Difference between revisions of "QT Py (SAMD based)"

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(Created page with "== Two Versions of the QT Py == * AdaFruit and Seeed Studio have SAMD21 and RP2040 versions of the QT Py (XIAO on Seeed Studio) ** Same pinouts/form factors * RP2040 vs SAM v...")
 
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== Two Versions of the QT Py ==
+
== SAMD21 QT Py==
 
 
* AdaFruit and Seeed Studio have SAMD21 and RP2040 versions of the QT Py (XIAO on Seeed Studio)
 
** Same pinouts/form factors
 
* RP2040 vs SAM version
 
** RP2040 is faster (125 MHz vs 48 MHz)
 
** RP2040 has 2 cores vs 1
 
** RP2040 has more Flash
 
** RP2040 has more SRAM
 
** The RP2040 version is more expensive, but about the same cost if the SAM version is used with an external Flash
 
* [https://www.seeedstudio.com/blog/2020/01/09/samd21-arduino-boards-which-one-should-you-use/ SAMD21/RP2040 Arduino Boards – Which 32-bit Microcontrollers should you use?]
 
 
 
[[file:XIAO_SAM_vs_XIAO_RP2040.PNG]]
 
 
 
=== SAMD21 QT Py===
 
  
 
[[File:QT_Py_4600-06.jpg]]
 
[[File:QT_Py_4600-06.jpg]]
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* USB Type C connector
 
* USB Type C connector
  
=== RP2040 QT Py ===
+
== Links ==
 
 
[[file:QT Py RP2040.PNG]]
 
 
 
[[file:XIAO-RP2040.PNG]]
 
 
 
<video type="youtube">00t5y4nQlH8</video>
 
 
 
* [https://www.adafruit.com/product/4900 Adafruit QT Py RP2040 Product page] or [https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html Seeed XIAO RP2040 Product page]
 
* USB Type C connector
 
* RP2040 32-bit Cortex M0+ dual-core
 
* Runs at ~125 MHz
 
* 264 KB RAM
 
* 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage (Adafruit), 2 MB SPI Flash (Seeedstudio)
 
** No EEPROM
 
* Can be used with MicroPython or CircuitPython
 
* Built-in RGB NeoPixel LED
 
* 13 GPIO pins (11 breakout pads and two QT pads):
 
** Four 12 bit ADCs (one more than Pico)
 
** Two I2C ports (one on the QT connector, one on the breakout pads)
 
** SPI and UART peripherals, in standard QT Py locations,
 
** PWM outputs on every IO pin - for servos, LEDs, etc
 
** There are 6 GPIO in consecutive order for PIO compatibility
 
* 3.3V logic and power 600 mA
 
* Both Reset button and Bootloader select buttons for quick restarts (no unplugging-replugging to relaunch code)
 
 
 
=== Links ===
 
  
 
* [https://circuitpython.org/board/qtpy_m0/ Adafruit QT Py page]
 
* [https://circuitpython.org/board/qtpy_m0/ Adafruit QT Py page]
 
* [https://learn.adafruit.com/adafruit-qt-py Adafruit Learning System for QT Py]
 
* [https://learn.adafruit.com/adafruit-qt-py Adafruit Learning System for QT Py]
  
== Pins (SAMD version) ==
+
== Pins ==
  
 
[[file:adafruit_products_Adafruit_QT_Py_SAMD21_pinout.png|link=https://cdn-learn.adafruit.com/assets/assets/000/110/643/original/adafruit_products_Adafruit_QT_Py_SAMD21_pinout.png?1649443234]]
 
[[file:adafruit_products_Adafruit_QT_Py_SAMD21_pinout.png|link=https://cdn-learn.adafruit.com/assets/assets/000/110/643/original/adafruit_products_Adafruit_QT_Py_SAMD21_pinout.png?1649443234]]
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=== C/C++ ===
 
=== C/C++ ===
  
* [https://learn.adafruit.com/adafruit-qt-py/arduino-ide-setup Arduino IDE Setup for SAMD version]
+
* [https://learn.adafruit.com/adafruit-qt-py/arduino-ide-setup Arduino IDE Setup]
 
** Requires Arduino IDE version 1.8 or higher
 
** Requires Arduino IDE version 1.8 or higher
 
** Add https://adafruit.github.io/arduino-board-index/package_adafruit_index.json to Preferences Additional Boards Manager URLs
 
