+ reg [30:0] waste_counter = 0;
+ reg [7:0] saved_news [3:0];
+ reg [7:0] sent_byte [3:0];
+
+ reg [7:0] bytes_sent = 0;
+
+ // i2c
+ reg [15:0] leds [3:0];
+
+ initial begin
+ leds[0] <= 16'hF00F;
+ leds[1] <= 16'h0000;
+ leds[2] <= 16'h0000;
+ leds[3] <= 16'hFFFF;
+ end
+
+ /* even rows are green, odd rows are red:
+ * mb_leds[2 * k] is the kth row of green leds
+ * mb_leds[2 * k + 1] is the kth row of red leds
+ */
+ wire [7:0] mb_leds [15:0];
+
+ // all red leds are off
+ assign mb_leds[1] = program_counter;
+ assign mb_leds[3] = 0;
+ assign mb_leds[5] = state;
+ assign mb_leds[7] = uart_ptr;
+ assign mb_leds[9] = 0;
+ assign mb_leds[11] = 0;
+ assign mb_leds[13] = 0;
+ assign mb_leds[15] = 0;
+
+ // green leds, first half
+ assign mb_leds[0] = {leds[1][3:0], leds[0][3:0]};
+ assign mb_leds[2] = {leds[1][7:4], leds[0][7:4]};
+ assign mb_leds[4] = {leds[1][11:8], leds[0][11:8]};
+ assign mb_leds[6] = {leds[1][15:12], leds[0][15:12]};
+
+ // green leds, second half
+ assign mb_leds[8] = {leds[3][3:0], leds[2][3:0]};
+ assign mb_leds[10] = {leds[3][7:4], leds[2][7:4]};
+ assign mb_leds[12] = {leds[3][11:8], leds[2][11:8]};
+ assign mb_leds[14] = {leds[3][15:12], leds[2][15:12]};
+
+ wire [7:0] mb_in;
+ wire [5:0] mb_addr;
+ assign mb_in = mb_leds[mb_addr];
+
+ reg [7:0] i2c_tx_byte;
+ reg [5:0] more_bytes = 0;
+ reg i2c_transmit = 0;
+ wire i2c_is_transmitting;
+
+ i2c_write #(.CLOCK_DIVIDE(`I2C_DIVIDE)) i2c (.clk(clk), .scl(scl), .sda(sda), .tx_byte(i2c_tx_byte), .transmit(i2c_transmit), .is_transmitting(i2c_is_transmitting), .more_bytes(more_bytes), .mb_in(mb_in), .mb_addr(mb_addr));
+
+ reg [3:0] i2c_init_step = 0;
+
+ always @ (posedge clk) begin
+ if(i2c_is_transmitting || i2c_transmit)
+ i2c_transmit <= 0;
+ else begin
+ if(i2c_init_step == 0) begin
+ i2c_tx_byte <= 8'h21; // turn on oscillator
+ i2c_transmit <= 1;
+ i2c_init_step <= 1;
+ end else if(i2c_init_step == 1) begin
+ i2c_tx_byte <= 8'h81; // display on, blink off
+ i2c_transmit <= 1;
+ i2c_init_step <= 2;
+ end else if(i2c_init_step == 2) begin
+ i2c_tx_byte <= 8'hEF; // max brightness
+ i2c_transmit <= 1;
+ i2c_init_step <= 3;
+ end else if(i2c_init_step == 3) begin
+ i2c_tx_byte <= 0;
+ more_bytes <= 16;
+ i2c_transmit <= 1;
+ i2c_init_step <= 4;
+ end else begin
+ i2c_transmit <= 1;
+ end
+ end
+ end
+
+