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f95bae418c
s/Raspberry Pi (Trading) Limited/Raspberry Pi Ltd/ to reflect the new Raspberry Pi entity name. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2019, Raspberry Pi Ltd
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*
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* cam_helper_imx219.cpp - camera helper for imx219 sensor
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*/
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#include <assert.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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/*
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* We have observed that the imx219 embedded data stream randomly returns junk
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* register values. Do not rely on embedded data until this has been resolved.
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*/
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#define ENABLE_EMBEDDED_DATA 0
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#include "cam_helper.h"
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#if ENABLE_EMBEDDED_DATA
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#include "md_parser.h"
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#endif
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using namespace RPiController;
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/*
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* We care about one gain register and a pair of exposure registers. Their I2C
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* addresses from the Sony IMX219 datasheet:
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*/
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constexpr uint32_t gainReg = 0x157;
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constexpr uint32_t expHiReg = 0x15a;
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constexpr uint32_t expLoReg = 0x15b;
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constexpr uint32_t frameLengthHiReg = 0x160;
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constexpr uint32_t frameLengthLoReg = 0x161;
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constexpr std::initializer_list<uint32_t> registerList [[maybe_unused]]
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= { expHiReg, expLoReg, gainReg, frameLengthHiReg, frameLengthLoReg };
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class CamHelperImx219 : public CamHelper
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{
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public:
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CamHelperImx219();
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uint32_t gainCode(double gain) const override;
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double gain(uint32_t gainCode) const override;
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unsigned int mistrustFramesModeSwitch() const override;
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bool sensorEmbeddedDataPresent() const override;
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private:
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/*
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* Smallest difference between the frame length and integration time,
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* in units of lines.
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*/
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static constexpr int frameIntegrationDiff = 4;
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void populateMetadata(const MdParser::RegisterMap ®isters,
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Metadata &metadata) const override;
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};
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CamHelperImx219::CamHelperImx219()
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#if ENABLE_EMBEDDED_DATA
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: CamHelper(std::make_unique<MdParserSmia>(registerList), frameIntegrationDiff)
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#else
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: CamHelper({}, frameIntegrationDiff)
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#endif
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{
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}
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uint32_t CamHelperImx219::gainCode(double gain) const
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{
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return (uint32_t)(256 - 256 / gain);
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}
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double CamHelperImx219::gain(uint32_t gainCode) const
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{
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return 256.0 / (256 - gainCode);
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}
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unsigned int CamHelperImx219::mistrustFramesModeSwitch() const
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{
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/*
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* For reasons unknown, we do occasionally get a bogus metadata frame
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* at a mode switch (though not at start-up). Possibly warrants some
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* investigation, though not a big deal.
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*/
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return 1;
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}
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bool CamHelperImx219::sensorEmbeddedDataPresent() const
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{
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return ENABLE_EMBEDDED_DATA;
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}
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void CamHelperImx219::populateMetadata(const MdParser::RegisterMap ®isters,
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Metadata &metadata) const
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{
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DeviceStatus deviceStatus;
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deviceStatus.shutterSpeed = exposure(registers.at(expHiReg) * 256 + registers.at(expLoReg));
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deviceStatus.analogueGain = gain(registers.at(gainReg));
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deviceStatus.frameLength = registers.at(frameLengthHiReg) * 256 + registers.at(frameLengthLoReg);
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metadata.set("device.status", deviceStatus);
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}
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static CamHelper *create()
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{
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return new CamHelperImx219();
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}
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static RegisterCamHelper reg("imx219", &create);
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