Send bit width to start PIO program on reset_buffer.

Author: relic-se

ports/raspberrypi/audio_dma.c

@@ -755,6 +755,7 @@ void __not_in_flash_func(isr_dma_1)(void) {
             audio_dma_t *dma = MP_STATE_PORT(recording_audio)[i];
             // Update last recorded buffer.
             dma->input_index = (uint8_t)(i != dma->input_channel[0]);
+            // Reset destination buffer for the dma channel.
             dma_channel_set_write_addr(i, dma->input_buffer[dma->input_index], false /* trigger */);
             dma_channel_set_trans_count(i, dma->input_buffer_length[dma->input_index] / dma->output_size, false /* trigger */);
         }

ports/raspberrypi/common-hal/audiobusio/I2SIn.c

@@ -268,6 +268,10 @@ void audiobusio_i2sin_reset_buffer(audiobusio_i2sin_obj_t *self,
 
     common_hal_rp2pio_statemachine_restart(&self->state_machine);
 
+    // Send bit width
+    const uint8_t bit_width_data[1] = { self->bits_per_sample };
+    common_hal_rp2pio_statemachine_write(&self->state_machine, bit_width_data, 1, 1, false);
+
     audio_dma_result result = audio_dma_setup_record(
         &self->dma,
         self,