/**
* Set the sample rate on the module.
*
* This is a global setting for the module and effects all channels.
*
* @param samplesPerSecond The number of samples per channel per second.
*/
void AnalogModule::SetSampleRate(float samplesPerSecond)
{
// TODO: This will change when variable size scan lists are implemented.
// TODO: Need float comparison with epsilon.
//wpi_assert(!sampleRateSet || GetSampleRate() == samplesPerSecond);
m_sampleRateSet = true;
// Compute the convert rate
UINT32 ticksPerSample = (UINT32)((float)kTimebase / samplesPerSecond);
UINT32 ticksPerConversion = ticksPerSample / GetNumChannelsToActivate();
// ticksPerConversion must be at least 80
if (ticksPerConversion < 80)
{
wpi_fatal(SampleRateTooHigh);
ticksPerConversion = 80;
}
// Atomically set the scan size and the convert rate so that the sample rate is constant
tAI::tConfig config;
config.ScanSize = GetNumChannelsToActivate();
config.ConvertRate = ticksPerConversion;
m_module->writeConfig(config, &status);
// Indicate that the scan size has been commited to hardware.
SetNumChannelsToActivate(0);
wpi_assertCleanStatus(status);
}
/**
* Create a new instance of an analog module.
*
* Create an instance of the analog module object. Initialize all the parameters
* to reasonable values on start.
* Setting a global value on an analog module can be done only once unless subsequent
* values are set the previously set value.
* Analog modules are a singleton, so the constructor is never called outside of this class.
*
* @param slot The slot in the chassis that the module is plugged into.
*/
AnalogModule::AnalogModule(UINT32 slot)
: Module(slot)
, m_module (NULL)
, m_sampleRateSet (false)
, m_numChannelsToActivate (0)
{
status = 0;
AddToSingletonList();
m_module = new tAI(SlotToIndex(slot), &status);
SetNumChannelsToActivate(kAnalogChannels);
SetSampleRate(kDefaultSampleRate);
for (UINT32 i = 0; i < kAnalogChannels; i++)
{
m_module->writeScanList(i, i, &status);
SetAverageBits(i + 1, kDefaultAverageBits);
SetOversampleBits(i + 1, kDefaultOversampleBits);
}
if (m_registerWindowSemaphore == NULL)
{
// Needs to be global since the protected resource spans both module singletons.
m_registerWindowSemaphore = semMCreate(SEM_Q_PRIORITY | SEM_DELETE_SAFE | SEM_INVERSION_SAFE);
}
wpi_assertCleanStatus(status);
}
/**
* Create a new instance of an analog module.
*
* Create an instance of the analog module object. Initialize all the parameters
* to reasonable values on start.
* Setting a global value on an analog module can be done only once unless subsequent
* values are set the previously set value.
* Analog modules are a singleton, so the constructor is never called outside of this class.
*
* @param moduleNumber The analog module to create (1 or 2).
*/
AnalogModule::AnalogModule(UINT8 moduleNumber)
: Module(nLoadOut::kModuleType_Analog, moduleNumber)
, m_module (NULL)
, m_sampleRateSet (false)
, m_numChannelsToActivate (0)
{
AddToSingletonList();
tRioStatusCode localStatus = NiFpga_Status_Success;
m_module = tAI::create(m_moduleNumber - 1, &localStatus);
wpi_setError(localStatus);
SetNumChannelsToActivate(kAnalogChannels);
SetSampleRate(kDefaultSampleRate);
for (UINT32 i = 0; i < kAnalogChannels; i++)
{
m_module->writeScanList(i, i, &localStatus);
wpi_setError(localStatus);
SetAverageBits(i + 1, kDefaultAverageBits);
SetOversampleBits(i + 1, kDefaultOversampleBits);
}
if (m_registerWindowSemaphore == NULL)
{
// Needs to be global since the protected resource spans both module singletons.
m_registerWindowSemaphore = semMCreate(SEM_Q_PRIORITY | SEM_DELETE_SAFE | SEM_INVERSION_SAFE);
}
}