Initial Import
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me-no-dev
309
sensors/ov7725.c
Executable file
309
sensors/ov7725.c
Executable file
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/*
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* This file is part of the OpenMV project.
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* Copyright (c) 2013/2014 Ibrahim Abdelkader <i.abdalkader@gmail.com>
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* This work is licensed under the MIT license, see the file LICENSE for details.
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*
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* OV7725 driver.
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "sccb.h"
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#include "ov7725.h"
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#include "ov7725_regs.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#if defined(ARDUINO_ARCH_ESP32) && defined(CONFIG_ARDUHAL_ESP_LOG)
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#include "esp32-hal-log.h"
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#else
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#include "esp_log.h"
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static const char* TAG = "ov7725";
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#endif
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static const uint8_t default_regs[][2] = {
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{COM3, COM3_SWAP_YUV},
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{COM7, COM7_RES_QVGA | COM7_FMT_YUV},
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{COM4, 0x01}, /* bypass PLL */
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{CLKRC, 0xC0}, /* Res/Bypass pre-scalar */
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// QVGA Window Size
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{HSTART, 0x3F},
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{HSIZE, 0x50},
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{VSTART, 0x03},
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{VSIZE, 0x78},
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{HREF, 0x00},
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// Scale down to QVGA Resolution
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{HOUTSIZE, 0x50},
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{VOUTSIZE, 0x78},
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{COM12, 0x03},
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{EXHCH, 0x00},
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{TGT_B, 0x7F},
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{FIXGAIN, 0x09},
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{AWB_CTRL0, 0xE0},
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{DSP_CTRL1, 0xFF},
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{DSP_CTRL2, DSP_CTRL2_VDCW_EN | DSP_CTRL2_HDCW_EN | DSP_CTRL2_HZOOM_EN | DSP_CTRL2_VZOOM_EN},
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{DSP_CTRL3, 0x00},
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{DSP_CTRL4, 0x00},
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{DSPAUTO, 0xFF},
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{COM8, 0xF0},
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{COM6, 0xC5},
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{COM9, 0x11},
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{COM10, COM10_VSYNC_NEG | COM10_PCLK_MASK}, //Invert VSYNC and MASK PCLK
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{BDBASE, 0x7F},
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{DBSTEP, 0x03},
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{AEW, 0x96},
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{AEB, 0x64},
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{VPT, 0xA1},
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{EXHCL, 0x00},
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{AWB_CTRL3, 0xAA},
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{COM8, 0xFF},
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//Gamma
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{GAM1, 0x0C},
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{GAM2, 0x16},
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{GAM3, 0x2A},
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{GAM4, 0x4E},
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{GAM5, 0x61},
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{GAM6, 0x6F},
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{GAM7, 0x7B},
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{GAM8, 0x86},
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{GAM9, 0x8E},
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{GAM10, 0x97},
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{GAM11, 0xA4},
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{GAM12, 0xAF},
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{GAM13, 0xC5},
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{GAM14, 0xD7},
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{GAM15, 0xE8},
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{SLOP, 0x20},
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{EDGE1, 0x05},
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{EDGE2, 0x03},
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{EDGE3, 0x00},
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{DNSOFF, 0x01},
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{MTX1, 0xB0},
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{MTX2, 0x9D},
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{MTX3, 0x13},
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{MTX4, 0x16},
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{MTX5, 0x7B},
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{MTX6, 0x91},
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{MTX_CTRL, 0x1E},
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{BRIGHTNESS, 0x08},
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{CONTRAST, 0x30},
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{UVADJ0, 0x81},
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{SDE, (SDE_CONT_BRIGHT_EN | SDE_SATURATION_EN)},
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// For 30 fps/60Hz
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{DM_LNL, 0x00},
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{DM_LNH, 0x00},
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{BDBASE, 0x7F},
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{DBSTEP, 0x03},
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// Lens Correction, should be tuned with real camera module
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{LC_RADI, 0x10},
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{LC_COEF, 0x10},
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{LC_COEFB, 0x14},
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{LC_COEFR, 0x17},
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{LC_CTR, 0x05},
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{COM5, 0xF5}, //0x65
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{0x00, 0x00},
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};
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static int reset(sensor_t *sensor)
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{
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int i=0;
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const uint8_t (*regs)[2];
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// Reset all registers
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SCCB_Write(sensor->slv_addr, COM7, COM7_RESET);
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// Delay 10 ms
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vTaskDelay(10 / portTICK_PERIOD_MS);
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// Write default regsiters
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for (i=0, regs = default_regs; regs[i][0]; i++) {
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SCCB_Write(sensor->slv_addr, regs[i][0], regs[i][1]);
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}
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// Delay
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vTaskDelay(30 / portTICK_PERIOD_MS);
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return 0;
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}
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static int set_pixformat(sensor_t *sensor, pixformat_t pixformat)
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{
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int ret=0;
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// Read register COM7
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM7);
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switch (pixformat) {
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case PIXFORMAT_RGB565:
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reg = COM7_SET_RGB(reg, COM7_FMT_RGB565);
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break;
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case PIXFORMAT_YUV422:
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case PIXFORMAT_GRAYSCALE:
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reg = COM7_SET_FMT(reg, COM7_FMT_YUV);
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break;
