Hi Kevin,

Thanks for your instruction.

We're developing an application RoT partition which access a sensor via an SPI interface(Based on RA6M4_EK development board). After commands have been transferred to the sensor,
an SPI_TX_INTERRUPT should be triggered, then calls spi_tx_isr().

Now let's put aside binding secure interrupts to each secure partition, just talk about how to enable SPI interrupts in secure world simply.

Here is my implementation:

1.Configure this SPI peripheral as secure peripheral.
2.Assign SPI tx and rx interrupts to secure state by setting NVIC->ITNS register.
3.Enable SPI tx and rx interrupts by seeting NVIC->ISER register.

But during debug, I found that spi0_tx_isr() (The ISRs are also placed under this application RoT partition's folder) has never been triggered. Is there anything that I miss?




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


Kevin Peng via TF-M <tf-m@lists.trustedfirmware.org>

2022/05/17 09:45
Please respond to
Kevin Peng <Kevin.Peng@arm.com>
To
Edward Yang <EdwardYang@mxic.com.cn>, "tf-m@lists.trustedfirmware.org" <tf-m@lists.trustedfirmware.org>
cc
Subject
[TF-M] Re: Enable SPI interrupt in secure partition





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/suites/spm/irq/service/tfm_flih_test_service
 
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/suites/spm/irq/service/tfm_flih_test_service/tfm_flih_test_service.yaml#n33
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/suites/spm/irq/service/tfm_flih_test_service/tfm_flih_test_service.c#n15
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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