configs/stm32f4discovery/: Add support to BMP180 driver on STM32F4Discovery. From Alan Carvalho de Assis.

configs/stm32f4discovery/include/board.h

@@ -274,6 +274,11 @@
 #define GPIO_SPI1_MOSI GPIO_SPI1_MOSI_1
 #define GPIO_SPI1_SCK  GPIO_SPI1_SCK_1
 
+/* I2C config to use with Nunchuk PB7 (SDA) and PB8 (SCL) */
+
+#define GPIO_I2C1_SCL  GPIO_I2C1_SCL_2
+#define GPIO_I2C1_SDA  GPIO_I2C1_SDA_1
+
 /* Timer Inputs/Outputs (see the README.txt file for options) */
 
 #define GPIO_TIM2_CH1IN  GPIO_TIM2_CH1IN_2

configs/stm32f4discovery/src/Makefile

@@ -56,6 +56,10 @@ ifeq ($(CONFIG_STM32_OTGFS),y)
 CSRCS += stm32_usb.c
 endif
 
+ifeq ($(CONFIG_BMP180),y)
+CSRCS += stm32_bmp180.c
+endif
+
 ifeq ($(CONFIG_STM32_SDIO),y)
 CSRCS += stm32_sdio.c
 endif

configs/stm32f4discovery/src/stm32_bmp180.c

@@ -0,0 +1,104 @@
+/************************************************************************************
+ * configs/stm32f4discovery/src/stm32_bmp180.c
+ *
+ *   Copyright (C) 2015 Alan Carvalho de Assis. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.com>
+ *
+ * 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 <debug.h>
+
+#include <nuttx/spi/spi.h>
+#include <nuttx/sensors/bmp180.h>
+
+#include "stm32.h"
+#include "stm32f4discovery.h"
+
+#if defined(CONFIG_I2C) && defined(CONFIG_BMP180)
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#define MPL115A_I2C_PORTNO 1   /* On I2C1 */
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_bmp180initialize
+ *
+ * Description:
+ *   Initialize and register the MPL115A Pressure Sensor driver.
+ *
+ * Input parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/press0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ************************************************************************************/
+
+int stm32_bmp180initialize(FAR const char *devpath)
+{
+  FAR struct i2c_dev_s *i2c;
+  int ret;
+
+  sndbg("Initializing BMP180!\n");
+
+  /* Initialize I2C */
+
+  i2c = up_i2cinitialize(BMP180_I2C_PORTNO);
+
+  if (!i2c)
+    {
+      return -ENODEV;
+    }
+
+  /* Then register the barometer sensor */
+  
+  ret = bmp180_register(devpath, i2c);
+  if (ret < 0)
+    {
+      sndbg("Error registering BM180\n");
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_I2C && CONFIG_MPL115A && CONFIG_STM32_I2C1 */

configs/stm32f4discovery/src/stm32_nsh.c

@@ -66,6 +66,10 @@
 
 int board_app_initialize(void)
 {
+#ifdef CONFIG_BMP180
+  stm32_bmp180initialize("/dev/press0");
+#endif
+
 #ifdef CONFIG_BOARD_INITIALIZE
   /* Board initialization already performed by board_initialize() */
 

configs/stm32f4discovery/src/stm32f4discovery.h

@@ -281,6 +281,19 @@
 
 void weak_function stm32_spiinitialize(void);
 
+/****************************************************************************
+ * Name: stm32_bmp180initialize
+ *
+ * Description:
+ *   Called to configure an I2C and to register BMP180 for the stm32f4discovery
+ *   board.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_BMP180
+int stm32_bmp180initialize(FAR const char *devpath);
+#endif
+
 /****************************************************************************
  * Name: stm32_bringup
  *