/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2021, Raspberry Pi (Trading) Limited * * cam_helper_imx290.cpp - camera helper for imx290 sensor */ #include <math.h> #include "cam_helper.hpp" using namespace RPiController; class CamHelperImx290 : public CamHelper { public: CamHelperImx290(); uint32_t GainCode(double gain) const override; double Gain(uint32_t gain_code) const override; void GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) 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(nullptr, 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 gain_code) const { return pow(10, 0.015 * gain_code); } void CamHelperImx290::GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const { exposure_delay = 2; gain_delay = 2; vblank_delay = 2; } 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);