set up pio audio parameters

ports/raspberrypi/bindings/rp2pio/StateMachine.c

@@ -506,7 +506,7 @@ MP_DEFINE_CONST_FUN_OBJ_KW(rp2pio_statemachine_write_obj, 2, rp2pio_statemachine
 //|         Then the ``once`` and/or ``loop`` buffers are queued. and the function returns.
 //|         The ``once`` buffer (if specified) will be written just once.
 //|         Finally, the ``loop`` and/or ``loop2`` buffer (if specified) will continue being looped indefinitely.  If both ``loop`` and ``loop2`` are specified, they will alternate.
-//|         
+//|
 //|         Writes to the FIFO will match the input buffer's element size. For example, bytearray elements
 //|         will perform 8 bit writes to the PIO FIFO. The RP2040's memory bus will duplicate the value into
 //|         the other byte positions. So, pulling more data in the PIO assembly will read the duplicated values.
@@ -1181,6 +1181,8 @@ static const mp_rom_map_elem_t rp2pio_statemachine_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_last_read), MP_ROM_PTR(&rp2pio_statemachine_last_read_obj) },
     { MP_ROM_QSTR(MP_QSTR_last_write), MP_ROM_PTR(&rp2pio_statemachine_last_write_obj) },
 
+    { MP_ROM_QSTR(MP_QSTR_write_audio), MP_ROM_PTR(&rp2pio_statemachine_write_audio_obj) },
+    { MP_ROM_QSTR(MP_QSTR_read_audio), MP_ROM_PTR(&rp2pio_statemachine_read_audio_obj) },
 };
 static MP_DEFINE_CONST_DICT(rp2pio_statemachine_locals_dict, rp2pio_statemachine_locals_dict_table);
 

ports/raspberrypi/bindings/rp2pio/StateMachine.h

@@ -75,6 +75,12 @@ bool common_hal_rp2pio_statemachine_write_readinto(rp2pio_statemachine_obj_t *se
 uint32_t common_hal_rp2pio_statemachine_get_frequency(rp2pio_statemachine_obj_t *self);
 void common_hal_rp2pio_statemachine_set_frequency(rp2pio_statemachine_obj_t *self, uint32_t frequency);
 
+mp_obj_t common_hal_rp2pio_statemachine_get_write_audio(rp2pio_statemachine_obj_t *self);
+void common_hal_rp2pio_statemachine_set_write_audio(rp2pio_statemachine_obj_t *self, mp_obj_t write_audio);
+
+mp_obj_t common_hal_rp2pio_statemachine_get_read_audio(rp2pio_statemachine_obj_t *self);
+void common_hal_rp2pio_statemachine_set_read_audio(rp2pio_statemachine_obj_t *self, mp_obj_t read_audio);
+
 bool common_hal_rp2pio_statemachine_get_rxstall(rp2pio_statemachine_obj_t *self);
 void common_hal_rp2pio_statemachine_clear_rxfifo(rp2pio_statemachine_obj_t *self);
 

ports/raspberrypi/common-hal/rp2pio/StateMachine.c

@@ -449,6 +449,9 @@ bool rp2pio_statemachine_construct(rp2pio_statemachine_obj_t *self,
 
     sm_config_set_fifo_join(&c, join);
 
+    self->read_audio = mp_const_none;
+    self->write_audio = mp_const_none;
+
     // TODO: these arguments
     // int mov_status_type, int mov_status_n,
     // int set_count, int out_count
@@ -754,6 +757,22 @@ void common_hal_rp2pio_statemachine_set_frequency(rp2pio_statemachine_obj_t *sel
     pio_sm_clkdiv_restart(self->pio, self->state_machine);
 }
 
+mp_obj_t common_hal_rp2pio_statemachine_get_write_audio(rp2pio_statemachine_obj_t *self) {
+    return self->write_audio;
+}
+
+void common_hal_rp2pio_statemachine_set_write_audio(rp2pio_statemachine_obj_t *self, mp_obj_t write_audio) {
+    self->write_audio = write_audio;
+}
+
+mp_obj_t common_hal_rp2pio_statemachine_get_read_audio(rp2pio_statemachine_obj_t *self) {
+    return self->read_audio;
+}
+
+void common_hal_rp2pio_statemachine_set_read_audio(rp2pio_statemachine_obj_t *self, mp_obj_t read_audio) {
+    self->read_audio = read_audio;
+}
+
 void rp2pio_statemachine_reset_ok(PIO pio, int sm) {
     uint8_t pio_index = pio_get_index(pio);
     _never_reset[pio_index][sm] = false;

ports/raspberrypi/common-hal/rp2pio/StateMachine.h

@@ -60,6 +60,8 @@ typedef struct {
     sm_buf_info once_write_buf_info, loop_write_buf_info, loop2_write_buf_info;
     sm_buf_info current_write_buf, next_write_buf_1, next_write_buf_2, next_write_buf_3;
 
+    mp_obj_t write_audio, read_audio;
+
     bool switched_write_buffers, switched_read_buffers;
 
     int background_stride_in_bytes;