1.. zephyr:board:: rp2040_zero
2
3Overview
4********
5
6RP2040-Zero, A Low-Cost, High-Performance Pico-Like MCU Board Based On Raspberry Pi Microcontroller RP2040.
7
8Hardware
9********
10- RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom.
11- Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz.
12- 264KB of SRAM, and 2MB of on-board Flash memory.
13- USB-C connector, keeps it up to date, easier to use.
14- The castellated module allows soldering direct to carrier boards.
15- USB 1.1 with device and host support.
16- Low-power sleep and dormant modes.
17- Drag-and-drop programming using mass storage over USB.
18- 29 × multi-function GPIO pins (20× via edge pinout, others via solder points).
19- 2 × SPI, 2 × I2C, 2 × UART, 4 × 12-bit ADC, 16 × controllable PWM channels.
20- Accurate clock and timer on-chip.
21- Temperature sensor.
22- Accelerated floating-point libraries on-chip.
23- 8 × Programmable I/O (PIO) state machines for custom peripheral support.
24
25Supported Features
26==================
27
28The ``rp2040_zero`` board target supports the following hardware features:
29
30.. list-table::
31   :header-rows: 1
32
33   * - Peripheral
34     - Kconfig option
35     - Devicetree compatible
36   * - NVIC
37     - N/A
38     - :dtcompatible:`arm,v6m-nvic`
39   * - UART
40     - :kconfig:option:`CONFIG_SERIAL`
41     - :dtcompatible:`raspberrypi,pico-uart`
42   * - GPIO
43     - :kconfig:option:`CONFIG_GPIO`
44     - :dtcompatible:`raspberrypi,pico-gpio`
45   * - ADC
46     - :kconfig:option:`CONFIG_ADC`
47     - :dtcompatible:`raspberrypi,pico-adc`
48   * - I2C
49     - :kconfig:option:`CONFIG_I2C`
50     - :dtcompatible:`snps,designware-i2c`
51   * - SPI
52     - :kconfig:option:`CONFIG_SPI`
53     - :dtcompatible:`raspberrypi,pico-spi`
54   * - USB Device
55     - :kconfig:option:`CONFIG_USB_DEVICE_STACK`
56     - :dtcompatible:`raspberrypi,pico-usbd`
57   * - HWINFO
58     - :kconfig:option:`CONFIG_HWINFO`
59     - N/A
60   * - Watchdog Timer (WDT)
61     - :kconfig:option:`CONFIG_WATCHDOG`
62     - :dtcompatible:`raspberrypi,pico-watchdog`
63   * - PWM
64     - :kconfig:option:`CONFIG_PWM`
65     - :dtcompatible:`raspberrypi,pico-pwm`
66   * - Flash
67     - :kconfig:option:`CONFIG_FLASH`
68     - :dtcompatible:`raspberrypi,pico-flash`
69   * - Clock controller
70     - :kconfig:option:`CONFIG_CLOCK_CONTROL`
71     - :dtcompatible:`raspberrypi,pico-clock-controller`
72   * - UART (PIO)
73     - :kconfig:option:`CONFIG_SERIAL`
74     - :dtcompatible:`raspberrypi,pico-uart-pio`
75   * - SPI (PIO)
76     - :kconfig:option:`CONFIG_SPI`
77     - :dtcompatible:`raspberrypi,pico-spi-pio`
78
79Pin Mapping
80===========
81
82The peripherals of the RP2040 SoC can be routed to various pins on the board. The configuration of these routes can be modified through DTS. Please refer to the datasheet to see the possible routings for each peripheral.
83
84Default Zephyr Peripheral Mapping:
85----------------------------------
86
87.. rst-class:: rst-columns
88
89- UART0_TX : P0
90- UART0_RX : P1
91- I2C0_SDA : P4
92- I2C0_SCL : P5
93- I2C1_SDA : P6
94- I2C1_SCL : P7
95- ADC_CH0 : P26
96- ADC_CH1 : P27
97- ADC_CH2 : P28
98- ADC_CH3 : P29
99
100Programming and Debugging
101*************************
102
103Flashing
104========
105
106Using UF2
107---------
108
109Here is an example of building the sample for driving the built-in RGB led.
110
111.. zephyr-app-commands::
112   :zephyr-app: samples/drivers/led/led_strip
113   :board: rp2040_zero
114   :goals: build
115   :compact:
116
117You must flash the RP2040-Zero with an UF2 file. One option is to use West (Zephyr’s meta-tool). To enter the UF2 flashing mode just keep the ``BOOT`` button pressed while you connect the USB port, it will appear on the host as a mass storage device. In alternative with the board already connected via USB you can keep the ``RESET`` button pressed, press and release ``BOOT``, release ``RESET``. At this point you can flash the image file by running:
118
119.. code-block:: bash
120
121  west flash
122
123In alternative you can locate the generated file at ``build/zephyr/zephyr.uf2 file`` and simply drag-and-drop to the device after entreing the UF2 flashing mode.
124
125References
126**********
127
128- `Official Documentation`_
129- `WS2812 datasheet`_
130
131.. _Official Documentation: https://www.waveshare.com/wiki/RP2040-Zero
132.. _WS2812 datasheet: https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
133