Diff: Platforms/mxc/I2CMaster.cpp

Revision:

0:f77ad7f72d04

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Platforms/mxc/I2CMaster.cpp	Mon Nov 06 14:39:18 2017 -0600
@@ -0,0 +1,116 @@
+/*******************************************************************************
+* Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a
+* copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,
+* and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+* OTHER DEALINGS IN THE SOFTWARE.
+*
+* Except as contained in this notice, the name of Maxim Integrated
+* Products, Inc. shall not be used except as stated in the Maxim Integrated
+* Products, Inc. Branding Policy.
+*
+* The mere transfer of this software does not imply any licenses
+* of trade secrets, proprietary technology, copyrights, patents,
+* trademarks, maskwork rights, or any other form of intellectual
+* property whatsoever. Maxim Integrated Products, Inc. retains all
+* ownership rights.
+*******************************************************************************/
+
+#include <mxc_device.h>
+#include "Error.hpp"
+#include "I2CMaster.hpp"
+
+namespace MaximInterface {
+namespace mxc {
+
+static void verifyTransactionStarted(mxc_i2cm_regs_t & i2cm) {
+  if (!(i2cm.trans & MXC_F_I2CM_TRANS_TX_IN_PROGRESS)) {
+    i2cm.trans |= MXC_F_I2CM_TRANS_TX_START;
+  }
+}
+
+error_code I2CMaster::initialize(const sys_cfg_i2cm_t & sysCfg,
+                                 i2cm_speed_t speed) {
+  return makeErrorCode(I2CM_Init(i2cm, &sysCfg, speed));
+}
+
+error_code I2CMaster::shutdown() { return makeErrorCode(I2CM_Shutdown(i2cm)); }
+
+error_code I2CMaster::writeByte(uint_least8_t data, bool start) {
+  const uint16_t fifoData =
+      static_cast<uint16_t>(data & 0xFF) |
+      (start ? MXC_S_I2CM_TRANS_TAG_START : MXC_S_I2CM_TRANS_TAG_TXDATA_ACK);
+  const error_code result =
+      makeErrorCode(I2CM_WriteTxFifo(i2cm, i2cmFifo, fifoData));
+  if (result) {
+    I2CM_Recover(i2cm);
+  } else {
+    verifyTransactionStarted(*i2cm);
+  }
+  return result;
+}
+
+error_code I2CMaster::start(uint_least8_t address) {
+  return writeByte(address, true);
+}
+
+error_code I2CMaster::stop() {
+  error_code result = makeErrorCode(
+      I2CM_WriteTxFifo(i2cm, i2cmFifo, MXC_S_I2CM_TRANS_TAG_STOP));
+  if (!result) {
+    result = makeErrorCode(I2CM_TxInProgress(i2cm));
+  }
+  return result;
+}
+
+error_code I2CMaster::writeByte(uint_least8_t data) {
+  return writeByte(data, false);
+}
+
+error_code I2CMaster::readByte(AckStatus status, uint_least8_t & data) {
+  uint16_t fifoData = (status == Nack) ? MXC_S_I2CM_TRANS_TAG_RXDATA_NACK
+                                       : MXC_S_I2CM_TRANS_TAG_RXDATA_COUNT;
+  error_code result = makeErrorCode(I2CM_WriteTxFifo(i2cm, i2cmFifo, fifoData));
+  if (!result) {
+    verifyTransactionStarted(*i2cm);
+    do {
+      int timeout = 0x5000;
+      while ((i2cm->bb & MXC_F_I2CM_BB_RX_FIFO_CNT) == 0) {
+        if ((--timeout <= 0) || (i2cm->trans & MXC_F_I2CM_TRANS_TX_TIMEOUT)) {
+          result = makeErrorCode(E_TIME_OUT);
+          goto exit;
+        }
+        if (i2cm->trans &
+            (MXC_F_I2CM_TRANS_TX_LOST_ARBITR | MXC_F_I2CM_TRANS_TX_NACKED)) {
+          result = make_error_code(NackError);
+          goto exit;
+        }
+      }
+      fifoData = i2cmFifo->rx;
+    } while (fifoData & MXC_S_I2CM_RSTLS_TAG_EMPTY);
+    data = fifoData & 0xFF;
+  }
+
+exit:
+  if (result) {
+    I2CM_Recover(i2cm);
+  }
+  return result;
+}
+
+} // namespace mxc
+} // namespace MaximInterface