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"; |
c2e78c34 | 33 | static uint32_t mode; |
22b238bd AV |
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 | ||
c2e78c34 GU |
60 | if (mode & SPI_TX_QUAD) |
61 | tr.tx_nbits = 4; | |
62 | else if (mode & SPI_TX_DUAL) | |
63 | tr.tx_nbits = 2; | |
64 | if (mode & SPI_RX_QUAD) | |
65 | tr.rx_nbits = 4; | |
66 | else if (mode & SPI_RX_DUAL) | |
67 | tr.rx_nbits = 2; | |
68 | if (!(mode & SPI_LOOP)) { | |
69 | if (mode & (SPI_TX_QUAD | SPI_TX_DUAL)) | |
70 | tr.rx_buf = 0; | |
71 | else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL)) | |
72 | tr.tx_buf = 0; | |
73 | } | |
74 | ||
22b238bd | 75 | ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); |
95b1ed2a | 76 | if (ret < 1) |
22b238bd AV |
77 | pabort("can't send spi message"); |
78 | ||
79 | for (ret = 0; ret < ARRAY_SIZE(tx); ret++) { | |
80 | if (!(ret % 6)) | |
81 | puts(""); | |
82 | printf("%.2X ", rx[ret]); | |
83 | } | |
84 | puts(""); | |
85 | } | |
86 | ||
b7ed698c | 87 | static void print_usage(const char *prog) |
22b238bd AV |
88 | { |
89 | printf("Usage: %s [-DsbdlHOLC3]\n", prog); | |
90 | puts(" -D --device device to use (default /dev/spidev1.1)\n" | |
91 | " -s --speed max speed (Hz)\n" | |
92 | " -d --delay delay (usec)\n" | |
93 | " -b --bpw bits per word \n" | |
94 | " -l --loop loopback\n" | |
95 | " -H --cpha clock phase\n" | |
96 | " -O --cpol clock polarity\n" | |
97 | " -L --lsb least significant bit first\n" | |
98 | " -C --cs-high chip select active high\n" | |
925d16a2 GU |
99 | " -3 --3wire SI/SO signals shared\n" |
100 | " -N --no-cs no chip select\n" | |
c2e78c34 GU |
101 | " -R --ready slave pulls low to pause\n" |
102 | " -2 --dual dual transfer\n" | |
103 | " -4 --quad quad transfer\n"); | |
22b238bd AV |
104 | exit(1); |
105 | } | |
106 | ||
b7ed698c | 107 | static void parse_opts(int argc, char *argv[]) |
22b238bd AV |
108 | { |
109 | while (1) { | |
cd58310d | 110 | static const struct option lopts[] = { |
22b238bd AV |
111 | { "device", 1, 0, 'D' }, |
112 | { "speed", 1, 0, 's' }, | |
113 | { "delay", 1, 0, 'd' }, | |
114 | { "bpw", 1, 0, 'b' }, | |
115 | { "loop", 0, 0, 'l' }, | |
116 | { "cpha", 0, 0, 'H' }, | |
117 | { "cpol", 0, 0, 'O' }, | |
118 | { "lsb", 0, 0, 'L' }, | |
119 | { "cs-high", 0, 0, 'C' }, | |
120 | { "3wire", 0, 0, '3' }, | |
b55f627f DB |
121 | { "no-cs", 0, 0, 'N' }, |
122 | { "ready", 0, 0, 'R' }, | |
c2e78c34 GU |
123 | { "dual", 0, 0, '2' }, |
124 | { "quad", 0, 0, '4' }, | |
22b238bd AV |
125 | { NULL, 0, 0, 0 }, |
126 | }; | |
127 | int c; | |
128 | ||
c2e78c34 | 129 | c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24", lopts, NULL); |
22b238bd AV |
130 | |
131 | if (c == -1) | |
132 | break; | |
133 | ||
134 | switch (c) { | |
135 | case 'D': | |
136 | device = optarg; | |
137 | break; | |
138 | case 's': | |
139 | speed = atoi(optarg); | |
140 | break; | |
141 | case 'd': | |
142 | delay = atoi(optarg); | |
143 | break; | |
144 | case 'b': | |
145 | bits = atoi(optarg); | |
146 | break; | |
147 | case 'l': | |
148 | mode |= SPI_LOOP; | |
149 | break; | |
150 | case 'H': | |
151 | mode |= SPI_CPHA; | |
152 | break; | |
153 | case 'O': | |
154 | mode |= SPI_CPOL; | |
155 | break; | |
156 | case 'L': | |
157 | mode |= SPI_LSB_FIRST; | |
158 | break; | |
159 | case 'C': | |
160 | mode |= SPI_CS_HIGH; | |
161 | break; | |
162 | case '3': | |
163 | mode |= SPI_3WIRE; | |
164 | break; | |
b55f627f DB |
165 | case 'N': |
166 | mode |= SPI_NO_CS; | |
167 | break; | |
168 | case 'R': | |
169 | mode |= SPI_READY; | |
170 | break; | |
c2e78c34 GU |
171 | case '2': |
172 | mode |= SPI_TX_DUAL; | |
173 | break; | |
174 | case '4': | |
175 | mode |= SPI_TX_QUAD; | |
176 | break; | |
22b238bd AV |
177 | default: |
178 | print_usage(argv[0]); | |
179 | break; | |
180 | } | |
181 | } | |
c2e78c34 GU |
182 | if (mode & SPI_LOOP) { |
183 | if (mode & SPI_TX_DUAL) | |
184 | mode |= SPI_RX_DUAL; | |
185 | if (mode & SPI_TX_QUAD) | |
186 | mode |= SPI_RX_QUAD; | |
187 | } | |
22b238bd AV |
188 | } |
189 | ||
190 | int main(int argc, char *argv[]) | |
191 | { | |
192 | int ret = 0; | |
193 | int fd; | |
194 | ||
195 | parse_opts(argc, argv); | |
196 | ||
197 | fd = open(device, O_RDWR); | |
198 | if (fd < 0) | |
199 | pabort("can't open device"); | |
200 | ||
201 | /* | |
202 | * spi mode | |
203 | */ | |
c2e78c34 | 204 | ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode); |
22b238bd AV |
205 | if (ret == -1) |
206 | pabort("can't set spi mode"); | |
207 | ||
c2e78c34 | 208 | ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode); |
22b238bd AV |
209 | if (ret == -1) |
210 | pabort("can't get spi mode"); | |
211 | ||
212 | /* | |
213 | * bits per word | |
214 | */ | |
215 | ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits); | |
216 | if (ret == -1) | |
217 | pabort("can't set bits per word"); | |
218 | ||
219 | ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits); | |
220 | if (ret == -1) | |
221 | pabort("can't get bits per word"); | |
222 | ||
223 | /* | |
224 | * max speed hz | |
225 | */ | |
226 | ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed); | |
227 | if (ret == -1) | |
228 | pabort("can't set max speed hz"); | |
229 | ||
230 | ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed); | |
231 | if (ret == -1) | |
232 | pabort("can't get max speed hz"); | |
233 | ||
c2e78c34 | 234 | printf("spi mode: 0x%x\n", mode); |
22b238bd AV |
235 | printf("bits per word: %d\n", bits); |
236 | printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000); | |
237 | ||
238 | transfer(fd); | |
239 | ||
240 | close(fd); | |
241 | ||
242 | return ret; | |
243 | } |