1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
#ifndef __DMA_H__
#define __DMA_H__
#ifdef __cplusplus
extern "C" {
#endif
//register a DMA transfer request
//ch: channel id request, there are 6 channles,
//irq_handler: the DMA interruption handle
//arg: argument to the handle
//mode: DMA mode, such as port width, address increased/fixed, and so on
//type: DMA request type
extern int dma_request(int ch, void (*irq_handler)(unsigned int), unsigned int arg,
unsigned int mode, unsigned int type);
//start DMA transfer, must request a DMA first
//ch: channel id
//srcAddr: DMA source address
//dstAddr: DMA destination address
//count: DMA transfer count, the total bytes due the mode in dma_request
extern void dma_start(int ch, unsigned int srcAddr, unsigned int dstAddr,
unsigned int count);
//Stop DMA transfer
extern void dma_stop(int ch);
//Wait DMA transfer over
extern int dma_wait_finish(int ch);
/*
* Copy 'size' bytes from src to dest, in blocks of 32 bytes.
* size is in bytes and must be a multiple of 32.
* Both src and dest must be aligned to 32 bytes.
* Returns 0 on failure, non-zero on success.
*/
extern int dma_copy32Byte(int ch, void *dest, void *src, unsigned int size);
// Blocks of 16 bytes, aligned to 16 bytes
extern int dma_copy16Byte(int ch, void *dest, void *src, unsigned int size);
// Blocks of 4 bytes, aligned to 4 bytes
extern int dma_copy32Bit(int ch, void *dest, void *src, unsigned int size);
// Blocks of 2 bytes, aligned to 2 bytes
extern int dma_copy16Bit(int ch, void *dest, void *src, unsigned int size);
extern int dma_isBusy(int ch);
extern int dma_isFree(int ch);
extern int dma_getFree(void);
#ifdef __cplusplus
}
#endif
#endif //__DMA_H__
|
