Hi Poppy,
First-Level Interrupt Handling (FLIH) should be recommended in your use case as you have latency requirements.
Here is an example:
You’ll firstly need to add an “irq” item in the manifest and “handling” it with “FLIH”:
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:
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
Macronix Microelectronics (Suzhou) Co.,Ltd
旺宏微电子（苏州）有限公司
http://www.mxic.com.cn
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