diff options
Diffstat (limited to 'nuttx/configs/dk-tm4c129x/README.txt')
| -rw-r--r-- | nuttx/configs/dk-tm4c129x/README.txt | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/nuttx/configs/dk-tm4c129x/README.txt b/nuttx/configs/dk-tm4c129x/README.txt index 720a522bf..017bf0e6f 100644 --- a/nuttx/configs/dk-tm4c129x/README.txt +++ b/nuttx/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". |