aboutsummaryrefslogtreecommitdiffstats
path: root/libraries/LiquidCrystal
diff options
context:
space:
mode:
authorMarti Bolivar <mbolivar@leaflabs.com>2011-02-25 13:17:59 -0500
committerMarti Bolivar <mbolivar@leaflabs.com>2011-02-25 13:17:59 -0500
commitb505ab981859761a9eae9e820c5a06e2210c5dfc (patch)
tree8f4aaac412a1bcfe3abb5551e532333a3a609685 /libraries/LiquidCrystal
parent262e01aa1f5944544df040105e764e62a7864883 (diff)
downloadlibrambutan-b505ab981859761a9eae9e820c5a06e2210c5dfc.tar.gz
librambutan-b505ab981859761a9eae9e820c5a06e2210c5dfc.zip
Shaving 32 microseconds off of LiquidCrystal::pulseEnable().
Diffstat (limited to 'libraries/LiquidCrystal')
-rw-r--r--libraries/LiquidCrystal/LiquidCrystal.cpp14
1 files changed, 7 insertions, 7 deletions
diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp
index 366ad6c..f05aed8 100644
--- a/libraries/LiquidCrystal/LiquidCrystal.cpp
+++ b/libraries/LiquidCrystal/LiquidCrystal.cpp
@@ -303,16 +303,16 @@ void LiquidCrystal::pulseEnable(void) {
digitalWrite(_enable_pin, LOW);
delayMicroseconds(1);
- // Enable pulse must be > 450 ns. Value chosen here is the max
- // of the following two reports:
- // http://forums.leaflabs.com/topic.php?id=640&page=2
+ // Enable pulse must be > 450 ns. Value chosen here according to
+ // the following threads:
+ // http://forums.leaflabs.com/topic.php?id=640
// http://forums.leaflabs.com/topic.php?id=512
- digitalWrite(_enable_pin, HIGH);
- delayMicroseconds(30);
+ togglePin(_enable_pin);
+ delayMicroseconds(1);
+ togglePin(_enable_pin);
// Commands needs > 37us to settle.
- digitalWrite(_enable_pin, LOW);
- delayMicroseconds(45);
+ delayMicroseconds(42);
}
void LiquidCrystal::write4bits(uint8 value) {