Pin drive strenth for SPI lines, question

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Spyy

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Hi,

I have problems with my SPI communication between my Teensy4.1 and a BT818 chip (EVE). I ran the SPI channel on the standard pins 10,11,12 and 13 at a speed of 30 Mhz to the EVE (which is the max value for the EVE, but also with 10 MHz the same problem) Sometimes it seems that the data communication gets corrupted. An expert for the EVE gave me a hint that the pins of the T4.1 are "only" able to drive 4 mA and this can cause the above metioned problems.
So...i do not know what is "normal" for SPI pin driving...my questions:

1. Is the value of 4 mA for T4.1 SPI pins correct, i read somewhere that they can drive 10mA?
2. Is there a way to change this value for the SPI somewhere?
3. Any other idea what can cause this (i have a pure 1:1 connection on the SPI lines between the T4.1 and the EVE, only the CS has a pullup of 47kOhms), lines are approx. 2-3 cm on a pcb long.

Thank you

Torsten
 
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