Aleksandrs Gumenuks / MaximInterface_Extended

Extended MaximInterface

Dependents:   mbed_DS28EC20_GPIO

Platforms/mxc/I2CMaster.cpp@0:f77ad7f72d04, 2017-11-06 (annotated)

Committer:
IanBenzMaxim
Date:
Mon Nov 06 14:39:18 2017 -0600
Revision:
0:f77ad7f72d04
Initial commit.

Who changed what in which revision?

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IanBenzMaxim 0:f77ad7f72d04 1 /*******************************************************************************
IanBenzMaxim 0:f77ad7f72d04 2 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 0:f77ad7f72d04 3 *
IanBenzMaxim 0:f77ad7f72d04 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 0:f77ad7f72d04 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 0:f77ad7f72d04 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 0:f77ad7f72d04 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 0:f77ad7f72d04 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 0:f77ad7f72d04 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 0:f77ad7f72d04 10 *
IanBenzMaxim 0:f77ad7f72d04 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 0:f77ad7f72d04 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 0:f77ad7f72d04 13 *
IanBenzMaxim 0:f77ad7f72d04 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 0:f77ad7f72d04 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 0:f77ad7f72d04 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 0:f77ad7f72d04 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 0:f77ad7f72d04 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 0:f77ad7f72d04 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 0:f77ad7f72d04 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 0:f77ad7f72d04 21 *
IanBenzMaxim 0:f77ad7f72d04 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 0:f77ad7f72d04 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 0:f77ad7f72d04 24 * Products, Inc. Branding Policy.
IanBenzMaxim 0:f77ad7f72d04 25 *
IanBenzMaxim 0:f77ad7f72d04 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 0:f77ad7f72d04 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 0:f77ad7f72d04 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 0:f77ad7f72d04 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 0:f77ad7f72d04 30 * ownership rights.
IanBenzMaxim 0:f77ad7f72d04 31 *******************************************************************************/
IanBenzMaxim 0:f77ad7f72d04 32
IanBenzMaxim 0:f77ad7f72d04 33 #include <mxc_device.h>
IanBenzMaxim 0:f77ad7f72d04 34 #include "Error.hpp"
IanBenzMaxim 0:f77ad7f72d04 35 #include "I2CMaster.hpp"
IanBenzMaxim 0:f77ad7f72d04 36
IanBenzMaxim 0:f77ad7f72d04 37 namespace MaximInterface {
IanBenzMaxim 0:f77ad7f72d04 38 namespace mxc {
IanBenzMaxim 0:f77ad7f72d04 39
IanBenzMaxim 0:f77ad7f72d04 40 static void verifyTransactionStarted(mxc_i2cm_regs_t & i2cm) {
IanBenzMaxim 0:f77ad7f72d04 41 if (!(i2cm.trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
IanBenzMaxim 0:f77ad7f72d04 42 i2cm.trans |= MXC_F_I2CM_TRANS_TX_START;
IanBenzMaxim 0:f77ad7f72d04 43 }
IanBenzMaxim 0:f77ad7f72d04 44 }
IanBenzMaxim 0:f77ad7f72d04 45
IanBenzMaxim 0:f77ad7f72d04 46 error_code I2CMaster::initialize(const sys_cfg_i2cm_t & sysCfg,
IanBenzMaxim 0:f77ad7f72d04 47 i2cm_speed_t speed) {
IanBenzMaxim 0:f77ad7f72d04 48 return makeErrorCode(I2CM_Init(i2cm, &sysCfg, speed));
IanBenzMaxim 0:f77ad7f72d04 49 }
IanBenzMaxim 0:f77ad7f72d04 50
IanBenzMaxim 0:f77ad7f72d04 51 error_code I2CMaster::shutdown() { return makeErrorCode(I2CM_Shutdown(i2cm)); }
IanBenzMaxim 0:f77ad7f72d04 52
