In a previous project I controlled a Neopixel LED array with spi257 @ 7.5MHz which worked fine (using IMP002)
In my current project spi257 was already taken so I took spi189 @ 7.5MHz to also here control a Neopixel array (also using IMP002)
Controlling the Neopixel kept on failing until I had a look at the https://electricimp.com/docs/api/hardware/spi/configure/
page and noticed the difference in possible data rates for spi257 and spi189: the range for spi189 being half of that of spi257. With more luck than knowledge I tried the setting for spi189 (3750) aligned with that for spi257 (7500) … and it worked!?
Can anyone explain and/or does anyone control Neopixel with spi189 on 7.5MHz successfully?