Name: Ian Van Horn Email: imvanhorn1@gmail.com
HW 8 This homework fabricates a microcontroller on the BAYSYS 3. The embedded soft core is PicoBlaze
** Only original assembly code is shown, all code regarding picoblaze,
and all code given for tasks is copied directly from the tutorial. Port
declarations are needed so these are shown.
Task 1: Turn on and off LEDs
corrosponding to switches.(10 points).
Figure 1-1: Port declarations
The brunt work of creating picoblase was copied form the website. All
that is needed to add are port declarations for the i/o tools being
used.
For the assembly code, inputs are grabbed from the switches and written
to s0 then s0 is defined as te output. Then the program jumps and does
it again.
Video 1-1: Demonstration of implimentation of Pico Blaze to turn
onn and off lights
Task 2: The square problem(10 points).
Downloaded assambly code was used for this task
Video 2-1: Square problem demonstration
Task 3: Add 0x13(10 points).
The value from the switches is interprited as binary. 13 is hex is added then the result is displayed
Video 3-1: Demonstration of addind 0x13 to the value on the switches
Task 4: Using a mask(10 points).
Video 4-1: Using a mask to always set lowest 2 bits
Task 5: Right Shift one Bit(10 points).
The input is ored with a mask with 11 in the two LSBs. This means these 2 bits will always be high
Vidoe 5-1: Shift right one bit demonstration
Task 6: Using Jump, return and
load(10 points).
First, the jump to TESTING was replaced with a call
Video 6-1: Using a call instead of a return
This works as expected, any time testing is called it returns to the
call line after the subroutiene is finished. Immdietly after the call
line the output is set to s2 which is 5. For this reason 5 is always
displayed.
Video 6-2: Demo with code form tutorial
Now the program never returnes if TESTING is called so the program
either displays 5 or 6
Task 7: Multipule subroutines(10 points).
Figure 7-1: Results form website code
Conditional jumps are used. The input number is tested in all bits. If
is is non zero count is incrimented and the number is
deincrimented. If it is zero than the output is set to the count.
Task 8: Substitute for compare (10 points).
Figure 8-1: Compare substitution
Test checks certian bits of a register for 0's. Compare directly sees
if the register is equal to another number.
Figure 8-2: Same result as 7-1 but with compare
Task 9: display number fo
flipped switches in binary (20 points).
Figure 9-1: Code
The LSB is checked. If it is a 1 add 1 to the counter. If is is 0 do
nothing. Then shift right. Repeat 8 times then display count
Video 9-1: Demonstration
Conclusion: The softcore implimentation was very interisting. For the
most part the code was given and the tutorial was straight forward. But
the code for making picoblaze is so much more advanced than other
projects even somthing as simple as port declarations was confusing.
