OpenHarmony L1（3.0）串口功能開發(fā)

1.編寫代碼生成對應(yīng)動態(tài)庫文件

shared_library("serial_service_api") { sources = [ "service/serial_service.cpp" ] include_dirs = ["include","service", ]

2.提供API接口

2.1依賴router模塊開發(fā)

void InitRouterModule(JSIValue exports)
{
JSI::SetModuleAPI(exports, "replace", RouterModule::Replace);
JSI::SetModuleAPI(exports, "init", RouterModule::Init);
JSI::SetModuleAPI(exports, "format", RouterModule::Format);
JSI::SetModuleAPI(exports, "write", RouterModule::Write);
JSI::SetModuleAPI(exports, "read", RouterModule::ReadFormat);
JSI::SetModuleAPI(exports, "disable", RouterModule::Disable);
JSI::SetModuleAPI(exports, "on", RouterModule::OnRead);    
COMMUNICATION::GetInstance()->SerialRead(RouterModule::ReadingCallback);
}

JSIValue ReadCallback = JSI::CreateUndefined();
void RouterModule::ReadingCallback(const char* buffer, int length)
{
if(!JSI::ValueIsUndefined(ReadCallback) && gSerialFlag){
if(length < 0){
           SERIAL_LOGI("JS ReadingCallback == 0");
           JSIValue evt = JSI::CreateString("error");
           JSI::CallFunction(ReadCallback, JSI::CreateUndefined(), &evt, 1);
return;
       } else if(length >= 0){
           SERIAL_LOGI("JS ReadingCallback == 1");
           JSIValue evt = JSI::CreateString(buffer);
           JSI::CallFunction(ReadCallback, JSI::CreateUndefined(), &evt, 1);
       }
   }
}
JSIValue RouterModule::OnRead(const JSIValue thisVal, const JSIValue *args, uint8_t argsSize)
{
if(!JSI::ValueIsUndefined(ReadCallback)){
      JSI::ReleaseValue(ReadCallback);
return JSI::CreateBoolean(false);
  }
if (JSI::ValueIsUndefined(args[0])) {
return JSI::CreateBoolean(false);
  }
  ReadCallback = JSI::GetNamedProperty(args[0], "ReadingCallback");
if(JSI::ValueIsUndefined(ReadCallback)){
      SERIAL_LOGI("Read Callbk is not got it");
  }
}

deps = [
"http://device/hals/communication/serial_port:serial_service_api",
]

2.2輕量級服務(wù)開發(fā)

extern void InitSerialPortModule(JSIValue exports);const Module OHOS_MODULES[] = {{"serialport", InitSerialPortModule},}

#! /bin/sh
sleep 1 && /bin/wms_server &
sleep 1 && /bin/wifi_server &
sleep 1 && /bin/util_server &
sleep 1 && /bin/serial_port_service &

FeaturePolicy serialServiceFeature[] = {
   {
NULL,
       {
           {
               .type = RANGE,
               .uidMin=0,
               .uidMax=__INT_MAX__,
           }
       },
   },
};
static PolicySetting g_presetPolicies[] = {
   {"serialportservice", serialServiceFeature, 1},
};

//繼承并重新定義服務(wù)：
struct SamgrSerialPortService {
   INHERIT_SERVICE;
   INHERIT_IUNKNOWNENTRY(DefaultFeatureApi);
   Identity identity;
};
static const char *GetName(Service *service)
{
//(void)service;
return SERIAL_PORT_SERVICE_NAME;
}
static int32 Invoke(IServerProxy *iProxy, int funcId, void *origin, IpcIo *req, IpcIo *reply)
{
   SerialPortService::RequestHandle(funcId, origin, req, reply);
return EC_SUCCESS;
}
//創(chuàng)建服務(wù)對象：
static SamgrSerialPortService SerialPortSvc = {
   .GetName = GetName,
   .Initialize = Initialize,
   .MessageHandle = MessageHandle,
   .GetTaskConfig = GetTaskConfig,
   SERVER_IPROXY_IMPL_BEGIN,
   .Invoke = Invoke,
   IPROXY_END,
};
//向SAMGR注冊服務(wù)及接口：
static void Init()
{ 
   SERIAL_LOGI("serial RegisterService Init, ver = %u", SerialPortSvc.ver);
bool ret = SAMGR_GetInstance()->RegisterService((Service *)&SerialPortSvc);
if (!ret) {
       SERIAL_LOGI("RegisterService error");
return;
   }
   ret = SAMGR_GetInstance()->RegisterDefaultFeatureApi(SERIAL_PORT_SERVICE_NAME, GET_IUNKNOWN(SerialPortSvc));
if (!ret) {
       SERIAL_LOGI("RegisterDefaultFeatureApi error");
return;
   }
   SERIAL_LOGI("serial RegisterService out, ver = %u", SerialPortSvc.ver);
}
SYSEX_SERVICE_INIT(Init);

3.開發(fā)應(yīng)用

3.1 簽名配置

3.2 調(diào)試命令

4.總結(jié)

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