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Linux/Documentation/spi/spidev_test.c

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  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 
 32 static const char *device = "/dev/spidev1.1";
 33 static uint32_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         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 
 75         ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);
 76         if (ret < 1)
 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 
 87 static void print_usage(const char *prog)
 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"
 99              "  -3 --3wire    SI/SO signals shared\n"
100              "  -N --no-cs    no chip select\n"
101              "  -R --ready    slave pulls low to pause\n"
102              "  -2 --dual     dual transfer\n"
103              "  -4 --quad     quad transfer\n");
104         exit(1);
105 }
106 
107 static void parse_opts(int argc, char *argv[])
108 {
109         while (1) {
110                 static const struct option lopts[] = {
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' },
121                         { "no-cs",   0, 0, 'N' },
122                         { "ready",   0, 0, 'R' },
123                         { "dual",    0, 0, '2' },
124                         { "quad",    0, 0, '4' },
125                         { NULL, 0, 0, 0 },
126                 };
127                 int c;
128 
129                 c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24", lopts, NULL);
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;
165                 case 'N':
166                         mode |= SPI_NO_CS;
167                         break;
168                 case 'R':
169                         mode |= SPI_READY;
170                         break;
171                 case '2':
172                         mode |= SPI_TX_DUAL;
173                         break;
174                 case '4':
175                         mode |= SPI_TX_QUAD;
176                         break;
177                 default:
178                         print_usage(argv[0]);
179                         break;
180                 }
181         }
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         }
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          */
204         ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode);
205         if (ret == -1)
206                 pabort("can't set spi mode");
207 
208         ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode);
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 
234         printf("spi mode: 0x%x\n", mode);
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 }
244 

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