David Grayson / Mbed 2 deprecated LedStripGradient

This is an example program for the PololuLedStrip library. It generates a simple moving gradient pattern.

Dependencies:   PololuLedStrip mbed LedStripGradient

Dependents:   LedStripGradient led_phare_crf

For more information, see the PololuLedStrip library.

Files at this revision

API Documentation at this revision

Revision 6:59f1db26a9ff, committed 2013-02-26

Comitter:
DavidEGrayson
Date:
Tue Feb 26 02:50:13 2013 +0000
Parent:
5:8b685ba2f16b
Child:
7:242f14ed9055
Commit message:
making 24 pulses with assembly

Changed in this revision

led_strip.s Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/led_strip.s	Tue Feb 26 02:25:19 2013 +0000
+++ b/led_strip.s	Tue Feb 26 02:50:13 2013 +0000
@@ -1,23 +1,213 @@
     AREA asm_func, CODE, READONLY
-    EXPORT led_strip_write_color
+    EXPORT led_strip_write_color   
 led_strip_write_color
-    push    {R9,R10}
-;    LDR     R9, =0x2009C020 ; 0x2009C020 = GPIO port 1 base address
-;    MOV.W   R10, #0x040000   ; 0x040000 = 1<<18 all "0"s with a "1" in bit 18
-;    CMP     R3, #0          ; value == 0 ?
-;    ITE EQ
-    STR   R3, [R1,#0]  ; set
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    NOP
-    STR   R3, [R2,#0]  ; clear
-    pop     {R9,R10}
-    BX      LR
+    push    {r12, r7}
+    
+    ldr r12, [r0]      ; Read the next color.
+    rbit r12, r12      ; Reverse the order of the bits.
+    rev r12, r12       ; Reverse the order of the bytes.
+    mov r7, #24        ; Initialize the loop counter register.
+    
+send_led_strip_bit
+    str r3, [r1]       ; Drive the line high.
+    rrxs r12, r12      ; Rotate right through carry.
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+        
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+        
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+        
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+        
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    it cc
+    strcc r3, [r2]       ; Drive the line low.
+
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+
+    it cs
+    strcs r3, [r2]       ; Drive the line low.
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    nop
+    nop
+    nop
+    nop
+    nop
+    
+    sub r7, r7, #1               ; Decrement the loop counter.
+    cbz r7, led_strip_asm_end    ; If we have sent 24 bits, go to the end.
+    b send_led_strip_bit         ; Otherwise, go back and send another bit.
+    
+led_strip_asm_end
+    pop {r12, r7}
+    bx lr
+    
     END
\ No newline at end of file

--- a/main.cpp	Tue Feb 26 02:25:19 2013 +0000
+++ b/main.cpp	Tue Feb 26 02:50:13 2013 +0000
@@ -110,11 +110,8 @@
     gpio_init(&gpio, p8, PIN_OUTPUT);
 
     while(1) {
-        myled2 = 1;
+        myled2 = !myled2.read();
         led_strip_write_color(colors, gpio.reg_set, gpio.reg_clr, gpio.mask);
         wait(0.2);
-        led_strip_write_color(colors, gpio.reg_set, gpio.reg_clr, gpio.mask);
-        myled2 = 0;
-        wait(1);
     }
 }