Author: wmb Date: Wed Nov 14 08:11:21 2012 New Revision: 3423 URL: http://tracker.coreboot.org/trac/openfirmware/changeset/3423
Log: OLPC ARM - accelerometer selftest a) reduced the min-y value to prevent test fallout b) Eliminated the not1g? test because it was failing sometimes. The selftest is now almost worthless because the vendor-recommended acceptance range encompasses pretty much the entire number range. I guess what is being tested is whether the value changes at all (in the right direction) when you invoke the built-in-test feature.
Modified: cpu/arm/olpc/accelerometer.fth
Modified: cpu/arm/olpc/accelerometer.fth ============================================================================== --- cpu/arm/olpc/accelerometer.fth Wed Nov 14 04:06:40 2012 (r3422) +++ cpu/arm/olpc/accelerometer.fth Wed Nov 14 08:11:21 2012 (r3423) @@ -76,7 +76,7 @@ \ The numbers are in units of "1LSB = 1mg", 1000 unit = 1 gravity.
d# 80 value min-x -d# 80 value min-y +d# 20 value min-y d# 80 value min-z d# 1700 value max-x d# 1700 value max-y @@ -132,12 +132,14 @@ delay ( ) average-acceleration@ ( x y z )
+[ifdef] notyet \ Check that the magnitude of the acceleration vector is about 1 G 3dup not1g? if ( x y z ) 3drop ( ) ." Acceleration is not 1 gravity" cr ( ) true exit ( -- error? ) then ( x y z ) +[then]
\ Use the device's selftest function to force a change in one direction h# 0a ctl4! ( x y z ) \ High res, Selftest mode 0 @@ -177,7 +179,7 @@ \ The attempt to talk at the old address failed, so we assume the new chip \ Support for new LIS3DHTR chip d# 400,000 to bus-speed - d# 80 to min-x d# 80 to min-y d# 80 to min-z + d# 80 to min-x d# 20 to min-y d# 80 to min-z d# 1700 to max-x d# 1700 to max-y d# 1400 to max-z h# 19 1 reg ['] lis3dhtr-selftest to lis-selftest