Android S HAL库的编译-阿里云开发者社区

Android S HAL库的编译

2024-05-06 60

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简介： Android S HAL库的编译

1.准备源码

Android S 源码，基于amlogic平台

2.编写hal接口

在vendor\xxx\DVB\interfaces\下创建自己的文件夹例如calculate/1.0

编写hal文件

package vendor.xxx.calculate@1.0;
 
interface ICalculate{
 
    //加法
    add(uint32_t a,uint32_t b) generates (uint32_t result);
    //减法
    sub(uint32_t a,uint32_t b) generates (uint32_t result);
    //乘法
    mul(uint32_t a,uint32_t b) generates (uint32_t result);
    //除法
    div(uint32_t a,uint32_t b) generates (uint32_t result);
    
};

3.生成Android.bp文件

执行命令：

PACKAGE=vendor.xxx.calculate@1.0

LOC=vendor/xxx/xxx/interfaces/calculate/1.0/

hidl-gen -o $LOC -Landroidbp-impl -rvendor.xxx:vendor/xxx/DVB/interfaces/ -randroid.hidl:system/libhidl/transport $PACKAGE

在calculate/1.0下生成Android.bp文件

在calculate/下创建Android.bp文件和Android.mk

// This is an autogenerated file, do not edit.
subdirs = [
    "1.0",
]

include $(call all-subdir-makefiles)

4.编译so库

使用命令 mmm 对应的文件路径就可以编译出对应的文件了

5.使用命令生成c++文件和h文件

hidl-gen -o $LOC -Lc++-impl -rvendor.xxx:vendor/xxx/DVB/interfaces/ -randroid.hidl:system/libhidl/transport $PACKAGE

然后再创建这些编译文件和rc文件即可

Android.bp

cc_binary {
    compile_multilib: "32",
    relative_install_path: "hw",
    defaults: ["hidl_defaults"],
    name: "vendor.xxx.calculate@1.0-service",    
    //vintf_fragments: ["vendor.xxx.calculate@1.0.xml"],
    init_rc: ["vendor.xxx.calculate@1.0-service.rc"],
  vendor: true,
    srcs: [
        "service.cpp"
    ],
    shared_libs: [
        "liblog",
        "libbinder",
        "libutils",
        "libhardware",
        "libhidlbase",
    "vendor.xxx.calculate@1.0",
    ],
}

Android.mk

LOCAL_PATH :=$(call my-dir)
include $(CLEAR_VARS)
 
LOCAL_MULTILIB := 32
LOCAL_MODULE_RELATIVE_PATH := hw
 
LOCAL_C_INCLUDES:= \
   vendor/xxx/DVB/sksdk/source/skportting \
   frameworks/native/libs/binder/include \
   
LOCAL_SRC_FILES:= stbmedia.cpp
 
LOCAL_SHARED_LIBRARIES:= \
   libhidlbase \
   libhidltransport \
   libcutils \
   libhardware \
   liblog \
   libutils \
   vendor.xxx.calculate@1.0 \
   libbinder \
   libsk_portting
 
LOCAL_CFLAGS +=-Wno-error=unused-parameter
LOCAL_MODULE:=vendor.xxx.calculate@1.0-impl
 
ifeq ($(SK_DVB_VENDOR_MODE),true)
LOCAL_VENDOR_MODULE := true
endif
 
include $(BUILD_SHARED_LIBRARY)

vendor.xxx.calculate@1.0-service.rc

on early-init
  chmod 666 /sys/class/gpio/export
  chmod 666 /sys/class/gpio/unexport
  
service calculate/vendor/bin/hw/vendor.xxx.calculate@1.0-service
    class hal
    user root    
  group root media system shell media_rw sdcard_rw audio camera drmrpc mediadrm everybody
    ioprio rt 4
    writepid /dev/cpuset/foreground/tasks

<manifest version="1.0" type="device" target-level="5">
    <hal format="hidl">
        <name>vendor.xxx.calculate</name>
        <transport>hwbinder</transport>
        <version>1.0</version>
        <interface>
            <name>ICalculate</name>
            <instance>default</instance>
        </interface>
    </hal>
</manifest>

service.cpp

#include <hidl/LegacySupport.h>
#include <vendor/xxx/calculate/1.0/ICalculate.h>
#include <android/log.h>
#include <binder/ProcessState.h>
//#include "stbService.h"
using vendor::xxx::calculate::V1_0::ICalculate;
using android::hardware::defaultPassthroughServiceImplementation;
int main() {
    android::ProcessState::initWithDriver("/dev/binder");
    android::ProcessState::self()->setThreadPoolMaxThreadCount(4);
    android::ProcessState::self()->startThreadPool();
    return defaultPassthroughServiceImplementation<ICalculate>(4);
}