got encoder 4 working (in software)
diff --git a/bbb_cape/src/cape/hardware.notes b/bbb_cape/src/cape/hardware.notes
index 73593b6..54c8029 100644
--- a/bbb_cape/src/cape/hardware.notes
+++ b/bbb_cape/src/cape/hardware.notes
@@ -19,7 +19,7 @@
 PA13 SWDIO
 PA14 SWCLK
 PA15 (gets pulled up during reset (JTAG pin))
-PB0  TIM1.2
+PB0  TIM3.3
 PB1
 PB2  BOOT1 (tie to GND)
 PB3  TIM2.2