FPGA配置OV5640摄像头及RGB图像数据采集 |
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本文设计思想采用明德扬至简设计法。在做摄像头数据采集处理之前,需要配置OV5640传感器内部寄存器使其按要求正常工作,详细内容请参见《OV5640自动对焦照相模组应用指南》。首先要关注OV5640的上电时序: 主控制器控制RESET PWDN两个信号按上电时序要求变化,之后允许ov_config模块配置内部寄存器。这里始终将PWDN拉低。实验中将摄像头分辨率设置为720p,即1280*720 ,帧率为30fps,图像输出格式是RGB565。此时摄像头输入时钟XCLK频率24MHz,输出像素时钟PCLK为84MHz。由于实验使用的是OV5640双目摄像头模组,且XCLK由外部24MHz晶振给出,故ov_config模块整体结构及端口定义如下: setup模块构造上电时序,两个reg_config分别配置一个OV5640摄像头。SCCB_interface子模块负责SCCB协议读写寄存器数据。由于OV5640摄像头内部寄存器地址为16位,因此写寄存器地址阶段分高低字节两次写入。datasheet中给出了OV5640的SCCB ID地址(写),故读ID地址为0X79。 SCCB时序图及AC characteristics如下: SCCB时钟SIOC支持最大频率为400KHz,一般选100KHz即可。以下是本人设计的SCCB接口读写时序状态机,写操作:IDLE START WRI_ID WRI_REG WRI_DATA STOP 对应三相写,读操作:IDLE START WRI_ID WRI_REG STOP START WRI_ID RD_DATA STOP对应两相写和两相读。 上代码: SCCB读写模块: 1 `timescale 1ns / 1ps 2 3 4 module sccb_interface( 5 input clk, 6 input rst_n, 7 8 input wr_en, 9 input rd_en, 10 input [8-1:0] id_addr, 11 input [16-1:0] reg_addr, 12 input [8-1:0] wr_data, 13 output reg [8-1:0] rd_data, 14 output reg rd_vld, 15 output rdy, 16 17 output reg sio_c, 18 output reg sio_out_en, 19 output reg sio_out, 20 input sio_in 21 ); 22 23 parameter CYC = 500; 24 25 26 localparam IDLE = 0 ; 27 localparam START = 1 ; 28 localparam WRI_ID = 2 ; 29 localparam WRI_REG = 3 ; 30 localparam WRI_DATA = 4; 31 localparam RD_DATA = 5; 32 localparam STOP = 6 ; 33 34 //计数器 35 reg [ (9-1):0] div_cnt ; 36 wire add_div_cnt ; 37 wire end_div_cnt ; 38 reg [ (5-1):0] bit_cnt ; 39 wire add_bit_cnt ; 40 wire end_bit_cnt ; 41 reg [5-1:0] N; 42 (*DONT_TOUCH = "TRUE"*)reg [7-1:0] state_c,state_n; 43 wire idle2start,start2wri_id,wri_id2wri_reg,wri_id2rd_data, wri_reg2wri_data,wri_reg2stop,wri_data2stop,rd_data2stop,stop2start,stop2idle; 44 wire [18-1:0] regaddr; 45 reg [16-1:0] reg_addr_tmp; 46 reg [8-1:0] wr_data_tmp; 47 wire [9-1:0] idaddr_nc; 48 reg [8-1:0] id_addr_tmp; 49 reg rd_oper,rd_flag; 50 wire [9-1:0] wdata_nc; 51 wire [8-1:0] id_rwCtrl; 52 53 54 assign rdy = state_c == IDLE && !wr_en && !rd_en; 55 56 always @(posedge clk or negedge rst_n) begin 57 if (rst_n==0) begin 58 div_cnt 362 226:op_reg_data= {RW_CTRL, 24'h380bd0}; // DVPVO (720)-> 363 227:op_reg_data= {RW_CTRL, 24'h380c07}; // HTS 364 228:op_reg_data= {RW_CTRL, 24'h380d64}; // HTS 365 229:op_reg_data= {RW_CTRL, 24'h380e02}; // VTS 366 230:op_reg_data= {RW_CTRL, 24'h380fe4}; // VTS 367 231:op_reg_data= {RW_CTRL, 24'h381304}; // timing V offset 368 232:op_reg_data= {RW_CTRL, 24'h361800}; 369 233:op_reg_data= {RW_CTRL, 