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// this modules configures the codec via I2Ccontroller (instantiated in this module)
// it sets up the codec registers. table of settings read by FSM in at the end of file.

module I2C_AV_Config (	//	Host Side
						iCLK,
						iRST_N,
						//	I2C Side
						I2C_SCLK,
						I2C_SDAT	);
//	Host Side
input		iCLK;
input		iRST_N;
//	I2C Side
output		I2C_SCLK;
inout		I2C_SDAT;
//	Internal Registers/Wires
reg	[15:0]	mI2C_CLK_DIV;
reg	[23:0]	mI2C_DATA;
reg			mI2C_CTRL_CLK;
reg			mI2C_GO;
wire		mI2C_END;
wire		mI2C_ACK;
reg	[15:0]	LUT_DATA;
reg	[3:0]	LUT_INDEX;
reg	[1:0]	mSetup_ST;

//	Clock Setting
parameter	CLK_Freq	=	50000000;	//	50	MHz
parameter	I2C_Freq	=	20000;		//	20	KHz
//	LUT Data Number
parameter	LUT_SIZE	=	11;
//	Audio Data Index
parameter	Dummy_DATA	=	0;
parameter	SET_LIN_L	=	1;
parameter	SET_LIN_R	=	2;
parameter	SET_HEAD_L	=	3;
parameter	SET_HEAD_R	=	4;
parameter	A_PATH_CTRL	=	5;
parameter	D_PATH_CTRL	=	6;
parameter	POWER_ON	=	7;
parameter	SET_FORMAT	=	8;
parameter	SAMPLE_CTRL	=	9;
parameter	SET_ACTIVE	=	10;

/////////////////////	I2C Control Clock	////////////////////////
always@(posedge iCLK or negedge iRST_N)
begin
	if(!iRST_N)
	begin
		mI2C_CTRL_CLK	<=	0;
		mI2C_CLK_DIV	<=	0;
	end
	else
	begin
		if( mI2C_CLK_DIV	< (CLK_Freq/I2C_Freq) )
		mI2C_CLK_DIV	<=	mI2C_CLK_DIV+16'd1;
		else
		begin
			mI2C_CLK_DIV	<=	0;
			mI2C_CTRL_CLK	<=	~mI2C_CTRL_CLK;
		end
	end
end
////////////////////////////////////////////////////////////////////
I2C_Controller 	u0	(	.CLOCK(mI2C_CTRL_CLK),		//	Controller Work Clock
						.I2C_SCLK(I2C_SCLK),		//	I2C CLOCK
 	 	 	 	 	 	.I2C_SDAT(I2C_SDAT),		//	I2C DATA
						.I2C_DATA(mI2C_DATA),		//	DATA:[SLAVE_ADDR,SUB_ADDR,DATA]
						.GO(mI2C_GO),      			//	GO transfor
						.END(mI2C_END),				//	END transfor 
						.ACK(mI2C_ACK),				//	ACK
						.RESET(iRST_N)	);
////////////////////////////////////////////////////////////////////
//////////////////////	Config Control	////////////////////////////
always@(posedge mI2C_CTRL_CLK or negedge iRST_N)
begin
	if(!iRST_N)
	begin
		LUT_INDEX	<=	0;
		mSetup_ST	<=	0;
		mI2C_GO		<=	0;
	end
	else
	begin
		if(LUT_INDEX<LUT_SIZE)
		begin
			case(mSetup_ST)
			0:	begin
					mI2C_DATA	<=	{8'h34,LUT_DATA};
					mI2C_GO		<=	1;
					mSetup_ST	<=	1;
				end
			1:	begin
					if(mI2C_END)
					begin
						if(!mI2C_ACK)
						mSetup_ST	<=	2;
						else
						mSetup_ST	<=	0;							
						mI2C_GO		<=	0;
					end
				end
			2:	begin
					LUT_INDEX	<=	LUT_INDEX+4'd1;
					mSetup_ST	<=	0;
				end
			endcase
		end
	end
end
////////////////////////////////////////////////////////////////////
/////////////////////	Config Data LUT	  //////////////////////////	
always
begin
	case(LUT_INDEX)
	//	Audio Config Data
	Dummy_DATA	:	LUT_DATA	<=	16'h0000;
	SET_LIN_L	:	LUT_DATA	<=	16'h001A;
	SET_LIN_R	:	LUT_DATA	<=	16'h021A;
	SET_HEAD_L	:	LUT_DATA	<=	16'h046B;	// volume sx (bit 6:0)
	SET_HEAD_R	:	LUT_DATA	<=	16'h066B;	// volume dx (bit 6:0)
	A_PATH_CTRL	:	LUT_DATA	<=	16'h08F8;
	D_PATH_CTRL	:	LUT_DATA	<=	16'h0A06;
	POWER_ON		:	LUT_DATA	<=	16'h0C00;
	SET_FORMAT	:	LUT_DATA	<=	16'h0E01;
	SAMPLE_CTRL	:	LUT_DATA	<=	16'h101A;	// normal, 18Mhz, 32k
	SET_ACTIVE	:	LUT_DATA	<=	16'h1201;
	default		:	LUT_DATA	<=	16'h0000;
	endcase
end
////////////////////////////////////////////////////////////////////
endmodule