** Add https://adafruit.github.io/arduino-board-index/package_adafruit_index.json to Preferences Additional Boards Manager URLs
 
** [https://learn.adafruit.com/adafruit-qt-py/using-with-arduino-ide Add Adafruit SAMD Boards in Boards Manager]
 
** [https://learn.adafruit.com/adafruit-qt-py/using-with-arduino-ide Add Adafruit SAMD Boards in Boards Manager]
* [https://github.com/raspberrypi/pico-sdk RP2040 C/C++ SDK]
 
  
 
=== CircuitPython/MicroPython ===
 
=== CircuitPython/MicroPython ===
 
* [https://github.com/micropython/micropython/tree/master/ports/rp2 RP2040 MicroPython Repo]
 
* [https://learn.adafruit.com/adafruit-qt-py-2040 Adafruit QT Py RP2040 Overview]
 
 
==== Install CircuitPython on QT Py RP2040 ====
 
 
* Hold down the BOOT (right) button while plugging it into USB
 
* Download [ UF2 from [https://circuitpython.org/board/adafruit_qtpy_rp2040/ Adafruit QT Py CircuitPython RP2040]
 
* Drive will open
 
* Drop UF2 onto drive
 
 
<pre>
 
>>> import gc
 
>>> gc.mem_free()
 
208128
 
>>> import time
 
>>> gc.mem_free()
 
207952
 
</pre>
 
 
=== CircuitPython ===
 
  
 
==== CircuitPython for SAMD ====
 
==== CircuitPython for SAMD ====

Revision as of 18:33, 10 June 2022

SAMD21 QT Py

QT Py 4600-06.jpg

  • Adafruit QT Py SAMD21 Product Page Seeeduino XIAO
    • ATSAMD21E18 32-bit Cortex M0+ version
    • 48 MHz, 32-bit processor
    • 256KB Flash
    • 32 KB RAM
  • Native USB supported by every OS
    • Can be used in Arduino or CircuitPython as USB serial console, MIDI, Keyboard/Mouse HID, even a little disk drive for storing Python scripts.
  • Built in RGB NeoPixel LED
  • 11 GPIO pins:
    • True analog output on one I/O pin
      • Can be used to play 10-bit quality audio clips in Arduino
        • CircuitPython does not have storage for audio clips
    • 9 x 12-bit analog inputs (SDA/SCL do not have analog inputs)
    • 1 x Optional AREF on A1
    • 9 x PWM outputs (A0 is analog out, A1 is not PWM capable)
    • Hardware I2C port with STEMMA QT plug-n-play connector
    • Hardware UART
    • Hardware SPI
    • Hardware I2S
    • 6 x Capacitive Touch with no additional components required
  • 3.3V regulator with 600mA peak output AP2112
  • Optional SOIC-8 SPI Flash chip on bottom (Adafruit board - not Seeedstudio part)
    • Can't use castellated pins if Flash on bottom is installed
    • GD25Q16
    • Access the SPI flash in Arduino on SPI1 and chip select pin 17
    • In CircuitPython, a 'haxpress' version of the runtime will need to be installed, so it knows to look for the larger filesystem
    • There is more hardware support in the haxpress CircuitPython build because we can add more code to the internal flash instead of using it for a filesystem
      • Built-in modules available: adafruit_pixelbuf, analogio, audiobusio, audiocore, audioio, board, busio, digitalio, displayio, errno, fontio, math, microcontroller, neopixel_write, nvm, onewireio, os, paralleldisplay, pulseio, pwmio, rainbowio, random, rotaryio, rtc, storage, struct, supervisor, terminalio, time, touchio, traceback, usb_cdc, usb_hid, usb_midi
  • Reset switch for starting your project code over or entering bootloader mode
  • USB Type C connector

Links

Pins

Adafruit products Adafruit QT Py SAMD21 pinout.png (Click on image for larger file)

3V

  • Regulated output from the onboard regulator. You can draw 500mA

5V

  • 5v out from the USB port.
  • Voltage input
    • Requires external diode
      • Schottky, signal, power
      • Between external power source and this pin
      • Cannot power the USB port by supplying 5V to this pin
        • There is a protection diode that prevents the 5V from reaching the USB connector.
        • This is to protect host computer USB ports, etc.

