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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/************************************************************************************
* configs/sure-pic32mx/src/up_spi.c
* arch/arm/src/board/up_spi.c
*
* Copyright (C) 2011-2012 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 "pic32mx-internal.h"
#include "sure-internal.h"
#if defined(CONFIG_PIC32MX_SPI2)
/************************************************************************************
* Definitions
************************************************************************************/
/* The Sure PIC32MX has an SD slot connected on SPI2:
*
* SPI
* SCK2/PMA5/CN8/RG6 SCK SD connector SCK, FLASH (U1) SCK*
* SDI2/PMA4/CN9/RG7 SDI SD connector DO, FLASH (U1) SO*
* SDO2/PMA3/CN10/RG8 SDO SD connector DI, FLASH (U1) SI*
*
* Chip Select. Pulled up on-board
* TDO/AN11/PMA12/RB11 SD_CS SD connector CS
*
* Status inputs. All pulled up on-board
*
* TCK/AN12/PMA11/RB12 SD_CD SD connector CD
* TDI/AN13/PMA10/RB13 SD_WD SD connector WD
*/
#define GPIO_SD_CS (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTB|GPIO_PIN11)
#define GPIO_SD_CD (GPIO_INPUT|GPIO_INT|GPIO_PORTB|GPIO_PIN12)
#define GPIO_SD_WD (GPIO_INPUT|GPIO_PORTB|GPIO_PIN13)
/* Change notification numbers -- Not available for SD_CD. */
/* The following enable debug output from this file.
*
* CONFIG_DEBUG_SPI && CONFIG_DEBUG - Define to enable basic SPI debug
* CONFIG_DEBUG_VERBOSE - Define to enable verbose SPI debug
*/
#ifndef CONFIG_DEBUG
# undef CONFIG_DEBUG_SPI
# undef CONFIG_DEBUG_VERBOSE
#endif
#ifdef CONFIG_DEBUG_SPI
# define spidbg lldbg
# ifdef CONFIG_DEBUG_VERBOSE
# define spivdbg lldbg
# else
# define spivdbg(x...)
# endif
#else
# define spidbg(x...)
# define spivdbg(x...)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: pic32mx_spiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the Sure PIC32MX board.
*
************************************************************************************/
void weak_function pic32mx_spiinitialize(void)
{
/* Configure the SPI2 chip select (CS) GPIO output, and the card detect (CD) and
* write protect (WP) inputs.
*/
pic32mx_configgpio(GPIO_SD_CS);
pic32mx_configgpio(GPIO_SD_CD);
pic32mx_configgpio(GPIO_SD_WD);
}
/************************************************************************************
* Name: pic32mx_spi2select and pic32mx_spi2status
*
* Description:
* The external functions, pic32mx_spi2select and pic32mx_spi2status
* must be provided by board-specific logic. They are implementations of the select
* and status 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 PIC32MX logic. To use this common SPI logic on your
* board:
*
* 1. Provide logic in pic32mx_boardinitialize() to configure SPI/SPI chip select
* pins.
* 2. Provide pic32mx_spi2select() and pic32mx_spi2status() functions
* in your board-specific logic. These functions will perform chip selection
* and status operations using GPIOs in the way your board is configured.
* 3. Add a calls 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_PIC32MX_SPI2
void pic32mx_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
spivdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
/* The SD card chip select is pulled high and active low */
if (devid == SPIDEV_MMCSD)
{
pic32mx_gpiowrite(GPIO_SD_CS, !selected);
}
}
uint8_t pic32mx_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
uint8_t ret = 0;
/* Card detect is pull up on-board. If a low value is sensed then the card must
* be present.
*/
if (!pic32mx_gpioread(GPIO_SD_CD))
{
ret = SPI_STATUS_PRESENT;
/* It seems that a high value indicatest the the card is write protected. */
if (pic32mx_gpioread(GPIO_SD_WD))
{
ret |= SPI_STATUS_WRPROTECTED;
}
}
spivdbg("Returning %d\n", ret);
return ret;
}
#endif
#endif /* CONFIG_PIC32MX_SPI2 */
|
