Changeset 3502


Ignore:
Timestamp:
Dec 28, 2012 9:14:36 AM (5 months ago)
Author:
quozl
Message:

OLPC XO-4 - fix support for non-touchscreen SKUs, compatible with touchscreen SKUs, treats TOUCH_HD# signal as active high, since the touchscreen controller is pulling the signal low in normal operation, momentarily enables a pull-down in conflict against the permanent pull-up, in order to sample the signal properly. Requires a BOM change. #12391

File:
1 edited

Legend:

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  • cpu/arm/olpc/nn-touchscreen.fth

    r3495 r3502  
    7171: hold-reset  ( -- )  touch-rst-gpio# gpio-clr  ; 
    7272: no-data?  ( -- no-data? )  touch-int-gpio# gpio-pin@  ; 
    73 : absent?  ( -- flag )  touch-hd-gpio# gpio-pin@  0=  ; 
     73: absent?  ( -- flag ) 
     74   touch-hd-gpio# af@  +pull-dn  touch-hd-gpio# af! 
     75   1 ms 
     76   touch-hd-gpio# gpio-pin@ 
     77   touch-hd-gpio# af@  0 +pull-dn invert and  touch-hd-gpio# af! 
     78; 
    7479 
    7580d# 250 constant /pbuf 
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