ychi
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Re: Aria 10 LCD I2C address
Hi, So we are going off of this sending sequence: start -> address -> r/w -> ack -> display on -> ack -> clear screen -> ack -> cursor home -> ack -> H -> ack -> and so on...-> ack -> stop but our lcd is still not responding. It seems like it's communicating to the address but nothing is displayed. here is the code: module HelloWorld ( input wire clk, // Controller clock input wire rstn, // Controller active low reset inout wire sda_pin_io, // I2C SDA Pin output scl_pin_o // I2C SCL Pin ); reg [7:0] address_n_data_i; // address to write into wire [7:0] rd_data_o; //wont need if uncommented above wire [2:0] req_status_o; //wont need if uncommented above wire io_sda_w; assign sda_pin_io = io_sda_w; reg [15:0] count; wire command_i; reg strb_i; reg rst_ni; reg [7:0] words [0:52]; initial begin words[0] = 8'hFE; // words[1] = 8'h41; // display on, needs 100uS words[2] = 8'hFE; // words[3] = 8'h51; // clear screen, needs 1.5ms words[4] = 8'hFE; words[5] = 8'h46; // set cursor to home, needs 1.5ms words[6] = 8'h48; // H takes 3ms words[7] = 8'h65; // e words[8] = 8'h6c; // l words[9] = 8'h6c; // l words[10] = 8'h6f; // o words[11] = 8'h20; // space words[12] = 8'h57; // W words[13] = 8'h6f; // o words[14] = 8'h72; // r words[15] = 8'h6c; // l words[16] = 8'h64; // d words[17] = 8'h21; // ! words[18] = 8'h20; // space end i2c_master lcd( .address_n_data_i(address_n_data_i), // Address and Data .command_i(command_i), // Command indicate read/write) .strb_i(strb_i), // Qualifier which will Latch inputs .clk_i(clk), // Controller clock .rst_ni(rst_ni), // Controller active low reset .sda_pin_io(io_sda_w), // I2C SDA Pin* .scl_pin_o(scl_pin_o), // I2C SCL Pin .rd_data_o(rd_data_o), // Output data on reads .req_status_o(req_status_o) ); parameter [17:0] max_count = 177; //15+(18*9) always @(negedge clk) begin if(rstn ==0) begin count <= 0; rst_ni <= 0; end else begin count <= (count == max_count)? max_count : count +1; rst_ni <= 1; end end assign command_i = 0; always@(*) begin if (count == 0 || count == max_count) strb_i = 0; if (count == 4) begin address_n_data_i = 8'h28; strb_i = 1; end if (count > 14 && (count%9 == 6)) //case(count%9) address_n_data_i = words[(count/9) -1];//8'b1011_1000; // function set //endcase end endmodule Could you point out what we are doing wrong? I've also attached the i2c_master.v we are using along with the top.v and the clk_divder.v... wave forms onTB seem okay, but nothing is displayed when .sof is run on the aria x board Thanks, Yong
