simulation: wip simulation loop

diff --git a/src/simulation.s b/src/simulation.s
index 3e5fb92e49bc482a8485dd180b366a0dac7c795d..3cc948721d50d35f850b345904cea561aedff571 100644 (file)
--- a/src/simulation.s
+++ b/src/simulation.s
@@ -6,4 +6,28 @@
   ; increments cell_idx every iteration
   ; resets cell_idx to 0 when end of cells is reached
 sim_update:
+  ld a, 0 ; max loop counter 
+
+  ; load back cell ptr from last iteration
+  ld a, [cell_ptr]
+  ld e, a
+  ld a, [cell_ptr+1]
+  ld d, a
+
+  ; TODO
+  ; for now we just iterate all 
+  ; cells in a single go
+  ; later we want a limit 
+  ld de, state_cells
+@loop:
+    
+    ; jp nz, @loop
+    
+
+  ; finally store cell ptr
+  ld e, a
+  ld [cell_ptr], a
+  ld d, a
+  ld [cell_ptr+1], a
+
   ret

diff --git a/src/wram.s b/src/wram.s
index 1742b51c9c295ad63e51531fd933bd3aa5964f7b..349ca5b4af6abccb6e4837901f1d068636b30ff6 100644 (file)
--- a/src/wram.s
+++ b/src/wram.s
@@ -59,7 +59,8 @@ r_population: .adv 2
 
   ; current cell index
   ; for cell update loop
-cell_idx: .adv 2
+  ; big endian
+cell_ptr: .adv 2
 
 state_cells: .adv c_size * MAP_SIZE
 state_cells_end: