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/*
* Copyright (c) 2019 Analog Devices Inc.
*
* This file is part of libm2k
* (see http://www.github.com/analogdevicesinc/libm2k).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <libm2k/m2k.hpp>
#include <libm2k/contextbuilder.hpp>
#include <libm2k/analog/m2kanalogin.hpp>
#include <libm2k/analog/m2kpowersupply.hpp>
#include <libm2k/digital/m2kdigital.hpp>
#include <libm2k/tools/spi.hpp>
#include <libm2k/tools/spi_extra.hpp>
#include <numeric>
#include <iostream>
/*
* Please check Electronics Lab 14 on our wiki page: https://wiki.analog.com/university/courses/electronics/electronics-lab-14
* Configure the connections for 'Unipolar output operation' mode
*/
#define VOLTAGE 2.5
void getRegisterData(double voltage, uint8_t *data)
{
//only positive values for voltage
if (voltage < 0) {
data[0] = 0;
data[1] = 0;
return;
}
//output voltage up to 4.095V
if (voltage > 4.095) {
data[0] = 0x0F;
data[1] = 0xFF;
return;
}
auto registerValue = (unsigned short) (voltage * 1000);
data[0] = (uint8_t) ((registerValue & 0xFF00u) >> 8u);
data[1] = (uint8_t) (registerValue & 0xFFu);
}
int main()
{
libm2k::context::M2k *context = libm2k::context::m2kOpen("ip:192.168.2.1");
if (!context) {
std::cout << "Connection Error: No ADALM2000 device available/connected to your PC.\n";
return -1;
}
context->calibrateADC();
libm2k::analog::M2kAnalogIn *analogIn = context->getAnalogIn();
libm2k::analog::M2kPowerSupply *powerSupply = context->getPowerSupply();
libm2k::digital::M2kDigital *digital = context->getDigital();
//setup analog in
analogIn->setOversamplingRatio(1);
analogIn->setSampleRate(1000000);
analogIn->enableChannel(0, true);
analogIn->enableChannel(1, false);
analogIn->setRange(libm2k::analog::ANALOG_IN_CHANNEL_1, libm2k::analog::PLUS_MINUS_25V);
//enable LDAC
digital->setDirection(3, libm2k::digital::DIO_OUTPUT);
digital->enableChannel(3, true);
//enable CLR
digital->setDirection(4, libm2k::digital::DIO_OUTPUT);
digital->enableChannel(4, true);
//setup SPI
m2k_spi_init m2KSpiInit;
m2KSpiInit.clock = 1;
m2KSpiInit.mosi = 2;
m2KSpiInit.miso = 7; //dummy value - miso is not used in this example
m2KSpiInit.bit_numbering = MSB;
m2KSpiInit.cs_polarity = ACTIVE_LOW;
m2KSpiInit.context = context;
spi_init_param spiInitParam;
spiInitParam.max_speed_hz = 1000000;
spiInitParam.mode = SPI_MODE_3;
spiInitParam.chip_select = 0;
spiInitParam.extra = (void*)&m2KSpiInit;
spi_desc *desc = nullptr;
if (spi_init(&desc, &spiInitParam) == -1) {
std::cout << "SPI Error: Could not configure SPI\n";
return -1;
}
powerSupply->enableChannel(0, true);
powerSupply->pushChannel(0, 5);
//CLR and LDAC high as long as bits are transmitted
digital->setValueRaw(3, libm2k::digital::HIGH);
digital->setValueRaw(4, libm2k::digital::HIGH);
uint8_t data[2];
getRegisterData(VOLTAGE, data);
//transmitting data
if (spi_write_and_read(desc, data, 2) == -1) {
std::cout << "SPI Error: Could not transmit the data\n";
return -1;
}
//update with current shift register contents
digital->setValueRaw(3, libm2k::digital::LOW);
std::vector<std::vector<double>> samples = analogIn->getSamples(100);
double average = std::accumulate(samples[0].begin(), samples[0].end(), 0.0) / samples[0].size();
std::cout << "Average value: " << average << " V" << std::endl;
spi_remove(desc);
libm2k::context::contextClose(context, true);
return 0;
}
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