26 lines
1.3 KiB
ReStructuredText
26 lines
1.3 KiB
ReStructuredText
Digital I/O
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===========
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Board-Specific Pins
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-------------------
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The Raspberry Pi Pico RP2040 chip supports up to 30 digital I/O pins,
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however not all boards provide access to all pins.
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Pin Notation
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------------
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When using Analog or Digital I/Os, if you supply an integer it specifies the RP2040 GPIO pin to use. Using Dx or Ax notation (for example, D4 or A3) may be necessary on boards without a direct PCB pin to GPIO mapping.
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Input Modes
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-----------
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The Raspberry Pi Pico has 3 Input modes settings for use with `pinMode`: `INPUT`, `INPUT_PULLUP` and `INPUT_PULLDOWN`
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Output Modes (Pad Strength)
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---------------------------
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The Raspberry Pi Pico has the ability to set the current that a pin (actually the pad associated with it) is capable of supplying. The current can be set to values of 2mA, 4mA, 8mA and 12mA. By default, on a reset, the setting is 4mA. A `pinMode(x, OUTPUT)`, where `x` is the pin number, is also the default setting. 4 settings have been added for use with `pinMode`: `OUTPUT_2MA`, `OUTPUT_4MA`, which has the same behavior as `OUTPUT`, `OUTPUT_8MA` and `OUTPUT_12MA`.
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Tone/noTone
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-----------
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Simple square wave tone generation is possible for up to 8 channels using
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Arduino standard ``tone`` calls. Because these use the PIO to generate the
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waveform, they must share resources with other calls such as ``I2S`` or
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``Servo`` objects.
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