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menuconfig工作机制 menuconfig使用 Kconfig编写

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SCons简介 SCons基本命令 SCons常用语法 scons脚本编写

生成Keil工程

API参考文档

技术架构及目录结构内核

基础数据类型标准宏定义链表断言硬件操作抽象接口对外公共库任务管理及调度时钟节拍管理定时器管理中断管理任务间同步

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驱动

设备模型 ADC设备 DAC设备 Pulse Encoder设备 PWM设备 Serial设备 LPM设备 I2C设备 SPI设备 USB设备 Sensor设备 RTC设备 Watchdog设备 Clocksource设备 Clockevent设备 Crypto设备 CAN设备 Touch设备 Audio设备 WLAN设备

组件

SHELL工具日志系统测试框架文件系统 RAMDISK 模组连接套件套接字组件 Paho MQTT接入协议 LibCoAP接入协议 OneNET EDP接入协议 OneNET-MQTT物联网套件 OneNET-NBIoT物联网套件定位

高级语言

MicroPython

简介环境创建快速上手

windows环境 linux环境支持OneOS的开发板

库介绍

micropython标准库 micropython特定库

machine：片上资源硬件控制模块

Pin I2C SPI UART RTC PWM ADC WDT TIMER

device：外设资源硬件控制模块

OLED FontLibrary Battery Bluetooth Finger Flash Motor Humiture Key RFID SE TouchKey Voice

应用开发指南

REPL(交互式解释器) 应用脚本的开发

用户编程手册

内核驱动组件

应用笔记 FAQ

Clocksource设备

API 列表

函数	说明
os_clocksource_gettime()	获取当前时间戳
os_clocksource_ndelay()	CPU忙延时

os_clocksource_gettime

该函数用于获取当前时间戳，函数原型如下：

os_uint64_t os_clocksource_gettime(void);

参数	说明
无	无
返回	说明
当前时间戳	时间戳单位是：纳秒

os_clocksource_ndelay

该函数用于延时，函数原型如下：

void os_clocksource_ndelay(os_uint64_t nsec);

参数	说明
nsec	延时时间，单位：纳秒
返回	说明
无	无

使用示例

clocksource设备使用示例

硬件Clocksource设备的具体使用方式和步骤如下所示：

内核时钟配置为1000Hz，即：OS_TICK_PER_SECOND=1000。
读取时间戳，并记录。
调用 msleep 函数，睡眠一段时间。
读取时间戳，并记录；比对两次时间戳差值是否为 msleep 睡眠时间。
调用 os_clocksource_ndelay 延时一段时间。
读取时间戳，并记录；比对两次时间戳差值是否为 ndelay 延时时间。

#include <board.h>
#include <os_clock.h>
#include <oneos_config.h>
#include <timer/clocksource.h>
#include <shell.h>

void clocksource_test(int argc, char *argv[])
{
    os_uint32_t i;
    os_uint64_t start, now, delay;
    os_tick_t tick_start, tick_now;

    os_task_t *self = os_task_self();
    os_uint8_t task_prio = self->current_priority;
    os_uint8_t high_prio = 1;
    os_task_control(self, OS_TASK_CTRL_CHANGE_PRIORITY, &high_prio);

    for (i = 0; i < 14; i++)
    {
        delay = 1ULL << i;

        /* sync tick */
        os_task_msleep(1);

        tick_start = os_tick_get();
        start = os_clocksource_gettime();
        os_task_msleep(delay);
        tick_now = os_tick_get();
        now = os_clocksource_gettime();

        os_kprintf("msleep start tick: %d\r\n", tick_start);
        os_kprintf("msleep now   tick: %d             delta tick: %d\r\n",
                   tick_now, tick_now - tick_start);
        os_kprintf("msleep start time: %d.%09d\r\n", (int)(start / NSEC_PER_SEC), (int)(start % NSEC_PER_SEC));
        os_kprintf("msleep now   time: %d.%09d    %Ld, delta time: %d us\r\n\r\n",
                   (int)(now / NSEC_PER_SEC), (int)(now % NSEC_PER_SEC), delay, (int)((now - start) / 1000));
    }

    for (i = 0; i < 14; i++)
    {
        delay = (1ULL << i) * 1000 * 1000;
        tick_start = os_tick_get();
        start = os_clocksource_gettime();
        os_clocksource_ndelay(delay);
        tick_now = os_tick_get();
        now = os_clocksource_gettime();

        os_kprintf("udelay start tick: %d\r\n", tick_start);
        os_kprintf("udelay now   tick: %d             delta tick: %d\r\n",
                   tick_now, tick_now - tick_start);
        os_kprintf("udelay start time: %d.%09d\r\n", (int)(start / NSEC_PER_SEC), (int)(start % NSEC_PER_SEC));
        os_kprintf("udelay now   time: %d.%09d    %Ld, delta time: %d us\r\n\r\n",
                   (int)(now / NSEC_PER_SEC), (int)(now % NSEC_PER_SEC), delay, (int)((now - start) / 1000));
    }

    os_task_control(self, OS_TASK_CTRL_CHANGE_PRIORITY, &task_prio);
}

SH_CMD_EXPORT(clocksource_test, clocksource_test, "clocksource_test");