IanBenzMaxim 0:f77ad7f72d04 53 error_code I2CMaster::writeByte(uint_least8_t data, bool start) {
IanBenzMaxim 0:f77ad7f72d04 54 const uint16_t fifoData =
IanBenzMaxim 0:f77ad7f72d04 55 static_cast<uint16_t>(data & 0xFF) |
IanBenzMaxim 0:f77ad7f72d04 56 (start ? MXC_S_I2CM_TRANS_TAG_START : MXC_S_I2CM_TRANS_TAG_TXDATA_ACK);
IanBenzMaxim 0:f77ad7f72d04 57 const error_code result =
IanBenzMaxim 0:f77ad7f72d04 58 makeErrorCode(I2CM_WriteTxFifo(i2cm, i2cmFifo, fifoData));
IanBenzMaxim 0:f77ad7f72d04 59 if (result) {
IanBenzMaxim 0:f77ad7f72d04 60 I2CM_Recover(i2cm);
IanBenzMaxim 0:f77ad7f72d04 61 } else {
IanBenzMaxim 0:f77ad7f72d04 62 verifyTransactionStarted(*i2cm);
IanBenzMaxim 0:f77ad7f72d04 63 }
IanBenzMaxim 0:f77ad7f72d04 64 return result;
IanBenzMaxim 0:f77ad7f72d04 65 }
IanBenzMaxim 0:f77ad7f72d04 66
IanBenzMaxim 0:f77ad7f72d04 67 error_code I2CMaster::start(uint_least8_t address) {
IanBenzMaxim 0:f77ad7f72d04 68 return writeByte(address, true);
IanBenzMaxim 0:f77ad7f72d04 69 }
IanBenzMaxim 0:f77ad7f72d04 70
IanBenzMaxim 0:f77ad7f72d04 71 error_code I2CMaster::stop() {
IanBenzMaxim 0:f77ad7f72d04 72 error_code result = makeErrorCode(
IanBenzMaxim 0:f77ad7f72d04 73 I2CM_WriteTxFifo(i2cm, i2cmFifo, MXC_S_I2CM_TRANS_TAG_STOP));
IanBenzMaxim 0:f77ad7f72d04 74 if (!result) {
IanBenzMaxim 0:f77ad7f72d04 75 result = makeErrorCode(I2CM_TxInProgress(i2cm));
IanBenzMaxim 0:f77ad7f72d04 76 }
IanBenzMaxim 0:f77ad7f72d04 77 return result;
IanBenzMaxim 0:f77ad7f72d04 78 }
IanBenzMaxim 0:f77ad7f72d04 79
IanBenzMaxim 0:f77ad7f72d04 80 error_code I2CMaster::writeByte(uint_least8_t data) {
IanBenzMaxim 0:f77ad7f72d04 81 return writeByte(data, false);
IanBenzMaxim 0:f77ad7f72d04 82 }
IanBenzMaxim 0:f77ad7f72d04 83
IanBenzMaxim 0:f77ad7f72d04 84 error_code I2CMaster::readByte(AckStatus status, uint_least8_t & data) {
IanBenzMaxim 0:f77ad7f72d04 85 uint16_t fifoData = (status == Nack) ? MXC_S_I2CM_TRANS_TAG_RXDATA_NACK
IanBenzMaxim 0:f77ad7f72d04 86 : MXC_S_I2CM_TRANS_TAG_RXDATA_COUNT;
IanBenzMaxim 0:f77ad7f72d04 87 error_code result = makeErrorCode(I2CM_WriteTxFifo(i2cm, i2cmFifo, fifoData));
IanBenzMaxim 0:f77ad7f72d04 88 if (!result) {
IanBenzMaxim 0:f77ad7f72d04 89 verifyTransactionStarted(*i2cm);
IanBenzMaxim 0:f77ad7f72d04 90 do {
IanBenzMaxim 0:f77ad7f72d04 91 int timeout = 0x5000;
IanBenzMaxim 0:f77ad7f72d04 92 while ((i2cm->bb & MXC_F_I2CM_BB_RX_FIFO_CNT) == 0) {
IanBenzMaxim 0:f77ad7f72d04 93 if ((--timeout <= 0) || (i2cm->trans & MXC_F_I2CM_TRANS_TX_TIMEOUT)) {
IanBenzMaxim 0:f77ad7f72d04 94 result = makeErrorCode(E_TIME_OUT);
IanBenzMaxim 0:f77ad7f72d04 95 goto exit;
IanBenzMaxim 0:f77ad7f72d04 96 }
IanBenzMaxim 0:f77ad7f72d04 97 if (i2cm->trans &
IanBenzMaxim 0:f77ad7f72d04 98 (MXC_F_I2CM_TRANS_TX_LOST_ARBITR | MXC_F_I2CM_TRANS_TX_NACKED)) {
IanBenzMaxim 0:f77ad7f72d04 99 result = make_error_code(NackError);
IanBenzMaxim 0:f77ad7f72d04 100 goto exit;
IanBenzMaxim 0:f77ad7f72d04 101 }
IanBenzMaxim 0:f77ad7f72d04 102 }
IanBenzMaxim 0:f77ad7f72d04 103 fifoData = i2cmFifo->rx;
IanBenzMaxim 0:f77ad7f72d04 104 } while (fifoData & MXC_S_I2CM_RSTLS_TAG_EMPTY);
IanBenzMaxim 0:f77ad7f72d04 105 data = fifoData & 0xFF;
IanBenzMaxim 0:f77ad7f72d04 106 }
IanBenzMaxim 0:f77ad7f72d04 107
IanBenzMaxim 0:f77ad7f72d04 108 exit:
IanBenzMaxim 0:f77ad7f72d04 109 if (result) {
IanBenzMaxim 0:f77ad7f72d04 110 I2CM_Recover(i2cm);
IanBenzMaxim 0:f77ad7f72d04 111 }
IanBenzMaxim 0:f77ad7f72d04 112 return result;
IanBenzMaxim 0:f77ad7f72d04 113 }
IanBenzMaxim 0:f77ad7f72d04 114
IanBenzMaxim 0:f77ad7f72d04 115 } // namespace mxc
IanBenzMaxim 0:f77ad7f72d04 116 } // namespace MaximInterface