ov7725.c

/*
 * This file is part of the OpenMV project.
 * Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
 * This work is licensed under the MIT license, see the file LICENSE for details.
 *
 * OV7725 driver.
 *
 */
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "sccb.h"
#include "ov7725.h"
#include "ov7725_regs.h"
#include <stdio.h>

static const uint8_t default_regs[][2] = {
    {COM3,          COM3_SWAP_YUV},
    {COM7,          COM7_RES_QVGA | COM7_FMT_YUV},

    {COM4,          0x01}, /* bypass PLL */
    {CLKRC,         0xC0}, /* Res/Bypass pre-scalar */

    // QVGA Window Size
    {HSTART,        0x3F},
    {HSIZE,         0x50},
    {VSTART,        0x03},
    {VSIZE,         0x78},
    {HREF,          0x00},

    // Scale down to QVGA Resolution
    {HOUTSIZE,      0x50},
    {VOUTSIZE,      0x78},

    {COM12,         0x03},
    {EXHCH,         0x00},
    {TGT_B,         0x7F},
    {FIXGAIN,       0x09},
    {AWB_CTRL0,     0xE0},
    {DSP_CTRL1,     0xFF},

    {DSP_CTRL2,     DSP_CTRL2_VDCW_EN | DSP_CTRL2_HDCW_EN | DSP_CTRL2_HZOOM_EN | DSP_CTRL2_VZOOM_EN},

    {DSP_CTRL3,     0x00},
    {DSP_CTRL4,     0x00},
    {DSPAUTO,       0xFF},

    {COM8,          0xF0},
    {COM6,          0xC5},
    {COM9,          0x11},
    {COM10,         COM10_VSYNC_NEG | COM10_PCLK_MASK}, //Invert VSYNC and MASK PCLK
    {BDBASE,        0x7F},
    {DBSTEP,        0x03},
    {AEW,           0x96},
    {AEB,           0x64},
    {VPT,           0xA1},
    {EXHCL,         0x00},
    {AWB_CTRL3,     0xAA},
    {COM8,          0xFF},

    //Gamma
    {GAM1,          0x0C},
    {GAM2,          0x16},
    {GAM3,          0x2A},
    {GAM4,          0x4E},
    {GAM5,          0x61},
    {GAM6,          0x6F},
    {GAM7,          0x7B},
    {GAM8,          0x86},
    {GAM9,          0x8E},
    {GAM10,         0x97},
    {GAM11,         0xA4},
    {GAM12,         0xAF},
    {GAM13,         0xC5},
    {GAM14,         0xD7},
    {GAM15,         0xE8},

    {SLOP,          0x20},
    {EDGE1,         0x05},
    {EDGE2,         0x03},
    {EDGE3,         0x00},
    {DNSOFF,        0x01},

    {MTX1,          0xB0},
    {MTX2,          0x9D},
    {MTX3,          0x13},
    {MTX4,          0x16},
    {MTX5,          0x7B},
    {MTX6,          0x91},
    {MTX_CTRL,      0x1E},

    {BRIGHTNESS,    0x08},
    {CONTRAST,      0x30},
    {UVADJ0,        0x81},
    {SDE,           (SDE_CONT_BRIGHT_EN | SDE_SATURATION_EN)},

    // For 30 fps/60Hz
    {DM_LNL,        0x00},
    {DM_LNH,        0x00},
    {BDBASE,        0x7F},
    {DBSTEP,        0x03},

    // Lens Correction, should be tuned with real camera module
    {LC_RADI,       0x10},
    {LC_COEF,       0x10},
    {LC_COEFB,      0x14},
    {LC_COEFR,      0x17},
    {LC_CTR,        0x05},
    {COM5,          0xF5}, //0x65

    {0x00,          0x00},
};


static int reset(sensor_t *sensor)
{
    int i=0;
    const uint8_t (*regs)[2];

    // Reset all registers
    SCCB_Write(sensor->slv_addr, COM7, COM7_RESET);

    // Delay 10 ms
    systick_sleep(10);

    // Write default regsiters
    for (i=0, regs = default_regs; regs[i][0]; i++) {
        SCCB_Write(sensor->slv_addr, regs[i][0], regs[i][1]);
    }

    // Delay
    systick_sleep(30);

    return 0;
}


static int set_pixformat(sensor_t *sensor, pixformat_t pixformat)
{
    int ret=0;
    // Read register COM7
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM7);

    switch (pixformat) {
        case PIXFORMAT_RGB565:
            reg =  COM7_SET_FMT(reg, COM7_FMT_RGB) | COM7_FMT_RGB565;
            break;
        case PIXFORMAT_YUV422:
        case PIXFORMAT_GRAYSCALE:
            reg =  COM7_SET_FMT(reg, COM7_FMT_YUV);
            break;
        default:
            return -1;
    }

    // Write back register COM7
    ret = SCCB_Write(sensor->slv_addr, COM7, reg);

    // Delay
    systick_sleep(30);

    return ret;
}

static int set_framesize(sensor_t *sensor, framesize_t framesize)
{
    int ret=0;
    uint16_t w = resolution[framesize][0];
    uint16_t h = resolution[framesize][1];

