Olimex Support Forum

OLinuXino Android / Linux boards and System On Modules => iMX233 => Topic started by: bilica on June 12, 2014, 12:42:07 am

Title: Several modules on UEXT
Post by: bilica on June 12, 2014, 12:42:07 am
Hi,

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!
Title: Re: Several modules on UEXT
Post by: MBR on June 13, 2014, 12:42:25 am
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.
Title: Re: Several modules on UEXT
Post by: bilica on June 13, 2014, 04:19:26 pm
Thanks MBR!
Title: Re: Several modules on UEXT
Post by: kostas on June 14, 2014, 11:43:35 am
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