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Raspberry Pi Pico
RaspberryPiPico

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At line 1 changed 3 lines
%%alias
Aliased from [Pico]
%%
On the 21st of January, 2021, the Raspberry Pi Foundation released its own [microcontroller] board called the __[Raspberry Pi Pico|RaspberryPiPico]__. Despite its name, the Pico is a __microcontroller__, not a small __microcomputer__ (i.e., a Single Board Computer or SBC) like the [Raspberry Pi], uses a different CPU chipset (the __RP2040__, a proprietary design by the Raspberry Pi Foundation), and is significantly smaller and cheaper than any Pi at ''US$4''.
At line 5 changed one line
On the 21st of January, 2021, the Raspberry Pi Foundation released its own [microcontroller] board called the __[Raspberry Pi Pico|RaspberryPiPico]__. Despite its name, the Pico is a __microcontroller__, not a small __microcomputer__ (i.e., a Single Board Computer or SBC) like the [Raspberry Pi], uses a different CPU chipset (the __[RP2040]__, a proprietary design by the Raspberry Pi Foundation), and is significantly smaller and cheaper than any Pi at ''US$4''.
It comes with a C SDK, a GCC-based toolchain, Visual Studio Code integration, and can be programmed in __[Micropython]__. The RP2040 CPU is currently available in the Pico form factor as released by the Raspberry Pi Foundation, but announcements have been made by many vendors like Adafruit and Pimoroni for Feather, Itsy Bitsy, QT, Tiny, and other familiar designs.
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It comes with a C SDK, a GCC-based toolchain, Visual Studio Code integration, and can be programmed in __[Micropython]__. The [RP2040] CPU is currently available in the Pico form factor as released by the Raspberry Pi Foundation, but announcements have been made by many vendors like Adafruit and Pimoroni for Feather, Itsy Bitsy, QT, Tiny, and other familiar designs.
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!! I2C
The RP2040 has two [I2C] controllers (0 and 1), both accessible via the Pico's GPIO pins, where the selection of SDA and SDL pins used for each controller is configured in software as per the following table:
|| I2C Controller || GPIO Pins
| I2C0 – SDA | GP0/GP4/GP8/GP12/GP16/GP20
| I2C0 – SCL | GP1/GP5/GP9/GP13/GP17/GP21
| I2C1 – SDA | GP2/GP6/GP10/GP14/GP18/GP26
| I2C1 – SCL | GP3/GP7/GP11/GP15/GP19/GP27
The I2C controller can run in master or slave mode (default slave address is 0x55); a choice of three speeds: Standard (0-100kB/s), Fast (up to 400kB/s) and Fast Plus (<=1000kB/s). The Raspberry Pi's default I2C frequency is 100kB/s, unless altered in /boot/config.txt. It can be used in either interrupt or DMA mode and includes transmit and receive buffers to
improve performance. There are [some I2C examples in Micropython|https://github.com/raspberrypi/pico-micropython-examples/tree/master/i2c] on github.
! Example Code
The first block sets the SDA and SCL pins for I2C Controller 0 to pin 8 and 9 (resp.), then writes 3 bytes of data to the slave address 76, then reads 4 bytes back from the same address. The second configures I2C Controller 1 to pin 6 and 7, then writes 3 bytes to memory address starting at 6, then reads 4 bytes starting at address 2 of the slave at memory address 76.
{{{
from machine import Pin, I2C
i2c = I2C(0, scl=Pin(9), sda=Pin(8), freq=100000)
i2c.scan() # scan for slaves, returning a list of 7-bit addresses
i2c.writeto(42, b'123') # write 3 bytes to slave with 7-bit address 42
i2c.readfrom(42, 4) # read 4 bytes from slave with 7-bit address 42
i2c = I2C(1, scl=Pin(7), sda=Pin(6), freq=100000)
i2c.scan()
i2c.readfrom_mem(42, 8, 3) # read 3 bytes from memory of slave 42,
# starting at memory-address 8 in the slave
i2c.writeto_mem(42, 2, b'\x10') # write 1 byte to memory of slave 42
# starting at address 2 in the slave
}}}
For further information consult the [documentation for the Micropython machine library for I2C|https://docs.micropython.org/en/latest/library/machine.I2C.html], or the [C++ API|https://raspberrypi.github.io/pico-sdk-doxygen/group__hardware__i2c.html]. Note that I2C can be established either via hardware or software on the Pico.
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*[An Introduction to the Raspberry Pi Pico with MicroPython|https://makersportal.com/blog/raspberry-pi-pico-tests-with-micropython], MakerPortal blog post by Joshua Hrisko, 28 Jan 2021
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[{Tag Pico RP2040}]
[{Tag Pico}]
This page (revision-15) was last changed on 2021-05-07 09:36 by Murray AltheimTop