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://www.apache.org/licenses/LICENSE-2.0)
-
MIT license (LICENSE-MIT or http://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.