RT-Thread STM32L431 Bear-Pi开发板BSP说明

RT-Thread STM32L431 Bear-Pi开发板BSP说明

简介

本文档为Bear-Pi 开发板的 BSP (板级支持包) 说明。

主要内容如下：

• 开发板资源介绍
• BSP 快速上手
• 进阶使用方法

通过阅读快速上手章节开发者可以快速地上手该 BSP，将 RT-Thread 运行在开发板上。在进阶使用指南章节，将会介绍更多高级功能，帮助开发者利用 RT-Thread 驱动更多板载资源。

开发板介绍

对于 Bear-Pi，内核是 Cortex-M4，这款芯片是低功耗系列，板载 ST-LINK/V2-1 调试器/编程器，迷你尺寸，mirco USB 接口，可数的外设，Arduino™ nano 兼容的接口。

开发板外观如下图所示：

该开发板常用 板载资源 如下：

• MCU：STM32L431RC，主频 80MHz，256KB FLASH ，64KB RAM。
• 常用外设
  • SPI FLASH: 8M
  • 按键：2个功能键，一个复位按键。
  • 支持E53系列传感器案例扩展板
  • LCD: 240 * 240 tft
  • LED：一个用户LED， 上电指示灯，下载灯。
• 常用接口：USB 支持 3 种不同接口：虚拟 COM 端口、大容量存储和调试端口。
• 调试接口：板载 ST-LINK/V2-1 调试器。

开发板更多详细信息请参考【Bear-Pi 官网】 Bear-Pi。

外设支持

本 BSP 目前对外设的支持情况如下：

使用说明

使用说明分为如下两个章节：

• 快速上手

  本章节是为刚接触 RT-Thread 的新手准备的使用说明，遵循简单的步骤即可将 RT-Thread 操作系统运行在该开发板上，看到实验效果 。

• 进阶使用

  本章节是为需要在 RT-Thread 操作系统上使用更多开发板资源的开发者准备的。通过使用 ENV 工具对 BSP 进行配置，可以开启更多板载资源，实现更多高级功能。

快速上手

本 BSP 为开发者提供 MDK5 和 IAR 工程，并且支持 GCC 开发环境。下面以 MDK5 开发环境为例，介绍如何将系统运行起来。

硬件连接

使用数据线连接开发板到 PC，打开电源开关。

编译下载

双击 project.uvprojx 文件，打开 MDK5 工程，编译并下载程序到开发板。

工程默认配置使用 ST-LINK 仿真器下载程序，在通过 microUSB 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

运行结果

下载程序成功之后，系统会自动运行，观察开发板上 LED 的运行效果，红色 D5、蓝色 LED 会周期性闪烁。

USB 虚拟 COM 端口默认连接串口 1，在终端工具里打开相应的串口（115200-8-1-N），复位设备后，可以看到 RT-Thread 的输出信息:

 \ | /
- RT -     Thread Operating System
 / | \     4.0.3 build Dec 28 2020
 2006 - 2020 Copyright by rt-thread team
---Welcome use BearPi---
msh >

进阶使用

此 BSP 默认只开启了 GPIO 和 串口2 的功能，如果需使用更多高级功能，需要利用 ENV 工具对 BSP 进行配置，步骤如下：

1. 在 bsp 下打开 env 工具。

2. 输入menuconfig命令配置工程，配置好之后保存退出。

3. 输入pkgs --update命令更新软件包。

4. 输入scons --target=mdk4/mdk5/iar 命令重新生成工程。

本章节更多详细的介绍请参考 STM32 系列 BSP 外设驱动使用教程。

注意事项

• 开机时如果不能打印 RT-Thread 版本信息，请将BSP中串口 GPIO 速率调低
• 开机时如果不能打印 RT-Thread 版本信息，请重新选择 PC 端串口调试软件的串口号

示例代码

…\rt-threadcode\src\ipc.c

/**
 * @brief    This function will try to take a mutex, if the mutex is unavailable, the thread returns immediately.
 *
 * @note     This function is very similar to the rt_mutex_take() function, when the mutex is not available,
 *           except that rt_mutex_trytake() will return immediately without waiting for a timeout
 *           when the mutex is not available.
 *           In other words, rt_mutex_trytake(mutex) has the same effect as rt_mutex_take(mutex, 0).
 *
 * @see      rt_mutex_take()
 *
 * @param    mutex is a pointer to a mutex object.
 *
 * @return   Return the operation status. ONLY When the return value is RT_EOK, the operation is successful.
 *           If the return value is any other values, it means that the mutex take failed.
 */
rt_err_t rt_mutex_trytake(rt_mutex_t mutex)
{
    return rt_mutex_take(mutex, RT_WAITING_NO);
}
RTM_EXPORT(rt_mutex_trytake);


