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Ds2438 fixes #35

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Ds2438 fixes #35

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ac544de
Fix 2's complement calculation for Vsense.
ukuehn Oct 25, 2021
ba26c08
Merge branch 'master' into ds2438-fixes
ukuehn Feb 1, 2023
4d64342
Use correct register width for current register.
ukuehn Mar 12, 2023
a55f570
Merge branch 'master' into ds2438-fixes
bcl Mar 12, 2023
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11 changes: 9 additions & 2 deletions userial/ad26.c
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Original file line number Diff line number Diff line change
Expand Up @@ -251,10 +251,17 @@ float Volt_Reading(int portnum, int vdd, int *cad)
if(cad) {

/* Get Current reading as well */
/* convert from 12-bit 2's complement, see
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* https://en.wikipedia.org/wiki/Two%27s_complement
*/
c = send_block[8] & 0x3;

*cad = (c << 8) | send_block[7];
if(send_block[8] & 0x4) *cad = - *cad;
if(send_block[8] & 0x4) {
/* Negative value represented by set sign bit
* with weight of -2^12
*/
*cad = *cad - 4096;
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}

// printf("CAD=%d\n", *cad);
}
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