; Copyright 2022 Colin Lam, Ploopy Corporation
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program.  If not, see <http://www.gnu.org/licenses/>.


.program i2s_read
.side_set 2

set x, 30                   side 0b00

left_channel:
    in pins, 1              side 0b11
    jmp x-- left_channel    side 0b10
    in pins, 1              side 0b11

set x, 30                   side 0b10

right_channel:
    in pins, 1              side 0b01
    jmp x--, right_channel  side 0b00
    in pins, 1              side 0b01


.program i2s_write
.side_set 2

set x, 30                   side 0b01

left_channel:
    out pins, 1             side 0b10
    jmp x-- left_channel    side 0b11
    out pins, 1             side 0b10

set x, 30                   side 0b11

right_channel:
    out pins, 1             side 0b00
    jmp x--, right_channel  side 0b01
    out pins, 1             side 0b00