/**
 * @brief    This function will release a mutex. If there is thread suspended on the mutex, the thread will be resumed.
 *
 * @note     If there are threads suspended on this mutex, the first thread in the list of this mutex object
 *           will be resumed, and a thread scheduling (rt_schedule) will be executed.
 *           If no threads are suspended on this mutex, the count value mutex->value of this mutex will increase by 1.
 *
 * @param    mutex is a pointer to a mutex object.
 *
 * @return   Return the operation status. When the return value is RT_EOK, the operation is successful.
 *           If the return value is any other values, it means that the mutex release failed.
 */
rt_err_t rt_mutex_release(rt_mutex_t mutex)
{
    rt_base_t level;
    struct rt_thread *thread;
    rt_bool_t need_schedule;

    /* parameter check */
    RT_ASSERT(mutex != RT_NULL);
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);

    need_schedule = RT_FALSE;

    /* only thread could release mutex because we need test the ownership */
    RT_DEBUG_IN_THREAD_CONTEXT;

    /* get current thread */
    thread = rt_thread_self();

    level = rt_spin_lock_irqsave(&(mutex->spinlock));

    LOG_D("mutex_release:current thread %s, hold: %d",
          thread->parent.name, mutex->hold);

    RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(mutex->parent.parent)));

    /* mutex only can be released by owner */
    if (thread != mutex->owner)
    {
        thread->error = -RT_ERROR;
        rt_spin_unlock_irqrestore(&(mutex->spinlock), level);

        return -RT_ERROR;
    }

    /* decrease hold */
    mutex->hold --;
    /* if no hold */
    if (mutex->hold == 0)
    {
        /* remove mutex from thread's taken list */
        rt_list_remove(&mutex->taken_list);

        /* whether change the thread priority */
        if ((mutex->ceiling_priority != 0xFF) || (thread->current_priority == mutex->priority))
        {
            rt_uint8_t priority = 0xff;

            /* get the highest priority in the taken list of thread */
            priority = _thread_get_mutex_priority(thread);

            rt_thread_control(thread,
                              RT_THREAD_CTRL_CHANGE_PRIORITY,
                              &priority);

            need_schedule = RT_TRUE;
        }

        /* wakeup suspended thread */
        if (!rt_list_isempty(&mutex->parent.suspend_thread))
        {
            /* get the first suspended thread */
            struct rt_thread *next_thread = rt_list_entry(mutex->parent.suspend_thread.next,
                                   struct rt_thread,
                                   tlist);

            LOG_D("mutex_release: resume thread: %s",
                  next_thread->parent.name);

            rt_spin_lock(&(next_thread->spinlock));
            /* remove the thread from the suspended list of mutex */
            rt_list_remove(&(next_thread->tlist));

            /* set new owner and put mutex into taken list of thread */
            mutex->owner = next_thread;
            mutex->hold  = 1;
            rt_list_insert_after(&next_thread->taken_object_list, &mutex->taken_list);
            /* cleanup pending object */
            next_thread->pending_object = RT_NULL;
            rt_spin_unlock(&(next_thread->spinlock));
            /* resume thread */
            rt_thread_resume(next_thread);

            /* update mutex priority */
            if (!rt_list_isempty(&(mutex->parent.suspend_thread)))
            {
                struct rt_thread *th;

                th = rt_list_entry(mutex->parent.suspend_thread.next,
                        struct rt_thread,
                        tlist);
                mutex->priority = th->current_priority;
            }
            else
            {
                mutex->priority = 0xff;
            }

            need_schedule = RT_TRUE;
        }
        else
        {
            /* clear owner */
            mutex->owner    = RT_NULL;
            mutex->priority = 0xff;
        }
    }

    rt_spin_unlock_irqrestore(&(mutex->spinlock), level);

    /* perform a schedule */
    if (need_schedule == RT_TRUE)
        rt_schedule();

    return RT_EOK;
}
RTM_EXPORT(rt_mutex_release);


/**
 * @brief    This function will set some extra attributions of a mutex object.
 *
 * @note     Currently this function does not implement the control function.
 *
 * @param    mutex is a pointer to a mutex object.
 *
 * @param    cmd is a command word used to configure some attributions of the mutex.
 *
 * @param    arg is the argument of the function to execute the command.
 *
 * @return   Return the operation status. When the return value is RT_EOK, the operation is successful.
 *           If the return value is any other values, it means that this function failed to execute.
 */
rt_err_t rt_mutex_control(rt_mutex_t mutex, int cmd, void *arg)
{
    /* parameter check */
    RT_ASSERT(mutex != RT_NULL);
    RT_ASSERT(rt_object_get_type(&mutex->parent.parent) == RT_Object_Class_Mutex);

    return -RT_ERROR;
}
RTM_EXPORT(rt_mutex_control);

/**@}*/
#endif /* RT_USING_MUTEX */

源码下载

…\bsp\stm32\stm32l431-BearPi\project.uvproj

RT-Thread STM32L431 Bear-Pi开发板BSP说明 源码下载文章来源地址https://www.toymoban.com/news/detail-763863.html

维护人:

• 华为奋斗者精神, 邮箱：1992152446@qq.com

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