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esp32-camera/sensors/ov7670.c

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/*
* This file is part of the OpenMV project.
* author: Juan Schiavoni <juanjoseschiavoni@hotmail.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 "ov7670.h"
#include "ov7670_regs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <stdio.h>
#if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
#include "esp32-hal-log.h"
#else
#include "esp_log.h"
static const char* TAG = "ov7760";
#endif
static int ov7670_clkrc = 0x01;
/*
* The default register settings, as obtained from OmniVision. There
* is really no making sense of most of these - lots of "reserved" values
* and such.
*
* These settings give VGA YUYV.
*/
struct regval_list {
uint8_t reg_num;
uint8_t value;
};
static struct regval_list ov7670_default_regs[] = {
/* Sensor automatically sets output window when resolution changes. */
{TSLB, 0x04},
/* Frame rate 30 fps at 12 Mhz clock */
{CLKRC, 0x00},
{DBLV, 0x4A},
{COM10, COM10_VSYNC_NEG | COM10_PCLK_MASK},
/* Improve white balance */
{COM4, 0x40},
/* Improve color */
{RSVD_B0, 0x84},
/* Enable 50/60 Hz auto detection */
{COM11, COM11_EXP|COM11_HZAUTO},
/* Disable some delays */
{HSYST, 0},
{HSYEN, 0},
{MVFP, MVFP_SUN},
/* More reserved magic, some of which tweaks white balance */
{AWBC1, 0x0a},
{AWBC2, 0xf0},
{AWBC3, 0x34},
{AWBC4, 0x58},
{AWBC5, 0x28},
{AWBC6, 0x3a},
{AWBCTR3, 0x0a},
{AWBCTR2, 0x55},
{AWBCTR1, 0x11},
{AWBCTR0, 0x9e},
{COM8, COM8_FAST_AUTO|COM8_STEP_UNLIMIT|COM8_AGC_EN|COM8_AEC_EN|COM8_AWB_EN},
/* End marker is FF because in ov7670 the address of GAIN 0 and default value too. */
{0xFF, 0xFF},
};
static struct regval_list ov7670_fmt_yuv422[] = {
{ COM7, 0x0 }, /* Selects YUV mode */
{ RGB444, 0 }, /* No RGB444 please */
{ COM1, 0 }, /* CCIR601 */
{ COM15, COM15_R00FF },
{ MVFP, MVFP_SUN },
{ COM9, 0x6A }, /* 128x gain ceiling; 0x8 is reserved bit */
{ MTX1, 0x80 }, /* "matrix coefficient 1" */
{ MTX2, 0x80 }, /* "matrix coefficient 2" */
{ MTX3, 0 }, /* vb */
{ MTX4, 0x22 }, /* "matrix coefficient 4" */
{ MTX5, 0x5e }, /* "matrix coefficient 5" */
{ MTX6, 0x80 }, /* "matrix coefficient 6" */
{ COM13, COM13_UVSAT },
{ 0xff, 0xff }, /* END MARKER */
};
static struct regval_list ov7670_fmt_rgb565[] = {
{ COM7, COM7_FMT_RGB565 }, /* Selects RGB mode */
{ RGB444, 0 }, /* No RGB444 please */
{ COM1, 0x0 }, /* CCIR601 */
{ COM15, COM15_RGB565 |COM15_R00FF },
{ MVFP, MVFP_SUN },
{ COM9, 0x6A }, /* 128x gain ceiling; 0x8 is reserved bit */
{ MTX1, 0xb3 }, /* "matrix coefficient 1" */
{ MTX2, 0xb3 }, /* "matrix coefficient 2" */
{ MTX3, 0 }, /* vb */
{ MTX4, 0x3d }, /* "matrix coefficient 4" */
{ MTX5, 0xa7 }, /* "matrix coefficient 5" */
{ MTX6, 0xe4 }, /* "matrix coefficient 6" */
{ COM13, COM13_UVSAT },
{ 0xff, 0xff }, /* END MARKER */
};
static struct regval_list ov7670_vga[] = {
{ COM3, 0x00 },
{ COM14, 0x00 },
{ SCALING_XSC, 0x3A },
{ SCALING_YSC, 0x35 },
{ SCALING_DCWCTR, 0x11 },
{ SCALING_PCLK_DIV, 0xF0 },
{ SCALING_PCLK_DELAY, 0x02 },
{ 0xff, 0xff },
};
static struct regval_list ov7670_qvga[] = {
{ COM3, 0x04 },
{ COM14, 0x19 },
{ SCALING_XSC, 0x3A },
{ SCALING_YSC, 0x35 },
{ SCALING_DCWCTR, 0x11 },
{ SCALING_PCLK_DIV, 0xF1 },
{ SCALING_PCLK_DELAY, 0x02 },
{ 0xff, 0xff },
};
static struct regval_list ov7670_qqvga[] = {
{ COM3, 0x04 }, //DCW enable
{ COM14, 0x1a }, //pixel clock divided by 4, manual scaling enable, DCW and PCLK controlled by register
{ SCALING_XSC, 0x3a },
{ SCALING_YSC, 0x35 },
{ SCALING_DCWCTR, 0x22 }, //downsample by 4
{ SCALING_PCLK_DIV, 0xf2 }, //pixel clock divided by 4
{ SCALING_PCLK_DELAY, 0x02 },
{ 0xff, 0xff },
};
/*
* Write a list of register settings; ff/ff stops the process.
