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Merged in david_alessio/apps/bugfix/i2ctool-dev-clobbers-slave-config (pull request #198)

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Bugfix/i2ctool dev clobbers slave config

* friendlier I2C "knock-knock" uses only read request

    While many I2C slave devices have multiple indexed registers, some have
    only one register and it's not indexed.  For example, the I2C bus switch
    TCA9548A has only a Control Register, attempting to index to "Reg[0]"
    alters its contents to 0x00 disabling all subordinate buses.  This patch
    fixes that problem by simply trying to read something/anything from the
    slave.  This also helps coax out slaves with register files that start
    from a higher index, i.e. the AT24CS0x, FLASH chips with a UUID that
    appears as a 2nd I2C slave at (address+8), report their serial number at
    Reg[80]-Reg[8F] and will NAK a read of Reg[0].

* modify get/set to prevent write of reg index if not specifed

Approved-by: Gregory Nutt <gnutt@nuttx.org>
This commit is contained in:
David Alessio 2019-08-20 20:29:21 +00:00 committed by Gregory Nutt
parent 811086ff85
commit 839efa6669
6 changed files with 128 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
system/i2c/i2c_common.c
View File

@ -171,6 +171,7 @@ int i2ctool_common_args(FAR struct i2ctool_s *i2ctool, FAR char **arg)
}
i2ctool->regaddr = (uint8_t)value;
i2ctool->hasregindx = true;
return ret;
case 's':

47
system/i2c/i2c_dev.c
View File

@ -55,14 +55,8 @@
int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
{
struct i2c_msg_s msg[2];
struct i2c_msg_s msg;
FAR char *ptr;
union
{
uint16_t data16;
uint8_t data8;
} u;
uint8_t regaddr;
uint8_t saveaddr;
long first;
@ -165,39 +159,13 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
regaddr = i2ctool->regaddr;
msg[0].frequency = i2ctool->freq;
msg[0].addr = addr;
msg[0].flags = I2C_M_NOSTOP;
msg[0].buffer = &regaddr;
msg[0].length = 1;
msg.frequency = i2ctool->freq;
msg.addr = addr;
msg.flags = I2C_M_READ;
msg.buffer = &regaddr;
msg.length = 1;
msg[1].frequency = i2ctool->freq;
msg[1].addr = addr;
msg[1].flags = I2C_M_READ;
if (i2ctool->width == 8)
{
msg[1].buffer = &u.data8;
msg[1].length = 1;
}
else
{
msg[1].buffer = (uint8_t*)&u.data16;
msg[1].length = 2;
}
if (i2ctool->start)
{
ret = i2cdev_transfer(fd, &msg[0], 1);
if (ret == OK)
{
ret = i2cdev_transfer(fd, &msg[1], 1);
}
}
else
{
ret = i2cdev_transfer(fd, msg, 2);
}
ret = i2cdev_transfer(fd, &msg, 1);
if (ret == OK)
{
@ -207,6 +175,7 @@ int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
{
i2ctool_printf(i2ctool, "-- ");
}
i2ctool_flush(i2ctool);
}
i2ctool_printf(i2ctool, "\n");

26
system/i2c/i2c_get.c
View File

@ -182,6 +182,8 @@ int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
/* Set up data structures */
if (i2ctool->hasregindx)
{
msg[0].frequency = i2ctool->freq;
msg[0].addr = i2ctool->addr;
msg[0].flags = I2C_M_NOSTOP;
@ -215,6 +217,30 @@ int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
{
ret = i2cdev_transfer(fd, msg, 2);
}
}
else
{
/* no register index "-r" has been specified so
* we do a pure read (no write of index)
*/
msg[0].frequency = i2ctool->freq;
msg[0].addr = i2ctool->addr;
msg[0].flags = I2C_M_READ;
if (i2ctool->width == 8)
{
msg[0].buffer = &u.data8;
msg[0].length = 1;
}
else
{
msg[0].buffer = (uint8_t*)&u.data16;
msg[0].length = 2;
}
ret = i2cdev_transfer(fd, msg, 1);
}
/* Return the result of the read operation */

10
system/i2c/i2c_main.c
View File

@ -124,9 +124,6 @@ static int i2ccmd_help(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
i2ctool_printf(i2ctool, " [-b bus] is the I2C bus number (decimal). "
"Default: %d Current: %d\n",
CONFIG_I2CTOOL_MINBUS, i2ctool->bus);
i2ctool_printf(i2ctool, " [-r regaddr] is the I2C device register address (hex). "
"Default: 00 Current: %02x\n",
i2ctool->regaddr);
i2ctool_printf(i2ctool, " [-w width] is the data width (8 or 16 decimal). "
"Default: 8 Current: %d\n",
i2ctool->width);
@ -139,6 +136,11 @@ static int i2ccmd_help(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
i2ctool_printf(i2ctool, " [-f freq] I2C frequency. "
"Default: %d Current: %d\n",
CONFIG_I2CTOOL_DEFFREQ, i2ctool->freq);
i2ctool_printf(i2ctool, "\nSpecial non-sticky options:\n");
i2ctool_printf(i2ctool, " [-r regaddr] is the I2C device register index (hex). "
"Default: not used/sent\n");
i2ctool_printf(i2ctool, "\nNOTES:\n");
#ifndef CONFIG_DISABLE_ENVIRON
i2ctool_printf(i2ctool, "o An environment variable like $PATH may be used for any argument.\n");
@ -380,6 +382,8 @@ int i2c_main(int argc, char *argv[])
g_i2ctool.freq = CONFIG_I2CTOOL_DEFFREQ;
}
g_i2ctool.hasregindx = false;
/* Parse and process the command line */
i2c_setup(&g_i2ctool);

29
system/i2c/i2c_set.c
View File

@ -207,6 +207,9 @@ int i2ctool_set(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
} u;
int ret;
if (i2ctool->hasregindx)
{
/* Set up data structures */
msg[0].frequency = i2ctool->freq;
@ -245,6 +248,32 @@ int i2ctool_set(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
msg[1].flags |= I2C_M_NOSTART;
ret = i2cdev_transfer(fd, msg, 2);
}
}
else
{
/* no register index "-r" has been specified so
* we don't send a register index, just do the write
*/
msg[0].frequency = i2ctool->freq;
msg[0].addr = i2ctool->addr;
msg[0].flags = 0;
if (i2ctool->width == 8)
{
u.data8 = (uint8_t)value;
msg[0].buffer = &u.data8;
msg[0].length = 1;
}
else
{
u.data16 = value;
msg[0].buffer = (uint8_t*)&u.data16;
msg[0].length = 2;
}
ret = i2cdev_transfer(fd, msg, 1);
}
return ret;
}

3
system/i2c/i2ctool.h
View File

@ -140,6 +140,7 @@ struct i2ctool_s
uint8_t width; /* [-w width] is the data width (8 or 16) */
bool start; /* [-s|n], send|don't send start between command and data */
bool autoincr; /* [-i|j], Auto increment|don't increment regaddr on repititions */
bool hasregindx; /* true with the use of -r */
uint32_t freq; /* [-f freq] I2C frequency */
/* Output streams */
@ -192,7 +193,7 @@ int i2ccmd_verf(FAR struct i2ctool_s *i2ctool, int argc, FAR char **argv);
/* I2C access functions */
int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t addr,
int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
FAR uint16_t *result);
int i2ctool_set(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
uint16_t value);