[AM335x] Unable to receive PWM interrupt on PRU

Anil Kumar8

Prodigy 40 points

Setup:

ARM, PWM and PRUSS

Steps:

1. PWM configured from ARM processor for 125 usec interrupts

2. PRU interrup controller configured to received the PWM interrupt on Host interrupt 0

Issue:

I don't receive any PWM interrupt on the PRU, though on registering ISR for PWM on ARM i receive interrupt on ARM.

Details:

For configuration of PRU interrupt controller, i have used PRU DRV library on ARM side. I have tweeked this library to map the PWM interrupt to Channel 0 => to host 0.

On PRU side i am polling on the Register 31's bit 30 and 31.

I can send/recieve interrupts from ARM to PRU using the examples provided in am335x_pru_package/pru_sw/example_apps) but cannot recived interrupts on PRU from peripherals eg. PWM, CAN.

It looks that for peripheral system events, something more needs to be done which is not done by PRUSS driver library(libprussdrv).

If there is any working example involving the timers interrupts to PRU, that can also help me debug it further.

Rgds,

Anil

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Anil,

I will ask the factory team to look at this.

0 Anil Kumar8 over 11 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

Hi Biser,

Any updates on this.

Rgds,

Anil

0 Biser Gatchev-XID over 11 years ago in reply to Anil Kumar8

TI__Guru**** 393215 points

Nothing so far.

0 Jani Okker over 11 years ago in reply to Anil Kumar8

TI__Expert 3010 points

Hi Anil,

Probably you already heard through other routes that I am looking into this problem.

Would it be possible to share your modified PRU DRV with me, that can be done also offline.

Kind Regards,

Jani Okker

0 melissaw over 11 years ago in reply to Jani Okker

TI__Genius 15910 points

Hi Anil,

FYI, there is a new TI released PRU software package: http://www.ti.com/tool/pru-swpkg. The PRU software package includes an example (PRU_IEP) that uses the PRU IEP timer.

Note the examples in this package use the new PRU C compiler (available through CCSv6) and a new Linux driver based on remoteproc.

Also, here are the general steps that should be taken to configure the PRU INTC for the PWM interrupt:

HIEISR = 0; //Enable host 0
HMR0 |= 0; // Ch0 -> host0
CMR10 |= 0 << 24; // Evt43 -> Ch0
SICR = 43; // Clear evt43 (HRPWM0)
EISR = 43; // Enable evt43 (HRPWM0)
GER = 1; // Enable global interrupts

Regards,
Melissa

0 Anil Kumar8 over 10 years ago in reply to melissaw

Prodigy 40 points

We tried installing the add on package on the top of SDK package.

But the expected PRU IEP timer example is not installed.

Rdgs,

Anil

0 Anil Kumar8 over 10 years ago in reply to Jani Okker

Prodigy 40 points

Change in the PRU DRV file :

File: pruss_intc_mapping.h

Change:

#define PRU1_ARM_INTERRUPT 43

Detail: This change will map 43 system event to the channel 3 and channel 3 is mapped to PRU_EVTOUT1

Where PRU_EVTOUT1 is the Host 1 for ARM to PRU interrupts.

Rgds,

Anil

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[AM335x] Unable to receive PWM interrupt on PRU