*/
static int ov7670_write_array(sensor_t *sensor, struct regval_list *vals)
{
int ret = 0;
while ( (vals->reg_num != 0xff || vals->value != 0xff) && (ret == 0) ) {
ret = SCCB_Write(sensor->slv_addr, vals->reg_num, vals->value);
ESP_LOGD(TAG, "reset reg %02X, W(%02X) R(%02X)", vals->reg_num,
vals->value, SCCB_Read(sensor->slv_addr, vals->reg_num) );
vals++;
}
return ret;
}
/*
* Calculate the frame control registers.
*/
static int ov7670_frame_control(sensor_t *sensor, int hstart, int hstop, int vstart, int vstop)
{
struct regval_list frame[7];
frame[0].reg_num = HSTART;
frame[0].value = (hstart >> 3);
frame[1].reg_num = HSTOP;
frame[1].value = (hstop >> 3);
frame[2].reg_num = HREF;
frame[2].value = (((hstop & 0x07) << 3) | (hstart & 0x07));
frame[3].reg_num = VSTART;
frame[3].value = (vstart >> 2);
frame[4].reg_num = VSTOP;
frame[4].value = (vstop >> 2);
frame[5].reg_num = VREF;
frame[5].value = (((vstop & 0x02) << 2) | (vstart & 0x02));
/* End mark */
frame[5].reg_num = 0xFF;
frame[5].value = 0xFF;
return ov7670_write_array(sensor, frame);
}
static int reset(sensor_t *sensor)
{
int ret;
// Reset all registers
SCCB_Write(sensor->slv_addr, COM7, COM7_RESET);
// Delay 10 ms
vTaskDelay(10 / portTICK_PERIOD_MS);
ret = ov7670_write_array(sensor, ov7670_default_regs);
// Delay
vTaskDelay(30 / portTICK_PERIOD_MS);
return ret;
}
static int set_pixformat(sensor_t *sensor, pixformat_t pixformat)
{
int ret;
switch (pixformat) {
case PIXFORMAT_RGB565:
case PIXFORMAT_RGB888:
ret = ov7670_write_array(sensor, ov7670_fmt_rgb565);
break;
case PIXFORMAT_YUV422:
case PIXFORMAT_GRAYSCALE:
default:
ret = ov7670_write_array(sensor, ov7670_fmt_yuv422);
break;
}
vTaskDelay(30 / portTICK_PERIOD_MS);
/*
* If we're running RGB565, we must rewrite clkrc after setting
* the other parameters or the image looks poor. If we're *not*
* doing RGB565, we must not rewrite clkrc or the image looks
* *really* poor.
*
* (Update) Now that we retain clkrc state, we should be able
* to write it unconditionally, and that will make the frame
* rate persistent too.
