See Getting Started with the Raspberry Pi Pico and the README in the pico-sdk for information
on getting up and running.
App |
Description |
hello_adc |
Display the voltage from an ADC input. |
joystick_display |
Display a Joystick X/Y input based on two ADC inputs. |
adc_console |
An interactive shell for playing with the ADC. Includes example of free-running capture mode. |
microphone_adc |
Read analog values from a microphone and plot the measured sound amplitude. |
App |
Description |
hello_48MHz |
Change the system clock frequency to 48 MHz while running. |
hello_gpout |
Use the general purpose clock outputs (GPOUT) to drive divisions of internal clocks onto GPIO outputs. |
hello_resus |
Enable the clock resuscitate feature, "accidentally" stop the system clock, and show how we recover. |
App |
Description |
build_variants |
Builds two version of the same app with different configurations |
App |
Description |
hello_dma |
Use the DMA to copy data in memory. |
control_blocks |
Build a control block list, to program a longer sequence of DMA transfers to the UART. |
channel_irq |
Use an IRQ handler to reconfigure a DMA channel, in order to continuously drive data through a PIO state machine. |
App |
Description |
cache_perfctr |
Read and clear the cache performance counters. Show how they are affected by different types of flash reads. |
nuke |
Obliterate the contents of flash. An example of a NO_FLASH binary (UF2 loaded directly into SRAM and runs in-place there). A useful utility to drag and drop onto your Pico if the need arises. |
program |
Erase a flash sector, program one flash page, and read back the data. |
xip_stream |
Stream data using the XIP stream hardware, which allows data to be DMA'd in the background whilst executing code from flash. |
ssi_dma |
DMA directly from the flash interface (continuous SCK clocking) for maximum bulk read performance. |
App |
Description |
hello_7segment |
Use the GPIOs to drive a seven segment LED display. |
hello_gpio_irq |
Register an interrupt handler to run when a GPIO is toggled. |
dht_sensor |
Use GPIO to bitbang the serial protocol for a DHT temperature/humidity sensor. |
See also: blink, blinking an LED attached to a GPIO.
App |
Description |
hello_divider |
Show how to directly access the hardware integer dividers, in case AEABI injection is disabled. |
App |
Description |
bus_scan |
Scan the I2C bus for devices and display results. |
bmp280_i2c |
Read and convert temperature and pressure data from a BMP280 sensor, attached to an I2C bus. |
lcd_1602_i2c |
Display some text on a generic 16x2 character LCD display, via I2C. |
lis3dh_i2c |
Read acceleration and temperature value from a LIS3DH sensor via I2C |
mcp9808_i2c |
Read temperature, set limits and raise alerts when limits are surpassed. |
mma8451_i2c |
Read acceleration from a MMA8451 accelerometer and set range and precision for the data. |
mpl3115a2_i2c |
Interface with an MPL3115A2 altimeter, exploring interrupts and advanced board features, via I2C. |
mpu6050_i2c |
Read acceleration and angular rate values from a MPU6050 accelerometer/gyro, attached to an I2C bus. |
oled_i2c |
Convert and display a bitmap on a 128x32 SSD1306-driven OLED display |
pa1010d_i2c |
Read GPS location data, parse and display data via I2C. |
pcf8523_i2c |
Read time and date values from a real time clock. Set current time and alarms on it. |
App |
Description |
hello_interp |
A bundle of small examples, showing how to access the core-local interpolator hardware, and use most of its features. |
App |
Description |
hello_multicore |
Launch a function on the second core, printf some messages on each core, and pass data back and forth through the mailbox FIFOs. |
multicore_fifo_irqs |
On each core, register and interrupt handler for the mailbox FIFOs. Show how the interrupt fires when that core receives a message. |
multicore_runner |
Set up the second core to accept, and run, any function pointer pushed into its mailbox FIFO. Push in a few pieces of code and get answers back. |
App |
Description |
blinky |
Blink "hello, world" in Morse code on Pico's LED |
button |
Use Pico's BOOTSEL button as a regular button input, by temporarily suspending flash access. |
App |
Description |
hello_pio |
Absolutely minimal example showing how to control an LED by pushing values into a PIO FIFO. |
apa102 |
Rainbow pattern on on a string of APA102 addressable RGB LEDs. |
differential_manchester |
Send and receive differential Manchester-encoded serial (BMC). |
hub75 |
Display an image on a 128x64 HUB75 RGB LED matrix. |
i2c |
Scan an I2C bus. |
ir_nec |
Sending and receiving IR (infra-red) codes using the PIO. |
logic_analyser |
Use PIO and DMA to capture a logic trace of some GPIOs, whilst a PWM unit is driving them. |
manchester_encoding |
Send and receive Manchester-encoded serial. |
pio_blink |
Set up some PIO state machines to blink LEDs at different frequencies, according to delay counts pushed into their FIFOs. |
pwm |
Pulse width modulation on PIO. Use it to gradually fade the brightness of an LED. |
spi |
Use PIO to erase, program and read an external SPI flash chip. A second example runs a loopback test with all four CPHA/CPOL combinations. |
squarewave |
