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hal/i2c_api.h@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
107:414e9c822e99
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

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bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2015 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #ifndef MBED_I2C_API_H
bogdanm 0:9b334a45a8ff 17 #define MBED_I2C_API_H
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #include "device.h"
bogdanm 0:9b334a45a8ff 20 #include "buffer.h"
bogdanm 0:9b334a45a8ff 21
bogdanm 0:9b334a45a8ff 22 #if DEVICE_I2C
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 /**
bogdanm 0:9b334a45a8ff 25 * @defgroup I2CEvents I2C Events Macros
bogdanm 0:9b334a45a8ff 26 *
bogdanm 0:9b334a45a8ff 27 * @{
bogdanm 0:9b334a45a8ff 28 */
bogdanm 0:9b334a45a8ff 29 #define I2C_EVENT_ERROR (1 << 1)
bogdanm 0:9b334a45a8ff 30 #define I2C_EVENT_ERROR_NO_SLAVE (1 << 2)
bogdanm 0:9b334a45a8ff 31 #define I2C_EVENT_TRANSFER_COMPLETE (1 << 3)
bogdanm 0:9b334a45a8ff 32 #define I2C_EVENT_TRANSFER_EARLY_NACK (1 << 4)
bogdanm 0:9b334a45a8ff 33 #define I2C_EVENT_ALL (I2C_EVENT_ERROR | I2C_EVENT_TRANSFER_COMPLETE | I2C_EVENT_ERROR_NO_SLAVE | I2C_EVENT_TRANSFER_EARLY_NACK)
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 /**@}*/
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 #if DEVICE_I2C_ASYNCH
bogdanm 0:9b334a45a8ff 38 /** Asynch i2c hal structure
bogdanm 0:9b334a45a8ff 39 */
bogdanm 0:9b334a45a8ff 40 typedef struct {
bogdanm 0:9b334a45a8ff 41 struct i2c_s i2c; /**< Target specific i2c structure */
bogdanm 0:9b334a45a8ff 42 struct buffer_s tx_buff; /**< Tx buffer */
bogdanm 0:9b334a45a8ff 43 struct buffer_s rx_buff; /**< Rx buffer */
bogdanm 0:9b334a45a8ff 44 } i2c_t;
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 #else
bogdanm 0:9b334a45a8ff 47 /** Non-asynch i2c hal structure
bogdanm 0:9b334a45a8ff 48 */
bogdanm 0:9b334a45a8ff 49 typedef struct i2c_s i2c_t;
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 #endif
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 enum {
bogdanm 0:9b334a45a8ff 54 I2C_ERROR_NO_SLAVE = -1,
bogdanm 0:9b334a45a8ff 55 I2C_ERROR_BUS_BUSY = -2
bogdanm 0:9b334a45a8ff 56 };
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 59 extern "C" {
bogdanm 0:9b334a45a8ff 60 #endif
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 /**
bogdanm 0:9b334a45a8ff 63 * \defgroup GeneralI2C I2C Configuration Functions
bogdanm 0:9b334a45a8ff 64 * @{
bogdanm 0:9b334a45a8ff 65 */
bogdanm 0:9b334a45a8ff 66
bogdanm 0:9b334a45a8ff 67 /** Initialize the I2C peripheral. It sets the default parameters for I2C
bogdanm 0:9b334a45a8ff 68 * peripheral, and configure its specifieds pins.
bogdanm 0:9b334a45a8ff 69 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 70 * @param sda The sda pin
bogdanm 0:9b334a45a8ff 71 * @param scl The scl pin
bogdanm 0:9b334a45a8ff 72 */
bogdanm 0:9b334a45a8ff 73 void i2c_init(i2c_t *obj, PinName sda, PinName scl);
bogdanm 0:9b334a45a8ff 74
bogdanm 0:9b334a45a8ff 75 /** Configure the I2C frequency.
bogdanm 0:9b334a45a8ff 76 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 77 * @param hz Frequency in Hz
bogdanm 0:9b334a45a8ff 78 */
bogdanm 0:9b334a45a8ff 79 void i2c_frequency(i2c_t *obj, int hz);
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 /** Send START command.
bogdanm 0:9b334a45a8ff 82 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 83 */
bogdanm 0:9b334a45a8ff 84 int i2c_start(i2c_t *obj);
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 /** Send STOP command.
