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Merge branch 'bugfix/touch_pad_read_takes_too_much_time' into 'master'
authorIvan Grokhotkov <ivan@espressif.com>
Tue, 21 Mar 2017 06:46:30 +0000 (14:46 +0800)
committerIvan Grokhotkov <ivan@espressif.com>
Tue, 21 Mar 2017 06:46:30 +0000 (14:46 +0800)
modify touch pad read function

The touch pad read function taks too much time within spin lock waiting for the "done bit". (about 7.6ms as we tested)
So we try to use a mutex on the touch read function and any other functions might change the "done bit".

See merge request !543


Trivial merge
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