linux 測試 SPI 測試應用程式代碼

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測試硬體平台：TI  AM335X

測試代碼：

/* * SPI testing utility (using spidev driver) * * Copyright (c) 2007  MontaVista Software, Inc. * Copyright (c) 2007  Anton Vorontsov <avorontsov@ru.mvista.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License. * * Cross-compile with cross-gcc -I/path/to/cross-kernel/include */#include <stdint.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <getopt.h>#include <fcntl.h>#include <sys/ioctl.h>#include <linux/types.h>#include <linux/spi/spidev.h>#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))static void pabort(const char *s){perror(s);abort();}static const char *device = "/dev/spidev1.1";static uint8_t mode;static uint8_t bits = 8;static uint32_t speed = 500000;static uint16_t delay;uint8_t tx[4096] = {0};uint8_t rx[ARRAY_SIZE(tx)] = {0, };static void transfer(int fd){int ret;struct spi_ioc_transfer tr = {.tx_buf = (unsigned long)tx,.rx_buf = (unsigned long)rx,.len = ARRAY_SIZE(tx),.delay_usecs = delay,.speed_hz = speed,.bits_per_word = bits,};ret = ioctl(fd, SPI_IOC_MESSAGE(1), &tr);if (ret < 1)pabort("can't send spi message");//for (ret = 0; ret < ARRAY_SIZE(tx); ret++) {//if (!(ret % 6))//puts("");//printf("%.2X ", rx[ret]);//}puts("");}static void print_usage(const char *prog){printf("Usage: %s [-DsbdlHOLC3]\n", prog);puts("  -D --device   device to use (default /dev/spidev1.1)\n"     "  -s --speed    max speed (Hz)\n"     "  -d --delay    delay (usec)\n"     "  -b --bpw      bits per word \n"     "  -l --loop     loopback\n"     "  -H --cpha     clock phase\n"     "  -O --cpol     clock polarity\n"     "  -L --lsb      least significant bit first\n"     "  -C --cs-high  chip select active high\n"     "  -3 --3wire    SI/SO signals shared\n");exit(1);}static void parse_opts(int argc, char *argv[]){while (1) {static const struct option lopts[] = {{ "device",  1, 0, 'D' },{ "speed",   1, 0, 's' },{ "delay",   1, 0, 'd' },{ "bpw",     1, 0, 'b' },{ "loop",    0, 0, 'l' },{ "cpha",    0, 0, 'H' },{ "cpol",    0, 0, 'O' },{ "lsb",     0, 0, 'L' },{ "cs-high", 0, 0, 'C' },{ "3wire",   0, 0, '3' },{ "no-cs",   0, 0, 'N' },{ "ready",   0, 0, 'R' },{ NULL, 0, 0, 0 },};int c;c = getopt_long(argc, argv, "D:s:d:b:lHOLC3NR", lopts, NULL);if (c == -1)break;switch (c) {case 'D':device = optarg;break;case 's':speed = atoi(optarg);break;case 'd':delay = atoi(optarg);break;case 'b':bits = atoi(optarg);break;case 'l':mode |= SPI_LOOP;break;case 'H':mode |= SPI_CPHA;break;case 'O':mode |= SPI_CPOL;break;case 'L':mode |= SPI_LSB_FIRST;break;case 'C':mode |= SPI_CS_HIGH;break;case '3':mode |= SPI_3WIRE;break;case 'N':mode |= SPI_NO_CS;break;case 'R':mode |= SPI_READY;break;default:print_usage(argv[0]);break;}}}int main(int argc, char *argv[]){int err = 0;unsigned char cmd = 32;unsigned int mode = 0;int handle_spi1dev = 0;int ret = 0;printf("init_SPI1()++\n");printf("handle_spi1dev = %x \n", handle_spi1dev);handle_spi1dev = open("/dev/spidev1.0",O_RDWR);if(handle_spi1dev < 0){printf("/dev/spidev1.0 error \n");}mode = SPI_CPHA;err = ioctl(handle_spi1dev, SPI_IOC_WR_BITS_PER_WORD,&cmd);//change spi to 32bits modeif (err == -1)printf("can't set spi mode\n");err = ioctl(handle_spi1dev, SPI_IOC_WR_MODE, &mode);if (err == -1)printf("can't set spi mode\n");printf("handle_spi1dev = %x \n", handle_spi1dev);printf("init_SPI1()--\n");transfer(handle_spi1dev);close(handle_spi1dev);return ret;}

測試結果：

當前SPI 驅動介面最多一次轉送 4K Bytes 大小的資料