Difference between revisions of "QT Py (RP2040 based)"

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* No Built-in support in MMBASIC for the on-board NEOPIXEL
 
* No Built-in support in MMBASIC for the on-board NEOPIXEL
 
* Red, Green, Blue LED
 
* Red, Green, Blue LED
* Pull Low to turn on RGB LED "bit"
+
* Pull Low to turn on RGB LED bits
 
* At-boot - RGB LED blinks Cyan/Green by MMBASIC
 
* At-boot - RGB LED blinks Cyan/Green by MMBASIC
** PIN(GP16) = 1:'Make RGB LED blink Blue/Off
 
 
* Red LED = GP17
 
* Red LED = GP17
 
* Green LED = GP16
 
* Green LED = GP16
Line 592: Line 591:
  
 
<pre>
 
<pre>
SETPIN GP16, DOUT
+
SETPIN GP17, DOUT:' Red LED
SETPIN GP17, DOUT
+
SETPIN GP16, DOUT:' Green LED
SETPIN GP25, DOUT
+
SETPIN GP25, DOUT:' Blue LED
 +
PIN(GP17)=1:' Turn off Red LED
 +
PIN(GP25)=1:' Turn off Blue LED
 +
PIN(GP16)=1:' Turn off Green LED
 +
PIN(GP17)=0:' Turn on Red LED
 +
PIN(GP25)=0:' Turn on Blue LED
 +
PIN(GP16)=0:' Turn on Green LED
  
 
</pre>
 
</pre>

Revision as of 13:38, 11 July 2022

Tindie-mediums.png

QTPy49 P18254-720px.jpg

QT Py RP2040.PNG XIAO-RP2040.PNG

Contents

RP2040 QT Py

  • Two manufacturers
  • USB Type C connector
  • RP2040 32-bit Cortex M0+ dual-core
  • Runs at ~125 MHz
  • 264 KB RAM
  • SPI FLASH chip for storing files and CircuitPython/MicroPython code storage
    • 8 MB - Adafruit
    • 2 MB - Seeedstudio
  • No EEPROM
  • Can be used with C/C++ (Arduino), 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)
    • I2C port
      • 2 I2C: 1 on QT pins, one on the (Adafruit) breakout pads - Adafruit
      • 1 I2C on XAIO
    • 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)

Pins (RP2040)

  • Pins are mapped differently in MicroPython between Seeeduino XIA and Adafruit QT Py
  • The Python board module virtualizes the difference

Adafruit RP2040

Adafruit QT Py RP2040 Product page

Adafruit products qtpy-rp2040-pins.png

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
  • GPIO29 in MicroPython
  • 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
  • GPIO28 in MicroPython
  • Analog In 1
  • Capacitive touch input
  • AREF pin.

A2 / D2 - Digital/analog GPIO pin 2

  • Digital I/O 2
  • GPIO27 in MicroPython
  • Analog In 2
  • PWM
  • Capacitive touch input.

A3 / D3 - Digital/analog GPIO pin 3

  • Digital I/O 3
  • GPIO26 in MicroPython
  • Analog In 3
  • PWM output
  • Capacitive touch input.

SDA / D4

  • Digital I/O 4
  • I2C SDA pin
  • PWM output
  • GPIO24 in MicroPython
  • 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
  • GPIO25 in MicroPython
  • 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
  • GPIO20 in MicroPython
  • Analog 6
  • PWM output
  • Capacitive touch input

RX / A7 / D7

  • Digital I/O 7
  • Receive (input) for Serial1
  • GPIO5 in MicroPython
  • Analog 7
  • PWM output
  • Capacitive touch input

SCK / A8 / D8

  • Digital I/O 8
  • SPI SCK pin
  • GPIO6 in MicroPython
  • Analog 8
  • PWM output

MISO / A9 / D9

  • Digital I/O 8
  • SPI MISO pin
  • GPIO4 in MicroPython
  • Analog 8
  • PWM output

MOSI / A10 / D10

  • Digital I/O 10
  • SPI MOSI pin
  • GPIO3 in MicroPython
  • Analog 10
  • PWM output

NeoPixel

  • NEOPIXEL LED Features
    • Individually addressable and programmable RGB LEDs
    • Operating voltage: 3.3V to 5V
    • Power consumption: 60mA per LED at full brightness
    • Communication: PWM through data pin
    • Driver IC: WS2812
  • Data = Pin 11
  • Power = Pin 12 - set low for low power usage
  • By default pin 12 is set high by Arduino/CircuitPython
  • NeoPixel 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

Seeeduino RP2040

There are 14 GPIO PINs on XIAO RP2040, on which there are 11 digital pins, 4 analog pins, 11 PWM Pins,1 I2C interface, 1 UART interface, 1 SPI interface, 1 SWD Bonding pad interface.

