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fpga: improve comments

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Signed-off-by: Niklas Eiling <niklas.eiling@eonerc.rwth-aachen.de>
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Niklas Eiling 2024-11-04 15:21:19 +01:00 • committed by Niklas Eiling
parent a7427d7cc0
commit e9b1a4a528
1 changed files with 5 additions and 4 deletions
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9
fpga/lib/ips/dino.cpp
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@ -140,7 +140,9 @@ void DinoAdc::configureHardware() {
void DinoAdc::setRegisterConfig(std::shared_ptr<Register> reg,
double sampleRate) {
constexpr double dinoClk = 25e6; // Dino is clocked with 25 Mhz
// constexpr double dinoDacDelay = 828e-9; // Delay for DAC to settle
// From the data sheets we can assume an analog delay of 828e-9s
// However this will eat into our computation time, so it should be
// configurable. Let's assume 0 until we implement this.
constexpr double dinoDacDelay = 0; // Delay for DAC to settle
constexpr size_t dinoRegisterTimer = 0;
constexpr size_t dinoRegisterAdcScale = 1;
@ -155,9 +157,8 @@ void DinoAdc::setRegisterConfig(std::shared_ptr<Register> reg,
uint32_t dinoTimerVal = static_cast<uint32_t>(dinoClk / sampleRate) - 1;
uint32_t dinoDacDelayCycles = static_cast<uint32_t>(dinoClk * dinoDacDelay);
double rateError = dinoClk / (dinoTimerVal + 1) - sampleRate;
reg->setRegister(
dinoRegisterTimer,
dinoTimerVal); // Timer value for generating ADC trigger signal
// Timer value for generating ADC trigger signal
reg->setRegister(dinoRegisterTimer, dinoTimerVal);
// The following are calibration values for the ADC and DAC. Scale
// sets an factor to be multiplied with the input value. This is the