Diff: atmel-rf-driver/source/at24mac.cpp

Revision:

0:615f90842ce8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/atmel-rf-driver/source/at24mac.cpp	Wed Jul 12 10:52:58 2017 +0000
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2016-2016 ARM Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ * 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.
+ */
+#include "at24mac.h"
+
+/* Device addressing */
+#define AT24MAC_EEPROM_ADDRESS		(0x0A<<4)
+#define AT24MAC_RW_PROTECT_ADDRESS	(0x06<<4)
+#define AT24MAC_SERIAL_ADDRESS		(0x0B<<4)
+
+/* Known memory blocks */
+#define AT24MAC_SERIAL_OFFSET	(0x80)
+#define AT24MAC_EUI64_OFFSET	(0x98)
+#define AT24MAC_EUI48_OFFSET	(0x9A)
+
+#define SERIAL_LEN 16
+#define EUI64_LEN 8
+#define EUI48_LEN 6
+
+AT24Mac::I2CReset::I2CReset(PinName sda, PinName scl)
+{
+    mbed::DigitalInOut SDA(sda, PIN_OUTPUT, PullUp, 1);
+    mbed::DigitalInOut SCL(scl, PIN_OUTPUT, PullUp, 0);
+    //generate 9 clocks for worst-case scenario
+    for (int i = 0; i < 10; ++i) {
+        SCL = 1;
+        wait_us(5);
+        SCL = 0;
+        wait_us(5);
+    }
+    //generate a STOP condition
+    SDA = 0;
+    wait_us(5);
+    SCL = 1;
+    wait_us(5);
+    SDA = 1;
+    wait_us(5);
+}
+
+/*I2C needs to be reset before constructing the I2C object (in case I2C is stuck)
+  because they use the same pins, therefore i2c_reset has to be before _i2c
+  in the initializer list*/
+AT24Mac::AT24Mac(PinName sda, PinName scl) : i2c_reset(sda, scl), _i2c(sda, scl)
+{
+    // Do nothing
+}
+
+int AT24Mac::read_serial(void *buf)
+{
+    char offset = AT24MAC_SERIAL_OFFSET;
+    if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
+        return -1; //No ACK
+    return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, SERIAL_LEN);
+}
+
+int AT24Mac::read_eui64(void *buf)
+{
+    char offset = AT24MAC_EUI64_OFFSET;
+    if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
+        return -1; //No ACK
+    return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI64_LEN);
+}
+
+int AT24Mac::read_eui48(void *buf)
+{
+    char offset = AT24MAC_EUI48_OFFSET;
+    if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
+        return -1; //No ACK
+    return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI48_LEN);
+}