代码在：https://gitee.com/kwydm/open-harmony-taurus
目录大致结构
1.驱动开发
创建目录：//vendor/huawei/hdf/LED/src
新建Makefile
include $(LITEOSTOPDIR)/../../drivers/adapter/khdf/liteos/lite.mk
MODULE_NAME := hdf_led_driver
LOCAL_SRCS += led.c
LOCAL_INCLUDE := ./include
LOCAL_CFLAGS += -fstack-protector-strong -Wextra -Wall -Werror
include $(HDF_DRIVER)打开//device/hisilicon/drivers/lite.mk 编译结果文件链接到内核镜像
## 在头部添加变量
VENDOR_HDF_DRIVERS_ROOT := $(LITEOSTOPDIR)/../../vendor/huawei/hdf
LITEOS_BASELIB += -lhdf_led_driver
LIB_SUBDIRS += $(VENDOR_HDF_DRIVERS_ROOT)/LED/src新建led.c
#include "hdf_device_desc.h" // HDF框架对驱动开放相关能力接口的头文件
#include "hdf_log.h" // HDF 框架提供的日志接口头文件
#include "device_resource_if.h"
#include "osal_io.h"
#include "osal_mem.h"
#include "gpio_if.h"
#include "osal_irq.h"
#include "osal_time.h"
#define HDF_LOG_TAG led_driver // 打印日志所包含的标签，如果不定义则用默认定义的HDF_TAG标签
#define LED_WRITE_READ 1 // 读写操作码1
static int32_t CtlLED(int mode)
{
int32_t ret;
uint16_t valRead;
/* LED的GPIO管脚号 */
uint16_t gpio = 5 * 8 + 1; // 红外补光灯
// uint16_t gpio = 2 * 8 + 3; // 绿色指示灯
// uint16_t gpio = 3 * 8 + 4; // 红色指示灯
/* 将GPIO管脚配置为输出 */
ret = GpioSetDir(gpio, GPIO_DIR_OUT);
if (ret != 0)
{
HDF_LOGE("GpioSerDir: failed, ret %d\n", ret);
return ret;
}
if (mode == -1)
{
// 翻转输出口
(void)GpioRead(gpio, &valRead);
ret = GpioWrite(gpio, (valRead == GPIO_VAL_LOW) ? GPIO_VAL_HIGH : GPIO_VAL_LOW);
}
else
{
ret = GpioWrite(gpio, mode);
}
if (ret != 0)
{
HDF_LOGE("GpioWrite: failed, ret %d\n", ret);
return ret;
}
return ret;
}
// Dispatch是用来处理用户态发下来的消息
int32_t LedDriverDispatch(struct HdfDeviceIoClient *client, int cmdCode, struct HdfSBuf *data, struct HdfSBuf *reply)
{
int32_t result = HDF_FAILURE;
HDF_LOGE("Led driver dispatch");
if (client == NULL || client->device == NULL)
{
HDF_LOGE("Led driver device is NULL");
return HDF_ERR_INVALID_OBJECT;
}
switch (cmdCode){
case LED_WRITE_READ:
const char *recv = HdfSbufReadString(data);
if (recv != NULL)
{
//HDF_LOGI("recv: %s", recv);
result = CtlLED(-1);
// CtlLED(GPIO_VAL_HIGH);
if (!HdfSbufWriteInt32(reply, result)){
//HDF_LOGE("replay is fail");
}
return HdfDeviceSendEvent(client->device, cmdCode, data);
}
break;
default:
break;
}
return result;
}
//驱动对外提供的服务能力，将相关的服务接口绑定到HDF框架
int32_t HdfLedDriverBind(struct HdfDeviceObject *deviceObject)
{
if (deviceObject == NULL)
{
HDF_LOGE("Led driver bind failed!");
return HDF_ERR_INVALID_OBJECT;
}
static struct IDeviceIoService ledDriver = {
.Dispatch = LedDriverDispatch,
};
deviceObject->service = (struct IDeviceIoService *)(&ledDriver);
HDF_LOGD("Led driver bind success");
return HDF_SUCCESS;
}
// 驱动自身业务初始的接口
int32_t HdfLedDriverInit(struct HdfDeviceObject *deviceObject)
{
if (deviceObject == NULL)
{
HDF_LOGE("Led driver Init failed!");
return HDF_ERR_INVALID_OBJECT;
}
HDF_LOGD("Led driver Init success");
return HDF_SUCCESS;
}
// 驱动资源释放的接口
void HdfLedDriverRelease(struct HdfDeviceObject *deviceObject)
{
if (deviceObject == NULL)
{
HDF_LOGE("Led driver release failed!");
