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1 | #include <stdio.h> |
2 | #include <unistd.h> |
3 | #include <stdlib.h> |
4 | #include <fcntl.h> |
5 | #include <string.h> |
6 | |
7 | #include <sys/ioctl.h> |
8 | #include <sys/types.h> |
9 | #include <sys/stat.h> |
10 | |
11 | #include <linux/types.h> |
12 | #include <linux/spi/spidev.h> |
13 | |
14 | |
15 | static int verbose; |
16 | |
17 | static void do_read(int fd, int len) |
18 | { |
19 | unsigned char buf[32], *bp; |
20 | int status; |
21 | |
22 | /* read at least 2 bytes, no more than 32 */ |
23 | if (len < 2) |
24 | len = 2; |
25 | else if (len > sizeof(buf)) |
26 | len = sizeof(buf); |
27 | memset(buf, 0, sizeof buf); |
28 | |
29 | status = read(fd, buf, len); |
30 | if (status < 0) { |
31 | perror("read"); |
32 | return; |
33 | } |
34 | if (status != len) { |
35 | fprintf(stderr, "short read\n"); |
36 | return; |
37 | } |
38 | |
39 | printf("read(%2d, %2d): %02x %02x,", len, status, |
40 | buf[0], buf[1]); |
41 | status -= 2; |
42 | bp = buf + 2; |
43 | while (status-- > 0) |
44 | printf(" %02x", *bp++); |
45 | printf("\n"); |
46 | } |
47 | |
48 | static void do_msg(int fd, int len) |
49 | { |
50 | struct spi_ioc_transfer xfer[2]; |
51 | unsigned char buf[32], *bp; |
52 | int status; |
53 | |
54 | memset(xfer, 0, sizeof xfer); |
55 | memset(buf, 0, sizeof buf); |
56 | |
57 | if (len > sizeof buf) |
58 | len = sizeof buf; |
59 | |
60 | buf[0] = 0xaa; |
61 | xfer[0].tx_buf = (unsigned long)buf; |
62 | xfer[0].len = 1; |
63 | |
64 | xfer[1].rx_buf = (unsigned long) buf; |
65 | xfer[1].len = len; |
66 | |
67 | status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer); |
68 | if (status < 0) { |
69 | perror("SPI_IOC_MESSAGE"); |
70 | return; |
71 | } |
72 | |
73 | printf("response(%2d, %2d): ", len, status); |
74 | for (bp = buf; len; len--) |
75 | printf(" %02x", *bp++); |
76 | printf("\n"); |
77 | } |
78 | |
79 | static void dumpstat(const char *name, int fd) |
80 | { |
81 | __u8 mode, lsb, bits; |
82 | __u32 speed; |
83 | |
84 | if (ioctl(fd, SPI_IOC_RD_MODE, &mode) < 0) { |
85 | perror("SPI rd_mode"); |
86 | return; |
87 | } |
88 | if (ioctl(fd, SPI_IOC_RD_LSB_FIRST, &lsb) < 0) { |
89 | perror("SPI rd_lsb_fist"); |
90 | return; |
91 | } |
92 | if (ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0) { |
93 | perror("SPI bits_per_word"); |
94 | return; |
95 | } |
96 | if (ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0) { |
97 | perror("SPI max_speed_hz"); |
98 | return; |
99 | } |
100 | |
101 | printf("%s: spi mode %d, %d bits %sper word, %d Hz max\n", |
102 | name, mode, bits, lsb ? "(lsb first) " : "", speed); |
103 | } |
104 | |
105 | int main(int argc, char **argv) |
106 | { |
107 | int c; |
108 | int readcount = 0; |
109 | int msglen = 0; |
110 | int fd; |
111 | const char *name; |
112 | |
113 | while ((c = getopt(argc, argv, "hm:r:v")) != EOF) { |
114 | switch (c) { |
115 | case 'm': |
116 | msglen = atoi(optarg); |
117 | if (msglen < 0) |
118 | goto usage; |
119 | continue; |
120 | case 'r': |
121 | readcount = atoi(optarg); |
122 | if (readcount < 0) |
123 | goto usage; |
124 | continue; |
125 | case 'v': |
126 | verbose++; |
127 | continue; |
128 | case 'h': |
129 | case '?': |
130 | usage: |
131 | fprintf(stderr, |
132 | "usage: %s [-h] [-m N] [-r N] /dev/spidevB.D\n", |
133 | argv[0]); |
134 | return 1; |
135 | } |
136 | } |
137 | |
138 | if ((optind + 1) != argc) |
139 | goto usage; |
140 | name = argv[optind]; |
141 | |
142 | fd = open(name, O_RDWR); |
143 | if (fd < 0) { |
144 | perror("open"); |
145 | return 1; |
146 | } |
147 | |
148 | dumpstat(name, fd); |
149 | |
150 | if (msglen) |
151 | do_msg(fd, msglen); |
152 | |
153 | if (readcount) |
154 | do_read(fd, readcount); |
155 | |
156 | close(fd); |
157 | return 0; |
158 | } |
159 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9