MicroPython Forum (Archive)

Hi Roberthh, I also tried now the Viper Code emitter. The minimal reachable low time is now 4,4µs... So also not sufficiant. Meanwhile I switched to C-Implementation. Here I could reach the tick time - even below 3µs with timer interrupt programming. Thanx for your support and for the example code. ...

I tried it one time again with direct register access of the GPIO in the ISR. The low-time goes to 15,20µs - which is not sufficiant. The problem would be the slow ISR-call on Python level as you mentioned - I think. So it makes no difference if the ISR itselfes is native C or not. So - I switch to ...

Hi Peter, I already found this out. What do you think about my implementation idea according the bit-generation: "Is it shure, that the timer callback will be performed all 3µs when I install it like this: tim = pyb.Timer(1) tim.init(freq=333333) tim.callback(tick) The callback "tick" then would be ...

Thanx Roberthh,

unfortunately my self-compiled OLIMEX-H405 port (STM32) has not yet the RMT module. May be I can add this?
But I think not - its an other processor...

But nevertheless thanx for the code - I have the same challange with the CRC

best regards
Mario

Hi pythoncoder, thanx for the fast reply. So as a mentioned - inline C or assembler would be possible. So I try to implement the bit generator in C as a Timer callback. Is it shure, that the timer callback will be performed all 3µs when I install it like this: tim = pyb.Timer(1) tim.init(freq=333333...

Hallo *, I planned to implement a simulator for the SENT-Interface (Single Edge Nibble Transmission) in Micropython in an OLIMEX STM32-H405 board. Unfortunately I found out, that the Micropython Main loop is too slow for the bit generation according to the SENT-Spec. I need at least a 9µs low-pulse ...