Drive a fast square wave onto a GPIO. This example accesses low-level PIO registers directly, instead of using the SDK functions. |
st7789_lcd |
Set up PIO for 62.5 Mbps serial output, and use this to display a spinning image on a ST7789 serial LCD. |
quadrature_encoder |
A quadrature encoder using PIO to maintain counts independent of the CPU. |
uart_rx |
Implement the receive component of a UART serial port. Attach it to the spare Arm UART to see it receive characters. |
uart_tx |
Implement the transmit component of a UART serial port, and print hello world. |
ws2812 |
Examples of driving WS2812 addressable RGB LEDs. |
addition |
Add two integers together using PIO. Only around 8 billion times slower than Cortex-M0+. |
App |
Description |
hello_pwm |
Minimal example of driving PWM output on GPIOs. |
led_fade |
Fade an LED between low and high brightness. An interrupt handler updates the PWM slice's output level each time the counter wraps. |
measure_duty_cycle |
Drives a PWM output at a range of duty cycles, and uses another PWM slice in input mode to measure the duty cycle. |
App |
Description |
hello_reset |
Perform a hard reset on some peripherals, then bring them back up. |
App |
Description |
hello_rtc |
Set a date/time on the RTC, then repeatedly print the current time, 10 times per second, to show it updating. |
rtc_alarm |
Set an alarm on the RTC to trigger an interrupt at a date/time 5 seconds into the future. |
rtc_alarm_repeat |
Trigger an RTC interrupt once per minute. |
App |
Description |
bme280_spi |
Attach a BME280 temperature/humidity/pressure sensor via SPI. |
mpu9250_spi |
Attach a MPU9250 accelerometer/gyoscope via SPI. |
spi_dma |
Use DMA to transfer data both to and from the SPI simultaneously. The SPI is configured for loopback. |
spi_flash |
Erase, program and read a serial flash device attached to one of the SPI controllers. |
App |
Description |
hello_double_tap |
An LED blink with the pico_bootsel_via_double_reset library linked. This enters the USB bootloader when it detects the system being reset twice in quick succession, which is useful for boards with a reset button but no BOOTSEL button. |
narrow_io_write |
Demonstrate the effects of 8-bit and 16-bit writes on a 32-bit IO register. |
unique_board_id |
Read the 64 bit unique ID from external flash, which serves as a unique identifier for the board. |
App |
Description |
hello_timer |
Set callbacks on the system timer, which repeat at regular intervals. Cancel the timer when we're done. |
periodic_sampler |
Sample GPIOs in a timer callback, and push the samples into a concurrency-safe queue. Pop data from the queue in code running in the foreground. |
timer_lowlevel |
Example of direct access to the timer hardware. Not generally recommended, as the SDK may use the timer for IO timeouts. |
App |
Description |
hello_uart |
Print some text from one of the UART serial ports, without going through stdio . |
lcd_uart |
Display text and symbols on a 16x02 RGB LCD display via UART |
uart_advanced |
Use some other UART features like RX interrupts, hardware control flow, and data formats other than 8n1. |
Most of the USB device examples come directly from the TinyUSB device examples directory here.
Those that are supported on RP2040 devices are automatically included as part of the pico-examples
build as targets named tinyusb_dev_<example_name>
, e.g. https://github.com/hathach/tinyusb/tree/master/examples/device/hid_composite
is built as tinyusb_dev_hid_composite
.
At the time of writing, these examples are available:
- tinyusb_dev_audio_4_channel_mic
- tinyusb_dev_audio_test
- tinyusb_dev_board_test
- tinyusb_dev_cdc_dual_ports
- tinyusb_dev_cdc_msc
- tinyusb_dev_dfu
- tinyusb_dev_dfu_runtime
- tinyusb_dev_dynamic_configuration
- tinyusb_dev_hid_composite
- tinyusb_dev_hid_generic_inout
- tinyusb_dev_hid_multiple_interface
- tinyusb_dev_midi_test
- tinyusb_dev_msc_dual_lun
- tinyusb_dev_net_lwip_webserver
- tinyusb_dev_uac2_headset
- tinyusb_dev_usbtmc
- tinyusb_dev_video_capture
- tinyusb_dev_webusb_serial
Whilst these examples ably demonstrate how to use TinyUSB in device mode, their CMakeLists.txt
is set up in a way
tailored to how TinyUSB builds their examples within their source tree.
For a better example of how to configure CMakeLists.txt
for using TinyUSB in device mode with the Raspberry Pi SDK
see below:
App |
Description |
dev_hid_composite |
A copy of the TinyUSB device example with the same name, but with a CMakeLists.txt which demonstrates how to add a dependency on the TinyUSB device libraries with the Raspberry Pi Pico SDK |
App |
Description |
dev_lowlevel |
A USB Bulk loopback implemented with direct access to the USB hardware (no TinyUSB) |
All the USB host examples come directly from the TinyUSB host examples directory here.
Those that are supported on RP2040 devices are automatically included as part of the pico-examples
build as targets named tinyusb_host_<example_name>
, e.g. https://github.com/hathach/tinyusb/tree/master/examples/host/cdc_msc_hid
is built as tinyusb_host_cdc_msc_hid
.
At the time of writing, there is only one host example available:
App |
Description |
hello_watchdog |
Set the watchdog timer, and let it expire. Detect the reboot, and halt. |