11 #include <linux/types.h>
12 #include <linux/spi/spidev.h>
17 static void do_read(int fd, int len)
19 unsigned char buf[32], *bp;
22 /* read at least 2 bytes, no more than 32 */
25 else if (len > sizeof(buf))
27 memset(buf, 0, sizeof buf);
29 status = read(fd, buf, len);
35 fprintf(stderr, "short read\n");
39 printf("read(%2d, %2d): %02x %02x,", len, status,
44 printf(" %02x", *bp++);
48 static void do_msg(int fd, int len)
50 struct spi_ioc_transfer xfer[2];
51 unsigned char buf[32], *bp;
54 memset(xfer, 0, sizeof xfer);
55 memset(buf, 0, sizeof buf);
61 xfer[0].tx_buf = (unsigned long)buf;
64 xfer[1].rx_buf = (unsigned long) buf;
67 status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer);
69 perror("SPI_IOC_MESSAGE");
73 printf("response(%2d, %2d): ", len, status);
74 for (bp = buf; len; len--)
75 printf(" %02x", *bp++);
79 static void dumpstat(const char *name, int fd)
84 if (ioctl(fd, SPI_IOC_RD_MODE32, &mode) < 0) {
85 perror("SPI rd_mode");
88 if (ioctl(fd, SPI_IOC_RD_LSB_FIRST, &lsb) < 0) {
89 perror("SPI rd_lsb_fist");
92 if (ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0) {
93 perror("SPI bits_per_word");
96 if (ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0) {
97 perror("SPI max_speed_hz");
101 printf("%s: spi mode 0x%x, %d bits %sper word, %d Hz max\n",
102 name, mode, bits, lsb ? "(lsb first) " : "", speed);
105 int main(int argc, char **argv)
113 while ((c = getopt(argc, argv, "hm:r:v")) != EOF) {
116 msglen = atoi(optarg);
121 readcount = atoi(optarg);
132 "usage: %s [-h] [-m N] [-r N] /dev/spidevB.D\n",
138 if ((optind + 1) != argc)
142 fd = open(name, O_RDWR);
154 do_read(fd, readcount);