Ned Konz / Mbed 2 deprecated Multi_WS2811_test

Test program for my Multi_WS2811 library that started out as a fork of heroic/WS2811. My library uses hardware DMA on the FRDM-KL25Z to drive up to 16 strings of WS2811 or WS2812 LEDs in parallel.

Dependencies:   Multi_WS2811 mbed MMA8451Q

Fork of WS2811 by Heroic Robotics

NOTE: I have accidentally pushed changes for another fork of this program that I used in the recent Georgetown Carnival Power Tool Races. When I get some time, I will restore the test program to its original glory.

You can see my power tool racer (Nevermore's Revenge) here

/media/uploads/bikeNomad/img_0482.jpg

This tests my FRDM-KL25Z multi-string WS2811/WS2812 library. It uses the accelerometer to change the rainbow phase on two strings of LEDs as well as the touch sense to change brightness.

A video of this program in operation is here.

Here is the library that I developed to run the LEDs:

Import libraryMulti_WS2811

Library allowing up to 16 strings of 60 WS2811 or WS2812 LEDs to be driven from a single FRDM-KL25Z board. Uses hardware DMA to do a full 800 KHz rate without much CPU burden.

Last commit 13 Jun 2015 by Ned Konz

Diff: WS2811.cpp

Revision:
13:1f65330abe92
Parent:
12:7ebd51549c04
Child:
14:c97261a9a282
--- a/WS2811.cpp	Thu Apr 11 22:16:07 2013 +0000
+++ b/WS2811.cpp	Tue Jul 23 22:32:14 2013 +0000
@@ -27,6 +27,14 @@
     printf("ws2811:  1000 iters took %d usec.\n", i);
     bogocal = (1000 / (onewire_speed_multiplier * i * 4.2)); // iterations per bitcell (417 nsec)
     printf("ws2811:  calibrating to %d bogojiffies.\n", bogocal);
+    
+    data_mask = dat.get_mask();
+    clock_mask = clk.get_mask();
+    data_set = dat.get_set();
+    data_clr = dat.get_clr();
+    clock_set = clk.get_set();
+    clock_clr = clk.get_clr();
+    
 }
 
 /*
@@ -34,7 +42,7 @@
  */
  
 void WS2811::write(uint8_t byte) {
-    __disable_irq();
+    
     for (int i=0; i<8; i++) {
         if (byte & 0x80)
             writebit(1);
@@ -42,26 +50,26 @@
             writebit(0);
         byte <<= 1;
     }
-    __enable_irq();
 }
 
 inline void WS2811::celldelay(void) {
-    for (int i = 0; i<bogocal; i++)
+    for (volatile int i = 0; i<bogocal; i++)
         /* do nothing */ ;
 }
 
-void WS2811::writebit(bool bit) {
+inline void WS2811::writebit(bool bit) {
     // first cell is always 1
-    dat = 1;
+    (*data_set) = data_mask;
     celldelay();
     if (bit) {
+        (*clock_set) = data_mask; // dummy, we don't care but must take constant time
         celldelay();
     } else {
-        dat=0;
+        (*data_clr) = data_mask;
         celldelay();
     }
     // last cell is always 0
-    dat=0;
+    (*data_clr) = data_mask;
     celldelay();
 }
 
@@ -82,10 +90,11 @@
     uint16_t i, nl3 = numLEDs * 3; // 3 bytes per LED
     while (guardtime.read_us() < 50)
         /* spin */;
+    __disable_irq();
     for (i=0; i<nl3; i++ ) {
         write(pixels[i]);
     }
-
+    __enable_irq();
     guardtime.reset();
 }