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