What is lighter on the processor? SPI with DMA or parallel data transmission to a TFT display?

[ABenz.11]

The task is to print measured data from sensors and actuators on a display.

The display of the data should not interfear with the high frequency measurement or the overal processor tasks.

STM32F4

[waclawek.jan]

As SPI is generally slower and both can use DMA, SPI is "lighter", but the refresh rate may be not satisfactory. Depends on the details. Build a prototype (perhaps using a Disco or Nucleo or any other suitable devboard) and try.

JW