Correct power-on delay #28
Open
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Increase power-on delay to that specified by the device datasheet Skip delay if device is already powered up Signed-off-by: Paul Brook <paul@nowt.org>
repeat83
pushed a commit
to repeat83/RF24
that referenced
this pull request
Feb 10, 2014
commit pull from here maniacbug#28
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The nRF24L01 datasheet documents the power-up startup time (from Power Down to Standby-I) as 1.5ms (1500us). However startWrite only waits 150ms. Increase this delay to the required value.
If the device is already powered up we can skip this delay entirely.
On some tests we get lucky - typically if we are switching from receive to transmit mode, so the oscillator is already warmed up.
However e.g. pingpair_pl the TX device is spends most of its time powered down. The cold-start time on my module means with the 150us delay transmission fails most (>95%) of the time.