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module cmos_top(
osc_24MHZ,
iRST,
//ov7660
ov7660_reset,
ov7660_xclk,
ov7660_pclk,
ov7660_data_8bit,
iVSYNC,
iLVAL,
lcd2_cs,
lcd2_wr,
lcd2_rs,
lcd2_reset,
lcd2_rd,
lcd2_data16,
oDVAL
);
input osc_24MHZ;
input iRST;
//ov7660
output ov7660_reset;
output ov7660_xclk;
input ov7660_pclk;
input [7:0] ov7660_data_8bit;
input iVSYNC;
input iLVAL;
//tft
output lcd2_cs;
output lcd2_wr;
output lcd2_rs;
output lcd2_reset;
output lcd2_rd;
output [15:0] lcd2_data16;
///////////////////////////////////
output oDVAL;
assign iCLK = ov7660_pclk;
assign lcd2_wr = reg_lcd2_wr;
assign lcd2_rs = 1'b1;
assign lcd2_rd = 1'b1;
assign lcd2_cs = 1'b0;
assign lcd2_reset = 1'b1;
assign lcd2_data16[15:0] = ov7660_data_16bit[15:0];
reg Pre_FVAL;
reg mCCD_FVAL;
reg mCCD_LVAL;
reg [7:0] mCCD_DATA;
reg [10:0] X_Cont;
reg [10:0] Y_Cont;
assign oX_Cont = X_Cont;
assign oY_Cont = Y_Cont;
//assign i0v7660_data_8bit[7:0] = mCCD_DATA[7:0];
assign i0v7660_data_8bit[7:0] = ov7660_data_8bit[7:0];
//assign oDVAL = mCCD_FVAL&mCCD_LVAL;
assign oDVAL = mCCD_FVAL&iLVAL;
wire [7:0] i0v7660_data_8bit;
////////////////////////////////
//
assign iFVAL = iVSYNC;
reg [1:0] temp_count;
always@(posedge iCLK or negedge iRST)
begin
if(!iRST)
begin
Pre_FVAL <= 0;
mCCD_FVAL <= 0;
mCCD_LVAL <= 0;
mCCD_DATA[7:0] <= 8'h00;
X_Cont <= 0;
Y_Cont <= 0;
end
else
begin
Pre_FVAL <= iFVAL;
if( {Pre_FVAL,iFVAL}==2'b10)
mCCD_FVAL <= 1;
else if({Pre_FVAL,iFVAL}==4'b01)
mCCD_FVAL <= 0;
mCCD_LVAL <= iLVAL;
// mCCD_DATA[7:0] <= ov7660_data_8bit[7:0];
if(mCCD_FVAL)
begin
if(mCCD_LVAL)
begin
if(X_Cont<639)
X_Cont <= X_Cont+1;
else
begin
X_Cont <= 0;
Y_Cont <= Y_Cont+1;
end
end
end
else
begin
X_Cont <= 0;
if(temp_count == 3) //这里的temp_count是什么作用
begin
Y_Cont <= 0;
temp_count <= 2'b00;
end
else
temp_count <= temp_count + 1'b1;
end
end
end
///////////////////////////////////////////////////////
//ov7660 data 8 bit to 16 bit
//功 能：将输入的8位数据转换成16位，同时进行位转换。
//由OV7660 RGB565 的输出格式 RRRRRGGGGGGBBBBB 改为 BBBBBGGGGGGRRRRR 格式
//转换后的数据符合TFT 数据输入格式
reg state1;
reg [7:0] pre_i0v7660_data_8bit;
reg [15:0] ov7660_data_16bit;
always@(posedge iCLK or negedge iRST)
if(!iRST)
begin
state1 <= 1'b0;
end
else
begin
if(iLVAL)
case(state1)
1'b0 : begin
pre_i0v7660_data_8bit[7:0] <= i0v7660_data_8bit[7:0];
state1 <= 1'b1;
end
1'b1 : begin
ov7660_data_16bit[15:0] <= {pre_i0v7660_data_8bit[7:0],i0v7660_data_8bit[7:0]};
//{pre_i0v7660_data_8bit[7:0],i0v7660_data_8bit[7:0]};
//{i0v7660_data_8bit[4:0],pre_i0v7660_data_8bit[7:3],pre_i0v7660_data_8bit[2:0],i0v7660_data_8bit[7:5]};
//{i0v7660_data_8bit[4:0],pre_i0v7660_data_8bit[2:0],i0v7660_data_8bit[7:5],pre_i0v7660_data_8bit[7:3]};//{pre_i0v7660_data_8bit,i0v7660_data_8bit};
state1 <= 1'b0;
end
default : state1 <= 1'b0;
endcase
end
reg temp1;
reg temp2;
always@(posedge iCLK or negedge iRST)
if(!iRST)
begin
temp1 <= 1'b0;
temp2 <= 1'b0;
end
else
begin
temp1 <= iLVAL;
temp2 <= temp1;
end
reg reg_lcd2_wr;
reg write_state;
always@(negedge iCLK or negedge iRST)
if(!iRST)
begin
reg_lcd2_wr <= 1'b1;
write_state <= 1'b0;
end
else
case(write_state)
0 : if(temp2&(Y_Cont == 0)&tft_outenable)
begin
reg_lcd2_wr <= ~reg_lcd2_wr;
write_state <= 1'b1;
end
else
reg_lcd2_wr <= 1'b1;
1 : begin
if(temp2)
reg_lcd2_wr <= ~reg_lcd2_wr;
else
reg_lcd2_wr <= 1'b1;
if(Y_Cont < 240)
write_state <= 1'b1;
else
write_state <= 1'b0;
end
endcase
reg [2:0] Frame_Cont;
reg tft_outenable;
always@(posedge iCLK or negedge iRST)
begin
if(!iRST)
Frame_Cont <= 0;
else
begin
if({Pre_FVAL,iFVAL}==2'b10) //这里是当iVSYNC下降沿时让Frame_cont 加1吗，为什么要加到小于5呢？
if(Frame_Cont < 5)
begin
Frame_Cont <= Frame_Cont+1;
tft_outenable <= 1'b0;
end
else
tft_outenable <= 1'b1;
end
end
endmodule |
阿莫论坛20周年了！感谢大家的支持与爱护！！
曾经有一段真挚的爱情摆在我的面前，我没有珍惜，现在想起来，还好我没有珍惜……
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发表于 2011-12-12 10:54:23
楼主