*/
if (pixformat == PIXFORMAT_RGB565) {
ret = SCCB_Write(sensor->slv_addr, CLKRC, ov7670_clkrc);
}
return ret;
}
static int set_framesize(sensor_t *sensor, framesize_t framesize)
{
int ret;
// store clkrc before changing window settings...
ov7670_clkrc = SCCB_Read(sensor->slv_addr, CLKRC);
switch (framesize){
case FRAMESIZE_VGA:
if( (ret = ov7670_write_array(sensor, ov7670_vga)) == 0 ) {
/* These values from Omnivision */
ret = ov7670_frame_control(sensor, 158, 14, 10, 490);
}
break;
case FRAMESIZE_QVGA:
if( (ret = ov7670_write_array(sensor, ov7670_qvga)) == 0 ) {
/* These values from Omnivision */
ret = ov7670_frame_control(sensor, 158, 14, 10, 490);
}
break;
case FRAMESIZE_QQVGA:
if( (ret = ov7670_write_array(sensor, ov7670_qqvga)) == 0 ) {
/* These values from Omnivision */
ret = ov7670_frame_control(sensor, 158, 14, 10, 490);
}
break;
default:
ret = -1;
}
vTaskDelay(30 / portTICK_PERIOD_MS);
if (ret == 0) {
sensor->status.framesize = framesize;
}
return ret;
}
static int set_colorbar(sensor_t *sensor, int enable)
{
uint8_t ret = 0;
// Read register scaling_xsc
uint8_t reg = SCCB_Read(sensor->slv_addr, SCALING_XSC);
// Pattern to set color bar bit[0]=0 in every case
reg = SCALING_XSC_CBAR(reg);
// Write pattern to SCALING_XSC
ret = SCCB_Write(sensor->slv_addr, SCALING_XSC, reg);
// Read register scaling_ysc
reg = SCCB_Read(sensor->slv_addr, SCALING_YSC);
// Pattern to set color bar bit[0]=0 in every case
reg = SCALING_YSC_CBAR(reg, enable);
// Write pattern to SCALING_YSC
ret = ret | SCCB_Write(sensor->slv_addr, SCALING_YSC, reg);
// return 0 or 0xFF
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 MVFP
uint8_t reg = SCCB_Read(sensor->slv_addr, MVFP);
// Set mirror on/off
reg = MVFP_SET_MIRROR(reg, enable);
// Write back register MVFP
return SCCB_Write(sensor->slv_addr, MVFP, reg);
}
static int set_vflip(sensor_t *sensor, int enable)
{
// Read register MVFP
uint8_t reg = SCCB_Read(sensor->slv_addr, MVFP);
// Set mirror on/off
reg = MVFP_SET_FLIP(reg, enable);
// Write back register MVFP
return SCCB_Write(sensor->slv_addr, MVFP, reg);
}
static int init_status(sensor_t *sensor)
{
sensor->status.awb = 0;
sensor->status.aec = 0;
sensor->status.agc = 0;
sensor->status.hmirror = 0;
sensor->status.vflip = 0;
sensor->status.colorbar = 0;
return 0;
}
static int set_dummy(sensor_t *sensor, int val){ return -1; }
static int set_gainceiling_dummy(sensor_t *sensor, gainceiling_t val){ return -1; }
int ov7670_detect(int slv_addr, sensor_id_t *id)
{
if (OV7670_SCCB_ADDR == slv_addr) {
SCCB_Write(slv_addr, 0xFF, 0x01);//bank sensor
uint16_t PID = SCCB_Read(slv_addr, 0x0A);
if (OV7670_PID == PID) {
id->PID = PID;
id->VER = SCCB_Read(slv_addr, REG_VER);
id->MIDL = SCCB_Read(slv_addr, REG_MIDL);
id->MIDH = SCCB_Read(slv_addr, REG_MIDH);
return PID;
} else {
ESP_LOGI(TAG, "Mismatch PID=0x%x", PID);
}
}
return 0;
}
int ov7670_init(sensor_t *sensor)
{
// Set function pointers
sensor->reset = reset;
sensor->init_status = init_status;
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;
//not supported
sensor->set_brightness= set_dummy;
sensor->set_saturation= set_dummy;
sensor->set_quality = set_dummy;
sensor->set_gainceiling = set_gainceiling_dummy;
sensor->set_aec2 = set_dummy;
sensor->set_aec_value = set_dummy;
sensor->set_special_effect = set_dummy;
sensor->set_wb_mode = set_dummy;
sensor->set_ae_level = set_dummy;
sensor->set_dcw = set_dummy;
sensor->set_bpc = set_dummy;
sensor->set_wpc = set_dummy;
sensor->set_awb_gain = set_dummy;
sensor->set_agc_gain = set_dummy;
sensor->set_raw_gma = set_dummy;
sensor->set_lenc = set_dummy;
sensor->set_sharpness = set_dummy;
sensor->set_denoise = set_dummy;
// 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);
ESP_LOGD(TAG, "OV7670 Attached");
return 0;
}