jstampfl / pruiep_int

AM335x PRUSS IEP interrupt

PruIEP_Int 3 examples

Examples of using the PRUSS IEP timer interrupt on the BEAGLEBONE to toggle a pin.

notes - comments about this example

iepx.c - Initialize the Pruss, initializes the interrupt system, waits for the pru to finish executionjj

iepx.p - The PRUSS initializes the IEP interrupt for CMP0 (compare register 0). Toggles pin on interrupt

prujts1-00A0.dts - The device tree overlay to enable the PRUSS and set P9.31 for Pru output.

iep2.c - Initialize the Pruss, initializes the interrupt system, waits for the pru to finish executionjj

iep2.p - The PRUSS initializes the IEP interrupt for CMP0 (compare register 0). and CMP1 On CMP1 interrupt clear the pin, on CMP0 set the pin and reset the counter.

ieps.c - Initialize the Pruss, waits 30 seconds and exits. Does not initialize the PRUSS INTC

ieps.p - Initialize the PRUSS INTC interrupt system. Initializes the IEP interrupts for CMP0 & CMP1. Toggles P9.31 using interrupts form CMP0 & CMP1.

pruiep_int's Issues

Is PRU IEP supported on BeagleBone Blacks with AM3358?

I've got a BeagleBone Black, which officially has an AM3358, although some apparently were loaded with AM3359, and the BeagleBone white has an AM3359.

Looking in the AM3358 TRM, section 1.1.1 Device Features, for the PRU it says "All features excluding EtherCAT". For AM3359 it says "including EtherCAT". Then in section 4.1.1 PRU Features, it says:

• One Industrial Ethernet Peripheral (IEP) to manage/generate Industrial Ethernet functions
  • One Industrial Ethernet timer with 10 capture* and eight compare events
  • Two Industrial Ethernet sync signals*
  • Two Industrial Ethernet 16-bit watchdog timers*
  • Industrial Ethernet digital IOs

...
NOTE: * — Module or feature is used by industrial protocols, such as EtherCAT. For availability of
EtherCAT, see the device features in Chapter 1, Introduction.

It is ambiguous whether the IEP is not present or partially present for the AM3358.

So the question is, can the PRU IEP be used for the BeagleBone Blacks with AM3358?