Lancaster University / microbit-dal

mbed.org local branch of microbit-dal. The real version lives in git at https://github.com/lancaster-university/microbit-dal

Dependencies:   BLE_API nRF51822 mbed-dev-bin

Dependents:   microbit Microbit IoTChallenge1 microbit ... more

inc/drivers/MicroBitI2C.h@1:8aa5cdb4ab67, 2016-04-07 (annotated)

Committer:
Jonathan Austin
Date:
Thu Apr 07 01:33:22 2016 +0100
Revision:
1:8aa5cdb4ab67
Child:
4:9fbeeb89de59
Synchronized with git rev 55cb9199

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 #ifndef MICROBIT_I2C_H
Jonathan Austin 1:8aa5cdb4ab67 27 #define MICROBIT_I2C_H
Jonathan Austin 1:8aa5cdb4ab67 28
Jonathan Austin 1:8aa5cdb4ab67 29 #include "mbed.h"
Jonathan Austin 1:8aa5cdb4ab67 30 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 31
Jonathan Austin 1:8aa5cdb4ab67 32 #define MICROBIT_I2C_MAX_RETRIES 9
Jonathan Austin 1:8aa5cdb4ab67 33
Jonathan Austin 1:8aa5cdb4ab67 34 /**
Jonathan Austin 1:8aa5cdb4ab67 35 * Class definition for MicroBitI2C.
Jonathan Austin 1:8aa5cdb4ab67 36 *
Jonathan Austin 1:8aa5cdb4ab67 37 * Presents a wrapped mbed call to capture failed I2C operations caused by a known silicon bug in the nrf51822.
Jonathan Austin 1:8aa5cdb4ab67 38 * Attempts to automatically reset and restart the I2C hardware if this case is detected.
Jonathan Austin 1:8aa5cdb4ab67 39 *
Jonathan Austin 1:8aa5cdb4ab67 40 * For reference see PAN56 in:
Jonathan Austin 1:8aa5cdb4ab67 41 *
Jonathan Austin 1:8aa5cdb4ab67 42 * https://www.nordicsemi.com/eng/nordic/Products/nRF51822/PAN-nRF51822/24634
Jonathan Austin 1:8aa5cdb4ab67 43 *
Jonathan Austin 1:8aa5cdb4ab67 44 * v2.0 through to v2.4
Jonathan Austin 1:8aa5cdb4ab67 45 */
Jonathan Austin 1:8aa5cdb4ab67 46 class MicroBitI2C : public I2C
Jonathan Austin 1:8aa5cdb4ab67 47 {
Jonathan Austin 1:8aa5cdb4ab67 48 uint8_t retries;
Jonathan Austin 1:8aa5cdb4ab67 49
Jonathan Austin 1:8aa5cdb4ab67 50 public:
Jonathan Austin 1:8aa5cdb4ab67 51
Jonathan Austin 1:8aa5cdb4ab67 52 /**
Jonathan Austin 1:8aa5cdb4ab67 53 * Constructor.
Jonathan Austin 1:8aa5cdb4ab67 54 *
Jonathan Austin 1:8aa5cdb4ab67 55 * Create an instance of MicroBitI2C for I2C communication.
Jonathan Austin 1:8aa5cdb4ab67 56 *
Jonathan Austin 1:8aa5cdb4ab67 57 * @param sda the Pin to be used for SDA
Jonathan Austin 1:8aa5cdb4ab67 58 *
Jonathan Austin 1:8aa5cdb4ab67 59 * @param scl the Pin to be used for SCL
Jonathan Austin 1:8aa5cdb4ab67 60 *
Jonathan Austin 1:8aa5cdb4ab67 61 * @code
Jonathan Austin 1:8aa5cdb4ab67 62 * MicroBitI2C i2c(I2C_SDA0, I2C_SCL0);
Jonathan Austin 1:8aa5cdb4ab67 63 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 64 *
Jonathan Austin 1:8aa5cdb4ab67 65 * @note This class presents a wrapped mbed call to capture failed I2C operations caused by a known silicon bug in the nrf51822.
