PROCESSOR-SDK-AM65X: AM65 ICSSG1 read ICSSG0's shared memory

Rio Chan

Genius 14795 points

Part Number: PROCESSOR-SDK-AM65X

Hi Champs:

In AM65 platform, customer asks the below question:

In ICSSG1, customer wants to read some data from ICSSG0’s shared memory.

Does it can do that? And how?

According to the forum about AM47x, I think AM65 can also do it.

https://e2e.ti.com/support/processors/f/processors-forum/659580/compiler-processor-sdk-am437x-sharing-variables-across-pru-s?tisearch=e2e-sitesearch&keymatch=pru0%25252525252525252520access%25252525252525252520pru1

By using the below code.

customer cannot get any value from g_pFarPRU0.

volatile int *g_pFarPRU0 = (int *)(0x0B010000); // pointer to PRU0 shared memory

Any comments?

BR Rio

over 4 years ago

0 Vineet Roy over 4 years ago

TI__Mastermind 37435 points

Hi,

All memories including the Shared RAM are addressable via the Global memory map inside the PRU-ICSS. See this from AM65 TRM

Regards

Vineet

0 Stamp Huang over 4 years ago in reply to Vineet Roy

Prodigy 60 points

Hi Vineet,

The Table 6-342 in AM65 TRM, that just describes the offset address of each target.

But I don't know the start address of each ICSSG in each ICSSG.

If I want ICSSG0's to access ICSSG1 shared memory, how can I do?

0 Vineet Roy over 4 years ago in reply to Stamp Huang

TI__Mastermind 37435 points

Hi Stamp,

Here are the start addresses

ICSSG0 : 0x0B0 xx - xxxx

ICSSG1 : 0x0B1 xx - xxxx

ICSSG2 : 0x0B2 xx - xxxx

Use it with the local memory map shown above

See this example for IEP registers

PRU_ICSSG0_IEP0 - 0B02 E000h

PRU_ICSSG1_IEP0 - 0B12 E000h

PRU_ICSSG2_IEP0 - 0B22 E000h

If you want to access from ICSSG then load the offset directly into register and then access using the LBBO/SBBO command

Regards

Vineet

0 Stamp Huang over 4 years ago in reply to Vineet Roy

Prodigy 60 points

Now, I can read the value.

Thanks for your help.

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PROCESSOR-SDK-AM65X: AM65 ICSSG1 read ICSSG0's shared memory