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--- notes:comporg:spring2025:projects:dapx [2025/03/07 19:55] – Fixed ASCII code for '[' tkastne1
+++ notes:comporg:spring2025:projects:dapx [2025/03/20 03:15] (current) – [Debug Registers] tkastne1
@@ Line 135: / Line 135: @@
 <code>
-   mov   R1,   0xF0000000  ; Creating the mask
+mov   R1,   0xF0000000  ; Creating the mask
-   and   R1,   R0          ; R0 is the original value
+and   R1,   R0          ; R0 is the original value
 </code>
@@ Line 144: / Line 144: @@
 <code>
-   mov   R2,   R3          ; R3 is the loop count
+mov   R2,   R3          ; R3 is the loop count
-   imul  R2,   -4          ; Left shift bits per nibble
+imul  R2,   -4          ; Left shift bits per nibble
-   mov   R1,   0xF0000000  ; Creating the mask
+mov   R1,   0xF0000000  ; Creating the mask
-   shl   R1,   R2
+shl   R1,   R2
-   and   R1,   R0          ; R0 is the original value
+and   R1,   R0          ; R0 is the original value
 </code>
 ====Shifting====
@@ Line 159: / Line 159: @@
 ===Displaying===
+Because we already have the debug function, we can use that to display all of the hex values needed
+The format is identical for every address, and goes as the following: [address]:value
+We can print the brackets and colon manually and leave the address and values to the debug function
+<code>
+mov   R3,         91          ;ASCII code for '['
+out   GPUREGION,  R3
+mov   R3,         0           ;Xpos
+out   XDRAWINGP,  R5
+out   GPUCOMMAND, DRAWREGION  ;Draw
+</code>
+Repeat this for ']' and ':' changing the Xpos and accounting for the address width
+Utilize the debug function to print the address and value as shown in the following
+<code>
+push  R2                      ;R2 is the current address
+mov   R3,         10          ;Xpos
+push  R3
+push  R4                      ;Ypos
+call  _debug
+mov   R3,         [R2]        ;Get the value
+push  R3
+mov   R3,         130         ;Xpos
+push  R3
+push  R4                      ;Ypos
+call  _debug
+</code>
+All of this code should be run for every address, stepping from the start value to the end value
+We will need to setup a loop with an exit condition
+===pseudocode===
+<code>
+MOVE THE STARTING ADDRESS INTO A DEDICATED REGISTER (current address)
+UNTIL WE HAVE PASSED THE FINAL ADDRESS:
+   TEST IF THE CURRENT ADDRESS IS GREATER THAN THE FINAL ADDRESS
+      SHOULD IT BE GREATER SKIP TO AFTER THIS LOOP
+   DISPLAY THE ADDRESS AND VALUE
+   INCREMENT THE YPOS
+   INCREMENT THE ADDRESS
+REPEAT
+</code>
 ======debugregister function======
 =====dapX imagery=====
@@ Line 180: / Line 228: @@
 ======Debug Registers======
-===Printing out R:===
+===Printing out R#:===
+The simplest way to print out the register label would be to separate the singe and double digit registers into to groups
+For registers 0-9 we print 'R' then the register number then ':'
+For registers 10-13 we print 'R' & '1' then the register number minus 10 then ':'
 ===Printing registers===
+Since we want to preserve all of the register values, we push them onto the stack at the start
+Using this we can get the value for each register to print out
+Assuming we push the register 0-13 directly after saving the base pointer we can do the following to get R0:
+<code>
+mov   R0,   [BP - 1] ; Get the value of R0
+push  R0
+mov   R0,  Xpos
+push  R0
+mov   R0,  Ypos
+push  R0
+call  _debug         ; Print out the value of R0 wherever we want
+</code>
+This process can be repeated for all registers
 ===Debugging our debugregs Subroutine===

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