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Commit | Line | Data |
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22b238bd AV |
1 | /* |
2 | * SPI testing utility (using spidev driver) | |
3 | * | |
4 | * Copyright (c) 2007 MontaVista Software, Inc. | |
5 | * Copyright (c) 2007 Anton Vorontsov <avorontsov@ru.mvista.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License. | |
10 | * | |
11 | * Cross-compile with cross-gcc -I/path/to/cross-kernel/include | |
12 | */ | |
13 | ||
14 | #include <stdint.h> | |
15 | #include <unistd.h> | |
16 | #include <stdio.h> | |
17 | #include <stdlib.h> | |
18 | #include <getopt.h> | |
19 | #include <fcntl.h> | |
20 | #include <sys/ioctl.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/spi/spidev.h> | |
23 | ||
24 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) | |
25 | ||
26 | static void pabort(const char *s) | |
27 | { | |
28 | perror(s); | |
29 | abort(); | |
30 | } | |
31 | ||
cd58310d | 32 | static const char *device = "/dev/spidev1.1"; |
22b238bd AV |
33 | static uint8_t mode; |
34 | static uint8_t bits = 8; | |
35 | static uint32_t speed = 500000; | |
36 | static uint16_t delay; | |
37 | ||
38 | static void transfer(int fd) | |
39 | { | |
40 | int ret; | |
41 | uint8_t tx[] = { | |
42 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
43 | 0x40, 0x00, 0x00, 0x00, 0x00, 0x95, | |
44 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
45 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
46 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
47 | 0xDE, 0xAD, 0xBE, 0xEF, 0xBA, 0xAD, | |
48 | 0xF0, 0x0D, | |
49 | }; | |
50 | uint8_t rx[ARRAY_SIZE(tx)] = {0, }; | |
51 | struct spi_ioc_transfer tr = { | |
52 | .tx_buf = (unsigned long)tx, | |
53 | .rx_buf = (unsigned long)rx, | |
54 | .len = ARRAY_SIZE(tx), | |
55 | .delay_usecs = delay, | |
56 | .speed_hz = speed, | |
57 | .bits_per_word = bits, | |
58 | }; | |
59 | ||
60 | ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); | |
61 | if (ret == 1) | |
62 | pabort("can't send spi message"); | |
63 | ||
64 | for (ret = 0; ret < ARRAY_SIZE(tx); ret++) { | |
65 | if (!(ret % 6)) | |
66 | puts(""); | |
67 | printf("%.2X ", rx[ret]); | |
68 | } | |
69 | puts(""); | |
70 | } | |
71 | ||
cd58310d | 72 | void print_usage(const char *prog) |
22b238bd AV |
73 | { |
74 | printf("Usage: %s [-DsbdlHOLC3]\n", prog); | |
75 | puts(" -D --device device to use (default /dev/spidev1.1)\n" | |
76 | " -s --speed max speed (Hz)\n" | |
77 | " -d --delay delay (usec)\n" | |
78 | " -b --bpw bits per word \n" | |
79 | " -l --loop loopback\n" | |
80 | " -H --cpha clock phase\n" | |
81 | " -O --cpol clock polarity\n" | |
82 | " -L --lsb least significant bit first\n" | |
83 | " -C --cs-high chip select active high\n" | |
84 | " -3 --3wire SI/SO signals shared\n"); | |
85 | exit(1); | |
86 | } | |
87 | ||
88 | void parse_opts(int argc, char *argv[]) | |
89 | { | |
90 | while (1) { | |
cd58310d | 91 | static const struct option lopts[] = { |
22b238bd AV |
92 | { "device", 1, 0, 'D' }, |
93 | { "speed", 1, 0, 's' }, | |
94 | { "delay", 1, 0, 'd' }, | |
95 | { "bpw", 1, 0, 'b' }, | |
96 | { "loop", 0, 0, 'l' }, | |
97 | { "cpha", 0, 0, 'H' }, | |
98 | { "cpol", 0, 0, 'O' }, | |
99 | { "lsb", 0, 0, 'L' }, | |
100 | { "cs-high", 0, 0, 'C' }, | |
101 | { "3wire", 0, 0, '3' }, | |
102 | { NULL, 0, 0, 0 }, | |
103 | }; | |
104 | int c; | |
105 | ||
106 | c = getopt_long(argc, argv, "D:s:d:b:lHOLC3", lopts, NULL); | |
107 | ||
108 | if (c == -1) | |
109 | break; | |
110 | ||
111 | switch (c) { | |
112 | case 'D': | |
113 | device = optarg; | |
114 | break; | |
115 | case 's': | |
116 | speed = atoi(optarg); | |
117 | break; | |
118 | case 'd': | |
119 | delay = atoi(optarg); | |
120 | break; | |
121 | case 'b': | |
122 | bits = atoi(optarg); | |
123 | break; | |
124 | case 'l': | |
125 | mode |= SPI_LOOP; | |
126 | break; | |
127 | case 'H': | |
128 | mode |= SPI_CPHA; | |
129 | break; | |
130 | case 'O': | |
131 | mode |= SPI_CPOL; | |
132 | break; | |
133 | case 'L': | |
134 | mode |= SPI_LSB_FIRST; | |
135 | break; | |
136 | case 'C': | |
137 | mode |= SPI_CS_HIGH; | |
138 | break; | |
139 | case '3': | |
140 | mode |= SPI_3WIRE; | |
141 | break; | |
142 | default: | |
143 | print_usage(argv[0]); | |
144 | break; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | int main(int argc, char *argv[]) | |
150 | { | |
151 | int ret = 0; | |
152 | int fd; | |
153 | ||
154 | parse_opts(argc, argv); | |
155 | ||
156 | fd = open(device, O_RDWR); | |
157 | if (fd < 0) | |
158 | pabort("can't open device"); | |
159 | ||
160 | /* | |
161 | * spi mode | |
162 | */ | |
163 | ret = ioctl(fd, SPI_IOC_WR_MODE, &mode); | |
164 | if (ret == -1) | |
165 | pabort("can't set spi mode"); | |
166 | ||
167 | ret = ioctl(fd, SPI_IOC_RD_MODE, &mode); | |
168 | if (ret == -1) | |
169 | pabort("can't get spi mode"); | |
170 | ||
171 | /* | |
172 | * bits per word | |
173 | */ | |
174 | ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits); | |
175 | if (ret == -1) | |
176 | pabort("can't set bits per word"); | |
177 | ||
178 | ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits); | |
179 | if (ret == -1) | |
180 | pabort("can't get bits per word"); | |
181 | ||
182 | /* | |
183 | * max speed hz | |
184 | */ | |
185 | ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed); | |
186 | if (ret == -1) | |
187 | pabort("can't set max speed hz"); | |
188 | ||
189 | ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed); | |
190 | if (ret == -1) | |
191 | pabort("can't get max speed hz"); | |
192 | ||
193 | printf("spi mode: %d\n", mode); | |
194 | printf("bits per word: %d\n", bits); | |
195 | printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000); | |
196 | ||
197 | transfer(fd); | |
198 | ||
199 | close(fd); | |
200 | ||
201 | return ret; | |
202 | } |