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maxds3231m :: fix to getTemperature method

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Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>
This commit is contained in:
Kiveisha Yevgeniy 2014-08-04 12:00:58 +03:00
parent 574a39d3c1
commit 58b80f6b58
1 changed files with 9 additions and 4 deletions
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13
src/maxds3231m/maxds3231m.cxx
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@ -86,13 +86,18 @@ MAXDS3231M::getDate (Time3231 &time) {
uint16_t uint16_t
MAXDS3231M::getTemperature () { MAXDS3231M::getTemperature () {
uint8_t buffer[2]; uint8_t buffer[2];
uint16_t tempRaw = 0; uint8_t msb = 0;
uint8_t lsb = 0;
i2cReadReg_N (TEMPERATURE_ADDR, 2, buffer); i2cReadReg_N (TEMPERATURE_ADDR, 2, buffer);
tempRaw = (((int16_t)buffer[0]) << 8) | buffer[1]; msb = buffer[0];
lsb = buffer[1] >> 6;
return tempRaw; if ((msb & 0x80) != 0)
msb |= ~((1 << 8) - 1); // if negative get two's complement
return 0.25 * lsb + msb;
} }
/* /*