Revision 1:4d19097c0571, committed 2017-09-14

Comitter:

ninensei

Date:

Thu Sep 14 00:20:01 2017 +0000

Parent:

0:905d325977dc

Child:

2:31aceaca418e

Commit message:

Converted to template so that I2C driver derivations can be used (I2C, SoftI2C, etc...); Changed filename to match class name.

Changed in this revision

--- a/pca9544a.h	Tue Sep 12 17:16:49 2017 +0000
+++ b/pca9544a.h	Thu Sep 14 00:20:01 2017 +0000
@@ -1,8 +1,58 @@
-// NXP PCA9544A: 8-channel I2C switch with reset
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 AT&T, IIoT Foundry, Plano, TX, USA
+ *
+ * Licensed 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.
+ */
+
+/** \addtogroup drivers */
+
+/** Support for the NXP PCA9544A 4-channel I2C switch.
+ *
+ * Example:
+ * @code
+ *
+ * #include "mbed.h"
+ * #include "PCA9544A.h"
+ *
+ * // PCA9544A strapped for address option 0 (7-bit I2C address 0x70)
+ *
+ * I2C            i2c(I2C_SDA, I2C_SCL);
+ * PCA9544A<I2C>  pca9544a(&i2c, 0);
+ *
+ * int main() {
+ *     bool                ok;
+ *
+ *     // Enable channel 1
+ *     bool ok = _pca9544a->select_channel(1);
+ *     if (ok) {
+ *         printf("I2C device on channel 1 is now accessible\r\n);
+ *     } else {
+ *         printf("pca9544a error!\r\n");
+ *     }
+ *
+ *     // Disconnect all downstream devices from the I2C bus
+ *     _pca9544a->reset();
+ * }
+ * @endcode
+ * @ingroup drivers
+ */
+
+#pragma once
 
 #define PCA9544A_BASE_ADDR_7BIT     0x70
 #define MAX_CHANNELS                4
 
+template <class T>
 class PCA9544A
 {
 public:
@@ -13,7 +63,7 @@
     * @param addr_3bit address of the multiplexer (A0-A2 pin strapping)
     *          Valid values are 0-7
     */
-    PCA9544A(I2C * i2c, uint8_t addr_3bit) : _i2c(i2c) {
+    PCA9544A(T * i2c, uint8_t addr_3bit) : _i2c(i2c) {
         _addr_8bit = ((addr_3bit & 0x7) + PCA9544A_BASE_ADDR_7BIT) << 1;
     }
 
@@ -47,6 +97,7 @@
     }
 
 protected:
-    int             _addr_8bit;
-    I2C *           _i2c;
+    int     _addr_8bit;
+    T      *_i2c;
 };
+