在NUC029SGE上移植RT-Thread Nano要点

/*

 * Copyright (c) 2006-2019, RT-Thread Development Team

 *

 * SPDX-License-Identifier: Apache-2.0

 *

 * Change Logs:

 * Date           Author       Notes

 * 2017-07-24     Tanek        the first version

 * 2018-11-12     Ernest Chen  modify copyright

 */

#include <stdio.h>

#include <stdint.h>

#include <rthw.h>

#include <rtthread.h>

//#include "uart.h"

#include "NUC029xGE.h"

#define PLL_CLOCK       72000000



#define _SCB_BASE       (0xE000E010UL)

#define _SYSTICK_CTRL   (*(rt_uint32_t *)(_SCB_BASE + 0x0))

#define _SYSTICK_LOAD   (*(rt_uint32_t *)(_SCB_BASE + 0x4))

#define _SYSTICK_VAL    (*(rt_uint32_t *)(_SCB_BASE + 0x8))

#define _SYSTICK_CALIB  (*(rt_uint32_t *)(_SCB_BASE + 0xC))

#define _SYSTICK_PRI    (*(rt_uint8_t  *)(0xE000ED23UL))



// Updates the variable SystemCoreClock and must be called 

// whenever the core clock is changed during program execution.

extern void SystemCoreClockUpdate(void);



// Holds the system core clock, which is the system clock 

// frequency supplied to the SysTick timer and the processor 

// core clock.

extern uint32_t SystemCoreClock;



static uint32_t _SysTick_Config(rt_uint32_t ticks)

{

    if ((ticks - 1) > 0xFFFFFF)

    {

        return 1;

    }

    

    _SYSTICK_LOAD = ticks - 1; 

    _SYSTICK_PRI = 0xFF;

    _SYSTICK_VAL  = 0;

    _SYSTICK_CTRL = 0x07;  

    

    return 0;

}



#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)

#define RT_HEAP_SIZE 1024

static uint32_t rt_heap[RT_HEAP_SIZE];     // heap default size: 4K(1024 * 4)

RT_WEAK void *rt_heap_begin_get(void)

{

    return rt_heap;

}



RT_WEAK void *rt_heap_end_get(void)

{

    return rt_heap + RT_HEAP_SIZE;

}

#endif

/*自己添加跟硬件有关的时钟初始化*/

static void rt_hw_system_init(void)

{

    /*---------------------------------------------------------------------------------------------------------*/

    /* Init System Clock                                                                                       */

    /*---------------------------------------------------------------------------------------------------------*/

    SYS_UnlockReg();



  /* Enable HIRC clock (Internal RC 22.1184MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);



    /* Wait for HIRC clock ready */

    CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);



    /* Select HCLK clock source as HIRC and HCLK clock divider as 1 */

    CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));



    /* Set core clock as PLL_CLOCK from PLL */

    CLK_SetCoreClock(PLL_CLOCK);

    /* Set SysTick clock source to HCLK source divide 2 */

    CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLKSEL_HCLK_DIV2);



    SYS_LockReg();

}

/*自己添加跟串口有关的时钟初始化*/

static void rt_hw_usart_init()

{

    /* Unlock protected registers */

    SYS_UnlockReg();



    /* Enable HXT clock (external XTAL 12MHz) */

    CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);



    /* Wait for HXT clock ready */

    CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);

  

    /* Enable UART module clock */

    CLK_EnableModuleClock(UART0_MODULE);



    /* Select UART module clock source as HXT and UART module clock divider as 1 */

    CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));



    /*---------------------------------------------------------------------------------------------------------*/

    /* Init I/O Multi-function                                                                                 */

    /*---------------------------------------------------------------------------------------------------------*/



    /* Set multi-function pins for UART0 RXD and TXD */

    SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA2MFP_Msk | SYS_GPA_MFPL_PA3MFP_Msk);

    SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA3MFP_UART0_RXD | SYS_GPA_MFPL_PA2MFP_UART0_TXD);



    /* Lock protected registers */

    SYS_LockReg();

                

                    /* Reset UART0 */

    SYS_ResetModule(UART0_RST);



    /* Configure UART0 and set UART0 baud rate */

    UART_Open(UART0, 115200);

}



/**

 * This function will initial your board.

 */

void rt_hw_board_init()

{

    /* Configure the system clock */

    rt_hw_system_init();



                /* System Clock Update */

    SystemCoreClockUpdate();

    

    /* System Tick Configuration */

    _SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);



        /* Initial usart deriver, and set console device */

                rt_hw_usart_init();        

        

    /* Call components board initial (use INIT_BOARD_EXPORT()) */

#ifdef RT_USING_COMPONENTS_INIT

    rt_components_board_init();

#endif



#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)

    rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());

#endif

}



void SysTick_Handler(void)

{

    /* enter interrupt */

    rt_interrupt_enter();



    rt_tick_increase();



    /* leave interrupt */

    rt_interrupt_leave();

}

/*自己添加对接串口控制台*/

void rt_hw_console_output(const char *str)

{

        printf("%s",str);

}



char rt_hw_console_getchar(void)

{

 return getchar();

}