运行结果如下：

sh>clocksource_test
msleep start tick: 8980
msleep now   tick: 8981             delta tick: 1
msleep start time: 8.991786600
msleep now   time: 8.992786512    1, delta time: 999 us

msleep start tick: 9000
msleep now   tick: 9002             delta tick: 2
msleep start time: 9.011786462
msleep now   time: 9.013786525    2, delta time: 2000 us

msleep start tick: 9021
msleep now   tick: 9025             delta tick: 4
msleep start time: 9.032786500
msleep now   time: 9.036786912    4, delta time: 4000 us

msleep start tick: 9044
msleep now   tick: 9052             delta tick: 8
msleep start time: 9.055786450
msleep now   time: 9.063790525    8, delta time: 8004 us

msleep start tick: 9071
msleep now   tick: 9087             delta tick: 16
msleep start time: 9.082786462
msleep now   time: 9.098788987    16, delta time: 16002 us

msleep start tick: 9107
msleep now   tick: 9139             delta tick: 32
msleep start time: 9.118786462
msleep now   time: 9.150804762    32, delta time: 32018 us

msleep start tick: 9159
msleep now   tick: 9223             delta tick: 64
msleep start time: 9.170800937
msleep now   time: 9.234788025    64, delta time: 63987 us

msleep start tick: 9243
msleep now   tick: 9371             delta tick: 128
msleep start time: 9.254805312
msleep now   time: 9.382786625    128, delta time: 127981 us

msleep start tick: 9391
msleep now   tick: 9647             delta tick: 256
msleep start time: 9.402786450
msleep now   time: 9.658786525    256, delta time: 256000 us

msleep start tick: 9667
msleep now   tick: 10179             delta tick: 512
msleep start time: 9.678786500
msleep now   time: 10.190800000    512, delta time: 512013 us

msleep start tick: 10199
msleep now   tick: 11223             delta tick: 1024
msleep start time: 10.210800937
msleep now   time: 11.234786850    1024, delta time: 1023985 us

msleep start tick: 11244
msleep now   tick: 13292             delta tick: 2048
msleep start time: 11.255786475
msleep now   time: 13.303788987    2048, delta time: 2048002 us

msleep start tick: 13313
msleep now   tick: 17409             delta tick: 4096
msleep start time: 13.324786812
msleep now   time: 17.420800675    4096, delta time: 4096013 us

msleep start tick: 17430
msleep now   tick: 25622             delta tick: 8192
msleep start time: 17.441787912
msleep now   time: 25.633787962    8192, delta time: 8192000 us

udelay start tick: 25642
udelay now   tick: 25643             delta tick: 1
udelay start time: 25.654089850
udelay now   time: 25.655095900    1000000, delta time: 1006 us

udelay start tick: 25663
udelay now   tick: 25665             delta tick: 2
udelay start time: 25.675075937
udelay now   time: 25.677081925    2000000, delta time: 2005 us

udelay start tick: 25685
udelay now   tick: 25689             delta tick: 4
udelay start time: 25.697062200
udelay now   time: 25.701068150    4000000, delta time: 4005 us

udelay start tick: 25709
udelay now   tick: 25717             delta tick: 8
udelay start time: 25.721048187
udelay now   time: 25.729054000    8000000, delta time: 8005 us

udelay start tick: 25737
udelay now   tick: 25753             delta tick: 16
udelay start time: 25.749031962
udelay now   time: 25.765037375    16000000, delta time: 16005 us

udelay start tick: 25773
udelay now   tick: 25805             delta tick: 32
udelay start time: 25.785337737
udelay now   time: 25.817343812    32000000, delta time: 32006 us

udelay start tick: 25825
udelay now   tick: 25889             delta tick: 64
udelay start time: 25.837643925
udelay now   time: 25.901650000    64000000, delta time: 64006 us

udelay start tick: 25910
udelay now   tick: 26038             delta tick: 128
udelay start time: 25.922011487
udelay now   time: 26.050017075    128000000, delta time: 128005 us

udelay start tick: 26058
udelay now   tick: 26314             delta tick: 256
udelay start time: 26.070644750
udelay now   time: 26.326650625    256000000, delta time: 256005 us

udelay start tick: 26335
udelay now   tick: 26847             delta tick: 512
udelay start time: 26.347324212
udelay now   time: 26.859330200    512000000, delta time: 512005 us

udelay start tick: 26868
udelay now   tick: 27892             delta tick: 1024
udelay start time: 26.880010000
udelay now   time: 27.904015412    1024000000, delta time: 1024005 us

udelay start tick: 27913
udelay now   tick: 29961             delta tick: 2048
udelay start time: 27.925018562
udelay now   time: 29.973024175    2048000000, delta time: 2048005 us

udelay start tick: 29982
udelay now   tick: 34078             delta tick: 4096
udelay start time: 29.994023925
udelay now   time: 34.090029962    4096000000, delta time: 4096006 us

udelay start tick: 34099
udelay now   tick: 42291             delta tick: 8192
udelay start time: 34.111036362
udelay now   time: 42.303042012    8192000000, delta time: 8192005 us

sh>