diff options
| author | Jonathan Hogg <me@jonathanhogg.com> | 2022-03-07 09:03:49 +0000 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2022-03-07 23:41:29 +1100 |
| commit | 4c7c80d6266c6362253755c92bf649dc85c47dae (patch) | |
| tree | c63fa40061c2754bed1d7e2f76ab2bf1a328c81c /docs/esp32 | |
| parent | 33083bf52730fa1c238a154685a895b2775cc355 (diff) | |
| download | micropython-4c7c80d6266c6362253755c92bf649dc85c47dae.tar.gz micropython-4c7c80d6266c6362253755c92bf649dc85c47dae.zip | |
docs/esp32/quickref: Document GPIO drive strength.
Add brief documentation of the new `drive` keyword argument.
Diffstat (limited to 'docs/esp32')
| -rw-r--r-- | docs/esp32/quickref.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/esp32/quickref.rst b/docs/esp32/quickref.rst index da586819fd..56e765536e 100644 --- a/docs/esp32/quickref.rst +++ b/docs/esp32/quickref.rst @@ -160,6 +160,7 @@ Use the :ref:`machine.Pin <machine.Pin>` class:: p4 = Pin(4, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor p5 = Pin(5, Pin.OUT, value=1) # set pin high on creation + p6 = Pin(6, Pin.OUT, drive=Pin.DRIVE_3) # set maximum drive strength Available Pins are from the following ranges (inclusive): 0-19, 21-23, 25-27, 32-39. These correspond to the actual GPIO pin numbers of ESP32 chip. Note that many @@ -167,6 +168,15 @@ end-user boards use their own adhoc pin numbering (marked e.g. D0, D1, ...). For mapping between board logical pins and physical chip pins consult your board documentation. +Four drive strengths are supported, using the ``drive`` keyword argument to the +``Pin()`` constructor or ``Pin.init()`` method, with different corresponding +safe maximum source/sink currents and approximate internal driver resistances: + + - ``Pin.DRIVE_0``: 5mA / 130 ohm + - ``Pin.DRIVE_1``: 10mA / 60 ohm + - ``Pin.DRIVE_2``: 20mA / 30 ohm (default strength if not configured) + - ``Pin.DRIVE_3``: 40mA / 15 ohm + Notes: * Pins 1 and 3 are REPL UART TX and RX respectively |