Lerking/micropython
1
0
Fork 0
mirror of https://github.com/micropython/micropython.git synced 2026-04-30 04:40:13 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity
18,322 Commits 6 Branches 74 Tags
dependabot/github_actions/actions/github-script-9
Commit Graph

2 Commits

Author SHA1 Message Date
robert-hh 72e67f0f02 samd/machine_bitstream: Tune ticks for SAMD51 and set pin to output. 
Changes in this commit:
- Change ticks overhead value for SAMD51.  The value was too large and thus
  timing was quite bad.  At 120Mhz it's now within +/- 30ns.
- Set the pin to output mode.  That way, all Pin identifiers are accepted
  as argument, not only Pin objects.

Tested with ItsyBitsy M4 and M0 boards.

Signed-off-by: robert-hh <robert@hammelrath.com>
 2025-10-25 22:56:47 +11:00
robert-hh a415752173 samd/machine_bitstream: Add the machine.bitstream() function. 
The SAMD21 implementation is an adaption of @jimmo's code for STM32Lxx.
The only changes are the addresses and names of the port registers and the
timing parameters.

SAMD21: The precision is about +/-25ns at 48MHz clock frequency.  The first
two cycles are about 40-60 ns longer than set.  But still good enough to
drive a neopixel device.

SAMD51: The precision is about +/-30ns at 120MHz clock frequency.  Good
enough to drive a neopixel device.
 2022-10-06 23:00:00 +11:00