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Renamed header file, updated header filename in interface files, sources, and CmakeLists file. Signed-off-by: Noel Eck <noel.eck@intel.com>
166 lines
4.3 KiB
C++
166 lines
4.3 KiB
C++
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <time.h>
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#include <stdexcept>
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#include "ds2413.hpp"
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using namespace upm;
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using namespace std;
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DS2413::DS2413(int uart) :
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m_uart(uart)
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{
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m_devicesFound = 0;
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// check basic access to the 1-wire bus (presence detect)
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mraa::Result rv;
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if ((rv = m_uart.reset()) != mraa::SUCCESS)
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{
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throw std::runtime_error(std::string(__FUNCTION__) +
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": reset() failed, no devices on bus?");
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return;
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}
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}
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DS2413::~DS2413()
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{
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}
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void DS2413::init()
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{
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// iterate through the bus and build up a list of detected DS2413
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// devices (only)
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// empty the map, in case this method has already been run once
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// before
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m_devicesFound = 0;
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m_deviceMap.clear();
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// start the search from scratch
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string id = m_uart.search(true);
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if (id.empty())
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{
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throw std::runtime_error(std::string(__FUNCTION__) +
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": no devices detected on bus");
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return;
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}
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while (!id.empty())
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{
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// The first byte (id[0]]) is the device type (family) code. We
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// are only interested in the family code for this device (0x3a).
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if ((uint8_t)id[0] == DS2413_FAMILY_CODE)
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{
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// we have a winner, add it to our map and continue searching
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m_deviceMap[m_devicesFound] = id;
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m_devicesFound++;
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}
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// continue search
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id = m_uart.search(false);
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}
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if (!m_devicesFound)
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{
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throw std::runtime_error(std::string(__FUNCTION__) +
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": no DS2413 devices found on bus");
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return;
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}
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}
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int DS2413::readGpios(int index)
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{
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if (index < 0 || index >= m_devicesFound)
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{
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throw std::out_of_range(std::string(__FUNCTION__) +
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": device index out of range");
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return 0;
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}
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m_uart.command(ACCESS_READ, m_deviceMap[index]);
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uint8_t value = m_uart.readByte();
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// Validity is performed by taking the high nibble, inverting it, and
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// copmpating it to the low nibble. If they are equal, then the
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// data is good.
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if ( (value & 0x0f) != ((~value >> 4) & 0x0f) )
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{
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throw std::runtime_error(std::string(__FUNCTION__) +
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": returned value failed integrity check");
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return 0;
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}
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m_uart.reset();
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// Only the 4 lsb's are relevant
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return (value & 0x0f);
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}
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void DS2413::writeGpios(int index, int value)
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{
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if (index < 0 || index >= m_devicesFound)
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{
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throw std::out_of_range(std::string(__FUNCTION__) +
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": device index out of range");
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return;
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}
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// mask out everything but the first 2 bits
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uint8_t val = (uint8_t)value & 0x03;
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// the value must have the upper 8 bits written set to 1's
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val |= 0xfc;
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m_uart.command(ACCESS_WRITE, m_deviceMap[index]);
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// first we write the new value, then the inverted value
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m_uart.writeByte(val);
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m_uart.writeByte(~val);
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// now we read back a response indicating success or failure
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uint8_t resp = m_uart.readByte();
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if (resp != ACK_SUCCESS)
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{
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throw std::runtime_error(std::string(__FUNCTION__) +
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": failed response validation");
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return;
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}
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m_uart.reset();
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return;
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}
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