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easy-connect/atmel-rf-driver/source/at24mac.cpp@0:a49e37a83a7a, 2019-04-15 (annotated)

Committer:
DuaaAbusharkh
Date:
Mon Apr 15 08:30:22 2019 +0000
Revision:
0:a49e37a83a7a
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DuaaAbusharkh 0:a49e37a83a7a 1 /*
DuaaAbusharkh 0:a49e37a83a7a 2 * Copyright (c) 2016-2016 ARM Limited. All rights reserved.
DuaaAbusharkh 0:a49e37a83a7a 3 * SPDX-License-Identifier: Apache-2.0
DuaaAbusharkh 0:a49e37a83a7a 4 * Licensed under the Apache License, Version 2.0 (the License); you may
DuaaAbusharkh 0:a49e37a83a7a 5 * not use this file except in compliance with the License.
DuaaAbusharkh 0:a49e37a83a7a 6 * You may obtain a copy of the License at
DuaaAbusharkh 0:a49e37a83a7a 7 *
DuaaAbusharkh 0:a49e37a83a7a 8 * http://www.apache.org/licenses/LICENSE-2.0
DuaaAbusharkh 0:a49e37a83a7a 9 *
DuaaAbusharkh 0:a49e37a83a7a 10 * Unless required by applicable law or agreed to in writing, software
DuaaAbusharkh 0:a49e37a83a7a 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
DuaaAbusharkh 0:a49e37a83a7a 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
DuaaAbusharkh 0:a49e37a83a7a 13 * See the License for the specific language governing permissions and
DuaaAbusharkh 0:a49e37a83a7a 14 * limitations under the License.
DuaaAbusharkh 0:a49e37a83a7a 15 */
DuaaAbusharkh 0:a49e37a83a7a 16 #include "at24mac.h"
DuaaAbusharkh 0:a49e37a83a7a 17
DuaaAbusharkh 0:a49e37a83a7a 18 /* Device addressing */
DuaaAbusharkh 0:a49e37a83a7a 19 #define AT24MAC_EEPROM_ADDRESS (0x0A<<4)
DuaaAbusharkh 0:a49e37a83a7a 20 #define AT24MAC_RW_PROTECT_ADDRESS (0x06<<4)
DuaaAbusharkh 0:a49e37a83a7a 21 #define AT24MAC_SERIAL_ADDRESS (0x0B<<4)
DuaaAbusharkh 0:a49e37a83a7a 22
DuaaAbusharkh 0:a49e37a83a7a 23 /* Known memory blocks */
DuaaAbusharkh 0:a49e37a83a7a 24 #define AT24MAC_SERIAL_OFFSET (0x80)
DuaaAbusharkh 0:a49e37a83a7a 25 #define AT24MAC_EUI64_OFFSET (0x98)
DuaaAbusharkh 0:a49e37a83a7a 26 #define AT24MAC_EUI48_OFFSET (0x9A)
DuaaAbusharkh 0:a49e37a83a7a 27
DuaaAbusharkh 0:a49e37a83a7a 28 #define SERIAL_LEN 16
DuaaAbusharkh 0:a49e37a83a7a 29 #define EUI64_LEN 8
DuaaAbusharkh 0:a49e37a83a7a 30 #define EUI48_LEN 6
DuaaAbusharkh 0:a49e37a83a7a 31
DuaaAbusharkh 0:a49e37a83a7a 32 AT24Mac::I2CReset::I2CReset(PinName sda, PinName scl)
DuaaAbusharkh 0:a49e37a83a7a 33 {
DuaaAbusharkh 0:a49e37a83a7a 34 mbed::DigitalInOut SDA(sda, PIN_OUTPUT, PullUp, 1);
DuaaAbusharkh 0:a49e37a83a7a 35 mbed::DigitalInOut SCL(scl, PIN_OUTPUT, PullUp, 0);
DuaaAbusharkh 0:a49e37a83a7a 36 //generate 9 clocks for worst-case scenario
