OpenHarmony设备开发 轻量系统内核（LiteOS-M）扩展组件

void app_init(void)
{
......
/* 启动阶段C++初始化 */
LOS_CppSystemInit((UINTPTR)&__init_array_start__, (UINTPTR)&__init_array_end__);
/* C++业务 */
......
}

#include "los_task.h"
#include "los_cpup.h"

#define TEST_TASK_PRIO  5
#define TASK_DELAY_TIME 100
VOID CpupTask(VOID)
{
    printf("entry cpup test example\n");
    usleep(TASK_DELAY_TIME);
    usleep(TASK_DELAY_TIME);
    printf("exit cpup test example\n");
}

UINT32 ExampleCpup(VOID)
{
    UINT32 ret;
    UINT32 cpupUse;
    UINT32 taskID;
    TSK_INIT_PARAM_S cpupTestTask = { 0 };

    cpupTestTask.pfnTaskEntry = (TSK_ENTRY_FUNC)CpupTask;
    cpupTestTask.pcName       = "TestCpupTsk";
    cpupTestTask.uwStackSize  = LOSCFG_BASE_CORE_TSK_DEFAULT_STACK_SIZE;
    cpupTestTask.usTaskPrio   = TEST_TASK_PRIO;
    ret = LOS_TaskCreate(&taskID, &cpupTestTask);
    if(ret != LOS_OK) {
        printf("cpupTestTask create failed .\n");
        return LOS_NOK;
    }

    usleep(TASK_DELAY_TIME);

    /* 获取当前系统CPU占用率 */
    cpupUse = LOS_SysCpuUsage();
    printf("the current system cpu usage is: %u.%u\n",
            cpupUse / LOS_CPUP_PRECISION_MULT, cpupUse % LOS_CPUP_PRECISION_MULT);

    /* 获取当前系统历史CPU占用率 */
    cpupUse = LOS_HistorySysCpuUsage(CPUP_LESS_THAN_1S);
    printf("the history system cpu usage in all time：%u.%u\n",
           cpupUse / LOS_CPUP_PRECISION_MULT, cpupUse % LOS_CPUP_PRECISION_MULT);

    /* 获取指定任务的CPU占用率 */
    cpupUse = LOS_TaskCpuUsage(taskID);
    printf("cpu usage of the cpupTestTask:\n TaskID: %d\n usage: %u.%u\n",
           taskID, cpupUse / LOS_CPUP_PRECISION_MULT, cpupUse % LOS_CPUP_PRECISION_MULT);

    /* 获取指定任务在系统启动到现在的CPU占用率 */
    cpupUse = LOS_HistoryTaskCpuUsage(taskID, CPUP_LESS_THAN_1S);
    printf("cpu usage of the cpupTestTask in all time:\n TaskID: %d\n usage: %u.%u\n",
           taskID, cpupUse / LOS_CPUP_PRECISION_MULT, cpupUse % LOS_CPUP_PRECISION_MULT);

    return LOS_OK;
}

entry cpup test example
the current system cpu usage is: 8.2
the history system cpu usage in all time：8.9
cpu usage of the cpupTestTask:
 TaskID: 5
 usage: 0.5
cpu usage of the cpupTestTask in all time:
 TaskID: 5
 usage: 0.5

exit cpup test example

根据实际运行环境，上文中的数据会有差异，非固定结果

typedef struct {
  CHAR    *name;
  UINTPTR addr;
} SymInfo;

#define SYM_EXPORT(func)                                            \
const SymInfo sym_##func __attribute__((section(".sym."#func))) = { \
    .name = #func,                                                  \
    .addr = (UINTPTR)func                                           \
};

$ readelf -l lib.so

Elf file type is DYN (Shared object file)
Entry point 0x5b4
There are 4 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  EXIDX          0x000760 0x00000760 0x00000760 0x00008 0x00008 R   0x4
  LOAD           0x000000 0x00000000 0x00000000 0x0076c 0x0076c R E 0x10000LOAD           0x00076c 0x0001076c 0x0001076c 0x0010c 0x00128 RW  0x10000
  DYNAMIC        0x000774 0x00010774 0x00010774 0x000c8 0x000c8 RW  0x4

 Section to Segment mapping:
  Segment Sections...
   00     .ARM.exidx
   01     .hash .dynsym .dynstr .rel.dyn .rel.plt .init .plt .text .fini .ARM.exidx .eh_frame
   02     .init_array .fini_array .dynamic .got .data .bss
   03     .dynamic

