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robfinch |
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; ============================================================================
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; __
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; \\__/ o\ (C) 2013, 2014 Robert Finch, Stratford
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; \ __ / All rights reserved.
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; \/_// robfinch@opencores.org
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; ||
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;
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;
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; This source file is free software: you can redistribute it and/or modify
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; it under the terms of the GNU Lesser General Public License as published
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; by the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This source file is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see .
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;
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; ReadTemp.asm
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; ============================================================================
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;
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;--------------------------------------------------------------------------
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; ReadTemp
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; Read and display the temperature from a DS1626 temperature sensor
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; device. RTF65002 source code.
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;--------------------------------------------------------------------------
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DS1626_CMD =$FFDC0300
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DS1626_DAT =$FFDC0301
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; Commands
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START_CNV = $51;
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STOP_CNV = $22;
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READ_TEMP = $AA;
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READ_CONFIG = $AC;
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READ_TH = $A1;
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READ_TL = $A2;
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WRITE_TH = $01;
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WRITE_TL = $02;
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WRITE_CONFIG = $0C;
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POR = $54;
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public ReadTemp:
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lda CONFIGREC ; Do we even have a temperature sensor ?
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bit #$10
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beq rdtmp3 ; If not, output '0.000'
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rdtmp1:
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; On power up the DS1626 interface circuit sends a power on reset (POR)
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; command to the DS1626. Waiting here makes sure this command has been
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; completed.
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jsr rdt_busy_wait
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lda #$0F ; 12 bits resolution, cpu mode, one-shot mode
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sta DS1626_DAT
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lda #WRITE_CONFIG ; write the desired config to the device
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sta DS1626_CMD
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jsr rdt_busy_wait
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lda #10
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jsr tSleep
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lda #0
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sta DS1626_DAT
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lda #START_CNV ; issue a start conversion command
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sta DS1626_CMD
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jsr rdt_busy_wait
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lda #10
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jsr tSleep
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; Now poll the config register to determine when the conversion has completed.
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rdtmp2:
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lda #READ_CONFIG ; issue the READ_CONFIG command
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sta DS1626_CMD
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jsr rdt_busy_wait
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pha
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lda #10 ; Wait a bit before checking again. The conversion
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jsr tSleep ; can take up to 1s to complete.
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pla
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bit #$80 ; test done bit
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beq rdtmp2 ; loop back if not done conversion
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lda #0
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sta DS1626_DAT ; issue a stop conversion command
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lda #STOP_CNV
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sta DS1626_CMD
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jsr rdt_busy_wait
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lda #10
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jsr tSleep
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lda #READ_TEMP ; issue the READ_TEMP command
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sta DS1626_CMD
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jsr rdt_busy_wait
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pha
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lda #10
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jsr tSleep
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pla
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rdtmp4:
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jsr CRLF
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and #$FFF
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bit #$800 ; check for negative temperature
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beq rdtmp7
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sub r1,r0,r1 ; negate the number
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and #$FFF
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pha
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lda #'-' ; output a minus sign
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jsr DisplayChar
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pla
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rdtmp7:
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pha ; save off value
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lsr r1,r1,#4 ; get rid of fractional portion
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and #$7F ; strip off sign bit
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ldx #3 ; output the whole number part
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jsr PRTNUM
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lda #'.' ; followed by a decimal point
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jsr DisplayChar
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pla ; get back temp value
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and #$0F
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mul r1,r1,#625 ; 1/16th's per degree
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ldx #1
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jsr PRTNUM
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; pha ; save off fraction bits
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; div r1,r1,#1000 ; calculate the first digit
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; add #'0'
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; jsr DisplayChar ; output digit
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; pla ; get back fractions bits
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; pha ; and save again
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; div r1,r1,#100 ; shift over to second digit
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; mod r1,r1,#10 ; ignore high order bits
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; add #'0'
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; jsr DisplayChar ; display the digit
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; pla ; get back fraction
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; div r1,r1,#10
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; mod r1,r1,#10 ; compute low order digit
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; add #'0'
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; jsr DisplayChar ; display low order digit
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jsr CRLF
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rts
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rdtmp3:
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lda #0
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bra rdtmp4
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; Returns:
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; acc = value from data register
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;
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rdt_busy_wait:
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jsr KeybdGetChar
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cmp #CTRLC
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beq Monitor
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lda DS1626_DAT
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bit #$8000
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bne rdt_busy_wait
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rts
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tSleep:
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ldx Milliseconds
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txa
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tSleep1:
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ldx Milliseconds
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sub r2,r2,r1
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cpx #100
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blo tSleep1
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rts
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