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default:
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return -1;
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}
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// Write back register COM7
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ret = SCCB_Write(sensor->slv_addr, COM7, reg);
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// Delay
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vTaskDelay(30 / portTICK_PERIOD_MS);
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return ret;
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}
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static int set_framesize(sensor_t *sensor, framesize_t framesize)
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{
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int ret=0;
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uint16_t w = resolution[framesize][0];
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uint16_t h = resolution[framesize][1];
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// Write MSBs
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ret |= SCCB_Write(sensor->slv_addr, HOUTSIZE, w>>2);
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ret |= SCCB_Write(sensor->slv_addr, VOUTSIZE, h>>1);
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// Write LSBs
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ret |= SCCB_Write(sensor->slv_addr, EXHCH, ((w&0x3) | ((h&0x1) << 2)));
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if (framesize < FRAMESIZE_VGA) {
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// Enable auto-scaling/zooming factors
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ret |= SCCB_Write(sensor->slv_addr, DSPAUTO, 0xFF);
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} else {
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// Disable auto-scaling/zooming factors
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ret |= SCCB_Write(sensor->slv_addr, DSPAUTO, 0xF3);
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// Clear auto-scaling/zooming factors
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ret |= SCCB_Write(sensor->slv_addr, SCAL0, 0x00);
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ret |= SCCB_Write(sensor->slv_addr, SCAL1, 0x00);
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ret |= SCCB_Write(sensor->slv_addr, SCAL2, 0x00);
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}
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// Delay
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vTaskDelay(30 / portTICK_PERIOD_MS);
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return ret;
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}
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static int set_colorbar(sensor_t *sensor, int enable)
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{
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int ret=0;
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uint8_t reg;
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// Read reg COM3
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reg = SCCB_Read(sensor->slv_addr, COM3);
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// Enable colorbar test pattern output
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reg = COM3_SET_CBAR(reg, enable);
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// Write back COM3
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ret |= SCCB_Write(sensor->slv_addr, COM3, reg);
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// Read reg DSP_CTRL3
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reg = SCCB_Read(sensor->slv_addr, DSP_CTRL3);
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// Enable DSP colorbar output
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reg = DSP_CTRL3_SET_CBAR(reg, enable);
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// Write back DSP_CTRL3
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ret |= SCCB_Write(sensor->slv_addr, DSP_CTRL3, reg);
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return ret;
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}
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static int set_whitebal(sensor_t *sensor, int enable)
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{
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// Read register COM8
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);
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// Set white bal on/off
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reg = COM8_SET_AWB(reg, enable);
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// Write back register COM8
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return SCCB_Write(sensor->slv_addr, COM8, reg);
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}
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static int set_gain_ctrl(sensor_t *sensor, int enable)
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{
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// Read register COM8
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);
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// Set white bal on/off
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reg = COM8_SET_AGC(reg, enable);
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// Write back register COM8
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return SCCB_Write(sensor->slv_addr, COM8, reg);
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}
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static int set_exposure_ctrl(sensor_t *sensor, int enable)
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{
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// Read register COM8
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM8);
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// Set white bal on/off
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reg = COM8_SET_AEC(reg, enable);
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// Write back register COM8
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return SCCB_Write(sensor->slv_addr, COM8, reg);
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}
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static int set_hmirror(sensor_t *sensor, int enable)
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{
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// Read register COM3
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM3);
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// Set mirror on/off
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reg = COM3_SET_MIRROR(reg, enable);
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// Write back register COM3
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return SCCB_Write(sensor->slv_addr, COM3, reg);
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}
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static int set_vflip(sensor_t *sensor, int enable)
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{
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// Read register COM3
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uint8_t reg = SCCB_Read(sensor->slv_addr, COM3);
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// Set mirror on/off
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reg = COM3_SET_FLIP(reg, enable);
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// Write back register COM3
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return SCCB_Write(sensor->slv_addr, COM3, reg);
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}
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int ov7725_init(sensor_t *sensor)
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{
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// Set function pointers
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sensor->reset = reset;
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sensor->set_pixformat = set_pixformat;
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sensor->set_framesize = set_framesize;
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sensor->set_colorbar = set_colorbar;
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sensor->set_whitebal = set_whitebal;
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sensor->set_gain_ctrl = set_gain_ctrl;
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sensor->set_exposure_ctrl = set_exposure_ctrl;
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sensor->set_hmirror = set_hmirror;
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sensor->set_vflip = set_vflip;
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// Retrieve sensor's signature
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sensor->id.MIDH = SCCB_Read(sensor->slv_addr, REG_MIDH);
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sensor->id.MIDL = SCCB_Read(sensor->slv_addr, REG_MIDL);
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sensor->id.PID = SCCB_Read(sensor->slv_addr, REG_PID);
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sensor->id.VER = SCCB_Read(sensor->slv_addr, REG_VER);
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return 0;
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}
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