RT-Thread快速上手-Keil野火I.MX RT1052上手指南_imxrt1052

RT-Thread快速上手-Keil野火I.MX RT1052上手指南

野火 I.MX RT1052 上手指南

简介

I.MX RT1052 是野火推出的一款高性能开发板，主控芯片是 NXP 推出的基于 ARM Cortex-M7 内核的跨界处理器，最高主频为 600Mhz，该开发板具有丰富的板载资源，可以充分发挥 I.MX RT1052 的芯片性能。

开发板外观如下图所示：

board

该开发板常用 板载资源 如下：

MCU：I.MX RT1025DVL6A，主频 600MHz，512KB SRAM
外部 RAM：W9825G6KH（SDRAM，32MB）
外部 FLASH：W25Q256（SPI，32MB，存代码）、W29N01GVSIAA（NAND，128MB）、EEPROM（24c02）
常用外设： 1 个 RGB、2 个按键
常用接口：USB 转串口、DHT11 接口、LCD 接口、USB SLAVE、USB HOST
调试接口，SWD 接口
开发板更多详细信息请参考 野火官方淘宝店铺宝贝介绍。

准备工作

野火 I.MX RT1052 板级支持包提供 MDK5 和 IAR 工程，并且支持 GCC 开发环境，下面以 MDK5 开发环境为例，介绍如何将示例程序运行起来。运行示例程序前需要做如下准备工作：

1.MDK 开发环境

需要安装 MDK-ARM 5.24 (正式版或评估版，5.14 版本及以上版本均可)，这个版本也是当前比较新的版本，它能够提供相对比较完善的调试功能。安装方法可以参考 Keil MDK安装。

2.拷贝下载算法

野火的 I.MX RT1052 有自己的下载算法，点击这里获取。下载下来之后解压，将 下载算法 拷贝到 Keil_v5/ARM/Flash 目录下。

3.源码获取

https://github.com/RT-Thread/rt-thread/

源码目录说明

4.使用 USB 线连接开发板的 USB 转串口 到 PC 机。

连接到 PC

运行第一个示例程序

配置工程

进入到 rt-thread\bsp\imxrt1052-evk 文件夹中，然后按照下面的步骤配置工程

• 在bsp下打开env工具
• 输入 menuconfig 命令，RT1052 Board select (***)–>选择 T1050_FIRE 开发板。
• 输入 scons --target=mdk5 -s 生成需要的工程

编译下载

双击 project.uvprojx 文件，打开 MDK5 工程。

工程目录

执行编译，编译完成后，点击下载按钮将固件下载至开发板，下载完成后，程序会自动开始运行，观察程序运行状况。

提示：工程默认配置使用 DAP 下载程序，在通过 DAP 仿真器连接开发板的基础上，点击下载按钮即可下载程序到开发板

编译下载方法

运行

使用串口工具（如：PuTTY）打开板子对应的串口(115200-8-1-N) ，复位设备后，可以看到 RT-Thread 的输出信息:

 \ | /
- RT -     Thread Operating System
 / | \     3.1.1 build Nov 19 2018
 2006 - 2018 Copyright by rt-thread team
msh >
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继续学习

已完成 RT-Thread 快速上手！点击这里进行 内核学习 。

src/idle.c源代码

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-03-23     Bernard      the first version
 * 2010-11-10     Bernard      add cleanup callback function in thread exit.
 * 2012-12-29     Bernard      fix compiling warning.
 * 2013-12-21     Grissiom     let rt_thread_idle_excute loop until there is no
 *                             dead thread.
 * 2016-08-09     ArdaFu       add method to get the handler of the idle thread.
 * 2018-02-07     Bernard      lock scheduler to protect tid->cleanup.
 * 2018-07-14     armink       add idle hook list
 * 2018-11-22     Jesven       add per cpu idle task
 *                             combine the code of primary and secondary cpu
 */

