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5
ports/raspberrypi/bindings/rp2pio/__init__.c
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@ -17,6 +17,11 @@
//| introduction and guide to working with PIO in CircuitPython, see `this
//| Learn guide <https://learn.adafruit.com/intro-to-rp2040-pio-with-circuitpython>`_.
//|
//| .. warning:: Using PIO inputs on Raspberry Pi RP2350 A2 stepping has some limitations
//| due to a GPIO hardware issue that causes excessive leakage current (~120uA).
//| A pin can read as high even when driven or pulled low, if the input signal is high
//| impedance or if an attached pull-down resistor is too weak (has too high a value).
//| See the warning in `digitalio` for more information.
//| """
//|

21
shared-bindings/digitalio/__init__.c
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@ -58,6 +58,27 @@
//|
//| For more information on using `digitalio`, see `this additional Learn guide
//| <https://learn.adafruit.com/circuitpython-digital-inputs-and-outputs>`_
//|
//| .. warning:: `digitalio.DigitalInOut` on Raspberry Pi RP2350 A2 stepping has some limitations
//| due to a GPIO hardware issue that causes excessive leakage current (~120uA).
//| A pin can read as high even when driven or pulled low, if the input signal is high
//| impedance or if an attached pull-down resistor is too weak (has too high a value).
//|
//| To prevent this problem, drive the the input pin with a strong signal that can overcome
//| the leakage current. If you need to use a pull-down,
//| connect a strong external pull-down resistor that is 8.2k ohms or less.
//|
//| The internal pull-down resistor (``digitalio.DigitalInOut.pull = digitalio.Pull.DOWN``)
//| is not strong enough, and is not useful.
//|
//| Typical push-pull outputs from attached peripherals or other microcontrollers will drive
//| input pins adequately, with no resistor needed.
//|
//| There is no problem when pull-ups are used, even weak ones. Using the internal pull-up resistor
//| (``digitalioDigitalInOut.pull = digitalio.Pull.UP``) will work fine.
//|
//| For more information, see the RP2350-E9 erratum in the
//| `RP2350 datasheet <https://datasheets.raspberrypi.com/rp2350/rp2350-datasheet.pdf>`_
//| """
static const mp_rom_map_elem_t digitalio_module_globals_table[] = {

6
shared-bindings/keypad/__init__.c
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@ -70,6 +70,12 @@ const mp_obj_property_t keypad_generic_events_obj = {
//| For more information about working with the `keypad` module in CircuitPython,
//| see `this Learn guide <https://learn.adafruit.com/key-pad-matrix-scanning-in-circuitpython>`_.
//|
//| .. warning:: Using pull-downs with `keypad` on Raspberry Pi RP2350 A2 stepping has some limitations
//| due to a GPIO hardware issue that causes excessive leakage current (~120uA).
//| A pin can read as high even when driven or pulled low, if the input signal is high
//| impedance or if an attached pull-down resistor is too weak (has too high a value).
//| See the warning in `digitalio` for more information.
//|
//| .. jinja
//| """

3
shared-bindings/touchio/__init__.c
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@ -28,6 +28,9 @@
//| For more information about working with the `touchio` module in CircuitPython,
//| see `this Learn guide page <https://learn.adafruit.com/circuitpython-essentials/circuitpython-cap-touch>`_.
//|
//| **Limitations**: `touchio` is available on Raspberry Pi RP2040 builds,
//| but not on RP2350, due to GPIO hardware limitations.
//|
//| Example::
//|
//| import touchio