基于DBC Signal Group生成Autosar SR接口（2）

前言

上一篇文章中，介绍了DBC中SignalGroup的提取，对于已经提取好的Group信息，就可以批量操作生成Simulink BUS及Simulink接口模型了。本文介绍这部分的脚本实现。

m脚本生成BUS数据类型

通过对前面导出的m文件分析，在第一个数据需要特殊处理，其他的正常按字符串写入就好了。参考代码如下：

for i = 1:length(can_signal_group_Struct)
    GroupName = can_signal_group_Struct(i).GroupName;


    outputParameter_str = strcat(GroupName,' = ',' Simulink.Bus;\n');
    fprintf(fid,outputParameter_str);
    outputParameter_str = strcat(GroupName,'.Description',' = '''';\n');
    fprintf(fid,outputParameter_str);
    outputParameter_str = strcat(GroupName,'.DataScope',' = ''Auto'';\n');
    fprintf(fid,outputParameter_str);
    outputParameter_str = strcat(GroupName,'.HeaderFile',' = ''Rte_Type.h'';\n');
    fprintf(fid,outputParameter_str);
    outputParameter_str = strcat(GroupName,'.Alignment',' = -1;\n');
    fprintf(fid,outputParameter_str);
    outputParameter_str = strcat(GroupName,'.PreserveElementDimensions',' = false;\n');
    fprintf(fid,outputParameter_str);
    for j = 1 : length(can_signal_group_Struct(i).DataType)
        SignalNameOut = can_signal_group_Struct(i).SignalName{j};
        SignalDataTypeOut = can_signal_group_Struct(i).DataType{j};
        if isempty(SignalDataTypeOut)
            SignalDataTypeOut = 'uint8';
        end
        if j == 1
            outputParameter_str = 'saveVarsTmp{1} = Simulink.BusElement;\n';
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}.Name = ''',SignalNameOut,''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}.Complexity = ''','real',''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'saveVarsTmp{1}.Dimensions = 1;\n';
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}.DataType = ''',SignalDataTypeOut,''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'saveVarsTmp{1}.Min = [];\n';
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'saveVarsTmp{1}.Max = [];\n';
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'saveVarsTmp{1}.DimensionsMode = ''Fixed'';\n';
            fprintf(fid,outputParameter_str);        
            outputParameter_str = 'saveVarsTmp{1}.SamplingMode = ''Sample based'';\n';
            fprintf(fid,outputParameter_str);  
            outputParameter_str = 'saveVarsTmp{1}.DocUnits = '''';\n';
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'saveVarsTmp{1}.Description = '''';\n';
            fprintf(fid,outputParameter_str);
        else
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)',' = Simulink.BusElement;\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Name = ''',SignalNameOut,''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Complexity = ''','real',''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Dimensions = 1;\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.DataType = ''',SignalDataTypeOut,''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Min = [];\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Max = [];\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.DimensionsMode = ''','Fixed',''';\n');
            fprintf(fid,outputParameter_str);        
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.SamplingMode = ''','Sample based',''';\n');
            fprintf(fid,outputParameter_str);  
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.DocUnits = '''';\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = strcat('saveVarsTmp{1}(',num2str(j),', 1)','.Description = '''';\n');
            fprintf(fid,outputParameter_str);
        end
        if j == length(can_signal_group_Struct(i).DataType)
            outputParameter_str = strcat(GroupName,'.Elements = saveVarsTmp{1};\n');
            fprintf(fid,outputParameter_str);
            outputParameter_str = 'clear saveVarsTmp;\n';
            fprintf(fid,outputParameter_str);

        end
    end
    fprintf(fid,'\n');
end
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此处我们只设定了组名称，信号名称，信号数据类型，其他的属性都是按默认值来的。

需要注意的是HeaderFile，因为我们使用Autosar代码生成，所以定义的结构体的头文件应该设置为Rte_Type.h，否则后面在生成代码时会报错找不到数据类型定义。

自动生成的m文件示例如下：

BrkPedlTrvl = Simulink.Bus;
BrkPedlTrvl.Description = '';
BrkPedlTrvl.DataScope = 'Auto';
BrkPedlTrvl.HeaderFile = 'Rte_Type.h';
BrkPedlTrvl.Alignment = -1;
BrkPedlTrvl.PreserveElementDimensions = false;
saveVarsTmp{1} = Simulink.BusElement;
saveVarsTmp{1}.Name = 'BrkPedlTrvlAct';
saveVarsTmp{1}.Complexity = 'real';
saveVarsTmp{1}.Dimensions = 1;
saveVarsTmp{1}.DataType = 'uint16';
saveVarsTmp{1}.Min = [];
saveVarsTmp{1}.Max = [];
saveVarsTmp{1}.DimensionsMode = 'Fixed';
saveVarsTmp{1}.SamplingMode = 'Sample based';
saveVarsTmp{1}.DocUnits = '';
saveVarsTmp{1}.Description = '';
saveVarsTmp{1}(2, 1) = Simulink.BusElement;
saveVarsTmp{1}(2, 1).Name = 'BrkPedlTrvlChks';
saveVarsTmp{1}(2, 1).Complexity = 'real';
saveVarsTmp{1}(2, 1).Dimensions = 1;
saveVarsTmp{1}(2, 1).DataType = 'uint8';
saveVarsTmp{1}(2, 1).Min = [];
saveVarsTmp{1}(2, 1).Max = [];
saveVarsTmp{1}(2, 1).DimensionsMode = 'Fixed';
saveVarsTmp{1}(2, 1).SamplingMode = 'Sample based';
saveVarsTmp{1}(2, 1).DocUnits = '';
saveVarsTmp{1}(2, 1).Description = '';
....
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运行该m文件，即可得到对应的结构体定义，示例如下：

建立Input模块及关联对应的BUS数据类型

在之前的文章中介绍过S/R接口的生成和mapping，此处不再详细介绍。

需要注意的是结构体类型在定义数据类型时的格式为：Bus: xxx,所以在创建Input模块时需要注意下

    GroupDataTypeStr = strcat('Bus:',32,can_signal_group_Struct(i).GroupName);
    handle = add_block('simulink/Sources/In1',RTEInput_ParameterName,'OutDataTypeStr',GroupDataTypeStr,...
        'PortDimensions',num2str(1),'BusOutputAsStruct','on');
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此处对于BusOutputAsStruct属性，需要配置为on，否则生成代码会报错

实现效果

自动生成Port及mapping

编译生成arxml

导入Autosar工具中

总结

通过脚本实现Group类型的Port自动创建，可以节约一定的开发时间，对于重复性较高的工作，建议开发脚本实现半自动或自动化。