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
|
/*
* (C) Copyright 2002
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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
*/
/*
* SPI Read/Write Utilities
*/
#include <common.h>
#include <command.h>
#include <spi.h>
/*-----------------------------------------------------------------------
* Definitions
*/
#ifndef MAX_SPI_BYTES
# define MAX_SPI_BYTES 32 /* Maximum number of bytes we can handle */
#endif
#ifndef CONFIG_DEFAULT_SPI_BUS
# define CONFIG_DEFAULT_SPI_BUS 0
#endif
#ifndef CONFIG_DEFAULT_SPI_MODE
# define CONFIG_DEFAULT_SPI_MODE SPI_MODE_0
#endif
/*
* Values from last command.
*/
static unsigned int device;
static int bitlen;
static uchar dout[MAX_SPI_BYTES];
static uchar din[MAX_SPI_BYTES];
static uchar *din_p = (uchar *) &din;
static unsigned int bus = CONFIG_DEFAULT_SPI_BUS;
static unsigned int mode = CONFIG_DEFAULT_SPI_MODE;
static unsigned int max_hz = 1000000;
/*
* SPI read/write
*
* Syntax:
* spi {dev} {num_bits} {dout} {use_din} {din} {bus} {max_hz}
* {dev} is the device number for controlling chip select (see TBD)
* {num_bits} is the number of bits to send & receive (base 10)
* {dout} is a hexadecimal string of data to send
* {use_din} is wether we should ignore the received data or not
* {bus} is which on the SPI controller to use
* {mode} is the mode flag used for initializing the SPI slave
* {max_hz} is the maximum allowed frequenzy
* The command prints the hexadecimal string sent and received via SPI.
*/
int do_spi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
struct spi_slave *slave;
char *cp = 0;
uchar tmp;
int j;
int rcode = 0;
/*
* We use the last specified parameters, unless new ones are
* entered.
*/
if ((flag & CMD_FLAG_REPEAT) == 0)
{
if (argc >= 2)
device = simple_strtoul(argv[1], NULL, 10);
if (argc >= 3)
bitlen = simple_strtoul(argv[2], NULL, 10);
if (argc >= 4) {
cp = argv[3];
for(j = 0; *cp; j++, cp++) {
tmp = *cp - '0';
if(tmp > 9)
tmp -= ('A' - '0') - 10;
if(tmp > 15)
tmp -= ('a' - 'A');
if(tmp > 15) {
printf("Hex conversion error on %c, giving up.\n", *cp);
return 1;
}
if((j % 2) == 0)
dout[j / 2] = (tmp << 4);
else
dout[j / 2] |= tmp;
}
}
if (argc >= 5) {
if (0 == simple_strtoul(argv[4], NULL, 10))
din_p = NULL;
else
din_p = (uchar *) &din;
}
if (argc >= 6)
bus = simple_strtoul(argv[5], NULL, 10);
if (argc >= 7)
mode = simple_strtoul(argv[6], NULL, 10);
if (argc >= 8)
max_hz = simple_strtoul(argv[7], NULL, 10);
}
if ((bitlen < 0) || (bitlen > (MAX_SPI_BYTES * 8))) {
printf("Invalid bitlen %d, giving up.\n", bitlen);
return 1;
}
slave = spi_setup_slave(bus, device, max_hz, mode);
if (!slave) {
printf("Invalid device %d, giving up.\n", device);
return 1;
}
debug ("spi chipsel = %08X\n", device);
printf("dout: 0x");
for (j = 0; j < ((bitlen + 7) / 8); j++)
printf("%02X", dout[j]);
printf("\n");
spi_claim_bus(slave);
if (spi_xfer(slave, bitlen, dout, din_p,
SPI_XFER_BEGIN | SPI_XFER_END) != 0) {
printf("Error with the SPI transaction.\n");
rcode = 1;
} else {
if (din_p != NULL) {
printf("din: 0x");
for (j = 0; j < ((bitlen + 7) / 8); j++)
printf("%02X", din[j]);
printf("\n");
} else
printf("SPI message sent successfully.\n");
}
spi_release_bus(slave);
spi_free_slave(slave);
return rcode;
}
/***************************************************/
U_BOOT_CMD(
sspi, 8, 1, do_spi,
"SPI utility commands",
"Send <bit_len> bits from <dout> out the SPI\n"
"<device> <bit_len> <dout> <use_din> <bus> <mode> <max_hz>\n"
" <device> - Identifies the chip select of the device\n"
" <bit_len> - Number of bits to send (base 10)\n"
" <dout> - Hexadecimal string that gets sent\n"
" <use_din> - 0 if no data should be read, != 0 otherwise\n"
" <bus> - The bus of the SPI controller\n"
" <mode> - Mode flag\n"
" <max_hz> - The maximum allowed frequency for the transfers\n"
);
|
