Toyomasa Watarai / Mbed OS Mbed-example-WS-W27

Dependencies:   MMA7660 LM75B

easy-connect/atmel-rf-driver/source/at24mac.cpp@0:119624335925, 2018-06-30 (annotated)

Committer:
MACRUM
Date:
Sat Jun 30 01:40:30 2018 +0000
Revision:
0:119624335925
Initial commit

Who changed what in which revision?

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MACRUM 0:119624335925 1 /*
MACRUM 0:119624335925 2 * Copyright (c) 2016-2016 ARM Limited. All rights reserved.
MACRUM 0:119624335925 3 * SPDX-License-Identifier: Apache-2.0
MACRUM 0:119624335925 4 * Licensed under the Apache License, Version 2.0 (the License); you may
MACRUM 0:119624335925 5 * not use this file except in compliance with the License.
MACRUM 0:119624335925 6 * You may obtain a copy of the License at
MACRUM 0:119624335925 7 *
MACRUM 0:119624335925 8 * http://www.apache.org/licenses/LICENSE-2.0
MACRUM 0:119624335925 9 *
MACRUM 0:119624335925 10 * Unless required by applicable law or agreed to in writing, software
MACRUM 0:119624335925 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
MACRUM 0:119624335925 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MACRUM 0:119624335925 13 * See the License for the specific language governing permissions and
MACRUM 0:119624335925 14 * limitations under the License.
MACRUM 0:119624335925 15 */
MACRUM 0:119624335925 16 #include "at24mac.h"
MACRUM 0:119624335925 17
MACRUM 0:119624335925 18 /* Device addressing */
MACRUM 0:119624335925 19 #define AT24MAC_EEPROM_ADDRESS (0x0A<<4)
MACRUM 0:119624335925 20 #define AT24MAC_RW_PROTECT_ADDRESS (0x06<<4)
MACRUM 0:119624335925 21 #define AT24MAC_SERIAL_ADDRESS (0x0B<<4)
MACRUM 0:119624335925 22
MACRUM 0:119624335925 23 /* Known memory blocks */
MACRUM 0:119624335925 24 #define AT24MAC_SERIAL_OFFSET (0x80)
MACRUM 0:119624335925 25 #define AT24MAC_EUI64_OFFSET (0x98)
MACRUM 0:119624335925 26 #define AT24MAC_EUI48_OFFSET (0x9A)
MACRUM 0:119624335925 27
MACRUM 0:119624335925 28 #define SERIAL_LEN 16
MACRUM 0:119624335925 29 #define EUI64_LEN 8
MACRUM 0:119624335925 30 #define EUI48_LEN 6
MACRUM 0:119624335925 31
MACRUM 0:119624335925 32 AT24Mac::I2CReset::I2CReset(PinName sda, PinName scl)
MACRUM 0:119624335925 33 {
MACRUM 0:119624335925 34 mbed::DigitalInOut SDA(sda, PIN_OUTPUT, PullUp, 1);
MACRUM 0:119624335925 35 mbed::DigitalInOut SCL(scl, PIN_OUTPUT, PullUp, 0);
MACRUM 0:119624335925 36 //generate 9 clocks for worst-case scenario
MACRUM 0:119624335925 37 for (int i = 0; i < 10; ++i) {
MACRUM 0:119624335925 38 SCL = 1;
MACRUM 0:119624335925 39 wait_us(5);
MACRUM 0:119624335925 40 SCL = 0;
MACRUM 0:119624335925 41 wait_us(5);
MACRUM 0:119624335925 42 }
MACRUM 0:119624335925 43 //generate a STOP condition
MACRUM 0:119624335925 44 SDA = 0;
MACRUM 0:119624335925 45 wait_us(5);
MACRUM 0:119624335925 46 SCL = 1;
MACRUM 0:119624335925 47 wait_us(5);
MACRUM 0:119624335925 48 SDA = 1;
MACRUM 0:119624335925 49 wait_us(5);
MACRUM 0:119624335925 50 }
MACRUM 0:119624335925 51
MACRUM 0:119624335925 52 /*I2C needs to be reset before constructing the I2C object (in case I2C is stuck)
MACRUM 0:119624335925 53 because they use the same pins, therefore i2c_reset has to be before _i2c
MACRUM 0:119624335925 54 in the initializer list*/
MACRUM 0:119624335925 55 AT24Mac::AT24Mac(PinName sda, PinName scl) : i2c_reset(sda, scl), _i2c(sda, scl)
MACRUM 0:119624335925 56 {
MACRUM 0:119624335925 57 // Do nothing
MACRUM 0:119624335925 58 }
MACRUM 0:119624335925 59
MACRUM 0:119624335925 60 int AT24Mac::read_serial(void *buf)
MACRUM 0:119624335925 61 {
MACRUM 0:119624335925 62 char offset = AT24MAC_SERIAL_OFFSET;
MACRUM 0:119624335925 63 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
MACRUM 0:119624335925 64 return -1; //No ACK
MACRUM 0:119624335925 65 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, SERIAL_LEN);
MACRUM 0:119624335925 66 }
MACRUM 0:119624335925 67
MACRUM 0:119624335925 68 int AT24Mac::read_eui64(void *buf)
MACRUM 0:119624335925 69 {
MACRUM 0:119624335925 70 char offset = AT24MAC_EUI64_OFFSET;
MACRUM 0:119624335925 71 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
MACRUM 0:119624335925 72 return -1; //No ACK
MACRUM 0:119624335925 73 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI64_LEN);
MACRUM 0:119624335925 74 }
MACRUM 0:119624335925 75
MACRUM 0:119624335925 76 int AT24Mac::read_eui48(void *buf)
MACRUM 0:119624335925 77 {
MACRUM 0:119624335925 78 char offset = AT24MAC_EUI48_OFFSET;
MACRUM 0:119624335925 79 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
MACRUM 0:119624335925 80 return -1; //No ACK
MACRUM 0:119624335925 81 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI48_LEN);
MACRUM 0:119624335925 82 }