pio 0.4.0

Support for the Raspberry Silicon RP2040's PIO State Machines.
Documentation 
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.DEFINE PUBLIC me_a_symbol 2

.program case_reference
public label:
    jmp label
    jmp label
    mov pins, isr
    mov osr, x
.wrap_target
    wait 1 gpio 1 
    nop
    wait 1 pin 1
    wait 1 irq 1
    in null, 1
    out pc, 1
    push block
    push iffull
    pull ifempty
    pull noblock
    mov exec, status
    irq wait 3
    irq nowait 2
    irq clear 1
    irq set 1
.wrap
    set pindirs, 0
    jmp !x label
    jmp !osre label

.program variable_case
PUBLIC label:
    JMp label
    JMP label
    MOV PINS, ISR
    MOV OSR, X
.WRAP_TARGET
    WAIT 1 GPIO 1 
    NOP
    WAIT 1 PIN 1
    WAIT 1 IRQ 1
    IN NULL, 1
    OUT PC, 1
    PUSH BLOCK
    PUSH IfFull
    PULL IfEmpty
    PULL NOBLOCK
    MOV EXEC, STATUS
    IRQ WAIT 3
    IRQ NOWAIT 2
    IRQ CLEAR 1
    IRQ SET 1
.WRAP
    SET PINDIRS, 0
    JMP !X label
    JMP !OSRE label

.program variable_case_side_ref
.origin 5
.side_set 1
    out pins 1 side 0

.PROGRAM variable_case_side
.ORIGIN 5
.SIDE_SET 1
    out pins 1 SIDE 0