Crate pio

Programmable Input/Output

// Repeatedly get one word of data from the TX FIFO, stalling when
// the FIFO is empty. Write the least significant bit to the OUT pin
// group.
// https://github.com/raspberrypi/pico-examples/tree/master/pio/hello_pio/hello.pio
let mut a = pio::Assembler::<{ pio::RP2040_MAX_PROGRAM_SIZE }>::new();

let mut loop_label = a.label();

a.bind(&mut loop_label);
a.pull(false, false);
a.out(pio::OutDestination::PINS, 1);
a.jmp(pio::JmpCondition::Always, &mut loop_label);

let program = a.assemble_program();

Wrapping

let mut a = pio::Assembler::<{ pio::RP2040_MAX_PROGRAM_SIZE }>::new();

let mut wrap_source = a.label();
let mut wrap_target = a.label();

// Initialize pin direction only once
a.set(pio::SetDestination::PINDIRS, 1);
a.bind(&mut wrap_target);
a.out(pio::OutDestination::PINS, 1);
a.bind(&mut wrap_source);

let program = a.assemble_with_wrap(wrap_source, wrap_target);

Structs

ArrayVec

A vector with a fixed capacity.

Assembler

A PIO Assembler. See chapter three of the RP2040 Datasheet.

Instruction

A PIO instruction.

Label

A label.

Program

Program ready to be executed by PIO hardware.

ProgramWithDefines

Parsed program with defines.

SideSet

Data for ‘side’ set instruction parameters.

Wrap

Source and target for automatic program wrapping.

Enums

InSource

InstructionOperands

JmpCondition

MovDestination

MovOperation

MovSource

OutDestination

SetDestination

WaitSource

Constants

RP2040_MAX_PROGRAM_SIZE

Maximum program size of RP2040 chip, in bytes.