Approve minimum PWM and delta PWM

[huanmel]

As written in LLR 2, 18, 14 and 15 PWM should be minimum 10% and increased and decrease by 10%.
Duty of PWM is coded by value in [0..255].
I see 2 way of implementation

1. suggest to use 10 % as fixed value where minimum and delta of PWM duty are equal = 25.
   In this case 100% = 250. It's not fulled to 255.
2. Another way to make duty = command in percent * 255 and rounded to nearest integer. For changing duty (+/- 10 %) there's need to store the previous command in percent in some varaible, may be to use additional field in APPLICATION_DATA.duty.
   What do you think we need ?

[rustedmind]

25 - 250 range is ok
The main issue with percents - they are in double and precision will be lost. Furthermore, rounding algorithms are quite expensive in terms of performance.

[huanmel]

I've made 2 variant with rounding yet, if so can remake with fixed steps
later.

2016-11-14 13:40 GMT+03:00 rustedmind notifications@github.com:

25 - 250 range is ok
The main issue with percents - they are in double and precision will be
lost. Furthermore, rounding algorithms are quite expensive in terms of
performance.

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С уважением, Иван