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i2c_ov7725_rgb565_cfg.v
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//****************************************Copyright (c)***********************************//
//技术支持：www.openedv.com
//淘宝店铺：http://openedv.taobao.com
//关注微信公众平台微信号："正点原子"，免费获取FPGA & STM32资料。
//版权所有，盗版必究。
//Copyright(C) 正点原子 2018-2028
//All rights reserved
//----------------------------------------------------------------------------------------
// File name: i2c_ov7725_rgb565_cfg
// Last modified Date: 2018/3/21 14:26:05
// Last Version: V1.0
// Descriptions: i2c配置
//----------------------------------------------------------------------------------------
// Created by: 正点原子
// Created date: 2018/3/21 14:26:05
// Version: V1.0
// Descriptions: The original version
//
//----------------------------------------------------------------------------------------
//****************************************************************************************//
module i2c_ov7725_rgb565_cfg(
input clk , //时钟信号
input rst_n , //复位信号，低电平有效
input i2c_done , //I2C寄存器配置完成信号
output reg i2c_exec , //I2C触发执行信号
output reg [15:0] i2c_data , //I2C要配置的地址与数据(高8位地址,低8位数据)
output reg init_done //初始化完成信号
);
//parameter define
parameter REG_NUM = 7'd70 ; //总共需要配置的寄存器个数
//reg define
reg [9:0] start_init_cnt; //等待延时计数器
reg [6:0] init_reg_cnt ; //寄存器配置个数计数器
//*****************************************************
//** main code
//*****************************************************
//cam_scl配置成250khz,输入的clk为1Mhz,周期为1us,1023*1us = 1.023ms
//寄存器延时配置
always @(posedge clk or negedge rst_n) begin
if(!rst_n)
start_init_cnt <= 10'b0;
else if((init_reg_cnt == 7'd1) && i2c_done)
start_init_cnt <= 10'b0;
else if(start_init_cnt < 10'd1023) begin
start_init_cnt <= start_init_cnt + 1'b1;
end
end
//寄存器配置个数计数
always @(posedge clk or negedge rst_n) begin
if(!rst_n)
init_reg_cnt <= 7'd0;
else if(i2c_exec)
init_reg_cnt <= init_reg_cnt + 7'b1;
end
//i2c触发执行信号
always @(posedge clk or negedge rst_n) begin
if(!rst_n)
i2c_exec <= 1'b0;
else if(start_init_cnt == 10'd1022)
i2c_exec <= 1'b1;
//只有刚上电和配置第一个寄存器增加延时
else if(i2c_done && (init_reg_cnt != 7'd1) && (init_reg_cnt < REG_NUM))
i2c_exec <= 1'b1;
else
i2c_exec <= 1'b0;
end
//初始化完成信号
always @(posedge clk or negedge rst_n) begin
if(!rst_n)
init_done <= 1'b0;
else if((init_reg_cnt == REG_NUM) && i2c_done)
init_done <= 1'b1;
end
//配置寄存器地址与数据
always @(posedge clk or negedge rst_n) begin
if(!rst_n)
i2c_data <= 16'b0;
else begin
case(init_reg_cnt)
//先对寄存器进行软件复位，使寄存器恢复初始值
//寄存器软件复位后，需要延时1ms才能配置其它寄存器
7'd0 : i2c_data <= {8'h12, 8'h80}; //COM7 BIT[7]:复位所有的寄存器
7'd1 : i2c_data <= {8'h3d, 8'h03}; //COM12 模拟过程直流补偿
7'd2 : i2c_data <= {8'h15, 8'h00}; //COM10 href/vsync/pclk/data信号控制
7'd3 : i2c_data <= {8'h17, 8'h26}; //HSTART 水平起始位置
7'd4 : i2c_data <= {8'h18, 8'ha0}; //HSIZE 水平尺寸
7'd5 : i2c_data <= {8'h19, 8'h07}; //VSTRT 垂直起始位置
7'd6 : i2c_data <= {8'h1a, 8'hf0}; //VSIZE 垂直尺寸
7'd7 : i2c_data <= {8'h32, 8'h00}; //HREF 图像开始和尺寸控制，控制低位
7'd8 : i2c_data <= {8'h29, 8'ha0}; //HOutSize 水平输出尺寸
7'd9 : i2c_data <= {8'h2a, 8'h00}; //EXHCH 虚拟像素MSB
