diff options
| author | robert-hh <robert@hammelrath.com> | 2022-07-31 11:09:57 +0200 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2022-09-13 18:35:48 +1000 |
| commit | 0f048a5a2a4cb239784cd152c9cd3fa0deb86db7 (patch) | |
| tree | 38e03906301b47ae189d76492d4e6558062e6d9f /docs/mimxrt/quickref.rst | |
| parent | 8e542251405d780f7aa0d6c9abaa30282dd360d5 (diff) | |
mimxrt/machine_spi: Allow a setting of -1 for cs in the constructor.
In that case, no Pin will be configured for the CS signal, even if it is
internally still generated. That setting allows to use any pin for CS,
which then must be controlled by the Python script.
Also make the default cs=-1 to match other ports (software CS).
Diffstat (limited to 'docs/mimxrt/quickref.rst')
| -rw-r--r-- | docs/mimxrt/quickref.rst | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/mimxrt/quickref.rst b/docs/mimxrt/quickref.rst index 0a14c632a..c75fe60c8 100644 --- a/docs/mimxrt/quickref.rst +++ b/docs/mimxrt/quickref.rst @@ -301,13 +301,19 @@ There are up to four hardware SPI channels that allow faster transmission rates (up to 30Mhz). Hardware SPI is accessed via the :ref:`machine.SPI <machine.SPI>` class and has the same methods as software SPI above:: - from machine import SPI + from machine import SPI, Pin spi = SPI(0, 10000000) + cs_pin = Pin(6, Pin.OUT, value=1) + cs_pin(0) spi.write('Hello World') + cs_pin(1) For the assignment of Pins to SPI signals, refer to :ref:`Hardware SPI pinout <mimxrt_spi_pinout>`. +The keyword option cs=n can be used to enable the cs pin 0 or 1 for an automatic cs signal. The +default is cs=-1. Using cs=-1 the automatic cs signal is not created. +In that case, cs has to be set by the script. Clearing that assignment requires a power cycle. Notes: |