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Forum Index : Microcontroller and PC projects : Just need to clarify a couple of things

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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 994

Posted: 04:19am 07 Sep 2025

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I am setting up my first project for a 2350B development board upgrading from a 2040 project to get more i/o and have a couple of questions.

Firstly, am I right in assuming that Peter's labels SPI RX and SPI TX are Geoff's SPI MOSI and MISO respectively?

Secondly, can I allocate a dedicated SPI2 port for the SDCARD to avoid the CS clashing issue (and the additional circuitry)?

OA47

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2689

Posted: 05:11am 07 Sep 2025

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SPI Rx (receive = in) is MISO (master in, slave out)
SPI Tx (transmit = out) is MOSI (master out, slave in)
as the MCU is the master and the device is the slave.

If you have 4 pins to spare for SPI2 there would not be any need have SPI2 as there will be no need to share the CS pin. Any pin can be assigned to CS so each device can have it's own CS pin, so no clash..

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 994

Posted: 05:34am 07 Sep 2025

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Thankyou Phil.

OA47

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