PMC piezo driver: update wave tables - shrink in range 2V to 44V

[andreamerello]

The PMC piezo driver currently uses:

• precalculated tables to generate the waves required to drive piezo motor phases
• internally-generated ramps in range PIEZO_MINVOLTAGE to PIEZO_MAXVOLTAGE in order to brake and to go in freewheel state (which I don't know whether really works with those motors), and forced PIEZO_MINVOLTAGE in case of overcurrent.

Currently the tables were in range 128 to 65407 (DAC codes) while the PIEZO_MINVOLTAGE and PIEZO_MAXVOLTAGE lead to DAC codes in range 2760 to 60707.

This is clearly visible in this screenshot

According to G.Z:

• The purpose of clamping the operation range is to avoid driving the voltage outside electronic operating range i.e. otherwise the electronic may clamp the voltage.
• The correct operating range for the electronic is the one specified by PIEZO_MINVOLTAGE and PIEZO_MAXVOLTAGE constants

This lead to the conclusion that the wave tables should be recalculated to fit in the 2760 to 60707 range.

This PR updateds the tables and the generation script according to this.

The outcome is visible in the following screenshot. NOTE: It has been not tested on real HW.

[marcoaccame]

Hi @andreamerello: thanks very much for this change.

I believe you analysis is right. On the other hand you and G.Z. (aka @GiorgioZini) produced the original tables for this PZM driver.

We shall test the new tables on the pmc board (@simeonedussoni can you pls do that and report it on the PR?) and then we merge the code.

The PR has been idle too long because we could not perform tests on the pmc board. And in the meantime we decided to postpone the use of PZ motors.

[marcoaccame]

Hi @andreamerello thanks for your contribution. The changes you propose are fine and shall be merged. Sorry if we waited so long for this to happen.