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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@mrQ
yes, i had it all written in JS, but changed then to asm because of the high DMA setup costs in JS. In JS it took approx. 7ms, which results at eff. 5MBaud in 4375 byte. or in other words - transmissions of less than 4,4kbyte would be LESS efficient using DMA over the native SPI implementation. with asm i could reduce the time by approx. 80%, so DMA makes sense for any packet >500byte.
regarding the ILI93141 module: on the standard module only the fillrect benefits from DMA, for the ILI93141pal things are a bit better. but at the end i decided to replace both with my own ILI9341 driver, adding some pretty features such as smoothed fonts (incl. the font generator necessary to build them from any google font). if you like, i can provide it to you in the next days.