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c06335b71b
Previously `shell_commands` was a "catch-all" module that included shell commands for each and every used module that has a shell companion. Instead, the new `shell_cmds` module is now used to provide shell commands as individually selectable submodules, e.g. `cmd_gnrc_icmpv6_echo` now provides the ICMPv6 echo command (a.k.a. ping). To still have a "catch all" module to pull in shell commands of modules already used, `shell_cmds_default` was introduced. `shell_commands` depends now on `shell_cmds_default` for backward compatibility, but has been deprecated. New apps should use `shell_cmds_default` instead. For a handful of shell commands individual selection was already possible. Those modules now depend on the corresponding `cmd_%` module and they have been deprecated.
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
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* Copyright (C) 2019 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_shell_commands
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* @{
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*
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* @file
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* @brief An I2C bus scanner
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*
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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*/
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#include <errno.h>
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#include <stdint.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 "board.h"
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#include "periph/i2c.h"
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#include "shell.h"
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static int get_dev(i2c_t *dev, int argc, char **argv)
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{
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if (argc == 2) {
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int idx = atoi(argv[1]);
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if ((idx < 0) || (idx >= (int)I2C_NUMOF)) {
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printf("I2C device with number \"%s\" not found\n", argv[1]);
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}
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else {
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*dev = I2C_DEV(idx);
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return 0;
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}
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}
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printf("Usage: %s [DEVICE_NUMBER]\n", argv[0]);
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return -1;
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}
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static inline int is_addr_reserved(uint16_t addr)
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{
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if ((addr < 0x0e) || (addr > 0x77))
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return 1;
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return 0;
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}
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static int _i2c_scan(int argc, char **argv)
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{
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i2c_t dev;
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if (get_dev(&dev, argc, argv)) {
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return -1;
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}
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printf("Scanning I2C device %s...\n", argv[1]);
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i2c_acquire(dev);
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puts(
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"addr not ack'ed = \"-\", addr ack'ed = \"X\", addr reserved = \"R\", error = \"E\"\n"
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" 0 1 2 3 4 5 6 7 8 9 a b c d e f"
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);
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for (char i = 0; i < 8; i++) {
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char row[] = { '0', 'x', '0' + i, '0', '\0' };
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fputs(row, stdout);
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uint16_t addr = i;
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addr <<= 4;
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for (unsigned j = 0; j < 16; j++) {
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char str[] = { ' ', '-', '\0' };
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if (is_addr_reserved(addr)) {
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str[1] = 'R';
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}
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else {
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char dummy[1];
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int retval;
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while (-EAGAIN == (retval = i2c_read_byte(dev, addr, dummy, 0))) {
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/* retry until bus arbitration succeeds */
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}
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switch (retval) {
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case 0:
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/* success: Device did respond */
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str[1] = 'X';
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break;
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case -ENXIO:
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/* No ACK --> no device */
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break;
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default:
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/* Some unexpected error */
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str[1] = 'E';
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break;
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}
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}
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fputs(str, stdout);
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addr++;
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}
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puts("");
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}
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i2c_release(dev);
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return 0;
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}
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SHELL_COMMAND(i2c_scan, "Performs an I2C bus scan", _i2c_scan);
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