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dma_api.h
1 
2 /** \addtogroup hal */
3 /** @{*/
4 /* mbed Microcontroller Library
5  * Copyright (c) 2014-2015 ARM Limited
6  * SPDX-License-Identifier: Apache-2.0
7  *
8  * Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 #ifndef MBED_DMA_API_H
21 #define MBED_DMA_API_H
22 
23 #include <stdint.h>
24 
25 #define DMA_ERROR_OUT_OF_CHANNELS (-1)
26 
27 typedef enum {
28  DMA_USAGE_NEVER,
29  DMA_USAGE_OPPORTUNISTIC,
30  DMA_USAGE_ALWAYS,
31  DMA_USAGE_TEMPORARY_ALLOCATED,
32  DMA_USAGE_ALLOCATED
33 } DMAUsage;
34 
35 #ifdef __cplusplus
36 extern "C" {
37 #endif
38 
39 void dma_init(void);
40 
41 int dma_channel_allocate(uint32_t capabilities);
42 
43 int dma_channel_free(int channelid);
44 
45 #ifdef __cplusplus
46 }
47 #endif
48 
49 #endif
50 
51 /** @}*/
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