boards/esp32c3-devkit: Add support for BMP180 sensor

boards/risc-v/esp32c3/esp32c3-devkit/src/Makefile

@@ -42,6 +42,10 @@ ifeq ($(CONFIG_I2C_DRIVER),y)
 CSRCS += esp32c3_i2c.c
 endif
 
+ifeq ($(CONFIG_SENSORS_BMP180),y)
+CSRCS += esp32c3_bmp180.c
+endif
+
 ifeq ($(CONFIG_WATCHDOG),y)
 CSRCS += esp32c3_wdt.c
 endif

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3-devkit.h

@@ -116,5 +116,24 @@ int board_i2c_init(void);
 int board_tim_init(void);
 #endif
 
+/****************************************************************************
+ * Name: board_bmp180_initialize
+ *
+ * Description:
+ *   Initialize and register the BMP180 Pressure Sensor driver.
+ *
+ * Input Parameters:
+ *   devno - The device number, used to build the device path as /dev/pressN
+ *   busno - The I2C bus number
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SENSORS_BMP180
+int board_bmp180_initialize(int devno, int busno);
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* __BOARDS_RISCV_ESP32C3_ESP32C3_DEVKIT_SRC_ESP32C3_DEVKIT_H */

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_bmp180.c

@@ -0,0 +1,109 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_bmp180.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/sensors/bmp180.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#include "esp32c3_i2c.h"
+#include "esp32c3-devkit.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_bmp180_initialize
+ *
+ * Description:
+ *   Initialize and register the BMP180 Pressure Sensor driver.
+ *
+ * Input Parameters:
+ *   devno - The device number, used to build the device path as /dev/pressN
+ *   busno - The I2C bus number
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_bmp180_initialize(int devno, int busno)
+{
+  struct i2c_master_s *i2c;
+  char devpath[12];
+  int ret;
+
+  sninfo("Initializing BMP180!\n");
+
+  /* Initialize BMP180 */
+
+  i2c = esp32c3_i2cbus_initialize(busno);
+
+  if (i2c)
+    {
+      /* Then try to register the barometer sensor in I2C0 */
+
+      snprintf(devpath, 12, "/dev/press%d", devno);
+      ret = bmp180_register(devpath, i2c);
+      if (ret < 0)
+        {
+          snerr("ERROR: Error registering BMP180 in I2C%d\n", busno);
+        }
+    }
+  else
+    {
+      ret = -ENODEV;
+    }
+
+  return ret;
+}
+

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_bringup.c

@@ -106,6 +106,19 @@ int esp32c3_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_SENSORS_BMP180
+  /* Try to register BMP180 device in I2C0 */
+
+  ret = board_bmp180_initialize(0, 0);
+
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "Failed to initialize BMP180 "
+                       "Driver for I2C0: %d\n", ret);
+      return ret;
+    }
+#endif
+
 #ifdef CONFIG_WATCHDOG
   /* Configure watchdog timer */