As already mentioned all USART drivers implemented for various platforms included in TF-M are not compliant with CMSIS USART Driver specification. They implement blocking send/receive and no power on/off.
Drivers should be rewritten and should pass the CMSIS Driver Validation.
| Status | Assigned | Task | ||
|---|---|---|---|---|
| Resolved | davidwang | T532 TF-M / CMSIS-Pack Alignment | ||
| Resolved | mingyangSun | T541 USART driver implementations for platforms included in TF-M |
Hi, @RobertRostohar
If we remove the "FILE _stdout" declaration from uart_stdout.c as mentioned(It prevents Clib mutex initialization), ARMCLANG image will not output anything anymore.
As the example shown in the link:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.100073_0613_00_en/chr1358938930615.html
"FILE _stdout" is needed for retargeting.
We do not have the same environment(CMSIS-Pack with MDK environment) to reproduce the output in your environment.
Wonder if you knew the root cause of why "FILE __stdout" prevents Clib mutex initialization?
It seems that we can reimplement low level I/O functions such as _sys_write() and _ttywrch(). In that way, we do not need to declare "FILE __stdio".
besides CMSIS USART driver compliant work, also remove printing with SVC together.
CMSIS compliant (relying on patches that remove SVC print):
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2489
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2955
remove printing with SVC:
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2933
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2934
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2935
https://review.trustedfirmware.org/c/trusted-firmware-m/+/2936
I truly had an amazing time with this agency's high-class Saket escort. She was charming and the overall experience was great. If you want discreet and good quality Saket Escorts, look no further than this agency. Highly recommend it for men in search of real pleasure.
This is amazing, I’ve learned so much today. Love how this slope game at [url=https://onlineslope.net/]slope[/url] helps me unwind during short breaks - refreshing and addictive.
Challenge your skills in this incredible slope game at [url=https://onlineslope.net/]slope[/url]- beautiful graphics and addictive gameplay combined perfectly.
Workwear should be both comfortable and visually appealing, and custom hoodies provide both. Embroidered and printed logos enhance brand recognition. Soft, durable materials ensure long-term wearability. Employees and customers appreciate well-branded apparel. Invest in high-quality customised hoodies for your team.