    // Write MSBs
    ret |= SCCB_Write(sensor->slv_addr, HOUTSIZE, w>>2);
    ret |= SCCB_Write(sensor->slv_addr, VOUTSIZE, h>>1);

    // Write LSBs
    ret |= SCCB_Write(sensor->slv_addr, EXHCH, ((w&0x3) | ((h&0x1) << 2)));

    if (framesize < FRAMESIZE_VGA) {
        // Enable auto-scaling/zooming factors
        ret |= SCCB_Write(sensor->slv_addr, DSPAUTO, 0xFF);
    } else {
        // Disable auto-scaling/zooming factors
        ret |= SCCB_Write(sensor->slv_addr, DSPAUTO, 0xF3);

        // Clear auto-scaling/zooming factors
        ret |= SCCB_Write(sensor->slv_addr, SCAL0, 0x00);
        ret |= SCCB_Write(sensor->slv_addr, SCAL1, 0x00);
        ret |= SCCB_Write(sensor->slv_addr, SCAL2, 0x00);
    }

    // Delay
    systick_sleep(30);

    if (ret == 0) {
        sensor->framesize = framesize;
    }

    return ret;
}

static int set_colorbar(sensor_t *sensor, int enable)
{
    int ret=0;
    uint8_t reg;

    // Read reg COM3
    reg = SCCB_Read(sensor->slv_addr, COM3);
    // Enable colorbar test pattern output
    reg = COM3_SET_CBAR(reg, enable);
    // Write back COM3
    ret |= SCCB_Write(sensor->slv_addr, COM3, reg);

    // Read reg DSP_CTRL3
    reg = SCCB_Read(sensor->slv_addr, DSP_CTRL3);
    // Enable DSP colorbar output
    reg = DSP_CTRL3_SET_CBAR(reg, enable);
    // Write back DSP_CTRL3
    ret |= SCCB_Write(sensor->slv_addr, DSP_CTRL3, reg);

    return ret;
}

static int set_whitebal(sensor_t *sensor, int enable)
{
    // Read register COM8
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);

    // Set white bal on/off
    reg = COM8_SET_AWB(reg, enable);

    // Write back register COM8
    return SCCB_Write(sensor->slv_addr, COM8, reg);
}

static int set_gain_ctrl(sensor_t *sensor, int enable)
{
    // Read register COM8
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);

    // Set white bal on/off
    reg = COM8_SET_AGC(reg, enable);

    // Write back register COM8
    return SCCB_Write(sensor->slv_addr, COM8, reg);
}

static int set_exposure_ctrl(sensor_t *sensor, int enable)
{
    // Read register COM8
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);

    // Set white bal on/off
    reg = COM8_SET_AEC(reg, enable);

    // Write back register COM8
    return SCCB_Write(sensor->slv_addr, COM8, reg);
}

static int set_hmirror(sensor_t *sensor, int enable)
{
    // Read register COM3
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM3);

    // Set mirror on/off
    reg = COM3_SET_MIRROR(reg, enable);

    // Write back register COM3
    return SCCB_Write(sensor->slv_addr, COM3, reg);
}

static int set_vflip(sensor_t *sensor, int enable)
{
    // Read register COM3
    uint8_t reg = SCCB_Read(sensor->slv_addr, COM3);

    // Set mirror on/off
    reg = COM3_SET_FLIP(reg, enable);

    // Write back register COM3
    return SCCB_Write(sensor->slv_addr, COM3, reg);
}

int ov7725_init(sensor_t *sensor)
{
    // Set function pointers
    sensor->reset = reset;
    sensor->set_pixformat = set_pixformat;
    sensor->set_framesize = set_framesize;
    sensor->set_colorbar = set_colorbar;
    sensor->set_whitebal = set_whitebal;
    sensor->set_gain_ctrl = set_gain_ctrl;
    sensor->set_exposure_ctrl = set_exposure_ctrl;
    sensor->set_hmirror = set_hmirror;
    sensor->set_vflip = set_vflip;

    // Retrieve sensor's signature
    sensor->id.MIDH = SCCB_Read(sensor->slv_addr, REG_MIDH);
    sensor->id.MIDL = SCCB_Read(sensor->slv_addr, REG_MIDL);
    sensor->id.PID = SCCB_Read(sensor->slv_addr, REG_PID);
    sensor->id.VER = SCCB_Read(sensor->slv_addr, REG_VER);

    // Set sensor flags
    SENSOR_HW_FLAGS_SET(sensor, SENSOR_HW_FLAGS_VSYNC, 1);
    SENSOR_HW_FLAGS_SET(sensor, SENSOR_HW_FLAGS_HSYNC, 0);
    SENSOR_HW_FLAGS_SET(sensor, SENSOR_HW_FLAGS_PIXCK, 1);
    SENSOR_HW_FLAGS_SET(sensor, SENSOR_HW_FLAGS_FSYNC, 1);
    SENSOR_HW_FLAGS_SET(sensor, SENSOR_HW_FLAGS_JPEGE, 0);

    return 0;
}