Several modules on UEXT

Started by bilica, June 12, 2014, 12:42:07 AM

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Can several modules be attached to one UEXT port without conflict ?

I would like to use all of these together on a iMX233-OLinuXino-MINI-WiFi board:

+ MOD-LCD3310 (LCD)
+ MOD-RTC (Real time clock)
+ MOD-RFID125 (RFID Reader)

Thanks in advance!


Theoretically, as long as more than one of the modules does not use a point-to-point bus, they can share the UEXT port without conflicts. The only one UEXT point-to-point bus is the RS232 (serial port). MOD-LCD3310 uses SPI, MOD-RTC uses I2C, MOD-RFID125-BOX uses RS232, USB and SPI, so they could work together.



I think SPI needs one CS (chip select) pin per chip. UEXT looks like it has only one, so, i guess, only one SPI device is allowed on UEXT