.program wizchip_pio_spi_quad_write_read
.side_set 1

write_bits:
    out pins, 4             side 0
    jmp x-- write_bits      side 1
    set pins 0              side 0
public write_bits_end:
read_byte_delay:
    set pindirs 0           side 0
read_byte:
    set x 0                 side 1
read_bits:
    in pins, 4              side 0
    jmp x-- read_bits       side 1
    in pins, 4              side 0
    jmp y-- read_byte       side 0
public read_bits_end: