Simple DS1621 temperature acquisition.
Diff: ds1621.cpp
- Revision:
- 0:d1667b4536dd
- Child:
- 1:bef707045d41
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ds1621.cpp Sat Mar 05 20:35:01 2011 +0000 @@ -0,0 +1,39 @@ +/*********************************************************** +Author: Dupuy Bruno +Date: 5 mars 2001 +Version: beta +************************************************************/ +#include "ds1621.h" + +DS1621::DS1621(I2C* interface, uint8_t address, Serial* pc) { + if (dbx) dbx->printf("Constructor DS1621\n\r"); + i2c = interface; + dbx = pc; +} + +float DS1621::getTemp(uint8_t address) { // Return degrees C (-55 to +125) + if (dbx) dbx->printf("DS1621::getTemp DS1621 address=0x%X\n\r",address); + float temperature; + uint16_t temp16; + char temp8[2]; + int8_t data; + address &= 0x0E; + data = 0xEE; + i2c->write(DS1621_Write|address,(char *)&data,sizeof(data)); + data = 0xAA; + i2c->write(DS1621_Write|address,(char *)&data,sizeof(data)); + i2c->read(DS1621_Read|address, temp8 ,sizeof(temp8), false); + // Format temperature + temp16 = temp8[0]; + temp16 = temp16 << 1; + temp16 = temp16 + (temp8[1] >> 7); + if ((temp16 & 0x100) == 0) { // + + temperature = ((float) temp16 / 2); + } else { // - + temp16 = ~temp16 & 0xFF; + temperature = ((float) temp16 / 2); + temperature = -1.0 * temperature; + } + if (dbx) dbx->printf("temp8[0]=0x%X, temp8[1]=0x%X, temp16=0x%X\n\r",temp8[0],temp8[1],temp16); + return temperature; +} \ No newline at end of file