Content originally posted in LPCWare by [email protected] on Thu Aug 27 21:47:03 MST 2015 Has anybody encounter the problem that the POS register never change and the actual position is reported in the INXCNT register instead? So where is the actual index count register?
I had no such problem with the QEI in LPC1768 for another project.
Content originally posted in LPCWare by R2D2 on Fri Aug 28 09:20:58 MST 2015 Quote: [email protected] That's a very strange and unexpected behavior. The user manual is misleading too.
UM: Quote: 22.6.2.2 QEI Maximum Position register This register contains the maximum value of the encoder position.
So with MAXPOS = 0, POS is counting from 0 to 0 :D
Content originally posted in LPCWare by [email protected] on Fri Aug 28 09:08:06 MST 2015 Good call! Once I set the MAXPOS, POS reports correctly and INXCNT stays at 0. That's a very strange and unexpected behavior. The user manual is misleading too.
Thanks. Sam.
22.6.2.6 22.6.2.7 22.6.2.8 22.6.2.9 QEI Index Count register This register contains the current value of the encoder position. Increments or decrements when encoder counts occur, depending on the direction of rotation. Table 306. QEI Index Count register (INXCNT, address 0x4005 8020) bit description Bit Symbol Description Reset value 31:0 ENCPOS Current encoder position value. 0
Content originally posted in LPCWare by R2D2 on Thu Aug 27 23:41:46 MST 2015 Quote: [email protected] Has anybody encounter the problem that the POS register never change and the actual position is reported in the INXCNT register instead?