return;
}
HDF_LOGD("Led driver release success");
return;
}
// 定义驱动入口的对象，必须为HdfDriverEntry（在hdf_device_desc.h中定义）类型的全局变量
struct HdfDriverEntry g_ledDriverEntry = {
.moduleVersion = 1,
.moduleName = "led_driver",
.Bind = HdfLedDriverBind,
.Init = HdfLedDriverInit,
.Release = HdfLedDriverRelease,
};
// 调用HDF_INIT将驱动入口注册到HDF框架中，在加载驱动时HDF框架会先调用Bind函数,再调用Init函数加载该驱动，当Init调用异常时，HDF框架会调用Release释放驱动资源并退出。
HDF_INIT(g_ledDriverEntry);2.用户态
\vendor\huawei\hdf\LED\dispatch\CallLED.c
#include <stdio.h> #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 LED_WRITE_READ 1 #define HDF_LOG_TAG LED_APP #define LED_SERVICE "led_service" // 接收驱动上报事件 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"); return HDF_FAILURE; } HDF_LOGE("%s: dev event received: %u %s", (char *)priv, id, string); 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, LED_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(void) { struct HdfIoService *serv = HdfIoServiceBind(LED_SERVICE);// 用户态获取驱动的服务 if (serv == NULL) { HDF_LOGE("fail to get service %s", LED_SERVICE); return HDF_FAILURE; } static struct HdfDevEventlistener listener = { .callBack = OnDevEventReceived, .priv = "Service0"}; // 用户态程序注册接收驱动上报事件的操作方法。 if (HdfDeviceRegisterEventListener(serv, &listener) != HDF_SUCCESS) { HDF_LOGE("fail to register event listener"); return HDF_FAILURE; } char *send_cmd = "toggle LED"; while (1) { if (SendEvent(serv, send_cmd)) { HDF_LOGE("fail to send event"); return HDF_FAILURE; } sleep(1); } if (HdfDeviceUnregisterEventListener(serv, &listener)) { HDF_LOGE("fail to unregister listener"); return HDF_FAILURE; } HdfIoServiceRecycle(serv);// 释放驱动服务。 HDF_LOGI("exit"); return HDF_SUCCESS; }\vendor\huawei\hdf\LED\dispatch\BUILD.gn
# Copyright (c) 2020 Huawei Device Co., Ltd.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
HDF_FRAMEWORKS = "//drivers/framework"
# 暂时放在这里编译用户态设备驱动消息调用程序，回头在考虑移到独立组件去编译Gavin Lee
executable("CallLED") {
sources = [
"//vendor/huawei/hdf/LED/dispatch/CallLED.c"
]
include_dirs = [
"//vendor/huawei/hdf/LED/include",
"$HDF_FRAMEWORKS/core/adapter/vnode/include",
"$HDF_FRAMEWORKS/core/adapter/syscall/include",
"$HDF_FRAMEWORKS/core/shared/include",
"$HDF_FRAMEWORKS/core/host/include",
"$HDF_FRAMEWORKS/core/manager/include",
"$HDF_FRAMEWORKS/ability/sbuf/include",
"$HDF_FRAMEWORKS/include/core",
"$HDF_FRAMEWORKS/include/utils",
"$HDF_FRAMEWORKS/utils/include",
"$HDF_FRAMEWORKS/include/osal",
"$HDF_FRAMEWORKS/../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/posix:hdf_posix",
"//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",
"-Werror",
]
}vendor\huawei\hdf\LED\BUILD.gn
import("//build/lite/config/component/lite_component.gni")
lite_component("led_gpio"){
features = ["dispatch:CallLED"]
}build\lite\components\drivers.json
3.烧录运行
串口发送下面的代码
./bin/CallLED
执行之后这个补光灯会1S闪一次
参考：https://harmonyos.51cto.com/posts/2820，Gavin，Dweb九弓子
作者：卡哇伊大喵
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