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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2021, Raspberry Pi Ltd
*
* camera information for ov7251 sensor
*/
#include <assert.h>
#include "cam_helper.h"
using namespace RPiController;
class CamHelperOv7251 : public CamHelper
{
public:
CamHelperOv7251();
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;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 4;
};
/*
* OV7251 doesn't output metadata, so we have to use the "unicam parser" which
* works by counting frames.
*/
CamHelperOv7251::CamHelperOv7251()
: CamHelper({}, frameIntegrationDiff)
{
}
uint32_t CamHelperOv7251::gainCode(double gain) const
{
return static_cast<uint32_t>(gain * 16.0);
}
double CamHelperOv7251::gain(uint32_t gainCode) const
{
return static_cast<double>(gainCode) / 16.0;
}
void CamHelperOv7251::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const
{
/* The driver appears to behave as follows: */
exposureDelay = 2;
gainDelay = 2;
vblankDelay = 2;
hblankDelay = 2;
}
static CamHelper *create()
{
return new CamHelperOv7251();
}
static RegisterCamHelper reg("ov7251", &create);
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