[PmodENC Example code repetition]

Thanks @artvvb

Another aspect that I've noticed about the example code, it assumes that the decoder will always land at a detent position where A=1 and B=1 ("idle" state).

If you have an encoder which doesn't have detents or the encoder has, say, 30 detents and 15 positions, the logic may not function properly. In either case, it's unlikely (50% at best) that the encoder will rest in the "idle" state.

I appreciate that the code was written specifically for the Pmod part, but maybe it could have been more universal to use the circular logic (below) as opposed to the L-R strategy in the example?

Just a thought!

 

[PmodENC Example code repetition]

I'm adapting the Pmod encoder example to use with one of my projects. In the example source code, Encoder.v, there is a state repetition during the FSM - state "R3" occurs twice.

I just want to confirm that this is a mistake - or maybe it's repeated for some reason I have yet to consider?

 

					  // R2
					  "R2" : begin
							 LED <= 2'b01;

							 if (A == 1'b1) begin
								 nextState <= "R1";
							 end
							 else if (B == 1'b1) begin
								 nextState <= "R3";
							 end
							 else begin
								 nextState <= "R2";
							 end
					  end
					  // R3
					  "R3" : begin
							 LED <= 2'b01;

							 if (B == 1'b0) begin
								 nextState <= "R2";
							 end
							 else if (A == 1'b1) begin
								 nextState <= "add";
							 end
							 else begin
								 nextState <= "R3";
							 end
					  end
					  // R3
					  "R3" : begin
							 LED <= 2'b01;

							 if (B == 1'b0) begin
								 nextState <= "R2";
							 end
							 else if (A == 1'b1) begin
								 nextState <= "add";
							 end
							 else begin
								 nextState <= "R3";
							 end
					  end
					  // Add
					  "add" : begin
							 LED <= 2'b01;
							 nextState <= "idle";
					  end

 

[ZYBO-Z720 Audio CODEC I2C pins]

I'm testing an audio project and I'm trying to connect the PS I2C to the audio CODEC via the MIO interface.

The reference manual says that the CODEC SCL and SDA are connected to N17 & N18 pins on the FPGA but it doesn't say which MIO ports are used.

So...

1. How would I normally find this information within Vivado (or elsewhere)?

2. How do I map the I2C MIO ports to the physical pins, N17 & N18?