24'h361229}; 370 234:op_reg_data= {RW_CTRL, 24'h370952}; 371 235:op_reg_data= {RW_CTRL, 24'h370c03}; 372 236:op_reg_data= {RW_CTRL, 24'h3a0202}; // 60Hz max exposure 373 237:op_reg_data= {RW_CTRL, 24'h3a03e0}; // 60Hz max exposure 374 238:op_reg_data= {RW_CTRL, 24'h3a0800}; // B50 step 375 239:op_reg_data= {RW_CTRL, 24'h3a096f}; // B50 step 376 240:op_reg_data= {RW_CTRL, 24'h3a0a00}; // B60 step 377 241:op_reg_data= {RW_CTRL, 24'h3a0b5c}; // B60 step 378 242:op_reg_data= {RW_CTRL, 24'h3a0e06}; // 50Hz max band 379 243:op_reg_data= {RW_CTRL, 24'h3a0d08}; // 60Hz max band 380 244:op_reg_data= {RW_CTRL, 24'h3a1402}; // 50Hz max exposure 381 245:op_reg_data= {RW_CTRL, 24'h3a15e0}; // 50Hz max exposure 382 246:op_reg_data= {RW_CTRL, 24'h400402}; // BLC line number 383 247:op_reg_data= {RW_CTRL, 24'h30021c}; // reset JFIFO, SFIFO, JPG 384 248:op_reg_data= {RW_CTRL, 24'h3006c3}; // disable clock of JPEG2x, JPEG 385 249:op_reg_data= {RW_CTRL, 24'h471303}; // JPEG mode 3 386 250:op_reg_data= {RW_CTRL, 24'h440704}; // Quantization sacle 387 251:op_reg_data= {RW_CTRL, 24'h460b37}; 388 252:op_reg_data= {RW_CTRL, 24'h460c20}; 389 253:op_reg_data= {RW_CTRL, 24'h483716}; // MIPI global timing 390 254:op_reg_data= {RW_CTRL, 24'h382404}; // PCLK manual divider 391 255:op_reg_data= {RW_CTRL, 24'h5001a3}; // SDE on, CMX on, AWB on, scale on 392 256:op_reg_data= {RW_CTRL, 24'h350300}; // AEC/AGC on 393 257:op_reg_data= {RW_CTRL, 24'h301602}; //Strobe output enable 394 258:op_reg_data= {RW_CTRL, 24'h3b070a}; //FREX strobe mode1 395 //strobe flash and frame exposure 396 259:op_reg_data={RW_CTRL, 24'h3b0083}; //STROBE CTRL: strobe request ON, Strobe mode: LED3 397 260:op_reg_data={RW_CTRL, 24'h3b0000}; //STROBE CTRL: strobe request OFF 398 399 default:op_reg_data={RW_CTRL, 24'h000000}; 400 endcase 401 end 402 403 404 endmodule reg_config上电时序模块: 1 `timescale 1ns / 1ps 2 3 4 module setup( 5 input clk,//50MHZ 6 input rst_n, 7 output reg init_en, 8 9 output reg ov_pwdn1, 10 output reg ov_rst_n1, 11 output reg ov_pwdn2, 12 output reg ov_rst_n2 13 ); 14 15 parameter MS_CYC = 50_000; 16 17 reg [16-1:0] ms_cnt; 18 wire add_ms_cnt; 19 wire end_ms_cnt; 20 reg [ (5-1):0] wait_cnt ; 21 wire add_wait_cnt ; 22 wire end_wait_cnt ; 23 reg [5-1:0] N; 24 reg [ (2-1):0] phase_cnt ; 25 wire add_phase_cnt ; 26 wire end_phase_cnt ; 27 reg setup_done; 28 29 30 //ms计数 31 always @(posedge clk or negedge rst_n)begin 32 if(!rst_n)begin 33 ms_cnt |
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