#define FF_VOLUME_STRS     "system", "inner", "update", "user"
#define FS_MAX_SS          512
#define FAT_MAX_OPEN_FILES 50

#include "fatfs_conf.h"
#include "fs_config.h"
#include "los_config.h"
#include "ram_virt_flash.h"
#include "los_fs.h"

struct fs_cfg {
    CHAR *mount_point;
    struct PartitionCfg partCfg;
};

INT32 FatfsLowLevelInit()
{
    INT32 ret;
    INT32 i;
    UINT32 addr;
    int data = FMT_FAT32;

    const char * const pathName[FF_VOLUMES] = {FF_VOLUME_STRS};
    HalLogicPartition *halPartitionsInfo = getPartitionInfo(); /* 获取长度和起始地址的函数，请根据实际单板适配 */
    INT32 lengthArray[FF_VOLUMES] = {25, 25, 25, 25};
    INT32 addrArray[FF_VOLUMES];

    /* 配置各分区的地址和长度，请根据实际单板适配 */
    for (i = 0; i < FF_VOLUMES; i++) {
        addr = halPartitionsInfo[FLASH_PARTITION_DATA1].partitionStartAddr + i * 0x10000;
        addrArray[i] = addr;
        FlashInfoInit(i, addr);
    }

    /* 配置分区信息，请根据实际单板适配 */
    SetupDefaultVolToPartTable();

    ret = LOS_DiskPartition("spinorblk0", "vfat", lengthArray, addrArray, FF_VOLUMES);
    printf("%s: DiskPartition %s\n", __func__, (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }

    ret = LOS_PartitionFormat("spinorblk0p0", "vfat", &data);
    printf("%s: PartitionFormat %s\n", __func__, (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }

    ret = mount("spinorblk0p0", "/system", "vfat", 0, &data);
    printf("%s: mount fs on '%s' %s\n", __func__, pathName[0], (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }
    return 0;
}

#include <stdio.h>
#include <string.h>
#include "sys/stat.h"
#include "fcntl.h"
#include "unistd.h"

#define BUF_SIZE 20
#define TEST_ROOT "system"  /* 测试的根目录请根据实际情况调整 */
VOID ExampleFatfs(VOID)
{
  int ret;
  int fd;
  ssize_t len;
  off_t off;
  char dirName[BUF_SIZE] = TEST_ROOT"/test";
  char fileName[BUF_SIZE] = TEST_ROOT"/test/file.txt";
  char writeBuf[BUF_SIZE] = "Hello OpenHarmony!";
  char readBuf[BUF_SIZE] = {0};

  /* 创建测试目录 */
  ret = mkdir(dirName, 0777);
  if (ret != LOS_OK) {
      printf("mkdir failed.\n");
      return;
  }

  /* 创建可读写测试文件 */
  fd = open(fileName, O_RDWR | O_CREAT, 0777);
  if (fd < 0) {
      printf("open file failed.\n");
      return;
  }

  /* 将writeBuf中的内容写入文件 */
  len = write(fd, writeBuf, strlen(writeBuf));
  if (len != strlen(writeBuf)) {
      printf("write file failed.\n");
      return;
  }

  /* 将文件内容刷入存储设备中 */
  ret = fsync(fd);
  if (ret != LOS_OK) {
      printf("fsync failed.\n");
      return;
  }

  /* 将读写指针偏移至文件头 */
  off = lseek(fd, 0, SEEK_SET);
  if (off != 0) {
      printf("lseek failed.\n");
      return;
  }

  /* 将文件内容读出至readBuf中，读取长度为readBuf大小 */
  len = read(fd, readBuf, sizeof(readBuf));
  if (len != strlen(writeBuf)) {
      printf("read file failed.\n");
      return;
  }
  printf("%s\n", readBuf);

  /* 关闭测试文件 */
  ret = close(fd);
  if (ret != LOS_OK) {
      printf("close failed.\n");
      return;
  }

  /* 删除测试文件 */
  ret = unlink(fileName);
  if (ret != LOS_OK) {
      printf("unlink failed.\n");
      return;
  }

  /* 删除测试目录 */
  ret = rmdir(dirName);
  if (ret != LOS_OK) {
      printf("rmdir failed.\n");
      return;
  }

  return;
}

Hello OpenHarmony!

