Based on kernel version 4.3. Page generated on 2015-11-02 12:51 EST.
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 <string.h> 19 #include <getopt.h> 20 #include <fcntl.h> 21 #include <sys/ioctl.h> 22 #include <linux/types.h> 23 #include <linux/spi/spidev.h> 24 25 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) 26 27 static void pabort(const char *s) 28 { 29 perror(s); 30 abort(); 31 } 32 33 static const char *device = "/dev/spidev1.1"; 34 static uint32_t mode; 35 static uint8_t bits = 8; 36 static uint32_t speed = 500000; 37 static uint16_t delay; 38 static int verbose; 39 40 uint8_t default_tx[] = { 41 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 42 0x40, 0x00, 0x00, 0x00, 0x00, 0x95, 43 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 44 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 45 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 46 0xF0, 0x0D, 47 }; 48 49 uint8_t default_rx[ARRAY_SIZE(default_tx)] = {0, }; 50 char *input_tx; 51 52 static void hex_dump(const void *src, size_t length, size_t line_size, char *prefix) 53 { 54 int i = 0; 55 const unsigned char *address = src; 56 const unsigned char *line = address; 57 unsigned char c; 58 59 printf("%s | ", prefix); 60 while (length-- > 0) { 61 printf("%02X ", *address++); 62 if (!(++i % line_size) || (length == 0 && i % line_size)) { 63 if (length == 0) { 64 while (i++ % line_size) 65 printf("__ "); 66 } 67 printf(" | "); /* right close */ 68 while (line < address) { 69 c = *line++; 70 printf("%c", (c < 33 || c == 255) ? 0x2E : c); 71 } 72 printf("\n"); 73 if (length > 0) 74 printf("%s | ", prefix); 75 } 76 } 77 } 78 79 /* 80 * Unescape - process hexadecimal escape character 81 * converts shell input "\x23" -> 0x23 82 */ 83 static int unescape(char *_dst, char *_src, size_t len) 84 { 85 int ret = 0; 86 char *src = _src; 87 char *dst = _dst; 88 unsigned int ch; 89 90 while (*src) { 91 if (*src == '\\' && *(src+1) == 'x') { 92 sscanf(src + 2, "%2x", &ch); 93 src += 4; 94 *dst++ = (unsigned char)ch; 95 } else { 96 *dst++ = *src++; 97 } 98 ret++; 99 } 100 return ret; 101 } 102 103 static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len) 104 { 105 int ret; 106 107 struct spi_ioc_transfer tr = { 108 .tx_buf = (unsigned long)tx, 109 .rx_buf = (unsigned long)rx, 110 .len = len, 111 .delay_usecs = delay, 112 .speed_hz = speed, 113 .bits_per_word = bits, 114 }; 115 116 if (mode & SPI_TX_QUAD) 117 tr.tx_nbits = 4; 118 else if (mode & SPI_TX_DUAL) 119 tr.tx_nbits = 2; 120 if (mode & SPI_RX_QUAD) 121 tr.rx_nbits = 4; 122 else if (mode & SPI_RX_DUAL) 123 tr.rx_nbits = 2; 124 if (!(mode & SPI_LOOP)) { 125 if (mode & (SPI_TX_QUAD | SPI_TX_DUAL)) 126 tr.rx_buf = 0; 127 else if (mode & (SPI_RX_QUAD | SPI_RX_DUAL)) 128 tr.tx_buf = 0; 129 } 130 131 ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr); 132 if (ret < 1) 133 pabort("can't send spi message"); 134 135 if (verbose) 136 hex_dump(tx, len, 32, "TX"); 137 hex_dump(rx, len, 32, "RX"); 138 } 139 140 static void print_usage(const char *prog) 141 { 142 printf("Usage: %s [-DsbdlHOLC3]\n", prog); 143 puts(" -D --device device to use (default /dev/spidev1.1)\n" 144 " -s --speed max speed (Hz)\n" 145 " -d --delay delay (usec)\n" 146 " -b --bpw bits per word \n" 147 " -l --loop loopback\n" 148 " -H --cpha clock phase\n" 149 " -O --cpol clock polarity\n" 150 " -L --lsb least significant bit first\n" 151 " -C --cs-high chip select active high\n" 152 " -3 --3wire SI/SO signals shared\n" 153 " -v --verbose Verbose (show tx buffer)\n" 154 " -p Send data (e.g. \"1234\\xde\\xad\")\n" 155 " -N --no-cs no chip select\n" 156 " -R --ready slave pulls low to pause\n" 157 " -2 --dual dual transfer\n" 158 " -4 --quad quad transfer\n"); 159 exit(1); 160 } 161 162 static void parse_opts(int argc, char *argv[]) 163 { 164 while (1) { 165 static const struct option lopts[] = { 166 { "device", 1, 0, 'D' }, 167 { "speed", 1, 0, 's' }, 168 { "delay", 1, 0, 'd' }, 169 { "bpw", 1, 0, 'b' }, 170 { "loop", 0, 0, 'l' }, 171 { "cpha", 0, 0, 'H' }, 172 { "cpol", 0, 0, 'O' }, 173 { "lsb", 0, 0, 'L' }, 174 { "cs-high", 0, 0, 'C' }, 175 { "3wire", 0, 0, '3' }, 176 { "no-cs", 0, 0, 'N' }, 177 { "ready", 0, 0, 'R' }, 178 { "dual", 0, 0, '2' }, 179 { "verbose", 0, 0, 'v' }, 180 { "quad", 0, 0, '4' }, 181 { NULL, 0, 0, 0 }, 182 }; 183 int c; 184 185 c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR24p:v", lopts, NULL); 186 187 if (c == -1) 188 break; 189 190 switch (c) { 191 case 'D': 192 device = optarg; 193 break; 194 case 's': 195 speed = atoi(optarg); 196 break; 197 case 'd': 198 delay = atoi(optarg); 199 break; 200 case 'b': 201 bits = atoi(optarg); 202 break; 203 case 'l': 204 mode |= SPI_LOOP; 205 break; 206 case 'H': 207 mode |= SPI_CPHA; 208 break; 209 case 'O': 210 mode |= SPI_CPOL; 211 break; 212 case 'L': 213 mode |= SPI_LSB_FIRST; 214 break; 215 case 'C': 216 mode |= SPI_CS_HIGH; 217 break; 218 case '3': 219 mode |= SPI_3WIRE; 220 break; 221 case 'N': 222 mode |= SPI_NO_CS; 223 break; 224 case 'v': 225 verbose = 1; 226 break; 227 case 'R': 228 mode |= SPI_READY; 229 break; 230 case 'p': 231 input_tx = optarg; 232 break; 233 case '2': 234 mode |= SPI_TX_DUAL; 235 break; 236 case '4': 237 mode |= SPI_TX_QUAD; 238 break; 239 default: 240 print_usage(argv[0]); 241 break; 242 } 243 } 244 if (mode & SPI_LOOP) { 245 if (mode & SPI_TX_DUAL) 246 mode |= SPI_RX_DUAL; 247 if (mode & SPI_TX_QUAD) 248 mode |= SPI_RX_QUAD; 249 } 250 } 251 252 int main(int argc, char *argv[]) 253 { 254 int ret = 0; 255 int fd; 256 uint8_t *tx; 257 uint8_t *rx; 258 int size; 259 260 parse_opts(argc, argv); 261 262 fd = open(device, O_RDWR); 263 if (fd < 0) 264 pabort("can't open device"); 265 266 /* 267 * spi mode 268 */ 269 ret = ioctl(fd, SPI_IOC_WR_MODE32, &mode); 270 if (ret == -1) 271 pabort("can't set spi mode"); 272 273 ret = ioctl(fd, SPI_IOC_RD_MODE32, &mode); 274 if (ret == -1) 275 pabort("can't get spi mode"); 276 277 /* 278 * bits per word 279 */ 280 ret = ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits); 281 if (ret == -1) 282 pabort("can't set bits per word"); 283 284 ret = ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits); 285 if (ret == -1) 286 pabort("can't get bits per word"); 287 288 /* 289 * max speed hz 290 */ 291 ret = ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed); 292 if (ret == -1) 293 pabort("can't set max speed hz"); 294 295 ret = ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed); 296 if (ret == -1) 297 pabort("can't get max speed hz"); 298 299 printf("spi mode: 0x%x\n", mode); 300 printf("bits per word: %d\n", bits); 301 printf("max speed: %d Hz (%d KHz)\n", speed, speed/1000); 302 303 if (input_tx) { 304 size = strlen(input_tx+1); 305 tx = malloc(size); 306 rx = malloc(size); 307 size = unescape((char *)tx, input_tx, size); 308 transfer(fd, tx, rx, size); 309 free(rx); 310 free(tx); 311 } else { 312 transfer(fd, default_tx, default_rx, sizeof(default_tx)); 313 } 314 315 close(fd); 316 317 return ret; 318 }