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

#ifdef RT_USING_MODULE
#include <dlmodule.h>
#endif

#if defined (RT_USING_HOOK)
#ifndef RT_USING_IDLE_HOOK
#define RT_USING_IDLE_HOOK
#endif
#endif

#ifndef IDLE_THREAD_STACK_SIZE
#if defined (RT_USING_IDLE_HOOK) || defined(RT_USING_HEAP)
#define IDLE_THREAD_STACK_SIZE  256
#else
#define IDLE_THREAD_STACK_SIZE  128
#endif
#endif

#ifdef RT_USING_SMP
#define _CPUS_NR                RT_CPUS_NR
#else
#define _CPUS_NR                1
#endif

extern rt_list_t rt_thread_defunct;

static struct rt_thread idle[_CPUS_NR];
ALIGN(RT_ALIGN_SIZE)
static rt_uint8_t rt_thread_stack[_CPUS_NR][IDLE_THREAD_STACK_SIZE];

#ifdef RT_USING_IDLE_HOOK
#ifndef RT_IDEL_HOOK_LIST_SIZE
#define RT_IDEL_HOOK_LIST_SIZE  4
#endif

static void (*idle_hook_list[RT_IDEL_HOOK_LIST_SIZE])();

/**
 * @ingroup Hook
 * This function sets a hook function to idle thread loop. When the system performs
 * idle loop, this hook function should be invoked.
 *
 * @param hook the specified hook function
 *
 * @return RT_EOK: set OK
 *         -RT_EFULL: hook list is full
 *
 * @note the hook function must be simple and never be blocked or suspend.
 */
rt_err_t rt_thread_idle_sethook(void (*hook)(void))
{
    rt_size_t i;
    rt_base_t level;
    rt_err_t ret = -RT_EFULL;

    /* disable interrupt */
    level = rt_hw_interrupt_disable();

    for (i = 0; i < RT_IDEL_HOOK_LIST_SIZE; i++)
    {
        if (idle_hook_list[i] == RT_NULL)
        {
            idle_hook_list[i] = hook;
            ret = RT_EOK;
            break;
        }
    }
    /* enable interrupt */
    rt_hw_interrupt_enable(level);

    return ret;
}

/**
 * delete the idle hook on hook list
 *
 * @param hook the specified hook function
 *
 * @return RT_EOK: delete OK
 *         -RT_ENOSYS: hook was not found
 */
rt_err_t rt_thread_idle_delhook(void (*hook)(void))
{
    rt_size_t i;
    rt_base_t level;
    rt_err_t ret = -RT_ENOSYS;

    /* disable interrupt */
    level = rt_hw_interrupt_disable();

    for (i = 0; i < RT_IDEL_HOOK_LIST_SIZE; i++)
    {
        if (idle_hook_list[i] == hook)
        {
            idle_hook_list[i] = RT_NULL;
            ret = RT_EOK;
            break;
        }
    }
    /* enable interrupt */
    rt_hw_interrupt_enable(level);

    return ret;
}

#endif

/* Return whether there is defunctional thread to be deleted. */
rt_inline int _has_defunct_thread(void)
{
    /* The rt_list_isempty has prototype of "int rt_list_isempty(const rt_list_t *l)".
     * So the compiler has a good reason that the rt_thread_defunct list does
     * not change within rt_thread_idle_excute thus optimize the "while" loop
     * into a "if".
     *
     * So add the volatile qualifier here. */
    const volatile rt_list_t *l = (const volatile rt_list_t *)&rt_thread_defunct;

    return l->next != l;
}

/**
 * @ingroup Thread
 *
 * This function will perform system background job when system idle.
 */
void rt_thread_idle_excute(void)
{
    /* Loop until there is no dead thread. So one call to rt_thread_idle_excute
     * will do all the cleanups. */
    while (_has_defunct_thread())
    {
        rt_base_t lock;
        rt_thread_t thread;
#ifdef RT_USING_MODULE
        struct rt_dlmodule *module = RT_NULL;
#endif
        RT_DEBUG_NOT_IN_INTERRUPT;

