Turn off on-module LED betwen frames

This isn't great, since the light blinks once per frame, but it's better
than nothing.  When the display is static (including off), the LED stays
off, at least.

diff --git a/init-early.lua b/init-early.lua
index 56b8ebda7f1644a601eb132d75ad0e61e306c417..ccac86f0ed22f901ddc7e6cee0cb994168b466c5 100644 (file)
--- a/init-early.lua
+++ b/init-early.lua
@@ -9,6 +9,8 @@ ws2812.write(fb)
 tmr.delay(350)
 gpio.write(3,gpio.LOW)
 
+gpio.mode(4, gpio.INPUT) -- de-initialize ws2812 to turn off on-module blue LED
+
 -- Do we have a new LFS blob?  If so, install it.
 file.remove("luac.out.stage")
 if file.exists("luac.out") then

diff --git a/init2.lua b/init2.lua
index 0dc4a44d6bb88db5f82ba0b3c3bdedf2117d5dfb..edb0010dabe19d2dcc72443536a2c87b0a6ccfc0 100644 (file)
--- a/init2.lua
+++ b/init2.lua
@@ -46,6 +46,7 @@ baselinefb:fill(1,1,1)
 local doublefb = ws2812.newBuffer(32,3)
 function dodraw()
   if not isblackout then
+    local b = ledfb
     if dimfactor > 0 then
       -- dimming, so mix the baseline "all channels on minimum" as 127/256ths
       -- to control rounding (see below).  The image in "ledfb" will be mixed
@@ -56,26 +57,28 @@ function dodraw()
       -- bits after summation, so adding 127 more means that we now round up
       -- (i.e., by ceil), so an active channel will remain active.
       doublefb:mix(127,baselinefb,256/(dimfactor+1),ledfb)
-      gpio.write(3,gpio.HIGH)
-      ws2812.write(doublefb)
-    else
-      gpio.write(3,gpio.HIGH)
-      ws2812.write(ledfb)
+      b = doublefb
     end
+    gpio.write(3,gpio.HIGH)
+    ws2812.init(ws2812.MODE_SINGLE)
+    ws2812.write(b)
     -- Wait for the UART to drain and for the LED strip to latch (nominally
     -- 350 usec).  This isn't really OK, but we're probably not pushing the
     -- 15 mSec or so that the SDK says we have?
     tmr.delay(350)
     gpio.write(3,gpio.LOW)
+    gpio.mode(4,gpio.INPUT) -- LED off
   end
 end
 -- Not ideal, but at least this keeps all the gpio wibbling to this one file
 function doblackout()
   isblackout = true
   gpio.write(3,gpio.HIGH)
+  ws2812.init(ws2812.MODE_SINGLE)
     ws2812.write(string.char(0):rep(32*3))
     tmr.delay(350)
   gpio.write(3,gpio.LOW)
+  gpio.mode(4,gpio.INPUT) -- LED off
 end
 
 function removeremote()