lkml.org 
[lkml]   [2020]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 1/4] pwm: pca9685: remove unused duty_cycle struct element
    Hello Matthias,

    as you seem to have this hardware on your desk, it would be great if you
    could answer the following questions:

    - Does the hardware complete the currently running period before
    applying a new setting?
    - Is this racy somehow (i.e. can it happen that when going from
    duty_cycle/period = 1000/5000 to duty_cycle/period = 4000/10000 the
    output is 1000/10000 (or 4000/5000) for one cycle)?
    - Does the hardware complete the currently running period before
    .enabled = false is configured?
    - How does the output pin behave on a disabled PWM. (Usual candidates
    are: freeze where is just happens to be, constant inactive and
    High-Z).

    Best regards
    Uwe

    --
    Pengutronix e.K. | Uwe Kleine-König |
    Industrial Linux Solutions | https://www.pengutronix.de/ |

    \
     
     \ /
      Last update: 2020-02-26 16:10    [W:4.113 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site