TMS320F28377D: EQEP encoder use on CPU2

Norbert Klaes

Prodigy 80 points

Part Number: TMS320F28377D
Other Parts Discussed in Thread: C2000WARE

Hello folks,

we have treid to move the encoder calculation of speed and position from CPU1 to CPU2.

On CPU1 everything is working fine according the TI-example "eqep_pos_speed_cpu01".

Seeking to transfer the operation to CPU2 we did the following:

1. in GPIO.c of CPU1 of the TI-example we changed

GPIO_SetupPinMux(20, GPIO_MUX_CPU1, 0);

GPIO_SetupPinMux(20, GPIO_MUX_CPU2, 0);

and accordingly for channel B(Pin21), C(Pin22) and Reset(Pin23)

2. during initialization we added

DevCfgRegs.CPUSEL2.bit.EQEP1 = 1; // 0 for CPU1 and 1 for CPU2

3. POSSPEED_Init and POSSPEED_calc are called from CPU2

However speed and position on CPU2 are always zero.

Is there anythong else we have to do for POSSPEED calculation on CPU2.?

We are thankful for any hint and advice.

over 7 years ago

0 Nirav Ginwala over 7 years ago

TI__Genius 15385 points

Hi Nokla,

Few questions:

1. I assume you build and compiled your test case with CPU2?
2. What is CPU1 doing while CPU2 is running?
3. Are you using IPC for handshake between CPU1 and CPU2?

You can also refer to example that runs both CPUs in parallel for proper handshake.

C:\ti\c2000\C2000Ware_1_00_05_00\device_support\f2837xd\examples\dual\blinky_dc

Regards,
Nirav

0 Norbert Klaes over 7 years ago in reply to Nirav Ginwala

Prodigy 80 points

Hi Nirav,

both CPU´s are running fine. They can axchange data and do their normal job. It´s only the EQEP-Registers, that don´t show reasonable results on CPU2.

Regards

0 Nirav Ginwala over 7 years ago in reply to Norbert Klaes

TI__Genius 15385 points

Hi Nokla,

Ok, good. Did you try debugging the code and making sure the eQEP is configured properly by CPU2 as it is done by CPU1?

Regards,

Nirav

0 Nirav Ginwala over 7 years ago in reply to Nirav Ginwala

TI__Genius 15385 points

Hi Nokla,

Are you still seeing issue with CPU2?

Regards,
Nirav

0 Norbert Klaes over 7 years ago in reply to Nirav Ginwala

Prodigy 80 points

Hi Nirav,

the probelm could be solved by adding the enabling of the peripheral clock for EQEP1 on CPU2.

We added

CpuSysRegs.PCLKCR4.bit.EQEP1 = 1

in Init.c of CPU2.

The function InitPeripheralClocks() of the system file F2837xD_SysCtrl.c enables only the peripheral clock if CPU1 is defined.

Regards

nokla

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TMS320F28377D: EQEP encoder use on CPU2