获取源码与下载

具体操作，参考Gitee的仓库，有文档介绍如何获取源码与编译和烧录。

新增demo

1、在vendor/openvalley/niobeu4/demo下创建新文件夹，命名102_hdf_led；

2、demo文件夹下面的Kconfig applications文件增加新项目配置；

    default "102_hdf_led" if NIOBEU4_APPLICATION_102LED

3、复制102_hdf_gpio下的config文件和build.gn文件到102_hdf_led，并修改；

4、新增led_blink.c文件，编写demo；

#include <stdio.h>
#include "gpio_types.h"
#include "gpio_if.h"
#include "cmsis_os2.h"
#include "hdf_log.h"
#include "ohos_run.h"

#define SYS_DELAY_TICKS 500
#define TASK_STACK_SIZE 4096
#define TASK_PRIO 25

#define OFF 0
#define ON  1

#define LED_PIN_INDEX 9

osThreadId_t g_taskID = NULL;

static void led_blink(void) {
    osDelay(SYS_DELAY_TICKS * 2);
    GpioSetDir(LED_PIN_INDEX, GPIO_DIR_OUT);
    while (1)
    {
        GpioWrite(LED_PIN_INDEX, ON);
        osDelay(SYS_DELAY_TICKS);
        GpioWrite(LED_PIN_INDEX, OFF);
        osDelay(SYS_DELAY_TICKS * 3);
    }
}

static void led_task(void) {
    HDF_LOGE("into gpio hdf example!\n");
    osThreadAttr_t attr;
    attr.name = "blink";
    attr.attr_bits = 0U;
    attr.cb_mem = NULL;
    attr.cb_size = 0U;
    attr.stack_mem = NULL;
    attr.stack_size = TASK_STACK_SIZE;
    attr.priority = TASK_PRIO;
    g_taskID = osThreadNew((osThreadFunc_t)led_blink, NULL, &attr);
    if (g_taskID == NULL) {
        HDF_LOGE("Failed to create Test GPIO thread!\n");
    }
}

OHOS_APP_RUN(led_task);

5、在device/board/openvalley/niobeu4/liteos_m/hdf_config/hdf.hcs增加新的GPIO定义

gpio_9 :: default_config { // TXD0
  gpio_attr = ["GPIO_NUM_1", "GPIO_FLOATING", "GPIO_DRIVE_CAP_DEFAULT"];
}

编译

进入/home/ito/openharmony/niobeu4_src/kernel/liteos_m执行make menuconfig。选择(Top) → Platform → Board Selection → select board niobeu4 → use openvalley niobeu4 application → niobeu4 application choose，选择102_hdf_led，退出保存。

在项目根目录执行hb build编译