topic FlexIO Question: Simultaneous Peripheral Use? in i.MX RT Crossover MCUs

FlexIO Question: Simultaneous Peripheral Use?

lsrbigfoot — Thu, 20 Jul 2023 19:39:18 GMT

Can a single FlexIO peripheral be used to perform 2 transactions at once?

For example, FlexIO2 pins (shifters, and timers) were allocated for two (2) separate SPI ports connected to different devices. Can FlexIO2 be configured to initiate SPI transactions on both ports simultaneously? Or must each FlexIO2 transaction happen one port at a time?

Re: FlexIO Question: Simultaneous Peripheral Use?

EdwinHz — Tue, 25 Jul 2023 20:48:49 GMT

Hi @lsrbigfoot,

The FlexIO peripheral is not capable of preforming two transactions at once. You can definitely connect more than one device to the same SPI pins from the FlexIO, but it would have to be according to the SPI specification, where SCLK, MOSI and MISO are in a shared bus, and the CS lines are connected directly to each device.

BR,
Edwin.