您现在的位置是：亿华云 > 应用开发

HDF驱动框架探路(二)：openharmony最新源码，打通应用态到内核态

亿华云2025-10-03 02:56:54【应用开发】3人已围观

简介想了解更多内容，请访问：和华为官方合作共建的鸿蒙技术社区https://harmonyos.51cto.com老规矩还是将最终希望跑出来的效果放出来。如下：HDF驱动框架探路2:前言1.首先本文章的源

想了解更多内容，动框打通请访问：

和华为官方合作共建的架探鸿蒙技术社区

https://harmonyos.51cto.com

老规矩还是将最终希望跑出来的效果放出来。如下：

HDF驱动框架探路2:

前言

1.首先本文章的最新源码是2021.11.25拉的openharmony的master分支。之前也有一些大神基于3516应用态打通到了内核态，源码应用不过都很久远了，态到态尤其是内核3.0LTS发布之后，整个框架都改动过了，动框打通按照大神们的架探操作我这边基于最新的高防服务器源码都没有测试成功。有大佬可以留言指导一拨儿。最新

2.本文章是源码应用基于Hi3516轻量系统来打造的。

应用态打通内核态的态到态总体框架图

从上图可以很直观的看出驱动开发的过程中基于linux开发和基于openharmony开发的最大区别

1.linux驱动开发中会涉及到应用层的glic等，以及驱动层的内核内核函数调用，但是动框打通在openharmony这些以及都被HDF框架给隐藏起来了，所以我们只需要根据HDF框架来进行openharmony框架开发，服务器托管架探就可以了。最新

2.openharmony应用层其实是调用了HDF框架的驱动消息机制

1.应用程序

1.1 应用层业务代码

2.然后进入myapp目录新建helloworld_test.c，然后将下列代码拷贝入内

#include <fcntl.h> #include <sys/stat.h> #include <sys/ioctl.h> #include <unistd.h> #include "hdf_log.h" #include "hdf_sbuf.h" #include "hdf_io_service_if.h" #define HDF_LOG_TAG "sample_test" #define SAMPLE_SERVICE_NAME "GPIO_TEST" #define SAMPLE_WRITE_READ 0 int g_replyFlag = 0; static int OnDevEventReceived(void *priv, uint32_t id, struct HdfSBuf *data) { const char *string = HdfSbufReadString(data); if (string == NULL) { HDF_LOGE("fail to read string in event data"); g_replyFlag = 1; return HDF_FAILURE; } HDF_LOGE("%s: dev event received: %u %s", (char *)priv, id, string); g_replyFlag = 1; return HDF_SUCCESS; } static int SendEvent(struct HdfIoService *serv, char *eventData) { int ret = 0; struct HdfSBuf *data = HdfSBufObtainDefaultSize(); if (data == NULL) { HDF_LOGE("fail to obtain sbuf data"); return 1; } struct HdfSBuf *reply = HdfSBufObtainDefaultSize(); if (reply == NULL) { HDF_LOGE("fail to obtain sbuf reply"); ret = HDF_DEV_ERR_NO_MEMORY; goto out; } if (!HdfSbufWriteString(data, eventData)) { HDF_LOGE("fail to write sbuf"); ret = HDF_FAILURE; goto out; } ret = serv->dispatcher->Dispatch(&serv->object, SAMPLE_WRITE_READ, data, reply); if (ret != HDF_SUCCESS) { HDF_LOGE("fail to send service call"); goto out; } int replyData = 0; if (!HdfSbufReadInt32(reply, &replyData)) { HDF_LOGE("fail to get service call reply"); ret = HDF_ERR_INVALID_OBJECT; goto out; } HDF_LOGE("Get reply is: %d", replyData); out: HdfSBufRecycle(data); HdfSBufRecycle(reply); return ret; } int main() { char *sendData = "hi"; struct HdfIoService *serv = HdfIoServiceBind(SAMPLE_SERVICE_NAME); if (serv == NULL) { HDF_LOGE("fail to get service %s", SAMPLE_SERVICE_NAME); return HDF_FAILURE; } HDF_LOGE("success to get service %s", SAMPLE_SERVICE_NAME); static struct HdfDevEventlistener listener = { .callBack = OnDevEventReceived, .priv ="Service0" }; if (HdfDeviceRegisterEventListener(serv, &listener) != HDF_SUCCESS) { HDF_LOGE("fail to register event listener"); return HDF_FAILURE; } HDF_LOGE("success to register event listener"); if (SendEvent(serv, sendData)) { HDF_LOGE("fail to send event"); return HDF_FAILURE; } /* wait for event receive event finishing */ while (g_replyFlag == 0) { sleep(1); } if (HdfDeviceUnregisterEventListener(serv, &listener)) { HDF_LOGE("fail to unregister listener"); return HDF_FAILURE; } HdfIoServiceRecycle(serv); return HDF_SUCCESS; }

1.2 应用层业务代码以可执行文件编译进系统

进入源码目录找到drivers/adapter/uhdf/manager/BUILD.gn 文件，然后在文件末尾拷贝下述代码。

HDF_FRAMEWORKS = "//drivers/framework" executable("helloworld_test") { sources = ["//myapp/helloworld_test.c" ] include_dirs = [ "$HDF_FRAMEWORKS/ability/sbuf/include", "$HDF_FRAMEWORKS/core/shared/include", "$HDF_FRAMEWORKS/core/host/include", "$HDF_FRAMEWORKS/core/master/include", "$HDF_FRAMEWORKS/include/core", "$HDF_FRAMEWORKS/include/utils", "$HDF_FRAMEWORKS/utils/include", "$HDF_FRAMEWORKS/include/osal", "//drivers/adapter/uhdf/posix/include", "//third_party/bounds_checking_function/include", "//base/hiviewdfx/hilog_lite/interfaces/native/innerkits", ] deps = [ "//base/hiviewdfx/hilog_lite/frameworks/featured:hilog_shared", "//drivers/adapter/uhdf/manager:hdf_core", "//drivers/adapter/uhdf/posix:hdf_posix_osal", ] public_deps = [ "//third_party/bounds_checking_function:libsec_shared" ] defines = [ "__USER__" ] cflags = [ "-Wall", "-Wextra", "-Wno-format", "-Wno-format-extra-args", ] }