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- /**
- * Copyright (C) 2023 saybur
- *
- * 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 <https://www.gnu.org/licenses/>.
- **/
- #pragma once
- #ifdef ENABLE_AUDIO_OUTPUT_SPDIF
- #include <stdint.h>
- // audio subsystem DMA channels
- #define SOUND_DMA_CHA 6
- #define SOUND_DMA_CHB 7
- // size of the two audio sample buffers, in bytes
- // these must be divisible by 1024
- // #define AUDIO_BUFFER_SIZE 8192 // ~46.44ms
- #define AUDIO_BUFFER_SIZE 4096 // reduce memory usage
- /**
- * Handler for DMA interrupts
- *
- * This is called from scsi_dma_irq() in scsi_accel_rp2040.cpp. That is
- * obviously a silly way to handle things. However, using
- * irq_add_shared_handler() causes a lockup, likely due to pico-sdk issue #724
- * fixed in 1.3.1. Current builds use pico-sdk 1.3.0 and are affected by
- * the bug. To work around the problem the above exclusive handler
- * delegates to this function if its normal mask is not matched.
- */
- void audio_dma_irq();
- /**
- * Indicates if the audio subsystem is actively streaming, including if it is
- * sending silent data during sample stall events.
- *
- * \return true if audio streaming is active, false otherwise.
- */
- bool audio_is_active();
- /**
- * Initializes the audio subsystem. Should be called only once, toward the end
- * of platform_late_init().
- */
- void audio_setup();
- /**
- * Called from platform_poll() to fill sample buffer(s) if needed.
- */
- void audio_poll();
- #endif // ENABLE_AUDIO_OUTPUT_SPDIF
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