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components/802_15_4_RF/atmel-rf-driver/source/at24mac.cpp@2:7aab896b1a3b, 2019-03-13 (annotated)
- Committer:
- kevman
- Date:
- Wed Mar 13 11:03:24 2019 +0000
- Revision:
- 2:7aab896b1a3b
2019-03-13
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kevman | 2:7aab896b1a3b | 1 | /* |
kevman | 2:7aab896b1a3b | 2 | * Copyright (c) 2016-2016 ARM Limited. All rights reserved. |
kevman | 2:7aab896b1a3b | 3 | * SPDX-License-Identifier: Apache-2.0 |
kevman | 2:7aab896b1a3b | 4 | * Licensed under the Apache License, Version 2.0 (the License); you may |
kevman | 2:7aab896b1a3b | 5 | * not use this file except in compliance with the License. |
kevman | 2:7aab896b1a3b | 6 | * You may obtain a copy of the License at |
kevman | 2:7aab896b1a3b | 7 | * |
kevman | 2:7aab896b1a3b | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
kevman | 2:7aab896b1a3b | 9 | * |
kevman | 2:7aab896b1a3b | 10 | * Unless required by applicable law or agreed to in writing, software |
kevman | 2:7aab896b1a3b | 11 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
kevman | 2:7aab896b1a3b | 12 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kevman | 2:7aab896b1a3b | 13 | * See the License for the specific language governing permissions and |
kevman | 2:7aab896b1a3b | 14 | * limitations under the License. |
kevman | 2:7aab896b1a3b | 15 | */ |
kevman | 2:7aab896b1a3b | 16 | #include "at24mac.h" |
kevman | 2:7aab896b1a3b | 17 | |
kevman | 2:7aab896b1a3b | 18 | #if DEVICE_I2C |
kevman | 2:7aab896b1a3b | 19 | |
kevman | 2:7aab896b1a3b | 20 | /* Device addressing */ |
kevman | 2:7aab896b1a3b | 21 | #define AT24MAC_EEPROM_ADDRESS (0x0A<<4) |
kevman | 2:7aab896b1a3b | 22 | #define AT24MAC_RW_PROTECT_ADDRESS (0x06<<4) |
kevman | 2:7aab896b1a3b | 23 | #define AT24MAC_SERIAL_ADDRESS (0x0B<<4) |
kevman | 2:7aab896b1a3b | 24 | |
kevman | 2:7aab896b1a3b | 25 | /* Known memory blocks */ |
kevman | 2:7aab896b1a3b | 26 | #define AT24MAC_SERIAL_OFFSET (0x80) |
kevman | 2:7aab896b1a3b | 27 | #define AT24MAC_EUI64_OFFSET (0x98) |
kevman | 2:7aab896b1a3b | 28 | #define AT24MAC_EUI48_OFFSET (0x9A) |
kevman | 2:7aab896b1a3b | 29 | |
kevman | 2:7aab896b1a3b | 30 | #define SERIAL_LEN 16 |
kevman | 2:7aab896b1a3b | 31 | #define EUI64_LEN 8 |
kevman | 2:7aab896b1a3b | 32 | #define EUI48_LEN 6 |
kevman | 2:7aab896b1a3b | 33 | |
kevman | 2:7aab896b1a3b | 34 | AT24Mac::I2CReset::I2CReset(PinName sda, PinName scl) |
kevman | 2:7aab896b1a3b | 35 | { |
kevman | 2:7aab896b1a3b | 36 | mbed::DigitalInOut pin_sda(sda, PIN_OUTPUT, PullUp, 1); |
kevman | 2:7aab896b1a3b | 37 | mbed::DigitalInOut pin_scl(scl, PIN_OUTPUT, PullUp, 0); |
kevman | 2:7aab896b1a3b | 38 | //generate 9 clocks for worst-case scenario |