Seeed-xinpin-rp2040.jpg

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 / P26 - Digital/analog GPIO pin 0

  • board.D0
  • board.A0
  • P26 in Arduino/MicroPython
  • True analog output with 10 bit precision
  • PWM output

A1 / D1 / P27 - Digital/analog GPIO pin 1

  • board.D1
  • board.A1
  • P27 in Arduino/MicroPython
  • PWM output

A2 / D2 / P28 - Digital/analog GPIO pin 2

  • board.D2
  • board.A2
  • P28 in Arduino/MicroPython
  • PWM output

A3 / D3 / P29 - Digital/analog GPIO pin 3

  • board.D3
  • board.A3
  • P29 in Arduino/MicroPython
  • PWM output

SDA / D4 / P6

  • board.D4
  • board.SDA
  • P6 in Arduino/MicroPython
  • I2C SDA pin
  • PWM output
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

SCL / D5 / P7

  • board.D5
  • board.SCL
  • P7 in Arduino/MicroPython
  • I2C SCL
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V
  • PWM output

TX / D6 / P0

  • board.D6
  • board.TX
  • Transmit (output) for Serial1
  • P0 in Arduino/MicroPython
  • PWM output

RX / D7 / P1

  • board.D7
  • board.RX
  • Receive (input) for Serial1
  • P1 in Arduino/MicroPython
  • PWM output

SCK / D8

  • board.D8
  • board.SCK
  • SPI SCK pin
  • P2 in Arduino/MicroPython
  • PWM output

MISO / D9 / P4

  • board.D8
  • board.MISO
  • SPI MISO pin
  • P4 in Arduino/MicroPython
  • PWM output

MOSI / D10 / P3

  • board.D10
  • board.MOSI
  • SPI MOSI pin
  • P3 in Arduino/MicroPython
  • PWM output

On-board LEDs

XIAO LEDs xinfront-720px.jpg

  • Red Power LED
  • USER LED (RGB)
    • RED - P17
      • board.LED_RED
    • GRN - P16
      • board.LED_GREEN
      • LED_BUILTIN in Arduino
    • BLU - P25
      • board.LED_BLUE
    • Code to Blink 3 LEDs
  • NEOPIXEL LED Features
    • Individually addressable and programmable RGB LEDs
    • Operating voltage: 3.3V to 5V
    • Power consumption: 60mA per LED at full brightness
    • Communication: PWM through data pin
    • Driver IC: WS2812
    • NEOPIXEL Power - P11 - set low for low power usage
      • board.NEOPIXEL_POWER
    • NEOPIXEL Data - P12
      • board.NEOPIXEL
    • NEOPIXEL Demo

Programming

  • The RP2040 can be programmed in several languages/environments
    • C/C++
    • CircuitPython - best choice in most cases
    • MicroPython

C/C++

  • Can program in C/C++ using
    • Arduino IDE
    • Pico C++ SDK

C/C++ Adafruit RP2040 - Arduino

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
  • Tools > Board > Boards Manager
  • Search for RP2040
  • Scroll down to the Raspberry Pi Pico/RP2040 by Earle F Philhower, III entry
  • Click Install to install it
  • Tools > Boards menu
  • Navigate to the Raspberry Pi RP2040 Boards menu and choose Adafruit QT Py RP2040

C/C++ Seeeduino RP2040 - Arduino

https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

C/C++ RP2040

CircuitPython

  • CircuitPython is a derivative of MicroPython
  • CircuitPython is the best choice in most use-cases
    • Board specific support for both Seeed XAIO and Adafruit QT Py cards
  • Welcome To CircuitPython - Adafruit tutorial
  • Autorun code - 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
  • Mu code editor

CircuitPython for Adafruit QT Py RP2040

Install CircuitPython on Adafruit QT Py RP2040
Updating CircuitPython on Adafruit QT Py RP2040
  • 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

CircuitPython for Seeed XIAO RP2040

import board
dir(board)
['__class__', '__name__', 'A0', 'A1', 'A2', 'A3', 'D0', 'D1', 'D10', 'D2', 'D3', 'D4', 'D5', 'D6', 'D7', 'D8', 'D9', 'I2C', 'LED', 'LED_BLUE', 'LED_GREEN', 'LED_RED', 'MISO', 'MOSI', 'NEOPIXEL', 'NEOPIXEL_POWER', 'RX', 'SCK', 'SCL', 'SDA', 'SPI', 'TX', 'UART', 'board_id']

>>> print(board.board_id)
seeeduino_xiao_rp2040
Install CircuitPython on Seeed XIAO RP2040
  • Hold down the "BOOT" button. (The "B" is written on the board shown to the right)
  • Connect the XIAO RP2040 to your computer while you still pressing the button.
  • The computer then will appear a disk driver(RP1-RP2)
  • Download the XIAO-RP2040-CircuitPython.uf2 file for XIAO RP2040
  • Drag the .uf2 file to the disk driver("RP1-RP2")
  • Check the disk drive if the name has changed to "CIRCUITPY" (takes a few seconds)
  • Free memory
>>> import gc
>>> gc.mem_free()
208128
>>> import time
>>> gc.mem_free()
207952