bogdanm 0:9b334a45a8ff 87 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 88 */
bogdanm 0:9b334a45a8ff 89 int i2c_stop(i2c_t *obj);
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 /** Blocking reading data.
bogdanm 0:9b334a45a8ff 92 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 93 * @param address 7-bit address (last bit is 1)
bogdanm 0:9b334a45a8ff 94 * @param data The buffer for receiving
bogdanm 0:9b334a45a8ff 95 * @param length Number of bytes to read
bogdanm 0:9b334a45a8ff 96 * @param stop Stop to be generated after the transfer is done
bogdanm 0:9b334a45a8ff 97 * @return Number of read bytes
bogdanm 0:9b334a45a8ff 98 */
bogdanm 0:9b334a45a8ff 99 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop);
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 /** Blocking sending data.
bogdanm 0:9b334a45a8ff 102 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 103 * @param address 7-bit address (last bit is 0)
bogdanm 0:9b334a45a8ff 104 * @param data The buffer for sending
bogdanm 0:9b334a45a8ff 105 * @param length Number of bytes to wrte
bogdanm 0:9b334a45a8ff 106 * @param stop Stop to be generated after the transfer is done
bogdanm 0:9b334a45a8ff 107 * @return Number of written bytes
bogdanm 0:9b334a45a8ff 108 */
bogdanm 0:9b334a45a8ff 109 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop);
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 /** Reset I2C peripheral. TODO: The action here. Most of the implementation sends stop().
bogdanm 0:9b334a45a8ff 112 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 113 */
bogdanm 0:9b334a45a8ff 114 void i2c_reset(i2c_t *obj);
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 /** Read one byte.
bogdanm 0:9b334a45a8ff 117 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 118 * @param last Acknoledge
bogdanm 0:9b334a45a8ff 119 * @return The read byte
bogdanm 0:9b334a45a8ff 120 */
bogdanm 0:9b334a45a8ff 121 int i2c_byte_read(i2c_t *obj, int last);
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 /** Write one byte.
bogdanm 0:9b334a45a8ff 124 * @param obj The i2c object
bogdanm 0:9b334a45a8ff 125 * @param data Byte to be written
bogdanm 0:9b334a45a8ff 126 * @return 1 if NAK was received, 0 if ACK was received, 2 for timeout.
bogdanm 0:9b334a45a8ff 127 */
bogdanm 0:9b334a45a8ff 128 int i2c_byte_write(i2c_t *obj, int data);
bogdanm 0:9b334a45a8ff 129
bogdanm 0:9b334a45a8ff 130 /**@}*/
bogdanm 0:9b334a45a8ff 131
bogdanm 0:9b334a45a8ff 132 #if DEVICE_I2CSLAVE
bogdanm 0:9b334a45a8ff 133
bogdanm 0:9b334a45a8ff 134 /**
bogdanm 0:9b334a45a8ff 135 * \defgroup SynchI2C Synchronous I2C Hardware Abstraction Layer for slave
bogdanm 0:9b334a45a8ff 136 * @{
bogdanm 0:9b334a45a8ff 137 */
bogdanm 0:9b334a45a8ff 138
bogdanm 0:9b334a45a8ff 139 /** Configure I2C as slave or master.
bogdanm 0:9b334a45a8ff 140 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 141 * @return non-zero if a value is available
bogdanm 0:9b334a45a8ff 142 */
bogdanm 0:9b334a45a8ff 143 void i2c_slave_mode(i2c_t *obj, int enable_slave);
bogdanm 0:9b334a45a8ff 144
bogdanm 0:9b334a45a8ff 145 /** Check to see if the I2C slave has been addressed.
bogdanm 0:9b334a45a8ff 146 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 147 * @return The status - 1 - read addresses, 2 - write to all slaves,
bogdanm 0:9b334a45a8ff 148 * 3 write addressed, 0 - the slave has not been addressed
bogdanm 0:9b334a45a8ff 149 */
bogdanm 0:9b334a45a8ff 150 int i2c_slave_receive(i2c_t *obj);
bogdanm 0:9b334a45a8ff 151
bogdanm 0:9b334a45a8ff 152 /** Configure I2C as slave or master.
bogdanm 0:9b334a45a8ff 153 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 154 * @return non-zero if a value is available
bogdanm 0:9b334a45a8ff 155 */
bogdanm 0:9b334a45a8ff 156 int i2c_slave_read(i2c_t *obj, char *data, int length);
bogdanm 0:9b334a45a8ff 157
bogdanm 0:9b334a45a8ff 158 /** Configure I2C as slave or master.
