rt-thread/bsp/stm32f7-disco/drivers/board.c

/*
 * File      : board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2015, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-01-05     Bernard      first implementation
 */

#include <rthw.h>
#include <rtthread.h>
#include <components.h>

#include "board.h"
#include "drv_usart.h"
#include "drv_mpu.h"

/**
 * @addtogroup STM32
 */

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow :
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 200000000
  *            HCLK(Hz)                       = 200000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 400
  *            PLL_P                          = 2
  *            PLLSAI_N                       = 384
  *            PLLSAI_P                       = 8
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 6
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
    RCC_ClkInitTypeDef RCC_ClkInitStruct;
    RCC_OscInitTypeDef RCC_OscInitStruct;
    HAL_StatusTypeDef ret = HAL_OK;

    /* Enable HSE Oscillator and activate PLL with HSE as source */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 25;
    RCC_OscInitStruct.PLL.PLLN = 400;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);

    ret = HAL_PWREx_EnableOverDrive();

    if (ret != HAL_OK)
    {
        while (1)
        {
            ;
        }
    }

    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
       clocks dividers */
    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_6);
}

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
    /* Enable branch prediction */
    SCB->CCR |= (1 << 18);
    __DSB();

    /* Enable I-Cache */
    SCB_EnableICache();

    /* Enable D-Cache */
    SCB_EnableDCache();
}

/**
 * This is the timer interrupt service routine.
 *
 */
void SysTick_Handler(void)
{
    /* tick for HAL Library */
    HAL_IncTick();

    /* enter interrupt */
    rt_interrupt_enter();

    rt_tick_increase();

    /* leave interrupt */
    rt_interrupt_leave();
}

/**
 * This function will initial STM32 board.
 */
void rt_hw_board_init()
{
    /* Configure the MPU attributes as Write Through */
    mpu_init();

    /* Enable the CPU Cache */
    CPU_CACHE_Enable();

    /* STM32F7xx HAL library initialization:
    - Configure the Flash ART accelerator on ITCM interface
    - Configure the Systick to generate an interrupt each 1 msec
    - Set NVIC Group Priority to 4
    - Global MSP (MCU Support Package) initialization
    */
    HAL_Init();
    /* Configure the system clock @ 200 Mhz */
    SystemClock_Config();
    /* init systick */
    SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
    /* set pend exception priority */
    NVIC_SetPriority(PendSV_IRQn, (1 << __NVIC_PRIO_BITS) - 1);

    rt_components_board_init();

#ifdef RT_USING_CONSOLE
    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
}

/*@}*/