sergiotarxz/nuttx-apps
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

apps/system/i2c: Allow registers besides 0x00 in the dev command.

Browse Source
This commit is contained in:
akob Haufe 2018-08-30 06:35:12 -06:00 committed by Gregory Nutt
parent cef306e335
commit d7d541e2d9
2 changed files with 48 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
system/i2c/README.txt
View File

@ -221,11 +221,19 @@ The 'dev' command will attempt to identify all of the I2C devices on the
selected bus. The <first> and <last> arguments are 7-bit, hexadecimal
I2C addresses. This command will examine a range of addresses beginning
with <first> and continuing through <last>. It will request the value
of register zero from each device.
of register address zero from each device.
If the device at an address responds, then this command will display the
address of the device. If the device does not respond, this command will
display "--". The resulting display is like:
The register address of zero is always used by default. The previous
"sticky" register address is ignored. Some devices may not respond to
ergister address zero, however. To work around this, you can provide a
new "sticky" register address on the command as an option to the 'dev'
command. Then that new "sticky" register address will be used instead
of the address zero.
If the device at an I2C address responds to the read request, then the
'dev' command will display the I2C address of the device. If the device
does not respond, this command will display "--". The resulting display
looks like:
nsh> i2c dev 03 77
0 1 2 3 4 5 6 7 8 9 a b c d e f

41
system/i2c/i2c_dev.c
View File

@ -1,7 +1,7 @@
/****************************************************************************
* apps/system/i2c/i2c_dev.c
*
* Copyright (C) 2011, 2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2011, 2016, 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -64,6 +64,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
} u;
uint8_t regaddr;
uint8_t saveaddr;
long first;
long last;
int addr;
@ -74,11 +75,20 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
int i;
int j;
/* A register address other than zero may be provided on the command line.
* However, for backward compatibility, the address zero will be used
* unless the address is specifically included on the command line for
* this command.
*/
saveaddr = i2ctool->regaddr;
i2ctool->regaddr = 0;
/* Parse any command line arguments */
for (argndx = 1; argndx < argc; )
{
/* Break out of the look when the last option has been parsed */
/* Break out of the loop when the last option has been parsed */
ptr = argv[argndx];
if (*ptr != '-')
@ -91,8 +101,9 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
nargs = i2ctool_common_args(i2ctool, &argv[argndx]);
if (nargs < 0)
{
return ERROR;
goto errout;
}
argndx += nargs;
}
@ -107,7 +118,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
if (first < 0 || first > 0x7f || last < 0 || last > 0x7f || first > last)
{
i2ctool_printf(i2ctool, g_i2cargrange, argv[0]);
return ERROR;
goto errout;
}
argndx += 2;
@ -115,13 +126,13 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
else
{
i2ctool_printf(i2ctool, g_i2cargrequired, argv[0]);
return ERROR;
goto errout;
}
if (argndx != argc)
{
i2ctool_printf(i2ctool, g_i2ctoomanyargs, argv[0]);
return ERROR;
goto errout;
}
/* Get a handle to the I2C bus */
@ -130,7 +141,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
if (fd < 0)
{
i2ctool_printf(i2ctool, "Failed to get bus %d\n", i2ctool->bus);
return ERROR;
goto errout;
}
/* Probe each address */
@ -152,7 +163,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
/* Set up data structures */
regaddr = 0;
regaddr = i2ctool->regaddr;
msg[0].frequency = i2ctool->freq;
msg[0].addr = addr;
@ -163,6 +174,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
msg[1].frequency = i2ctool->freq;
msg[1].addr = addr;
msg[1].flags = I2C_M_READ;
if (i2ctool->width == 8)
{
msg[1].buffer = &u.data8;
@ -202,5 +214,18 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
}
(void)close(fd);
errout:
/* Restore the previous "sticky" register address unless a new register
* address was provided on the command line. In that case the new
* register address is retained.
*/
if (i2ctool->regaddr == 0)
{
i2ctool->regaddr = saveaddr;
}
return OK;
}