TMS320C6678: SRIO, Doorbell, Interrupt .How can I receive the Doorbell as an interrupt?

jaehong kim

Part Number: TMS320C6678

Tool/software:

I modified the LoopbackDioIsr.c example on the C6678 so that Core 0 performs an SWRITE to DDR3, and Core 1 reads it using NREAD.

After the SWRITE, I want to send a doorbell so that Core 1 receives it as an interrupt, triggering the NREAD operation.

My Questions:

How can I receive the Doorbell as an interrupt?
- The LoopbackDioIsr.c example receives LSU interrupts regardless of whether it is triggered by NWRITE, NREAD, or SWRITE.
- I only want to receive doorbell interrupts. How can I achieve this?
When do INTDST0~23 receive interrupts?
- How can I determine under what conditions INTDST0~23 receive interrupts?
Can I modify the interrupt conditions for INTDST0~23?
- If it is possible to modify the interrupt conditions, I would like to adjust them to suit my requirements.

18 days ago

0 Praveen Rao 18 days ago

TI__Mastermind 43472 points

Hi,

To understand & support your query, we would like to know the TI SDK being used? Also, is this a new or existing project? Can you described the use case in detail on why this is required? Also, have you looked into the device documents, if yes - which ones?

Thanks

0 jaehong kim 17 days ago in reply to Praveen Rao

Prodigy 10 points

I am using pdk_c667x_2_0_16.

In the future, when the FPGA performs SWRITE to DDR3 and sends a Doorbell, the DSP will receive the Doorbell as an interrupt and then perform NREAD to read from DDR3.

Currently, since the FPGA is not yet ready, I am testing by having the C6678 perform an SWRITE to DDR3 and send a Doorbell in loopback mode. This Doorbell is received as an interrupt, triggering another SWRITE.

I am using the following code to route Intdst16~ to the Doorbell register and bit:
for (i = 0; i < 16; i++)
{
CSL_SRIO_RouteDoorbellInterrupts(hSrioCSLRX, 0, i, 0);
CSL_SRIO_RouteDoorbellInterrupts(hSrioCSLRX, 1, i, 1);
CSL_SRIO_RouteDoorbellInterrupts(hSrioCSLRX, 2, i, 2);
CSL_SRIO_RouteDoorbellInterrupts(hSrioCSLRX, 3, i, 3);
}

However, despite receiving the Doorbell, the interrupt is not triggered.

How can I resolve this issue?

And I am not even sure if the Doorbell is being transmitted correctly.

If I set doorbell val = 1, shouldn't the Doorbell be sent together with the SWRITE?