DuaaAbusharkh 0:a49e37a83a7a 37 for (int i = 0; i < 10; ++i) {
DuaaAbusharkh 0:a49e37a83a7a 38 SCL = 1;
DuaaAbusharkh 0:a49e37a83a7a 39 wait_us(5);
DuaaAbusharkh 0:a49e37a83a7a 40 SCL = 0;
DuaaAbusharkh 0:a49e37a83a7a 41 wait_us(5);
DuaaAbusharkh 0:a49e37a83a7a 42 }
DuaaAbusharkh 0:a49e37a83a7a 43 //generate a STOP condition
DuaaAbusharkh 0:a49e37a83a7a 44 SDA = 0;
DuaaAbusharkh 0:a49e37a83a7a 45 wait_us(5);
DuaaAbusharkh 0:a49e37a83a7a 46 SCL = 1;
DuaaAbusharkh 0:a49e37a83a7a 47 wait_us(5);
DuaaAbusharkh 0:a49e37a83a7a 48 SDA = 1;
DuaaAbusharkh 0:a49e37a83a7a 49 wait_us(5);
DuaaAbusharkh 0:a49e37a83a7a 50 }
DuaaAbusharkh 0:a49e37a83a7a 51
DuaaAbusharkh 0:a49e37a83a7a 52 /*I2C needs to be reset before constructing the I2C object (in case I2C is stuck)
DuaaAbusharkh 0:a49e37a83a7a 53 because they use the same pins, therefore i2c_reset has to be before _i2c
DuaaAbusharkh 0:a49e37a83a7a 54 in the initializer list*/
DuaaAbusharkh 0:a49e37a83a7a 55 AT24Mac::AT24Mac(PinName sda, PinName scl) : i2c_reset(sda, scl), _i2c(sda, scl)
DuaaAbusharkh 0:a49e37a83a7a 56 {
DuaaAbusharkh 0:a49e37a83a7a 57 // Do nothing
DuaaAbusharkh 0:a49e37a83a7a 58 }
DuaaAbusharkh 0:a49e37a83a7a 59
DuaaAbusharkh 0:a49e37a83a7a 60 int AT24Mac::read_serial(void *buf)
DuaaAbusharkh 0:a49e37a83a7a 61 {
DuaaAbusharkh 0:a49e37a83a7a 62 char offset = AT24MAC_SERIAL_OFFSET;
DuaaAbusharkh 0:a49e37a83a7a 63 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
DuaaAbusharkh 0:a49e37a83a7a 64 return -1; //No ACK
DuaaAbusharkh 0:a49e37a83a7a 65 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, SERIAL_LEN);
DuaaAbusharkh 0:a49e37a83a7a 66 }
DuaaAbusharkh 0:a49e37a83a7a 67
DuaaAbusharkh 0:a49e37a83a7a 68 int AT24Mac::read_eui64(void *buf)
DuaaAbusharkh 0:a49e37a83a7a 69 {
DuaaAbusharkh 0:a49e37a83a7a 70 char offset = AT24MAC_EUI64_OFFSET;
DuaaAbusharkh 0:a49e37a83a7a 71 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
DuaaAbusharkh 0:a49e37a83a7a 72 return -1; //No ACK
DuaaAbusharkh 0:a49e37a83a7a 73 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI64_LEN);
DuaaAbusharkh 0:a49e37a83a7a 74 }
DuaaAbusharkh 0:a49e37a83a7a 75
DuaaAbusharkh 0:a49e37a83a7a 76 int AT24Mac::read_eui48(void *buf)
DuaaAbusharkh 0:a49e37a83a7a 77 {
DuaaAbusharkh 0:a49e37a83a7a 78 char offset = AT24MAC_EUI48_OFFSET;
DuaaAbusharkh 0:a49e37a83a7a 79 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
DuaaAbusharkh 0:a49e37a83a7a 80 return -1; //No ACK
DuaaAbusharkh 0:a49e37a83a7a 81 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI48_LEN);
DuaaAbusharkh 0:a49e37a83a7a 82 }