The note A is 440Hz. 12 notes make an octave, A' has 880Hz
Next tone from A is A#(or Bb) with a frequency of 440 * 12th root of 2. So you can build or calculate the required frequencies.
Thanks for your answer,
I had already set up all my frequency with an external clock and using my wavedac but still don't know how to program it
thank a lot
"I had already set up all my frequency with an external clock"
The WaveDac needs a table with the values to output. So you need to generate a table for each tone. The API WaveDAC8_Wave1Setup(uint8 *WavePtr, uint16 NumberOfSamples) is used to introduce the table. When you cannot provide a table for each tone in flash you will need to compute it in sram.
there is old Application Note by Dave Van Ess, which is no longer available on Cypress site. It describes simple piano simulation using PSoC1. You have to re-write the code, as it is not directly compatible with PSoC5.
I suggest not to use WaveDAC at this moment, but to do it simply in code (see example AN2024). WaveDAC is more useful for continuous generation of the Sine, which is not a note (a note is amplitude modulated sine, having rise, decay, sustain and fall).
Also take a look on Theremin project by Tom Minnich
It runs on PSoC4, so must be closely compatible with PSoC5. It produces continuous sound though (like WaveDAC), but introduces DDS concept of tone tuning.