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- /**
- * ZuluSCSI™ - Copyright (c) 2022-2025 Rabbit Hole Computing™
- *
- * ZuluSCSI™ firmware is licensed under the GPL version 3 or any later version.
- *
- * https://www.gnu.org/licenses/gpl-3.0.html
- * ----
- * 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/>.
- **/
- // SCSI subroutines that use hardware DMA for transfer in the background.
- // Uses either GD32 timer or external GreenPAK to implement REQ pin toggling.
- #pragma once
- #include <stdint.h>
- #include "ZuluSCSI_platform.h"
- #include "greenpak.h"
- #ifdef SCSI_TIMER
- #define SCSI_ACCEL_DMA_AVAILABLE 1
- #endif
- /* Initialization function decides whether to use timer or GreenPAK */
- void scsi_accel_greenpak_dma_init();
- void scsi_accel_timer_dma_init();
- /* Common functions */
- void scsi_accel_dma_startWrite(const uint8_t* data, uint32_t count, volatile int *resetFlag);
- void scsi_accel_dma_stopWrite();
- void scsi_accel_dma_finishWrite(volatile int *resetFlag);
- // Query whether the data at pointer has already been read, i.e. buffer can be reused.
- // If data is NULL, checks if all writes have completed.
- bool scsi_accel_dma_isWriteFinished(const uint8_t* data);
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