Raspberry PICO

Introduction

Raspberry Pi Pico is a low-cost, high-performance microcontroller board with flexible digital interfaces.

Key features include:

RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom
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 with device and host support
Low-power sleep and dormant modes
Drag-and-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 I/O (PIO) state machines for custom peripheral support

Supported compiler

Support GCC 6 and above compilers. CMake and Scons is needed.

Program firmware

Step 1: download pico sdk

pkgs --update

Step 2: generate necessary files

python ./tools/generate_files.py

Use PICO_TOOLCHAIN_PATH to specify the compilation toolchain location, for example:

env PICO_TOOLCHAIN_PATH=/opt/rt-gcc-arm-none-eabi/bin ./tools/generate_files.py
``

### Step 3: build

bash scons -c scons


**gcc version >= 6.x.x**

### Step 4: flash

scons generates a UF2 file:

![elf2uf2](figures/elf2uf2.png)

- Copy the rtthread-pico.uf2 file to the "RPI-RP2" disk
- Then led blink.

Or you can use the picotool by:

bash picotool load rtthread-pico.uf2 picotool reboot


## Running Result

The output information on serial port should be like this:

bash \ | /

RT - Thread Operating System / | \ 4.0.3 build Jan 28 2021 2006 - 2021 Copyright by rt-thread team Hello, RT-Thread! msh > ``` ## Peripheral Condition | Drive | Support | Remark | | ----- | ------- | ------- | | UART | Support | UART0/1 | | GPIO | Support | 0-29 | | I2C | - | - | | RTC | - | - | | SDIO | - | - | | SPI | - | - | | TIMER | - | - | | WDT | - | - |

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