        /* disable interrupt */
        lock = rt_hw_interrupt_disable();

        /* re-check whether list is empty */
        if (_has_defunct_thread())
        {
            /* get defunct thread */
            thread = rt_list_entry(rt_thread_defunct.next,
                                   struct rt_thread,
                                   tlist);
#ifdef RT_USING_MODULE
            module = (struct rt_dlmodule*)thread->module_id;
            if (module)
            {
                dlmodule_destroy(module);
            }
#endif
            /* remove defunct thread */
            rt_list_remove(&(thread->tlist));

            /* lock scheduler to prevent scheduling in cleanup function. */
            rt_enter_critical();

            /* invoke thread cleanup */
            if (thread->cleanup != RT_NULL)
                thread->cleanup(thread);

#ifdef RT_USING_SIGNALS
            rt_thread_free_sig(thread);
#endif

            /* if it's a system object, not delete it */
            if (rt_object_is_systemobject((rt_object_t)thread) == RT_TRUE)
            {
                /* detach this object */
                rt_object_detach((rt_object_t)thread);
                /* unlock scheduler */
                rt_exit_critical();

                /* enable interrupt */
                rt_hw_interrupt_enable(lock);

                return;
            }

            /* unlock scheduler */
            rt_exit_critical();
        }
        else
        {
            /* enable interrupt */
            rt_hw_interrupt_enable(lock);

            /* may the defunct thread list is removed by others, just return */
            return;
        }

        /* enable interrupt */
        rt_hw_interrupt_enable(lock);

#ifdef RT_USING_HEAP
        /* release thread's stack */
        RT_KERNEL_FREE(thread->stack_addr);
        /* delete thread object */
        rt_object_delete((rt_object_t)thread);
#endif
    }
}

extern void rt_system_power_manager(void);
static void rt_thread_idle_entry(void *parameter)
{
#ifdef RT_USING_SMP
    if (rt_hw_cpu_id() != 0)
    {
        while (1)
        {
            rt_hw_secondary_cpu_idle_exec();
        }
    }
#endif

    while (1)
    {
#ifdef RT_USING_IDLE_HOOK
        rt_size_t i;

        for (i = 0; i < RT_IDEL_HOOK_LIST_SIZE; i++)
        {
            if (idle_hook_list[i] != RT_NULL)
            {
                idle_hook_list[i]();
            }
        }
#endif

        rt_thread_idle_excute();
#ifdef RT_USING_PM        
        rt_system_power_manager();
#endif
    }
}

/**
 * @ingroup SystemInit
 *
 * This function will initialize idle thread, then start it.
 *
 * @note this function must be invoked when system init.
 */
void rt_thread_idle_init(void)
{
    rt_ubase_t i;
    char tidle_name[RT_NAME_MAX];

    for (i = 0; i < _CPUS_NR; i++)
    {
        rt_sprintf(tidle_name, "tidle%d", i);
        rt_thread_init(&idle[i],
                tidle_name,
                rt_thread_idle_entry,
                RT_NULL,
                &rt_thread_stack[i][0],
                sizeof(rt_thread_stack[i]),
                RT_THREAD_PRIORITY_MAX - 1,
                32);
#ifdef RT_USING_SMP
        rt_thread_control(&idle[i], RT_THREAD_CTRL_BIND_CPU, (void*)i);
#endif
        /* startup */
        rt_thread_startup(&idle[i]);
    }
}

/**
 * @ingroup Thread
 *
 * This function will get the handler of the idle thread.
 *
 */
rt_thread_t rt_thread_idle_gethandler(void)
{
#ifdef RT_USING_SMP
    register int id = rt_hw_cpu_id();
#else
    register int id = 0;
#endif

    return (rt_thread_t)(&idle[id]);
}

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