[GitHub] [incubator-nuttx] acassis commented on a change in pull request #5376: i2c: Add TCA9548A I2C Multiplexer

[GitBox <gi...@apache.org>]

acassis commented on a change in pull request #5376:
URL: https://github.com/apache/incubator-nuttx/pull/5376#discussion_r795188253



##########
File path: boards/xtensa/esp32/common/src/esp32_tca9548a.c
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@@ -0,0 +1,145 @@
+/****************************************************************************
+ * boards/xtensa/esp32/common/src/esp32_tca9548a.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 <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/i2c/i2c_master.h>
+#include <nuttx/i2c/tca9548a.h>
+
+#include "esp32_board_i2c.h"
+#include "esp32_i2c.h"
+#include "esp32_tca9548a.h"
+
+FAR struct tca9548a_dev_s *g_tca9448a_devs[8] =
+                                                {
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL,
+                                                  NULL
+                                                };
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_tca9548a_initialize
+ *
+ * Description:
+ *   Initialize and register the TCA9548A 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_tca9548a_initialize(int devno, int busno)
+{
+  struct i2c_master_s *i2c;
+  uint8_t addr;
+
+  i2cinfo("Initializing TCA9548A!\n");
+
+  /* TCA9548A valid addresses are 0:0x70 - 7:0x77 */
+
+  if (devno < TCA9548A_SEL_CH0 && devno > TCA9548A_SEL_CH8)

Review comment:
       Thank you!




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