CircuitPython Example Code

SSD1306 Display Examples
Digital I/O Examples
Land Boards I2CIO-8 (MCP23008) Examples
>>> dir(i2c)
['__class__', '__enter__', '__exit__', 'deinit', 'readfrom_into', 'scan', 'try_lock', 'unlock', 'writeto', 'writeto_then_readfrom']
Land Boards SWLEDX8-I2C (MCP23017) Examples
Land Boards PROTO16-I2C (MCP23017) Examples

MicroPython

MicroPython on XIAO RP2040

  1. Download and Install the latest version of Thonny editor according to your operating system
  2. Launch the Thonny IDE
  3. Click "Tools→Options" to open the settings.
  4. Step 4. Chose the "Interpreter" interface and select the device as "MicroPython(Raspberry Pi Pico)" and the port as "Try to detect prot automatically"
  5. Press and hold the "BOOT" button and then connect the XIAO RP2040 to the PC through the Type-C cable. If it works well, there is an "RPI-RP2" desk shown on the PC.
  6. Press the "Stop/Restart Backend" button and there will be a pop-up window that helps you install the MicroPython firmware on the board. The XIAO RP2040 uses the same chip as the Raspberry Pi Pico, thereby the XIAO RP2040 is compatible with Pico's MicroPython files.
  7. Write code (Neopixel example)
  8. Upload the codes by clicking the "Run current script" button. For the first time, Thonny will ask where you want to save your codes file. Both This Computer and Raspberry Pi Pico are fine.

MMBASIC on XIAO RP2040

QTPy49 MMBASIC P18412-720px.jpg

MMBASIC Credits

Peter Mather led the project, ported the MMBasic interpreter to the Raspberry Pi Pico and wrote the hardware device drivers. Geoff Graham wrote the MMBasic interpreter and the manual. Mick Ames wrote the PIO compiler and its corresponding documentation.

Install MMBASIC on Seeed XIAO RP2040

  • Hold down the "BOOT" button
    • The "B" is written on the board shown to the right
  • Connect the XIAO RP2040 via USB C cable to your computer while still pressing the button
  • The computer then will appear a disk driver(RP1-RP2)
  • Download the PicoMite_Firmware.zip
  • Drag the .uf2 file to the disk drive ("RP1-RP2")
  • Card will re-boot
  • Connect in TeraTerm over serial
  • Free memory
> print mm.ver
 5.070501

> memory

Program:
   0K ( 0%) Program (0 lines)
 124K (100%) Free

RAM:
   1K ( 1%) 3 Variables
   0K ( 0%) General
 155K (99%) Free

SD Card Wiring

Signal SD_CARD_X49 QTPy49 conn QTPy GP PiPico Pin
SPI_SCLK J1-3 J3-6 GP2 GPIO2
SPI_MOSI J1-4 J3-4 GP3 GPIO3
SPI_MISO J1-2 J3-5 GP4 GPIO4
SPI_SS J1-5 J9-3 GP26 GPIO26
GND J1-1 J9-1
VCC (3.3V) J1-7 J9-2

On-Board LED

  • No Built-in support in MMBASIC for the on-board NEOPIXEL
  • Red, Green, Blue LED
  • Pull Low to turn on RGB LED bits
  • At-boot - RGB LED blinks Cyan/Green by MMBASIC
  • Red LED = GP17
  • Green LED = GP16
  • Blue LED = GP25 (Used by MMBASIC)
SETPIN GP17, DOUT:' Red LED
SETPIN GP16, DOUT:' Green LED
SETPIN GP25, DOUT:' Blue LED
PIN(GP17)=1:' Turn off Red LED
PIN(GP25)=1:' Turn off Blue LED
PIN(GP16)=1:' Turn off Green LED
PIN(GP17)=0:' Turn on Red LED
PIN(GP25)=0:' Turn on Blue LED
PIN(GP16)=0:' Turn on Green LED

GPIO from MMBASIC

QTPy49 Marking GPIO
A0 GP26 (SD_SS)
A1 GP27
A2 GP28
A3 GP29
I2C_SDA GP6
I2C_SCL GP7
RX GP1
TX GP0

MMBASIC - Using Pins

  • Digital I/O
SETPIN GP27, DIN:' Digital Input
SETPIN GP28, DOUT:' Digital Output
PIN(GP28) = 1:'Digital output

  • Analog Input
SETPIN GP29, AIN:' Analog Input

  • SETPIN(s) for Serial and I2C
SETPIN GP1, GP0, COM1
SETPIN GP6, GP7 I2C2

SD Configuration

OPTION SYSTEM SPI GP2, GP3, GP4
OPTION SDCARD GP26

  • Verify it is working
> FILES
A:/
   <DIR>  basic
   <DIR>  bmps
   <DIR>  demos
   <DIR>  games
   <DIR>  jpegs
   <DIR>  lbcards
   <DIR>  performance
   <DIR>  wave
8 directories, 0 files

RS-232 (option)

DTE P562-720px.jpg

  • DCE or DTE card
  • Command to use serial
OPTION SERIAL CONSOLE GP0, GP1

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-P18253-720pxV.jpg

Videos