8e9e64ccbe
git-svn-id: https://svn.salfter.gotdns.org/svn/a2bfc/trunk@82 1b90f75b-8b96-4784-87c0-14078182fce6
31 lines
663 B
C
31 lines
663 B
C
#include "ow-temp.h"
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short ow_temp_read(unsigned char* devid, unsigned char format)
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{
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unsigned char t1, t2;
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short rawtemp;
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if (devid[0]!=40)
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return OW_ERR_INVALIDDEVICE;
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ow_selectdevice(devid);
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ow_writebyte(68); // ask for a temperature reading
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ow_wait(); // wait for operation to complete
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ow_selectdevice(devid);
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ow_writebyte(190); // retrieve the reading
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t1=ow_readbyte();
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t2=ow_readbyte();
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ow_reset();
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rawtemp=(short)(t1+((int)t2<<8));
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switch (format)
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{
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case OW_TEMP_FAHRENHEIT:
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return (rawtemp*9+8)/80+32;
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case OW_TEMP_CELSIUS:
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return (rawtemp+8)>>4;
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case OW_TEMP_RAW:
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default:
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return rawtemp;
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}
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}
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