Hi,
I try to use eQEP1A_in and eQEP1B_in of AM3358 CPU just to count incoming encoder pulses and to reset them from time to time. No interrupts/overflow/capture/whatever is needed beside of that. That's what I already have done to program QEP1:
QEPPinMux(); // set input pins to be used with QEP HWREGH(SOC_EQEP_1_REGS+QEP_QDECCTL)=0x0800; //set Quadrature-count mode using QSRC HWREGH(SOC_EQEP_1_REGS+QEP_QEPCTL) =0x1038; //position counter initialisation: writing a 1 to the QEPCTL[SWI] bit HWREG(SOC_EQEP_1_REGS+QEP_QPOSMAX) =0xFFFFFFFF; // maximum value HWREG(SOC_EQEP_1_REGS+QEP_QPOSINIT)=0x00000000; //initial value HWREGH(SOC_EQEP_1_REGS+QEP_QCAPCTL)=0x0000; //disable all capturing functions HWREGH(SOC_EQEP_1_REGS+QEP_QEPCTL) =0x10B8; //reset counter
SOC_EQEP_1_REGS is equal to (0x48302000+0x00000180) which should be correct base address of QEP1 registers. From what I understood from TRM this procedure should give me the possibility to read current encoder count out of register QEP_QPOSCNT and to reset the current value by writing 0x10B8 to register QEP_QEPCTL.
But as soon as I read from address (SOC_EQEP_1_REGS+QEP_QPOSCNT) the CPU stops completely, reading of the value fails.
So...anybody an idea what could be wrong? Is there a problem with my initislisation?
