wire I2C_SDAT=SDO?1'bz:0 ;
reg ACK1,ACK2,ACK3;
wire ACK=ACK1 | ACK2 |ACK3;
//--I2C COUNTER
always @(negedge RESET or posedge CLOCK ) begin
if (!RESET) SD_COUNTER=6'b111111;
else begin
if (GO==0)
SD_COUNTER=0;
else
if (SD_COUNTER < 6'b111111) SD_COUNTER=SD_COUNTER+1;
end
end
//----
always @(negedge RESET or posedge CLOCK ) begin
if (!RESET) begin SCLK=1;SDO=1; ACK1=0;ACK2=0;ACK3=0; END=1; end
else
case (SD_COUNTER)
6'd0 : begin ACK1=0 ;ACK2=0 ;ACK3=0 ; END=0; SDO=1; SCLK=1;end
//start
6'd1 : begin SD=I2C_DATA;SDO=0;end
6'd2 : SCLK=0;
//SLAVE ADDR
6'd3 : SDO=SD[23];
6'd4 : SDO=SD[22];
6'd5 : SDO=SD[21];
6'd6 : SDO=SD[20];
6'd7 : SDO=SD[19];
6'd8 : SDO=SD[18];
6'd9 : SDO=SD[17];
6'd10 : SDO=SD[16];
6'd11 : SDO=1'b1;//ACK
//SUB ADDR
6'd12 : begin SDO=SD[15]; ACK1=I2C_SDAT; end
6'd13 : SDO=SD[14];
6'd14 : SDO=SD[13];
6'd15 : SDO=SD[12];
6'd16 : SDO=SD[11];
6'd17 : SDO=SD[10];
6'd18 : SDO=SD[9];