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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/************************************************************************************
* configs/sam3u-ek/src/up_spi.c
* arch/arm/src/board/up_spi.c
*
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <debug.h>
#include <nuttx/spi.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "sam3u_internal.h"
#include "sam3uek_internal.h"
#ifdef CONFIG_SAM3U_SPI
/************************************************************************************
* Definitions
************************************************************************************/
/* Enables debug output from this file (needs CONFIG_DEBUG too) */
#undef SPI_DEBUG /* Define to enable debug */
#undef SPI_VERBOSE /* Define to enable verbose debug */
#ifdef SPI_DEBUG
# define spidbg lldbg
# ifdef SPI_VERBOSE
# define spivdbg lldbg
# else
# define spivdbg(x...)
# endif
#else
# undef SPI_VERBOSE
# define spidbg(x...)
# define spivdbg(x...)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: sam3u_spiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the SAM3U10E-EVAL board.
*
************************************************************************************/
void weak_function sam3u_spiinitialize(void)
{
/* The ZigBee module connects used NPCS0. However, there is not yet any
* ZigBee support.
*/
/* The touchscreen connects using NPCS2 (PC14). */
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
sam3u_configgpio(GPIO_TSC_NPCS2);
#endif
}
/****************************************************************************
* Name: sam3u_spiselect, sam3u_spistatus, and sam3u_spicmddata
*
* Description:
* These external functions must be provided by board-specific logic. They
* are implementations of the select, status, and cmddata methods of the SPI
* interface defined by struct spi_ops_s (see include/nuttx/spi.h). All
* other methods including up_spiinitialize()) are provided by common SAM3U
* logic. To use this common SPI logic on your board:
*
* 1. Provide logic in sam3u_boardinitialize() to configure SPI chip select
* pins.
* 2. Provide sam3u_spiselect() and sam3u_spistatus() functions in your
* board-specific logic. These functions will perform chip selection
* and status operations using GPIOs in the way your board is configured.
* 2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
* sam3u_spicmddata() functions in your board-specific logic. This
* function will perform cmd/data selection operations using GPIOs in
* the way your board is configured.
* 3. Add a call to up_spiinitialize() in your low level application
* initialization logic
* 4. The handle returned by up_spiinitialize() may then be used to bind the
* SPI driver to higher level logic (e.g., calling
* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
* the SPI MMC/SD driver).
*
****************************************************************************/
#ifdef CONFIG_SAM3U_SPI
int sam3u_spiselect(enum spi_dev_e devid)
{
int cs = -EINVAL;
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
if (devid == SPIDEV_TOUCHSCREEN)
{
/* Assert the CS pin to the OLED display */
cs = 2;
}
#endif
spidbg("devid: %d CS: %d\n", (int)devid, cs);
return cs;
}
uint8_t sam3u_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
return 0;
}
#endif
#endif /* CONFIG_SAM3U_SPI */
|
