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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Michael Hope.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*****************************************************************************/
/**
* @file dma.h
*
* @brief Direct Memory Access peripheral support
*/
#ifndef _DMA_H_
#define _DMA_H_
#ifdef __cplusplus
extern "C"{
#endif
/** Base address of the DMA1 peripheral */
#define DMA1_BASE 0x40020000
/** DMA Interrupt Status Register */
#define DMA1_ISR (DMA1_BASE + 0x00)
/** DMA Interrput Flag Clear Register */
#define DMA1_IFCR (DMA1_BASE + 0x04)
/** DMA Channel Configuration Register */
#define DMA1_CCR1 (DMA1_BASE + 0x08)
/** DMA Channel Number of Data Register */
#define DMA1_CNDTR1 (DMA1_BASE + 0x0C)
/** DMA Channel Peripheral Address Register */
#define DMA1_CPAR1 (DMA1_BASE + 0x10)
/** DMA Channel Memory Address Register */
#define DMA1_CMAR1 (DMA1_BASE + 0x14)
/** Spacing between channel registers */
#define DMA_CHANNEL_STRIDE 20
typedef enum dma_mode_flags {
/** Auto-increment memory address */
DMA_MINC_MODE = 4,
/** Auto-increment peripheral address */
DMA_PINC_MODE = 2,
/** Circular mode */
DMA_CIRC_MODE = 1,
} dma_mode_flags;
void dma_init(uint8 channel, volatile void *peripheral, bool from_peripheral, dma_mode_flags mode);
void dma_start(uint8 channel, volatile void *buffer, uint16 count);
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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