TMS320F28379D: speed measurement on CPU2

Hi,

Did you also configure CPUSEL2.EQEP1 to "1" so that ownership of eQEP1 now belongs to CPU2 to read register content and be able to calculate POSSPEED?

Best Regards,

Nirav

Hi 

I added "DevCfgRegs.CPUSEL2.bit.EQEP1 = 1;" to begining of main_cpu1.

In addition, I added "CpuSysRegs.PCLKCR4.bit.EQEP1 = 1;" to begining of main_cpu2.

However, the speed value still cannot be measured.

Even though I run the following code for qep registers in cpu2 (POSSPEED_Init), I see that

these registers do not change (all values are 0) in the Expressions window of cpu2.

void POSSPEED_Init()
{

EQep1Regs.QUPRD=2000000; // Unit Timer for 100Hz at 200 MHz SYSCLKOUT

EQep1Regs.QDECCTL.bit.QSRC=00; // QEP quadrature count mode

EQep1Regs.QEPCTL.bit.FREE_SOFT=2;
EQep1Regs.QEPCTL.bit.PCRM=00; // PCRM=00 mode - QPOSCNT reset on index event
EQep1Regs.QEPCTL.bit.UTE=1; // Unit Timeout Enable
EQep1Regs.QEPCTL.bit.QCLM=1; // Latch on unit time out
EQep1Regs.QPOSMAX=0xffffffff;
EQep1Regs.QEPCTL.bit.QPEN=1; // QEP enable

EQep1Regs.QCAPCTL.bit.UPPS=5; // 1/32 for unit position
EQep1Regs.QCAPCTL.bit.CCPS=6; // 1/64 for CAP clock
EQep1Regs.QCAPCTL.bit.CEN=1; // QEP Capture Enable

}

Hi

My main program of CPU1 is as follow.

void main(void)

{

//--- CPU Initialization

InitPieCtrl(); // Initialize and enable the PIE (FILE: PieCtrl.c)

InitWatchdog(); // Initialize the Watchdog Timer (FILE: WatchDog.c)

DevCfgRegs.CPUSEL2.bit.EQEP1=1;

//--- Enable global interrupts

asm(" CLRC INTM, DBGM"); // Enable global interrupts and realtime debug

//--- Clear IPC1 Flag

   IpcRegs.IPCCLR.bit.IPC1 = 1;

   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

//--- Enable IPC PIE interrupts

   PieCtrlRegs.PIEIER1.bit.INTx14 = 1; // Enable IPC1 ISR

IER |= 0x0001;                          // Enable INT1 in IER to enable PIE group 1

//--- Let CPU1 know that CPU2 is ready

IpcRegs.IPCSET.bit.IPC17 = 1; // Set IPC17 to release CPU1

//--- Enable global interrupts

asm(" CLRC INTM, DBGM"); // Enable global interrupts and realtime debug

while(1) // endless loop - wait for an interrupt

{

asm (" NOP");

}

}

My main program of CPU2 is as follow.

void main(void)

{

//--- CPU Initialization

InitSysCtrl(); // Initialize the CPU (FILE: SysCtrl.c)

InitGpio(); // Initialize the shared GPIO pins (FILE: Gpio.c)

InitPieCtrl(); // Initialize and enable the PIE (FILE: PieCtrl.c)

InitWatchdog(); // Initialize the Watchdog Timer (FILE: WatchDog.c)

CpuSysRegs.PCLKCR4.bit.EQEP1=1;

//--- Peripheral Initialization

InitAdca(); // Initialize the ADC-A (FILE: Adc.c)

InitDacb();                         // Initialize the DAC-B (File: Dac.c)

InitEPwm(); // Initialize the EPwm (FILE: EPwm.c)

inithiz();

//--- Clear IPC Flags

IpcRegs.IPCCLR.all = 0xFFFFFFFF;

//--- Wait here until CPU2 is ready

while (IpcRegs.IPCSTS.bit.IPC17 == 0) ; // Wait for CPU2 to set IPC17

IpcRegs.IPCACK.bit.IPC17 = 1; // Acknowledge and clear IPC17

//--- Enable global interrupts

asm(" CLRC INTM, DBGM"); // Enable global interrupts and realtime debug

//--- Main Loop

while(1) // endless loop - wait for an interrupt

{

asm (" NOP");

}

}

Best regards.

Hi Nirav,

You are right.  In my code, access to eqep register by CPU2 is blocked. I solved this problem with "eallow" and "edis". Thanks for your interest.

Best regards.