forked from Imagelibrary/rtems
1618e69f0e
This adds some commands that are usefull for debugging simple serial interfaces. Even if they are a complete re-implementation, the i2c* commands use a simmilar call like the Linux i2c tools.
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (C) 2020 embedded brains GmbH.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The command implemented here has a similar interface like the one from Linux
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* i2c tools. Think of it as a heavily simplified version of them. Instead of
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* the bus number they expect a bus path.
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*/
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#include <dev/i2c/i2c.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <rtems/shell.h>
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static const char rtems_i2cdetect_shell_usage [] =
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"i2cdetect <I2C_BUS>\n"
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"\ttry to detect i2c devices on the given bus\n";
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static int rtems_i2cdetect_shell_main(int argc, char *argv[])
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{
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int fd;
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int rv;
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const char *bus;
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const uint16_t first = 1;
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const uint16_t last = 0x7f;
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uint16_t current;
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if (argc != 2 || strcmp(argv[1], "-h") == 0) {
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printf(rtems_i2cdetect_shell_usage);
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return 1;
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}
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bus = argv[1];
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fd = open(bus, O_RDWR);
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if (fd < 0) {
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perror("Couldn't open bus");
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return 1;
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}
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printf(" x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF\n"
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"0x ");
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for (current = first; current <= last; ++current) {
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i2c_msg msg = {
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.addr = current,
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.flags = 0,
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.len = 0,
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.buf = NULL,
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};
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struct i2c_rdwr_ioctl_data payload = {
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.msgs = &msg,
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.nmsgs = 1,
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};
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if ((current & 0x0F) == 0) {
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printf("\n%1xx ", current >> 4);
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}
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rv = ioctl(fd, I2C_RDWR, &payload);
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if (rv < 0) {
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if (errno != EIO) {
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perror("ioctl failed");
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}
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printf(" --");
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} else {
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printf(" %02x", current);
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}
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}
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printf("\n");
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close(fd);
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return 0;
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}
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rtems_shell_cmd_t rtems_shell_I2CDETECT_Command = {
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.name = "i2cdetect",
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.usage = rtems_i2cdetect_shell_usage,
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.topic = "misc",
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.command = rtems_i2cdetect_shell_main,
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};
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