This crates uses one of the PIOs and the DMA engine to implement a simple logic analyzer. The state of the GPIO pins is continously monitored. Every change is logged with a timestamp into a memory buffer.

A helper function is provided to print the memory buffer in VCD format to a Write instance.

cargo embed --example=ws2812

cargo embed is configured to write log files, so after exiting(!), ws2812_RP2040_<timestamp>_channel1.txt contains a VCD dump which can be visualized using Pulseview:

Wrap the code segment to monitor:

    use rp2040_pio_logic_analyzer as probe;

    let mut dma_buf = [0u32; 8192];
    probe::run_with_logic_analyzer(pac.PIO1, pac.DMA, &mut pac.RESETS, &mut dma_buf, || {
       // some code which uses GPIO pins
    });
    probe::write_dma_buffer(&mut write, &dma_buf[..]);

This library was inspired by Buck50, an stm32 based logic analyzer.

This project is licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http:https://www.apache.org/licenses/LICENSE-2.0)

• MIT license (LICENSE-MIT or http:https://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.