bogdanm 0:9b334a45a8ff 159 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 160 * @return non-zero if a value is available
bogdanm 0:9b334a45a8ff 161 */
bogdanm 0:9b334a45a8ff 162 int i2c_slave_write(i2c_t *obj, const char *data, int length);
bogdanm 0:9b334a45a8ff 163
bogdanm 0:9b334a45a8ff 164 /** Configure I2C address.
bogdanm 0:9b334a45a8ff 165 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 166 * @param idx Currently not used
bogdanm 0:9b334a45a8ff 167 * @param address The address to be set
bogdanm 0:9b334a45a8ff 168 * @param mask Currently not used
bogdanm 0:9b334a45a8ff 169 */
bogdanm 0:9b334a45a8ff 170 void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask);
bogdanm 0:9b334a45a8ff 171
bogdanm 0:9b334a45a8ff 172 #endif
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 /**@}*/
bogdanm 0:9b334a45a8ff 175
bogdanm 0:9b334a45a8ff 176 #if DEVICE_I2C_ASYNCH
bogdanm 0:9b334a45a8ff 177
bogdanm 0:9b334a45a8ff 178 /**
bogdanm 0:9b334a45a8ff 179 * \defgroup AsynchI2C Asynchronous I2C Hardware Abstraction Layer
bogdanm 0:9b334a45a8ff 180 * @{
bogdanm 0:9b334a45a8ff 181 */
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 /** Start i2c asynchronous transfer.
bogdanm 0:9b334a45a8ff 184 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 185 * @param tx The buffer to send
bogdanm 0:9b334a45a8ff 186 * @param tx_length The number of words to transmit
bogdanm 0:9b334a45a8ff 187 * @param rx The buffer to receive
bogdanm 0:9b334a45a8ff 188 * @param rx_length The number of words to receive
bogdanm 0:9b334a45a8ff 189 * @param address The address to be set - 7bit or 9 bit
bogdanm 0:9b334a45a8ff 190 * @param stop If true, stop will be generated after the transfer is done
bogdanm 0:9b334a45a8ff 191 * @param handler The I2C IRQ handler to be set
bogdanm 0:9b334a45a8ff 192 * @param hint DMA hint usage
bogdanm 0:9b334a45a8ff 193 */
bogdanm 0:9b334a45a8ff 194 void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint);
bogdanm 0:9b334a45a8ff 195
bogdanm 0:9b334a45a8ff 196 /** The asynchronous IRQ handler
bogdanm 0:9b334a45a8ff 197 * @param obj The I2C object which holds the transfer information
bogdanm 0:9b334a45a8ff 198 * @return event flags if a transfer termination condition was met or 0 otherwise.
bogdanm 0:9b334a45a8ff 199 */
bogdanm 0:9b334a45a8ff 200 uint32_t i2c_irq_handler_asynch(i2c_t *obj);
bogdanm 0:9b334a45a8ff 201
bogdanm 0:9b334a45a8ff 202 /** Attempts to determine if I2C peripheral is already in use.
bogdanm 0:9b334a45a8ff 203 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 204 * @return non-zero if the I2C module is active or zero if it is not
bogdanm 0:9b334a45a8ff 205 */
bogdanm 0:9b334a45a8ff 206 uint8_t i2c_active(i2c_t *obj);
bogdanm 0:9b334a45a8ff 207
bogdanm 0:9b334a45a8ff 208 /** Abort ongoing asynchronous transaction.
bogdanm 0:9b334a45a8ff 209 * @param obj The I2C object
bogdanm 0:9b334a45a8ff 210 */
bogdanm 0:9b334a45a8ff 211 void i2c_abort_asynch(i2c_t *obj);
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 #endif
bogdanm 0:9b334a45a8ff 214
bogdanm 0:9b334a45a8ff 215 /**@}*/
bogdanm 0:9b334a45a8ff 216
bogdanm 0:9b334a45a8ff 217 #ifdef __cplusplus
bogdanm 0:9b334a45a8ff 218 }
bogdanm 0:9b334a45a8ff 219 #endif
bogdanm 0:9b334a45a8ff 220
bogdanm 0:9b334a45a8ff 221 #endif
bogdanm 0:9b334a45a8ff 222
bogdanm 0:9b334a45a8ff 223 #endif