Jonathan Austin 1:8aa5cdb4ab67 66 * Attempts to automatically reset and restart the I2C hardware if this case is detected.
Jonathan Austin 1:8aa5cdb4ab67 67 *
Jonathan Austin 1:8aa5cdb4ab67 68 * For reference see PAN56 in:
Jonathan Austin 1:8aa5cdb4ab67 69 *
Jonathan Austin 1:8aa5cdb4ab67 70 * https://www.nordicsemi.com/eng/nordic/Products/nRF51822/PAN-nRF51822/24634
Jonathan Austin 1:8aa5cdb4ab67 71 *
Jonathan Austin 1:8aa5cdb4ab67 72 * v2.0 through to v2.4
Jonathan Austin 1:8aa5cdb4ab67 73 */
Jonathan Austin 1:8aa5cdb4ab67 74 MicroBitI2C(PinName sda, PinName scl);
Jonathan Austin 1:8aa5cdb4ab67 75
Jonathan Austin 1:8aa5cdb4ab67 76 /**
Jonathan Austin 1:8aa5cdb4ab67 77 * Performs a complete read transaction. The bottom bit of the address is forced to 1 to indicate a read.
Jonathan Austin 1:8aa5cdb4ab67 78 *
Jonathan Austin 1:8aa5cdb4ab67 79 * @param address 8-bit I2C slave address [ addr | 1 ]
Jonathan Austin 1:8aa5cdb4ab67 80 *
Jonathan Austin 1:8aa5cdb4ab67 81 * @param data A pointer to a byte buffer used for storing retrieved data.
Jonathan Austin 1:8aa5cdb4ab67 82 *
Jonathan Austin 1:8aa5cdb4ab67 83 * @param length Number of bytes to read.
Jonathan Austin 1:8aa5cdb4ab67 84 *
Jonathan Austin 1:8aa5cdb4ab67 85 * @param repeated if true, stop is not sent at the end. Defaults to false.
Jonathan Austin 1:8aa5cdb4ab67 86 *
Jonathan Austin 1:8aa5cdb4ab67 87 * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if an unresolved read failure is detected.
Jonathan Austin 1:8aa5cdb4ab67 88 */
Jonathan Austin 1:8aa5cdb4ab67 89 int read(int address, char *data, int length, bool repeated = false);
Jonathan Austin 1:8aa5cdb4ab67 90
Jonathan Austin 1:8aa5cdb4ab67 91 /**
Jonathan Austin 1:8aa5cdb4ab67 92 * Performs a complete write transaction. The bottom bit of the address is forced to 0 to indicate a write.
Jonathan Austin 1:8aa5cdb4ab67 93 *
Jonathan Austin 1:8aa5cdb4ab67 94 * @param address 8-bit I2C slave address [ addr | 0 ]
Jonathan Austin 1:8aa5cdb4ab67 95 *
Jonathan Austin 1:8aa5cdb4ab67 96 * @param data A pointer to a byte buffer containing the data to write.
Jonathan Austin 1:8aa5cdb4ab67 97 *
Jonathan Austin 1:8aa5cdb4ab67 98 * @param length Number of bytes to write
Jonathan Austin 1:8aa5cdb4ab67 99 *
Jonathan Austin 1:8aa5cdb4ab67 100 * @param repeated if true, stop is not sent at the end. Defaults to false.
Jonathan Austin 1:8aa5cdb4ab67 101 *
Jonathan Austin 1:8aa5cdb4ab67 102 * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if an unresolved write failure is detected.
Jonathan Austin 1:8aa5cdb4ab67 103 */
Jonathan Austin 1:8aa5cdb4ab67 104 int write(int address, const char *data, int length, bool repeated = false);
Jonathan Austin 1:8aa5cdb4ab67 105 };
Jonathan Austin 1:8aa5cdb4ab67 106
Jonathan Austin 1:8aa5cdb4ab67 107 #endif