DK-TM4C129X: Add logic to initialize the TMP-100 temperature sensor driver at startup

configs/dk-tm4c129x/README.txt

@@ -652,6 +652,8 @@ f Application Configuration -> Network Utilities
 Temperature Sensor
 ==================
 
+  TMP-1000 Temperature Sensor Driver
+  ----------------------------------
   Support for the on-board TMP-100 temperature sensor is available.  This
   uses the driver for the compatible LM-75 part.  To set up the temperature
   sensor, add the following to the NuttX configuration file:
@@ -663,8 +665,12 @@ Temperature Sensor
       CONFIG_I2C=y
 
     Drivers -> Sensors
+      CONFIG_LM75=y
       CONFIG_I2C_LM75=y
 
+    Applications -> NSH Library
+      CONFIG_NSH_ARCHINIT=y
+
   Then you can implement logic like the following to use the temperature sensor:
 
     #include <nuttx/sensors/lm75.h>
@@ -673,13 +679,35 @@ Temperature Sensor
     ret = tiva_tmp100_initialize("/dev/temp");      /* Register the temperature sensor */
     fd  = open("/dev/temp", O_RDONLY);              /* Open the temperature sensor device */
     ret = ioctl(fd, SNIOC_FAHRENHEIT, 0);           /* Select Fahrenheit */
-    bytesread = read(fd, buffer, 8*sizeof(b16_t));  /* Read temperature samples */
+    bytesread = read(fd, buffer, 8*sizeof(b16_t));  /* Read (8) temperature samples */
 
   More complex temperature sensor operations are also available.  See the IOCTL
   commands enumerated in include/nuttx/sensors/lm75.h.  Also read the descriptions
   of the tiva_tmp100_initialize() and tiva_tmp100_attach() interfaces in the
   arch/board/board.h file (sames as configs/dk-tm4c129x/include/board.h).
 
+  NSH Command Line Application
+  ----------------------------
+  There is a tiny NSH command line application at examples/system/lm75 that
+  will read the current temperature from an LM75 compatible temperature sensor
+  and print the temperature on stdout in either units of degrees Fahrenheit or
+  Centigrade.  This tiny command line application is enabled with the following
+  configuratin options:
+
+    Library
+      CONFIG_LIBM=y
+      CONFIG_LIBC_FLOATINGPOINT=y
+
+    Applications -> NSH Library
+      CONFIG_NSH_ARCHINIT=y
+
+    Applications -> System Add-Ons
+      CONFIG_SYSTEM_LM75=y
+      CONFIG_SYSTEM_LM75_DEVNAME="/dev/temp"
+      CONFIG_SYSTEM_LM75_FAHRENHEIT=y  (or CENTIGRADE)
+      CONFIG_SYSTEM_LM75_STACKSIZE=1024
+      CONFIG_SYSTEM_LM75_PRIORITY=100
+
 DK-TM4129X Configuration Options
 ================================
 
@@ -868,3 +896,16 @@ Where <subdir> is one of the following:
        network back up when the link becomes available again (for example,
        if the cable is reconnected.  The paragraph "Network Monitor" above
        for additional information.
+
+    5. I2C6 and support for the on-board TMP-100 temperature sensor are
+       enabled.  Also enabled is the NSH 'temp' command that will show the
+       current temperature on the command line like:
+
+       nsh> temp
+       80.60 degrees Fahrenheit
+
+       [80.6 F in January.  I love living in Costa Rica1]
+
+       The default units is degrees Fahrenheit, but that is easily
+       reconfigured.  See the discussin above in the paragraph entitled
+       "Temperature Sensor".

configs/dk-tm4c129x/include/board.h

@@ -273,7 +273,7 @@ void tiva_setleds(uint8_t ledset);
  *
  ************************************************************************************/
 
-#if defined(CONFIG_I2C) && defined(CONFIG_I2C_LM75) && defined(CONFIG_STM32_I2C1)
+#if defined(CONFIG_I2C) && defined(CONFIG_I2C_LM75) && defined(CONFIG_TIVA_I2C6)
 int tiva_tmp100_initialize(FAR const char *devpath);
 #endif
 

configs/dk-tm4c129x/src/Makefile

@@ -60,8 +60,10 @@ CSRCS += tm4c_nsh.c
 endif
 
 ifeq ($(CONFIG_I2C_LM75),y)
+ifeq ($(CONFIG_TIVA_I2C6),y)
 CSRCS += tm4c_tmp100.c
 endif
+endif
 
 COBJS = $(CSRCS:.c=$(OBJEXT))
 

configs/dk-tm4c129x/src/tm4c_bringup.c

@@ -39,7 +39,9 @@
 
 #include <nuttx/config.h>
 
-#include <syslog.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
 
 #include "dk-tm4c129x.h"
 
@@ -47,6 +49,11 @@
  * Pre-Processor Definitions
  ****************************************************************************/
 
+#ifdef CONFIG_SYSTEM_LM75_DEVNAME
+#  define TMP100_DEVNAME CONFIG_SYSTEM_LM75_DEVNAME
+#else
+#  define TMP100_DEVNAME "/dev/temp"
+#endif
 
 /****************************************************************************
  * Public Functions
@@ -62,5 +69,17 @@
 
 int tm4c_bringup(void)
 {
+#if defined(CONFIG_I2C) && defined(CONFIG_I2C_LM75) && defined(CONFIG_TIVA_I2C6)
+  int ret;
+
+  /* Initialize and register the TMP-100 Temperature Sensor driver. */
+
+  ret = tiva_tmp100_initialize(TMP100_DEVNAME);
+  if (ret < 0)
+    {
+      dbg("ERROR: Failed to initialize TMP100 driver: %d\n", ret);
+    }
+#endif
+
   return OK;
 }