This can be solved pretty easily using the Sine Wave block. If you ever want to see which blocks are supported for code generation you can use the command >>showblockdatatypetable . This table will give you a list of every block and its support with Code Generation.
In this case, Sin Wave is supported. So you can use the sin wave block in your model and if you want the parameters to be run time tunable I would use a Simulink.Parameter Object. Simply define >>myParam = Simulink.Paramameter
Goto the workspace double click on myParam and change the value to the initial parameter value and ExportedGlobal. Now use myParam in your block parameters of your Sin Wave block. When you generate code you will end up with a variable called myParam that you can tune. You can do this for all of the settings of the Sin Wave block.