Hello Community,
I tried during this week-end to find out what could be the origin of the IIC detection problem. I can now affirm that is not a connection problem. But some things seam strange to me. Electrical observations (according to MBHP_CORE_STM32F4 module schematic) :
When plugged on J4A :
- on the core module, continuity between PB10 & PB11 (in one way only) > is this normal ? effect of D1 ?
- on the quad IIC module, 5V between Vs and Vd > ok
- on the quad IIC module, 3.7V between Vs and Sc > ok
- on the quad IIC module, 5V between Vs and Sd > is this normal ? no effect of R8A ? I test the resistor alone, 2.2Kohm ok.
--> Maybe because R7A and R8A are connected together ? Normal ?
When plugged on J4B :
- on the core module, no continuity between PB6 & PB9 > seams more normal to me, but different to J4A
- on the quad IIC module, 5V between Vs and Vd > ok
- on the quad IIC module, 3.7V between Vs and Sc > ok
- on the quad IIC module, 3.7V between Vs and Sd > seams normal, but different to J4A
I read that the IIC module was "Plug & Play", then I guess there is no need to boot/load a firmware for this module ? Am I right ? I'm not 100% sure ... At this time, I do nothing with the soft, only hardware building then plug.
I also see the "IIC Midi sw Loopback" to test the module, but I don't have the necessary computer skill to use it ...
J4B seams to have a more normal behaviour to me than J4A. But there are 4 IIC in the seq, that means only J4A is detected ? How to extend to 8 IIC midi OUT ports ? Maybe J4B would work ?
Thanks all of you.
Warm regards & Peace.
Fanch