kevman | 2:7aab896b1a3b | 39 | for (int i = 0; i < 10; ++i) { |
kevman | 2:7aab896b1a3b | 40 | pin_scl = 1; |
kevman | 2:7aab896b1a3b | 41 | wait_us(5); |
kevman | 2:7aab896b1a3b | 42 | pin_scl = 0; |
kevman | 2:7aab896b1a3b | 43 | wait_us(5); |
kevman | 2:7aab896b1a3b | 44 | } |
kevman | 2:7aab896b1a3b | 45 | //generate a STOP condition |
kevman | 2:7aab896b1a3b | 46 | pin_sda = 0; |
kevman | 2:7aab896b1a3b | 47 | wait_us(5); |
kevman | 2:7aab896b1a3b | 48 | pin_scl = 1; |
kevman | 2:7aab896b1a3b | 49 | wait_us(5); |
kevman | 2:7aab896b1a3b | 50 | pin_sda = 1; |
kevman | 2:7aab896b1a3b | 51 | wait_us(5); |
kevman | 2:7aab896b1a3b | 52 | } |
kevman | 2:7aab896b1a3b | 53 | |
kevman | 2:7aab896b1a3b | 54 | /*I2C needs to be reset before constructing the I2C object (in case I2C is stuck) |
kevman | 2:7aab896b1a3b | 55 | because they use the same pins, therefore i2c_reset has to be before _i2c |
kevman | 2:7aab896b1a3b | 56 | in the initializer list*/ |
kevman | 2:7aab896b1a3b | 57 | AT24Mac::AT24Mac(PinName sda, PinName scl) : i2c_reset(sda, scl), _i2c(sda, scl) |
kevman | 2:7aab896b1a3b | 58 | { |
kevman | 2:7aab896b1a3b | 59 | // Do nothing |
kevman | 2:7aab896b1a3b | 60 | } |
kevman | 2:7aab896b1a3b | 61 | |
kevman | 2:7aab896b1a3b | 62 | int AT24Mac::read_serial(void *buf) |
kevman | 2:7aab896b1a3b | 63 | { |
kevman | 2:7aab896b1a3b | 64 | char offset = AT24MAC_SERIAL_OFFSET; |
kevman | 2:7aab896b1a3b | 65 | if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true)) |
kevman | 2:7aab896b1a3b | 66 | return -1; //No ACK |
kevman | 2:7aab896b1a3b | 67 | return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, SERIAL_LEN); |
kevman | 2:7aab896b1a3b | 68 | } |
kevman | 2:7aab896b1a3b | 69 | |
kevman | 2:7aab896b1a3b | 70 | int AT24Mac::read_eui64(void *buf) |
kevman | 2:7aab896b1a3b | 71 | { |
kevman | 2:7aab896b1a3b | 72 | char offset = AT24MAC_EUI64_OFFSET; |
kevman | 2:7aab896b1a3b | 73 | if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true)) |
kevman | 2:7aab896b1a3b | 74 | return -1; //No ACK |
kevman | 2:7aab896b1a3b | 75 | return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI64_LEN); |
kevman | 2:7aab896b1a3b | 76 | } |
kevman | 2:7aab896b1a3b | 77 | |
kevman | 2:7aab896b1a3b | 78 | int AT24Mac::read_eui48(void *buf) |
kevman | 2:7aab896b1a3b | 79 | { |
kevman | 2:7aab896b1a3b | 80 | char offset = AT24MAC_EUI48_OFFSET; |
kevman | 2:7aab896b1a3b | 81 | if (_i2c.write(AT24MAC_SERIAL_ADDRESS, &offset, 1, true)) |
kevman | 2:7aab896b1a3b | 82 | return -1; //No ACK |
kevman | 2:7aab896b1a3b | 83 | return _i2c.read(AT24MAC_SERIAL_ADDRESS, (char*)buf, EUI48_LEN); |
kevman | 2:7aab896b1a3b | 84 | } |
kevman | 2:7aab896b1a3b | 85 | |
kevman | 2:7aab896b1a3b | 86 | #endif /* DEVICE_I2C */ |