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
55
56
57
58
59
60
61
62
63
64
65
|
/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
/*
* ao_spi.c
*/
extern __xdata uint8_t ao_spi_mutex;
#define ao_spi_get_mask(reg,mask,bus) do { \
ao_mutex_get(&ao_spi_mutex); \
(reg) &= ~(mask); \
} while (0)
#define ao_spi_put_mask(reg,mask,bus) do { \
(reg) |= (mask); \
ao_mutex_put(&ao_spi_mutex); \
} while (0)
#define ao_spi_get_bit(bit) do { \
ao_mutex_get(&ao_spi_mutex); \
(bit) = 0; \
} while (0)
#define ao_spi_put_bit(bit) do { \
(bit) = 1; \
ao_mutex_put(&ao_spi_mutex); \
} while (0)
/*
* The SPI mutex must be held to call either of these
* functions -- this mutex covers the entire SPI operation,
* from chip select low to chip select high
*/
void
ao_spi_send_bus(void __xdata *block, uint16_t len) __reentrant;
void
ao_spi_recv_bus(void __xdata *block, uint16_t len) __reentrant;
#define ao_spi_send(block, len, bus) ao_spi_send_bus(block, len)
#define ao_spi_recv(block, len, bus) ao_spi_recv_bus(block, len)
void
ao_spi_init(void);
#define ao_spi_init_cs(port, mask) do { \
SPI_CS_PORT |= (mask); \
SPI_CS_DIR |= (mask); \
} while (0)
|
