configs/stm32f103-minimum: Add support for LM75 in the stm32f103-minimum board

configs/stm32f103-minimum/src/Makefile

@@ -69,6 +69,10 @@ ifeq ($(CONFIG_LEDS_APA102),y)
   CSRCS += stm32_apa102.c
 endif
 
+ifeq ($(CONFIG_LM75_I2C),y)
+  CSRCS += stm32_lm75.c
+endif
+
 ifeq ($(CONFIG_RGBLED),y)
   CSRCS += stm32_rgbled.c
 endif

configs/stm32f103-minimum/src/stm32_bringup.c

@@ -204,6 +204,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_LM75_I2C
+  /* Configure and initialize the LM75 sensor */
+
+  ret = stm32_lm75initialize("/dev/temp");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_lm75initialize() failed: %d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_RGBLED
   /* Configure and initialize the RGB LED. */
 

configs/stm32f103-minimum/src/stm32_lm75.c

@@ -0,0 +1,123 @@
+/************************************************************************************
+ * configs/stm32f103-minimum/src/stm32_lm75.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+
+#include <nuttx/i2c/i2c_master.h>
+#include <nuttx/sensors/lm75.h>
+
+#include "stm32.h"
+#include "stm32_i2c.h"
+#include "stm32f103_minimum.h"
+
+#if defined(CONFIG_I2C) && defined(CONFIG_LM75_I2C) && defined(CONFIG_STM32_I2C1)
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_lm75initialize
+ *
+ * Description:
+ *   Initialize and register the LM-75 Temperature Sensor driver.
+ *
+ * Input parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/temp0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ************************************************************************************/
+
+int stm32_lm75initialize(FAR const char *devpath)
+{
+  FAR struct i2c_master_s *i2c;
+  int ret;
+
+  /* Configure PB.5 as Input pull-up.  This pin can be used as a temperature
+   * sensor interrupt (not fully implemented).
+   */
+
+  stm32_configgpio(GPIO_LM75_OSINT);
+
+  /* Get an instance of the I2C1 interface */
+
+  i2c =  stm32_i2cbus_initialize(1);
+  if (!i2c)
+    {
+      return -ENODEV;
+    }
+
+  /* Then register the temperature sensor */
+
+  ret = lm75_register(devpath, i2c, 0x48);
+  if (ret < 0)
+    {
+      (void)stm32_i2cbus_uninitialize(i2c);
+    }
+
+  return ret;
+}
+
+/************************************************************************************
+ * Name: stm32_lm75attach
+ *
+ * Description:
+ *   Attach the LM-75 interrupt handler
+ *
+ * Input parameters:
+ *   irqhandler - the LM-75 interrupt handler
+ *   arg        - The argument that will accompany the interrupt
+ *
+ * Returned Value:
+ *   Zero (OK) returned on success; a negated errno value is returned on failure.
+ *
+ ************************************************************************************/
+
+int stm32_lm75attach(xcpt_t irqhandler, void *arg)
+{
+  (void)stm32_gpiosetevent(GPIO_LM75_OSINT, true, true, true, irqhandler, arg);
+  return OK;
+}
+
+#endif /* CONFIG_I2C && CONFIG_LM75_I2C && CONFIG_STM32_I2C1 */
+

configs/stm32f103-minimum/src/stm32f103_minimum.h

@@ -117,6 +117,10 @@
 #define STM32F103MINIMUM_PWMTIMER   3
 #define STM32F103MINIMUM_PWMCHANNEL 3
 
+/* LM-75 Temperature Sensor: PA.0 */
+
+#define GPIO_LM75_OSINT (GPIO_INPUT|GPIO_CNF_INFLOAT|GPIO_PORTA|GPIO_PIN0)
+
 /* nRF24 Configuration */
 
 /* NRF24L01 chip enable:  PB.1 */
@@ -219,6 +223,18 @@ void stm32_spidev_initialize(void);
 
 int stm32_hcsr04_initialize(FAR const char *devname);
 
+/************************************************************************************
+ * Name: stm32_lm75initialize
+ *
+ * Description:
+ *   Called to initialize LM75 temperature sensor
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_LM75_I2C
+int stm32_lm75initialize(FAR const char *devpath);
+#endif
+
 /************************************************************************************
  * Name: stm32_w25initialize
  *