7'd10 : i2c_data <= {8'h2b, 8'h00}; //EXHCL 虚拟像素LSB
7'd11 : i2c_data <= {8'h2c, 8'hf0}; //VOutSize 垂直输出尺寸
7'd12 : i2c_data <= {8'h0d, 8'h41}; //COM4 PLL倍频设置(multiplier)
//Bit[7:6]: 0:1x 1:4x 2:6x 3:8x
7'd13 : i2c_data <= {8'h11, 8'h00}; //CLKRC 内部时钟配置
//Freq=multiplier/[(CLKRC[5:0]+1)*2]
7'd14 : i2c_data <= {8'h12, 8'h06}; //COM7 输出VGA RGB565格式
7'd15 : i2c_data <= {8'h0c, 8'h10}; //COM3 Bit[0]: 0:图像数据 1:彩条测试
//DSP 控制
7'd16 : i2c_data <= {8'h42, 8'h7f}; //TGT_B 黑电平校准蓝色通道目标值
7'd17 : i2c_data <= {8'h4d, 8'h09}; //FixGain 模拟增益放大器
7'd18 : i2c_data <= {8'h63, 8'hf0}; //AWB_Ctrl0 自动白平衡控制字节0
7'd19 : i2c_data <= {8'h64, 8'hff}; //DSP_Ctrl1 DSP控制字节1
7'd20 : i2c_data <= {8'h65, 8'h00}; //DSP_Ctrl2 DSP控制字节2
7'd21 : i2c_data <= {8'h66, 8'h00}; //DSP_Ctrl3 DSP控制字节3
7'd22 : i2c_data <= {8'h67, 8'h00}; //DSP_Ctrl4 DSP控制字节4
//AGC AEC AWB
//COM8 Bit[2]:自动增益使能 Bit[1]:自动白平衡使能 Bit[0]:自动曝光功能
7'd23 : i2c_data <= {8'h13, 8'hff}; //COM8
7'd24 : i2c_data <= {8'h0f, 8'hc5}; //COM6
7'd25 : i2c_data <= {8'h14, 8'h11};
7'd26 : i2c_data <= {8'h22, 8'h98};
7'd27 : i2c_data <= {8'h23, 8'h03};
7'd28 : i2c_data <= {8'h24, 8'h40};
7'd29 : i2c_data <= {8'h25, 8'h30};
7'd30: i2c_data <= {8'h26, 8'ha1};
7'd31: i2c_data <= {8'h6b, 8'haa};
7'd32: i2c_data <= {8'h13, 8'hff};
//matrix sharpness brightness contrast UV
7'd33 : i2c_data <= {8'h90, 8'h0a}; //EDGE1 边缘增强控制1
//DNSOff 降噪阈值下限,仅在自动模式下有效
7'd34 : i2c_data <= {8'h91, 8'h01}; //DNSOff
7'd35 : i2c_data <= {8'h92, 8'h01}; //EDGE2 锐度(边缘增强)强度上限
7'd36 : i2c_data <= {8'h93, 8'h01}; //EDGE3 锐度(边缘增强)强度下限
7'd37 : i2c_data <= {8'h94, 8'h5f}; //MTX1 矩阵系数1
7'd38 : i2c_data <= {8'h95, 8'h53}; //MTX1 矩阵系数2
7'd39 : i2c_data <= {8'h96, 8'h11}; //MTX1 矩阵系数3
7'd40 : i2c_data <= {8'h97, 8'h1a}; //MTX1 矩阵系数4
7'd41 : i2c_data <= {8'h98, 8'h3d}; //MTX1 矩阵系数5
7'd42 : i2c_data <= {8'h99, 8'h5a}; //MTX1 矩阵系数6
7'd43 : i2c_data <= {8'h9a, 8'h1e}; //MTX_Ctrl 矩阵控制
7'd44 : i2c_data <= {8'h9b, 8'h3f}; //BRIGHT 亮度
7'd45 : i2c_data <= {8'h9c, 8'h25}; //CNST 对比度
7'd46 : i2c_data <= {8'h9e, 8'h81};
7'd47 : i2c_data <= {8'ha6, 8'h06}; //SDE 特殊数字效果控制
7'd48 : i2c_data <= {8'ha7, 8'h65}; //USAT "U"饱和增益
7'd49 : i2c_data <= {8'ha8, 8'h65}; //VSAT "V"饱和增益
7'd50 : i2c_data <= {8'ha9, 8'h80}; //VSAT "V"饱和增益
7'd51 : i2c_data <= {8'haa, 8'h80}; //VSAT "V"饱和增益
//伽马控制
7'd52 : i2c_data <= {8'h7e, 8'h0c};
7'd53 : i2c_data <= {8'h7f, 8'h16};
7'd54 : i2c_data <= {8'h80, 8'h2a};
7'd55 : i2c_data <= {8'h81, 8'h4e};
7'd56 : i2c_data <= {8'h82, 8'h61};
7'd57 : i2c_data <= {8'h83, 8'h6f};
7'd58 : i2c_data <= {8'h84, 8'h7b};
7'd59 : i2c_data <= {8'h85, 8'h86};
7'd60 : i2c_data <= {8'h86, 8'h8e};
7'd61 : i2c_data <= {8'h87, 8'h97};
7'd62 : i2c_data <= {8'h88, 8'ha4};
7'd63 : i2c_data <= {8'h89, 8'haf};
7'd64 : i2c_data <= {8'h8a, 8'hc5};
7'd65 : i2c_data <= {8'h8b, 8'hd7};
7'd66 : i2c_data <= {8'h8c, 8'he8};
7'd67 : i2c_data <= {8'h8d, 8'h20};
7'd68 : i2c_data <= {8'h0e, 8'h65}; //COM5
7'd69 : i2c_data <= {8'h09, 8'h00}; //COM2 Bit[1:0] 输出电流驱动能力
//只读存储器,防止在case中没有列举的情况，之前的寄存器被重复改写
default:i2c_data <= {8'h1C, 8'h7F}; //MIDH 制造商ID 高8位
endcase
end
end
endmodule