL_MPU_REGION_PRIV_RW
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
const uint16_t GPIO_PIN[LEDn] = {LED1_PIN, LED2_PIN, LED3_PIN};
#if defined ( __CC_ARM )
uint8_t PrivilegedReadOnlyArray[32] __attribute__((at(0x20002000)));
#elif defined ( __ICCARM__ )
#pragma location=0x20002000
__no_init uint8_t PrivilegedReadOnlyArray[32];
#elif defined ( __GNUC__ )
uint8_t PrivilegedReadOnlyArray[32] __attribute__((section(".ROarraySection")));
#endif
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_MPU(void);
void MPU_AccessPermConfig(void);
void LED_Init(void);
void LED_Blinking(uint32_t Period, Led_TypeDef Led);
void UserButton_Init(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Configure LED1 and LED3 */
LED_Init();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Set MPU regions */
Configure_MPU();
MPU_AccessPermConfig();
/* Toggle quickly the LED in waiting for User-button press */
LED_Blinking(LED_BLINK_FAST, LED1);
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Configures the main MPU regions.
* @param None
* @retval None
*/
void Configure_MPU(void)
{
/* Disable MPU */
LL_MPU_Disable();
/* Configure RAM region as Region N�0, 32KB of size and R/W region */
LL_MPU_ConfigRegion(EXAMPLE_RAM_REGION_NUMBER, 0x00, EXAMPLE_RAM_ADDRESS_START,
EXAMPLE_RAM_SIZE | portMPU_REGION_READ_WRITE | LL_MPU_ACCESS_NOT_BUFFERABLE |
LL_MPU_ACCESS_NOT_CACHEABLE | LL_MPU_ACCESS_NOT_SHAREABLE | LL_MPU_TEX_LEVEL0 |
LL_MPU_INSTRUCTION_ACCESS_ENABLE);
/* Configure FLASH region as REGION N�1, 256KB of size and R/W region */
LL_MPU_ConfigRegion(EXAMPLE_FLASH_REGION_NUMBER, 0x00, EXAMPLE_FLASH_ADDRESS_START,
EXAMPLE_FLASH_SIZE | portMPU_REGION_READ_WRITE | LL_MPU_ACCESS_NOT_BUFFERABLE |
LL_MPU_ACCESS_NOT_CACHEABLE | LL_MPU_ACCESS_NOT_SHAREABLE | LL_MPU_TEX_LEVEL0 |
LL_MPU_INSTRUCTION_ACCESS_ENABLE);
/* Configure Peripheral region as REGION N�2, 512MB of size, R/W and Execute
Never region */
LL_MPU_ConfigRegion(EXAMPLE_PERIPH_REGION_NUMBER, 0x00, EXAMPLE_PERIPH_ADDRESS_START,
EXAMPLE_PERIPH_SIZE | portMPU_REGION_READ_WRITE | LL_MPU_ACCESS_NOT_BUFFERABLE |
LL_MPU_ACCESS_NOT_CACHEABLE | LL_MPU_ACCESS_NOT_SHAREABLE | LL_MPU_TEX_LEVEL0 |
LL_MPU_INSTRUCTION_ACCESS_DISABLE);
/* Enable MPU (any access not covered by any enabled region will cause a fault) */
LL_MPU_Enable(LL_MPU_CTRL_PRIVILEGED_DEFAULT);
}
/**
* @brief This function configures the access right using Cortex-M4 MPU regions.
* @param None
* @retval None
*/
void MPU_AccessPermConfig(void)
{
/* Configure region for PrivilegedReadOnlyArray as REGION N�3, 32byte and R
only in privileged mode */
/* Disable MPU */
LL_MPU_Disable();
LL_MPU_ConfigRegion(ARRAY_REGION_NUMBER, 0x00, ARRAY_ADDRESS_START,
ARRAY_SIZE | portMPU_REGION_PRIVILEGED_READ_ONLY | LL_MPU_ACCESS_NOT_BUFFERABLE |
LL_MPU_ACCESS_NOT_CACHEABLE | LL_MPU_ACCESS_NOT_SHAREABLE | LL_MPU_TEX_LEVEL0 |
LL_MPU_INSTRUCTION_ACCESS_ENABLE);
/* Enable MPU (any access not covered by any enabled region will cause a fault) */
LL_MPU_Enable(LL_MPU_CTRL_PRIVILEGED_DEFAULT);
LL_HANDLER_EnableFault(LL_HANDLER_FAULT_MEM);
/* Read from PrivilegedReadOnlyArray. This will not generate error */
(void)PrivilegedReadOnlyArray[0];
}
/**
* @brief Initialize LED1.
* @param None
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @retval None
*/
void LED_Init(void)
{
/* Enable the GPIO_LED Clock */
LEDx_GPIO_CLK_ENABLE();
/* Configure LED1 and LED3 */
LL_GPIO_SetPinMode(LEDx_GPIO_PORT, GPIO_PIN[LED1], LL_GPIO_MODE_OUTPUT);
LL_GPIO_SetPinMode(LEDx_GPIO_PORT, GPIO_PIN[LED3], LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LEDx_GPIO_PORT, GPIO_PIN[LED1] | GPIO_PIN[LED3], LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LEDx_GPIO_PORT, GPIO_PIN[LED1], LL_GPIO_SPEED_FREQ_LOW);
//LL_GPIO_SetPinSpeed(LEDx_GPIO_PORT, GPIO_PIN[LED3], LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LEDx_GPIO_PORT, GPIO_PIN[LED1], LL_GPIO_PULL_NO);
//LL_GPIO_SetPinPull(LEDx_GPIO_PORT, GPIO_PIN[LED3], LL_GPIO_PULL_NO);
}
/**
* @brief Set LED1 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @param Led: Specifies the Led to be configured.
* This parameter can be one of following parameters:
* @arg LED1
* @arg LED2
* @arg LED3
* @retval None
*/
void LED_Blinking(uint32_t Period, Led_TypeDef Led)
{
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LEDx_GPIO_PORT, GPIO_PIN[Led]);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in EXTI Line Mode.
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 180000000
* HCLK(Hz) = 180000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 360
* PLL_P = 2
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 5
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_5);
/* Enable PWR clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
/* Activation OverDrive Mode */
LL_PWR_EnableOverDriveMode();
while(LL_PWR_IsActiveFlag_OD() != 1)
{
};
/* Activation OverDrive Switching */
LL_PWR_EnableOverDriveSwitching();
while(LL_PWR_IsActiveFlag_ODSW() != 1)
{
};
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 360, LL_RCC_PLLP_DIV_2);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(180000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 180000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage User button IRQ Handler
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* This will generate error */
PrivilegedReadOnlyArray[0] = 'e';
}
/**
* @brief Function to manage memory exception
* @param None
* @retval None
*/
void MemManage_Callback(void)
{
/* Turn on LED3 */
LL_GPIO_SetOutputPin(LEDx_GPIO_PORT, GPIO_PIN[LED3]);
/* Turn off LED1 */
LL_GPIO_ResetOutputPin(LEDx_GPIO_PORT, GPIO_PIN[LED1]);
/* Go to infinite loop when Memory Manage exception occurs */
while (1)
{
}
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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