29 917
modifications
Modifications
Sauter à la navigation
Sauter à la recherche
Ligne 1 :
Ligne 1 : − − {{traduction}} Ligne 121 :
Ligne 119 : − xxx+ + + + + + + + + + + + − + − + − + − + − + − + + + + + + − [[fichier:ENG-CANSAT-PICO-PINOUT-33.png]]+ + + + + + + + − REPL on UART(0)+ Ligne 143 :
Ligne 164 : − + − + − + − + + + − + − +
ENG-CANSAT-PICO-USER-GUIDE (voir la source)
Version du 26 février 2022 à 01:25
, 26 février 2022 à 01:25→UARTs
{{ENG-CANSAT-PICO-NAV}}
{{ENG-CANSAT-PICO-NAV}}
== Raspberry-Pi PICO ==
== Raspberry-Pi PICO ==
[[fichier:ENG-CANSAT-PICO-PINOUT-31.png]]
[[fichier:ENG-CANSAT-PICO-PINOUT-31.png]]
{{ambox-stop|text=Never exceed 3.3V, neither apply negative voltage, to any of the Pins}}
Digital Pins can be used as:
* '''Input''' - allowing the python script to read the state of the Pin. The pin '''is driven by external component''' or sensor setting.
** the read state returns HIGH when the pin is set to 3.3V.
** the read state returns LOW when the pin is tied to the GND (0 Volt).
* '''Output''' - allowing the python script to write the state of the Pin. The pin can produce (or absorb) some current '''to drive an external component''' or sensor.
** WHEN set to HIGH by Python code THEN the microcontroler drives the pin to 3.3V.
** WHEN set to LOW by Python code THEN the microcontroler drives the pin to GND (0 Volt).
{{underline|Please note:}}
* The analog input pins can also be used as digital input/output pins.
* The onboard LED is controlled by the pin GP25. The GP25 is not wired to a board pin.
=== Analog Pins ===
=== Analog Pins ===
[[fichier:ENG-CANSAT-PICO-PINOUT-32.png]]
[[fichier:ENG-CANSAT-PICO-PINOUT-32.png]]
* '''GP28''' - ADC2
The Pico does expose 3 analog inputs pins. Each pin can read a voltage between 0 and 3.3V.
* '''GP27''' - ADC1
* '''GP28''' - also known as ADC2 (analog input 2).
* '''GP26''' - ADC0
* '''GP27''' - also known as ADC1 (analog input 1).
* '''GP26''' - VSYS/3
* '''GP26''' - also known as ADC0 (analog input 0).
* '''AGND''' -
* '''GP26''' - not exposed on the board pin, the voltage applied to GP26 equal VSYS/3. It can be used to monitor the external power source/battery voltage.
* '''ADC_VREF''' - 3.3V filtered, do not applies any voltage to that pin.
* '''AGND''' - Reference ground for analog reading.
* '''ADC_VREF''' - Analog input voltage reference. It is the 3.3V with additional filtering. Do not applies any voltage to this pin, do not use it to supply power to the project.
The ADC (''Analog To Digital'' converter) does offers 12 bits resolution. So the ADC returns a numeric value from 0 to 4095 for an applied voltage going from 0 to 3.3V .
This means that ADC resolution is 3.3V / 4095 = 0.0008058607 (so 0.8 mV).
=== UARTs ===
=== UARTs ===
The Pico have many buses but one must be highlighted, it is '''UART(0)'''. UART is often referred as serial port.
'''UART(0)''' is the prefered position to replicates the MicroPython REPL (MicroPython interactive command line interpreter) but is free to use for scripts.
REPL stand for ''Read, Evaluate, Print Loop''.
REPL is available over:
* USB connector
* can be made available over UART(0) then just plug a [https://shop.mchobby.be/product.php?id_product=144 console cable] on RX & TX to get access to the REPL via the UART(0) .
[[fichier:ENG-CANSAT-PICO-PINOUT-33.png]]
=== Special Pins ===
=== Special Pins ===
* '''RUN''' - xxx. Act like '''Reset''' pin.
* '''RUN''' - This pin acts like '''Reset''' pin. Tie it to the ground and the the Pico immediately stops.
* '''3V3_EN''' - Already mentionned. Deactivate the 3.3V power regulator when tied to the ground.
* '''3V3_EN''' - Deactivate the 3.3V power regulator when tied to the ground. This will completely switch off the Pico power
* '''GP23''' - PowerSave internal board pin. Depending on the conditions, this pin can reduce the power consumption of the board.
* '''GP23''' - PowerSave internal board pin. Depending on the conditions, this pin can reduce the power consumption of the board.
* '''GP24''' - Already mentionned. This internal board pin is High when the board is connected to a computer or wall adapter (when VBus = 5V).
* '''GP24''' - This internal board pin is pulled HIGH when the board is connected to a computer or wall adapter (when VBus = 5V).
* '''GP25''' - Board LED
* '''GP25''' - Controls the onboard LED. The GP25 is not wired to a board pin.
=== Debug Pins ===
=== Debug Pins ===
The debugging port is an advanced feature used with OpenOCD. It allows software debugging on the MicroControler.
[[fichier:ENG-CANSAT-PICO-PINOUT-35.png]]
[[fichier:ENG-CANSAT-PICO-PINOUT-35.png]]
* '''SWCLK et SWDIO''' - those contact points, visible under the board, are used to program the microcontroler. You can also use thoses contact to connect the SWD debugger.
* '''SWCLK et SWDIO''' - Software Clock and Software IO. Used to connect the SWD debugger.
== Pico Ressource ==
== Pico Ressource ==
The [https://github.com/mchobby/pyboard-driver/tree/master/Pico Github of MCHobby contains useful PICO ressources] for designing schematic and board with the Pico.
The [https://github.com/mchobby/pyboard-driver/tree/master/Pico Github of MCHobby contains useful PICO ressources] for designing schematic and connexion between boards with the Pico.
The [https://github.com/mchobby/pyboard-driver/tree/master/Pico#pico-overlay Pico overlay] help to identifies Pins on the Pico.
The [https://github.com/mchobby/pyboard-driver/tree/master/Pico#pico-overlay Pico overlay] help to identifies Pins on the Pico.