=============================== Raspberry Pi Pico =============================== The `Raspberry Pi Pico `_ is a general purpose board supplied by the Raspberry Pi Foundation. .. figure:: RaspberryPiPico.png :align: center Features ======== * RP2040 microcontroller chip * Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz * 264kB of SRAM, and 2MB of on-board Flash memory * Castellated module allows soldering direct to carrier boards * USB 1.1 Host and Device support * Low-power sleep and dormant modes * Drag & drop programming using mass storage over USB * 26 multi-function GPIO pins * 2× SPI, 2× I2C, 2× UART, 3× 12-bit ADC, 16× controllable PWM channels * Accurate clock and timer on-chip * Temperature sensor * Accelerated floating point libraries on-chip * 8 × Programmable IO (PIO) state machines for custom peripheral support Serial Console ============== By default a serial console appears on pins 1 (TX GPIO0) and pin 2 (RX GPIO1). This console runs a 115200-8N1. The board can be configured to use the USB connection as the serial console. Buttons and LEDs ================ User LED controlled by GPIO25. A BOOTSEL button, which if held down when power is first applied to the board, will cause the RP2040 to boot into programming mode and appear as a storage device to a computer connected via USB . Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040. Pin Mapping =========== Pads numbered anticlockwise from USB connector. ===== ========== ========== Pad Signal Notes ===== ========== ========== 1 GPIO0 Default TX for UART0 serial console 2 GPIO1 Default RX for UART1 serial console 3 Ground 4 GPIO2 5 GPIO3 6 GPIO4 7 GPIO5 8 Ground 9 GPIO6 10 GPIO7 11 GPIO8 12 GPIO9 13 Ground 14 GPIO10 15 GPIO11 16 GPIO12 17 GPIO13 18 Ground 19 GPIO14 20 GPIO15 21 GPIO16 22 GPIO17 23 Ground 24 GPIO18 25 GPIO19 26 GPIO20 27 GPIO21 28 Ground 29 GPIO22 30 Run 31 GPIO26 ADC0 32 GPIO27 ADC1 33 AGND Analog Ground 34 GPIO28 ADC2 35 ADC_VREF 36 3V3 Power output to peripherals 37 3V3_EN Pull to ground to turn off. 38 Ground 39 VSYS +5V Supply to board 40 VBUS Connected to USB +5V ===== ========== ========== Other RP2040 Pins ================= GPIO23 Output - Power supply control. GPIO24 Input - High if USB port or Pad 40 supplying power. GPIO25 Output - On board LED. ADC3 Input - Analog voltage equal to one third of VSys voltage. Separate pins for the Serial Debug Port (SDB) are available Power Supply ============ The Raspberry Pi Pico can be powered via the USB connector, or by supplying +5V to pin 39. The board had a diode that prevents power from pin 39 from flowing back to the USB socket, although the socket can be power via pin 30. The Raspberry Pi Pico chip run on 3.3 volts. This is supplied by an onboard voltage regulator. This regulator can be disabled by pulling pin 37 to ground. The regulator can run in two modes. By default the regulator runs in PFM mode which provides the best efficiency, but may be switched to PWM mode for improved ripple by outputting a one on GPIO23. Configurations ============== audiopack --------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NSPlayer audio player. composite --------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for CDC/ACM with MSC USB composite driver. displaypack ----------- NuttShell configuration (console enabled in USB Port, at 115200 bps) supporting ST7789 video display. enc28j60 -------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NC28J60. lcd1602 ------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for LCD1602. nsh --- Basic NuttShell configuration (console enabled in UART0, at 115200 bps). nshsram ------- NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt vectors in RAM. smp --- Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with both ARM cores enabled. spisd ----- NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI configured. ssd1306 ------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for ssd1306. st7735 ------ NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7735. usbmsc ------ NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc. usbnsh ------ Basic NuttShell configuration (console enabled in USB Port, at 115200 bps). waveshare-lcd-1.14 ------------------ NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7789. waveshare-lcd-1.3 ----------------- NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc.