Third lab day 14-02-2014

After 2 weeks of discussing and researching, each member has made some achievements. However, our supervisor raised some questions when we met him before starting the lab. The problem is that the overall structure is still not very clear to him. Therefore, we modified our structure and made it as a flowchart of the whole procedure.

Overall flowchart for vending machine

Here is the work that members have done on our second lab day.

Ye Zhu
I finished drawing the state diagram and block diagram of my part -- coin receiver. Then I started writing the VHDL code for coin receiver. After searching on the internet, I found some useful sources of vending machine. (Ref: J Zhang, The Design, Simulation, Verification and Implementation of Vending Machine
Based on FPGA)  I modified the code according to the source supplied.

Block diagram for coin_receiver

Junlin Guo
In the third week, I have finished the fundamental coding process for the change returner. However, we were told by the supervisor that we still need to work on the top level of design which involves making sequence diagram and overall block diagram. In my point of view, the supervisor wants us to carry out the design in a formal procedure, step by step. After this week's meeting, we need to adjusted our strategy as soon as possible. Hopefully, we can catch up the schedule in the next week.

Yuhao Gu
I finished the code for keypad, four bits cols input, four bits rows output, a valid to insure the key pressed is useful, a 4 bits output that connect to the control. This is the block digram.

Block diagram for keypad