rusefi
/
rusefi
mirror of https://github.com/rusefi/rusefi.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

max3185x: fix negative values for max31856

This commit is contained in:
Andrey Gusakov 2024-03-10 19:16:10 +03:00 committed by rusefillc
parent 417addb3ba
commit 9f187ef455
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
firmware/hw_layer/sensors/max3185x.cpp
View File

@ -357,12 +357,21 @@ private:
}
if (temp) {
*temp = (float)((rx[3] << 11) | (rx[4] << 3) | (rx[5] >> 5)) / 128.0;
// 10 bit before point and 7 bits after
int32_t tmp = (rx[3] << 11) | (rx[4] << 3) | (rx[5] >> 5);
/* extend sign: move top bit 18 to 31 */
tmp = tmp << 13;
tmp = tmp >> 13; /* shifting right signed is not a good idea */
*temp = ((float)tmp) / 128.0;
}
/* convert float to int */
if (coldJunctionTemp) {
*coldJunctionTemp = (float)(rx[1] << 8 | rx[2]) / 256.0;
int16_t tmp = (rx[1] << 6) | (rx[2] >> 2);
/* extend sign */
tmp = tmp << 2;
tmp = tmp >> 2; /* shifting right signed is not a good idea */
*coldJunctionTemp = ((float)tmp) / 64.0;
}
return MAX3185X_OK;