Guru
Joined: 07/11/2023
Location: United KingdomPosts: 1999
| Posted: 08:08am 09 Jul 2025 |
Ah, not related, for me.
In my case, 32 bits of encoder position is more than enough. Out of all of the commercially available motion-controllers, I know of only one that has a 64-bit range.
However, I did experiment with this and here's my method:
DIM cn32 AS integer ' 64-bit variable
DIM pr32 AS integer
DIM roct AS integer ' roll-over counter
DIM cn64 AS integer
dim fin as float
pr32 = 0
roct = 0
cn64 = 0
' Read the current 32-bit counter value
'counter32 = ReadCounter32()
timer=0
for i = 1 to 1000
cn32 = 4294967292
IF cn32 > 2147483647 THEN
cn32 = cn32 - 4294967296 ' 2^32
END IF
IF cn32 < pr32 - 2147483648 THEN
roct = roct + 1
ELSEIF cn32 > pr32 + 2147483648 THEN
roct = roct - 1
END IF
cn64 = (roct * 4294967296) + cn32
pr32 = cn32
next
fin=timer
' Output the extended counter value
PRINT "Extended Counter: "; cn64; fin/1000
DIM pr32 AS integer
DIM roct AS integer ' roll-over counter
DIM cn64 AS integer
dim fin as float
pr32 = 0
roct = 0
cn64 = 0
' Read the current 32-bit counter value
'counter32 = ReadCounter32()
timer=0
for i = 1 to 1000
cn32 = 4294967292
IF cn32 > 2147483647 THEN
cn32 = cn32 - 4294967296 ' 2^32
END IF
IF cn32 < pr32 - 2147483648 THEN
roct = roct + 1
ELSEIF cn32 > pr32 + 2147483648 THEN
roct = roct - 1
END IF
cn64 = (roct * 4294967296) + cn32
pr32 = cn32
next
fin=timer
' Output the extended counter value
PRINT "Extended Counter: "; cn64; fin/1000