#include "los_config.h"
#include "ram_virt_flash.h"
#include "los_fs.h"

struct fs_cfg {
    CHAR *mount_point;
    struct PartitionCfg partCfg;
};

INT32 LfsLowLevelInit()
{
    INT32 ret;
    struct fs_cfg fs[LOSCFG_LFS_MAX_MOUNT_SIZE] = {0};
    HalLogicPartition *halPartitionsInfo = getPartitionInfo();  /* 获取长度和起始地址的函数，请根据实际单板适配 */

    INT32 lengthArray[2];
    lengthArray[0]= halPartitionsInfo[FLASH_PARTITION_DATA0].partitionLength;

    INT32 addrArray[2];
    addrArray[0] = halPartitionsInfo[FLASH_PARTITION_DATA0].partitionStartAddr;

    ret = LOS_DiskPartition("flash0", "littlefs", lengthArray, addrArray, 2);
    printf("%s: DiskPartition %s\n", __func__, (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }
    fs[0].mount_point = "/littlefs";
    fs[0].partCfg.partNo = 0;
    fs[0].partCfg.blockSize = 4096; /* 4096, lfs block size */
    fs[0].partCfg.blockCount = 1024; /* 2048, lfs block count */
    fs[0].partCfg.readFunc = virt_flash_read;		/* flash读函数，请根据实际单板适配 */
    fs[0].partCfg.writeFunc = virt_flash_write;		/* flash写函数，请根据实际单板适配 */
    fs[0].partCfg.eraseFunc = virt_flash_erase;		/* flash擦函数，请根据实际单板适配 */

    fs[0].partCfg.readSize = 256; /* 256, lfs read size */
    fs[0].partCfg.writeSize = 256; /* 256, lfs prog size */
    fs[0].partCfg.cacheSize = 256; /* 256, lfs cache size */
    fs[0].partCfg.lookaheadSize = 16; /* 16, lfs lookahead size */
    fs[0].partCfg.blockCycles = 1000; /* 1000, lfs block cycles */

    ret = LOS_PartitionFormat("flash0", "littlefs", &fs[0].partCfg);
    printf("%s: PartitionFormat %s\n", __func__, (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }
    ret = mount(NULL, fs[0].mount_point, "littlefs", 0, &fs[0].partCfg);
    printf("%s: mount fs on '%s' %s\n", __func__, fs[0].mount_point, (ret == 0) ? "succeed" : "failed");
    if (ret != 0) {
        return -1;
    }
    return 0;
}

#include <stdio.h>
#include <string.h>
#include "sys/stat.h"
#include "fcntl.h"
#include "unistd.h"

#define BUF_SIZE 20
#define TEST_ROOT "/littlefs"  /* 测试的根目录请根据实际情况调整 */
VOID ExampleLittlefs(VOID)
{
    int ret;
    int fd;
    ssize_t len;
    off_t off;
    char dirName[BUF_SIZE] = TEST_ROOT"/test";
    char fileName[BUF_SIZE] = TEST_ROOT"/test/file.txt";
    char writeBuf[BUF_SIZE] = "Hello OpenHarmony!";
    char readBuf[BUF_SIZE] = {0};

    /* 创建测试目录 */
    ret = mkdir(dirName, 0777);
    if (ret != LOS_OK) {
        printf("mkdir failed.\n");
        return;
    }

    /* 创建可读写测试文件 */
    fd = open(fileName, O_RDWR | O_CREAT, 0777);
    if (fd < 0) {
        printf("open file failed.\n");
        return;
    }

    /* 将writeBuf中的内容写入文件 */
    len = write(fd, writeBuf, strlen(writeBuf));
    if (len != strlen(writeBuf)) {
        printf("write file failed.\n");
        return;
    }

    /* 将文件内容刷入存储设备中 */
    ret = fsync(fd);
    if (ret != LOS_OK) {
        printf("fsync failed.\n");
        return;
    }

    /* 将读写指针偏移至文件头 */
    off = lseek(fd, 0, SEEK_SET);
    if (off != 0) {
        printf("lseek failed.\n");
        return;
    }

    /* 将文件内容读出至readBuf中，读取长度为readBuf大小 */
    len = read(fd, readBuf, sizeof(readBuf));
    if (len != strlen(writeBuf)) {
        printf("read file failed.\n");
        return;
    }
    printf("%s\n", readBuf);

    /* 关闭测试文件 */
    ret = close(fd);
    if (ret != LOS_OK) {
        printf("close failed.\n");
        return;
    }

    /* 删除测试文件 */
    ret = unlink(fileName);
    if (ret != LOS_OK) {
        printf("unlink failed.\n");
        return;
    }

    /* 删除测试目录 */
    ret = rmdir(dirName);
    if (ret != LOS_OK) {
        printf("rmdir failed.\n");
        return;
    }

    return LOS_OK;
}

Hello OpenHarmony!