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annotate code_part1/OSTC_code_asm_part1/spbrgselect.inc @ 336:9ee86a19f1fa ScreenDump

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author JeanDo
date Mon, 16 May 2011 23:52:38 +0200
parents 96a35aeda5f2
children
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1 RoundResult SET 0 ; Rounding function. RoundResult = Round(aa/bb)
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2 Round macro aa,bb
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3 LOCAL rr = aa/bb
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4 LOCAL d1 = aa - rr*bb
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5 LOCAL d2 = (rr+1)*bb - aa
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6 RoundResult = rr
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7 if d1 >= d2
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8 RoundResult++
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9 endif
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10 endm
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11
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12 AbsResult SET 0
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13 Abs macro nr
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14 if nr>=0
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15 AbsResult = nr
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16 else
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17 AbsResult = -nr
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18 endif
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19 endm
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20
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21 Round xtal,(16*baud)
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22 spbrg_value EQU RoundResult-1
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23
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24 Round xtal,(16*(spbrg_value+1))
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25 baud_real EQU RoundResult
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26 Abs(baud_real-baud)
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27 errpercent EQU AbsResult*100/baud
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28 if errpercent > 4
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29 ERROR big error in baudrate: #v(errpercent)%
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30 endif
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31 if errpercent >= 2
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32 messg baudrate not exact: #v(errpercent)%
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33 endif