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Update README

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This commit is contained in:
Gregory Nutt 2015-12-02 15:54:20 -06:00
parent 4991f94792
commit 216f762e56
2 changed files with 13 additions and 5 deletions
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10
configs/same70-xplained/README.txt
View File

@ -898,6 +898,16 @@ Tickless OS
CONFIG_SAMV7_TICKLESS_FREERUN=1 : Selects TC0 channel 1 for the free-
: running timer
NOTE: In most cases, the slow clock will be used as the timer/counter
input. The SAME70-Xplained board has pads for a 32.768KHz crystal,
however, the boad ships with that position unpopulated. So, be default
this will probably end up using the slow RC oscillator which will give
you very bad timing.
If you add a crystal to your board, you can select to use it with the
definition BOARD_HAVE_SLOWXTAL in the configs/same70-xplained/board.h
file.
SAME70 Timer Usage
------------------
This current implementation uses two timers: A one-shot timer to

8
configs/samv71-xult/README.txt
View File

@ -1471,7 +1471,7 @@ Tickless OS
Configuration
-------------
The following configuration options will enable support for the Tickless
OS for the SAMV7 platforms using TC0 channels 0-3 (other timers or
OS for the SAMV7 platforms using TC0 channels 0-1 (other timers or
timer channels could be used making the obvious substitutions):
RTOS Features -> Clocks and Timers
@ -1490,10 +1490,8 @@ Tickless OS
: running timer
NOTE: In most cases, the slow clock will be used as the timer/counter
input. You should enable the 32.768KHz crystal for the slow clock by
calling sam_sckc_enable(). Otherwise, you will be doing all system
timing using the RC clock! UPDATE: This will now be selected by default
when you configure for TICKLESS support.
input. The 32.768KHz crystal is selected by the definition
BOARD_HAVE_SLOWXTAL in the configs/samv71-xult/board.h file.
SAMV7 Timer Usage
-----------------