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annotate src/isr.inc @ 250:20e3bad0b0f2

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Graphical compass from kovacs
author heinrichsweikamp
date Wed, 18 Mar 2015 16:42:49 +0100
parents 11d4fc797f74
children ca4556fb60b9
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1 ;=============================================================================
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2 ;
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3 ; File isr.inc
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4 ;
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5 ;
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6 ; Copyright (c) 2011, JD Gascuel, HeinrichsWeikamp, all right reserved.
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7 ;=============================================================================
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8 ; HISTORY
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9 ; 2011-08-06 : [mH] moving from OSTC code
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10
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11 SAFE_2BYTE_COPY MACRO from, to
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12 local retry
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13 retry:
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14 movff from+1,WREG ; High byte in W.
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15 movff WREG,to+1 ; and destination.
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16 movff from+0,to+0 ; Copy low byte.
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17 movff from+1,TABLAT ; another bank-safe read.
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18 xorwf TABLAT,W ; High byte changed ?
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19 bnz retry
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20 ENDM