u-blox / easy-connect

Version of easy-connect with the u-blox cellular platforms C027 and C030 added.

Dependents:   HelloMQTT

atmel-rf-driver/source/at24mac.cpp@6:304d3ba87a01, 2017-11-03 (annotated)

Committer:
RobMeades
Date:
Fri Nov 03 13:01:23 2017 +0000
Revision:
6:304d3ba87a01
Parent:
0:19aa55d66228 
Add comment concerning N2XX baud rate.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-ublox 0:19aa55d66228 1 /*
group-ublox 0:19aa55d66228 2 * Copyright (c) 2016-2016 ARM Limited. All rights reserved.
group-ublox 0:19aa55d66228 3 * SPDX-License-Identifier: Apache-2.0
group-ublox 0:19aa55d66228 4 * Licensed under the Apache License, Version 2.0 (the License); you may
group-ublox 0:19aa55d66228 5 * not use this file except in compliance with the License.
group-ublox 0:19aa55d66228 6 * You may obtain a copy of the License at
group-ublox 0:19aa55d66228 7 *
group-ublox 0:19aa55d66228 8 * http://www.apache.org/licenses/LICENSE-2.0
group-ublox 0:19aa55d66228 9 *
group-ublox 0:19aa55d66228 10 * Unless required by applicable law or agreed to in writing, software
group-ublox 0:19aa55d66228 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
group-ublox 0:19aa55d66228 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-ublox 0:19aa55d66228 13 * See the License for the specific language governing permissions and
group-ublox 0:19aa55d66228 14 * limitations under the License.
group-ublox 0:19aa55d66228 15 */
group-ublox 0:19aa55d66228 16 #include "at24mac.h"
group-ublox 0:19aa55d66228 17
group-ublox 0:19aa55d66228 18 /* Device addressing */
group-ublox 0:19aa55d66228 19 #define AT24MAC_EEPROM_ADDRESS (0x0A<<4)
group-ublox 0:19aa55d66228 20 #define AT24MAC_RW_PROTECT_ADDRESS (0x06<<4)
group-ublox 0:19aa55d66228 21 #define AT24MAC_SERIAL_ADDRESS (0x0B<<4)
group-ublox 0:19aa55d66228 22
group-ublox 0:19aa55d66228 23 /* Known memory blocks */
group-ublox 0:19aa55d66228 24 #define AT24MAC_SERIAL_OFFSET (0x80)
group-ublox 0:19aa55d66228 25 #define AT24MAC_EUI64_OFFSET (0x98)
group-ublox 0:19aa55d66228 26 #define AT24MAC_EUI48_OFFSET (0x9A)
group-ublox 0:19aa55d66228 27
group-ublox 0:19aa55d66228 28 #define SERIAL_LEN 16
group-ublox 0:19aa55d66228 29 #define EUI64_LEN 8
group-ublox 0:19aa55d66228 30 #define EUI48_LEN 6
group-ublox 0:19aa55d66228 31
group-ublox 0:19aa55d66228 32 AT24Mac::I2CReset::I2CReset(PinName sda, PinName scl)
group-ublox 0:19aa55d66228 33 {
group-ublox 0:19aa55d66228 34 mbed::DigitalInOut SDA(sda, PIN_OUTPUT, PullUp, 1);
group-ublox 0:19aa55d66228 35 mbed::DigitalInOut SCL(scl, PIN_OUTPUT, PullUp, 0);
group-ublox 0:19aa55d66228 36 //generate 9 clocks for worst-case scenario
group-ublox 0:19aa55d66228 37 for (int i = 0; i < 10; ++i) {
group-ublox 0:19aa55d66228 38 SCL = 1;
group-ublox 0:19aa55d66228 39 wait_us(5);
group-ublox 0:19aa55d66228 40 SCL = 0;
group-ublox 0:19aa55d66228 41 wait_us(5);
group-ublox 0:19aa55d66228 42 }
group-ublox 0:19aa55d66228 43 //generate a STOP condition
group-ublox 0:19aa55d66228 44 SDA = 0;
group-ublox 0:19aa55d66228 45 wait_us(5);
group-ublox 0:19aa55d66228 46 SCL = 1;
group-ublox 0:19aa55d66228 47 wait_us(5);
group-ublox 0:19aa55d66228 48 SDA = 1;
group-ublox 0:19aa55d66228 49 wait_us(5);
group-ublox 0:19aa55d66228 50 }
group-ublox 0:19aa55d66228 51
group-ublox 0:19aa55d66228 52 /*I2C needs to be reset before constructing the I2C object (in case I2C is stuck)
group-ublox 0:19aa55d66228 53 because they use the same pins, therefore i2c_reset has to be before _i2c
group-ublox 0:19aa55d66228 54 in the initializer list*/
group-ublox 0:19aa55d66228 55 AT24Mac::AT24Mac(PinName sda, PinName scl) : i2c_reset(sda, scl), _i2c(sda, scl)
group-ublox 0:19aa55d66228 56 {
group-ublox 0:19aa55d66228 57 // Do nothing
group-ublox 0:19aa55d66228 58 }
group-ublox 0:19aa55d66228 59
group-ublox 0:19aa55d66228 60 int AT24Mac::read_serial(void *buf)
group-ublox 0:19aa55d66228 61 {
group-ublox 0:19aa55d66228 62 char offset = AT24MAC_SERIAL_OFFSET;
group-ublox 0:19aa55d66228 63 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
group-ublox 0:19aa55d66228 64 return -1; //No ACK
group-ublox 0:19aa55d66228 65 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, SERIAL_LEN);
group-ublox 0:19aa55d66228 66 }
group-ublox 0:19aa55d66228 67
group-ublox 0:19aa55d66228 68 int AT24Mac::read_eui64(void *buf)
group-ublox 0:19aa55d66228 69 {
group-ublox 0:19aa55d66228 70 char offset = AT24MAC_EUI64_OFFSET;
group-ublox 0:19aa55d66228 71 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
group-ublox 0:19aa55d66228 72 return -1; //No ACK
group-ublox 0:19aa55d66228 73 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI64_LEN);
group-ublox 0:19aa55d66228 74 }
group-ublox 0:19aa55d66228 75
group-ublox 0:19aa55d66228 76 int AT24Mac::read_eui48(void *buf)
group-ublox 0:19aa55d66228 77 {
group-ublox 0:19aa55d66228 78 char offset = AT24MAC_EUI48_OFFSET;
group-ublox 0:19aa55d66228 79 if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true))
group-ublox 0:19aa55d66228 80 return -1; //No ACK
group-ublox 0:19aa55d66228 81 return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI48_LEN);
group-ublox 0:19aa55d66228 82 }