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 | |
| 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')
| -rw-r--r-- | docs/mimxrt/pinout.rst | 3 | ||||
| -rw-r--r-- | docs/mimxrt/quickref.rst | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/docs/mimxrt/pinout.rst b/docs/mimxrt/pinout.rst index b82c153fc..ef53fa63b 100644 --- a/docs/mimxrt/pinout.rst +++ b/docs/mimxrt/pinout.rst @@ -322,7 +322,8 @@ Olimex RT1010Py - CS0/-/SDO/SDI/SCK SDCARD wi Seeed ARCH MIX J4_12/-/J4_14/J4_13/J4_15 J3_09/J3_05/J3_08_J3_11 ================= ========================= ======================= =============== -Pins denoted with (*) are by default not wired at the board. +Pins denoted with (*) are by default not wired at the board. The CS0 and CS1 signals +are enabled with the keyword option cs=0 or cs=1 of the SPI object constructor. .. _mimxrt_i2c_pinout: 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: |