Add discussion Stuff

1 files changed, 40 insertions, 0 deletions

diff --git a/Disc02.X/disc02asm.s b/Disc02.X/disc02asm.s
new file mode 100644
index 0000000..c718500
--- /dev/null
+++ b/Disc02.X/disc02asm.s
@@ -0,0 +1,40 @@
+        .equ __P24FJ64GA002,1        ;required "boiler-plate" (BP)
+        .include "p24Fxxxx.inc"      ;BP
+
+#include "xc.inc"                    ;BP
+	; DO NOT include config statements. We define them in the C file
+        ;the next two lines set up the actual chip for operation - required
+        ;config __CONFIG2, POSCMOD_NONE & I2C1SEL_PRI & IOL1WAY_OFF & OSCIOFNC_ON & FCKSM_CSECME & FNOSC_FRCPLL & SOSCSEL_LPSOSC & WUTSEL_FST & IESO_OFF
+        ;config __CONFIG1, FWDTEN_OFF & COE_OFF & BKBUG_OFF & GWRP_OFF & GCP_OFF & JTAGEN_OFF
+
+    .bss                        ;put the following labels in RAM
+_counter:  .space  2          ;declare a 16-bit variable
+; you SHOULD NOT define stack, becasue this file is compiled 
+; alongside a C file that contains main(). The C compiler
+; will create stack space for us.
+;stack:
+;    .space  32                  ;this will be our stack area, from var_16_bit to here
+    .text                       ;BP (put the following data in ROM(program memory))
+    .global _myAsmFunc
+    .global _myGlobalVar
+    .global _counter
+
+_myAsmFunc:
+    push    w0
+    
+    inc	    _myGlobalVar
+    inc	    _counter
+    
+    bra	    checkLoopEndCond
+loopBody:
+    btg    LATB, #2	    ; btg stands for bit-toggle.
+    nop
+    dec	    WREG0
+checkLoopEndCond: 
+    cp0	    w0
+    bra	    nz, loopBody
+
+    pop	    w0
+    return
+    .end
+