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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2021, Raspberry Pi Ltd
*
* cam_helper_imx290.cpp - camera helper for imx290 sensor
*/
#include <math.h>
#include "cam_helper.h"
using namespace RPiController;
class CamHelperImx290 : public CamHelper
{
public:
CamHelperImx290();
uint32_t gainCode(double gain) const override;
double gain(uint32_t gainCode) const override;
void getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const override;
unsigned int hideFramesStartup() const override;
unsigned int hideFramesModeSwitch() const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 2;
};
CamHelperImx290::CamHelperImx290()
: CamHelper({}, frameIntegrationDiff)
{
}
uint32_t CamHelperImx290::gainCode(double gain) const
{
int code = 66.6667 * log10(gain);
return std::max(0, std::min(code, 0xf0));
}
double CamHelperImx290::gain(uint32_t gainCode) const
{
return pow(10, 0.015 * gainCode);
}
void CamHelperImx290::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const
{
exposureDelay = 2;
gainDelay = 2;
vblankDelay = 2;
hblankDelay = 2;
}
unsigned int CamHelperImx290::hideFramesStartup() const
{
/* On startup, we seem to get 1 bad frame. */
return 1;
}
unsigned int CamHelperImx290::hideFramesModeSwitch() const
{
/* After a mode switch, we seem to get 1 bad frame. */
return 1;
}
static CamHelper *create()
{
return new CamHelperImx290();
}
static RegisterCamHelper reg("imx290", &create);
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