A0 / D0 - Digital/analog GPIO pin 0

  • Digital I/O 0
  • Analog In 0
  • True analog output with 10 bit precision
  • Does not have PWM
  • Capacitive touch input.

A1 / D1 - Digital/analog GPIO pin 1

  • Digital I/O 1
  • Analog In 1
  • Capacitive touch input
  • AREF pin.

A2 / D2 - Digital/analog GPIO pin 2

  • Digital I/O 2
  • Analog In 2
  • PWM
  • Capacitive touch input.

A3 / D3 - Digital/analog GPIO pin 3

  • Digital I/O 3
  • Analog In 3
  • PWM output
  • Capacitive touch input.

SDA / D4

  • Digital I/O 4
  • I2C SDA pin
  • PWM output
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

SCL / D5

  • Digital I/O 5
  • I2C SCL
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

TX / A6 / D6

  • Digital I/O 6
  • Transmit (output) for Serial1
  • Analog 6
  • PWM output
  • Capacitive touch input

RX / A7 / D7

  • Digital I/O 7
  • Receive (input) for Serial1
  • Analog 7
  • PWM output
  • Capacitive touch input

SCK / A8 / D8

  • Digital I/O 8
  • SPI SCK pin
  • Analog 8
  • PWM output

MISO / A9 / D9

  • Digital I/O 8
  • SPI MISO pin
  • Analog 8
  • PWM output

MOSI / A10 / D10

  • Digital I/O 10
  • SPI MOSI pin
  • Analog 10
  • PWM output

NeoPixel

  • Connected to digital pin 11 for signal
  • Set pin 12 low for low power usage
  • By default pin 12 is set high by Arduino/CircuitPython
  • Code example
import board
import neopixel

pixels = neopixel.NeoPixel(board.NEOPIXEL, 1)
# fill((rVal, gVal, bVal))
# rVal, gVal, bVal = red/green/blue values (0-255)
pixels.fill((255, 0, 0))  # Note double parens

Programming

  • C/C++ or CircuitPython

C/C++

CircuitPython/MicroPython

CircuitPython for SAMD

  • Adafruit CircuitPython 7.3.0 on 2021-01-21
    • CircuitPython is a derivative of MicroPython
    • CircuitPython looks for a code file on the board to run
      • There are four options: code.txt, code.py, main.txt and main.py
      • CircuitPython looks for those files, in that order, and then runs the first one it finds
    • QT_Py_blink.py
    • QT Py Haxpress used with 2MB Flash EEPROM
  • Mu code editor
  • Free memory
    • Reports 17,776 bytes of free space
import gc
gc.mem_free()
Updating CircuitPython
  • Save the contents of CIRCUITPY, just in case
  • Double-click the reset button to show the BOOT drive
  • Drag the update-bootloader .uf2 file to the BOOT drive
  • Wait a few tens of seconds for the bootloader to update; the BOOT drive will reappear
  • Check INFO_UF2.TXT to verify that the bootloader version has been updated. Then you will need to reload CircuitPython.
  • Update mpy files

Land Boards CircuitPython Code

I2CIO-8 (MCP23008) Drivers
SWLEDX8-I2C (MCP23017) Drivers
PROTO16-I2C (MCP23017) Drivers

Digital I/O Example

import board
import digitalio
import time

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT

while True:
    led.value = True
    time.sleep(0.1)
    led.value = False
    time.sleep(0.5)

Flash EEPROM 2 MB

QT Py 4600-07.jpg

QT Py Breakout Board

QT Py Breakout P18212-720px.jpg

  • Built onto GRID49 card
  • Socket for QT Py
  • QT Py pins brought to header strips
  • 3.3V power distribution on 2x8 header

Pins (CCW direction)

  • S12 = A0
  • R12 = A1
  • Q12 = A2
  • P12 = A3
  • N12 = SDA
  • M12 = SCL
  • L12 = TX
  • L1 = RX
  • M1 = SCK
  • N1 = MI
  • P1 = MO
  • Q1 = 3.3V
  • R1 = GND
  • S1 = 5V
  • A6=B6=C6=D6=E6=F6=G6=H6 = GND
  • A7=B7=C7=D7=E7=F7=G7=H7 = 3.3V

QTPy49 Board

QTPy49 FRONT REV1.png

Videos