Hi Poppy,

First-Level Interrupt Handling (FLIH) should be recommended in your use case as you have latency requirements. Here is an example: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit...

You’ll firstly need to add an “irq” item in the manifest and “handling” it with “FLIH”: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit... And also add the “mmio_regions” item with the associated device (SPI) to give access permissions to the Secure Partition.

The IRQ handling should be in the Secure Partition: https://git.trustedfirmware.org/TF-M/tf-m-tests.git/tree/test/secure_fw/suit... Note that, no PSA APIs are allowed in the handling.

Best Regards, Kevin

From: Edward Yang via TF-M tf-m@lists.trustedfirmware.org Sent: Monday, May 16, 2022 5:38 PM To: tf-m@lists.trustedfirmware.org Subject: [TF-M] Enable SPI interrupt in secure partition

Hi experts,

Recently we're developing a demo based on TF-M, this demo involves using SPI module to drive a sensor by sending commands in a secure partition.

And we need to enable SPI receive and send interrupt in this secure partition and the latency shall be as small as possible. I am wondering how to implement this secure interrupts. Is there any example code or instrucstions?

Thanks.

Best Regards, Poppy Wu 吴偏偏

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