board/stm32f401rc-rs485: Add support to LM75 sensor

Documentation/platforms/arm/stm32f4/boards/stm32f401rc-rs485/index.rst

@@ -155,7 +155,7 @@ Users can enable EERPOM support on STM32F4-RS485 by following below configuratio
 Temperature Sensor
 ==================
 
-The STM32F4-RS485 development board has a temperature sensor TMP75 (TMP75AIDR) connected through I2C as below:
+The STM32F4-RS485 development board has a temperature sensor TMP75 (compatible with LM75) connected through I2C as below:
 
 ====== =====
 I2C    PINS
@@ -401,3 +401,18 @@ The application modbusmaster will send 100 requests, you can check on diagslave:
        Slave  10: readHoldingRegisters from 2, 1 references
        Slave  10: readHoldingRegisters from 2, 1 references
        Slave  10: readHoldingRegisters from 2, 1 references
+
+lm75
+----
+
+Configures the NuttShell (nsh) over USB Serial (check usbserial configuration) and enables temperature sensor LM75.
+NSH commands::
+
+       nsh> lm75 -help
+       Usage: temp [OPTIONS]
+         [-n count] selects the samples to collect.  Default: 1 Current: 100
+         [-h] shows this message and exits
+       nsh> lm75 -n 3
+       30.13 degrees Celsius
+       30.13 degrees Celsius
+       30.13 degrees Celsius

boards/arm/stm32/stm32f401rc-rs485/configs/lm75/defconfig

@@ -0,0 +1,73 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_FPU is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="stm32f401rc-rs485"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_STM32F401RC_RS485=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="stm32"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32F401RC=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_USBDEVCTRL=y
+CONFIG_BOARD_LOOPSPERMSEC=8499
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_EXAMPLES_BUTTONS=y
+CONFIG_EXAMPLES_BUTTONS_NAME0="SW3"
+CONFIG_EXAMPLES_BUTTONS_NAME1="SW4"
+CONFIG_EXAMPLES_BUTTONS_NAME2="SW5"
+CONFIG_EXAMPLES_BUTTONS_NAMES=y
+CONFIG_EXAMPLES_BUTTONS_QTD=3
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_I2CTOOL_MAXBUS=1
+CONFIG_I2CTOOL_MINBUS=1
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INPUT=y
+CONFIG_INPUT_BUTTONS=y
+CONFIG_INPUT_BUTTONS_LOWER=y
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_FLOATINGPOINT=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=98304
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SENSORS=y
+CONFIG_SENSORS_LM75=y
+CONFIG_SPI=y
+CONFIG_START_DAY=5
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2014
+CONFIG_STM32_I2C1=y
+CONFIG_STM32_JTAG_SW_ENABLE=y
+CONFIG_STM32_OTGFS=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART6=y
+CONFIG_SYSTEM_I2CTOOL=y
+CONFIG_SYSTEM_LM75=y
+CONFIG_SYSTEM_LM75_CELSIUS=y
+CONFIG_SYSTEM_LM75_DEVNAME="/dev/temp0"
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USBDEV=y

boards/arm/stm32/stm32f401rc-rs485/src/stm32_bringup.c

@@ -47,6 +47,10 @@
 
 #include <nuttx/board.h>
 
+#ifdef CONFIG_SENSORS_LM75
+#include "stm32_lm75.h"
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -145,6 +149,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_LM75_I2C
+  /* Configure and initialize the LM75 sensor */
+
+  ret = board_lm75_initialize(0, 1);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: board_lm75_initialize() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_INPUT_BUTTONS
   /* Register the BUTTON driver */