openharmony:hilog_lite组件移植

kernel：litoes_m
MCU：stm32f407zgt6

本文仅介绍HiLog_Lite组件的移植过程，HiLog_Lite原理介绍请移步zh-cn/device-dev/subsystems/subsys-dfx-hilog-lite.md · OpenHarmony/docs - Gitee.com。

概述

HiLog_Lite是针对轻量系统类设备（参考内存≥128KiB）、小型系统类设备（参考内存≥1MiB）的hilog框架，实现了日志的打印、输出和流控功能。

1. 源码位置

hilog_lite组件的源码在路径base/hiviewdfx/hilog_lite/frameworks/mini/hiview_log.c。

//base/hiviewdfx/hilog_lite/frameworks/mini/hiview_log.c
/* The first step does not involve memory allocation. */
static void HiLogInit(void)
{
    HIVIEW_UartPrint("hilog will init.\n");
    InitCoreLogOutput();

    /* The module that is not registered cannot print the log. */
    if (HiLogRegisterModule(HILOG_MODULE_HIVIEW, "HIVIEW") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_SAMGR, "SAMGR") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_UPDATE, "UPDATE") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_ACE, "ACE") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_AAFWK, "AAFWK") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_APP, "APP") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_GRAPHIC, "GRAPHIC") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_MEDIA, "MEDIA") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_DMS, "DMS") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_SEN, "SEN") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_SCY, "SCY") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_SOFTBUS, "SOFTBUS") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_POWERMGR, "POWERMGR") == FALSE ||
        HiLogRegisterModule(HILOG_MODULE_UIKIT, "UIKIT") == FALSE) {
        return;
    }

    HiviewRegisterInitFunc(HIVIEW_CMP_TYPE_LOG, InitLogOutput);
    HiviewRegisterInitFunc(HIVIEW_CMP_TYPE_LOG_LIMIT, InitLogLimit);
    HILOG_DEBUG(HILOG_MODULE_HIVIEW, "hilog init success.");
}
CORE_INIT_PRI(HiLogInit, 0);

根据CORE_INIT_PRI可以看出，为了使用hilog_lite组件，需要先移植bootstrap组件。

2. 组件加入编译

vendor/fx/TunnelControl/config.json中增加如下内容。

        {
            "subsystem": "startup",
            "components": [
                {
                    "component": "bootstrap_lite"
                }
            ]
        },
        {
            "subsystem": "distributedschedule",
            "components": [
              {
                "component": "samgr_lite",
                "features": []
              }
            ]
        },
        {
            "subsystem": "hiviewdfx",
            "components": [
              {
                "component": "hilog_lite",
                "features": []
              }
            ]
        }

3.初始化

在main.c中调用bootstrap组件的初始化函数OHOS_SystemInit。

/**
 * @brief  The application entry point.
 * @retval int
 */
int main(void)
{
    /* MCU Configuration--------------------------------------------------------*/

    /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    HAL_Init();
    /* Configure the system clock */
    SystemClock_Config();

    /* Initialize all configured peripherals */
    MX_GPIO_Init();
    //   MX_IWDG_Init();
    HAL_Delay(3000);
    uart_printf_shell_init();
    UINT32 ret = -1;![unalign.png](https://img.haomeiwen.com/i14177609/46c4cae67955a6d9.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

    ret = LOS_KernelInit();
    OHOS_SystemInit();
#ifdef LOS_SHELL
    LosShellInit();
#endif // LOS_SHELL
    led_task_init();
    if (ret == LOS_OK)
    {
        LOS_Start();
    }
    while (1)
    {
        __asm volatile("wfi");

    }
}

4.不使能不对齐访问异常

进入liteos_m目录下，make menuconfig。不选中Enable Unaligned Exception。

unalign.png
如果选中Enable Unaligned Exception。hilog_lite组件源码中的pack(1)会导致操作指针时，引起usage fault。

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