Mohamed Ayman created a merge request:
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141
Project:Branches: mohamedayman23/rtems:extend-USART-DR-field-to-9-bits to
rtems/rtos/rtems:main
Author: Mohamed Ayman
## Summary
arm/stm32f4: extend USART DR field to 9 bits
The STM32F4 USART data register supports up to 9-bit data when CR1.M is set.
The current DR macros mask only bits \[7:0\], which truncates the MSB in 9-bit
mode. Extend the field width to \[8:0\] to match the hardware definition while
remaining compatible with 8-bit mode.
## {width=812
height=600}
AI usage: yes\
Prompt used: check the registers by the USART register map which i include\
AI model: GPT-5 mini\
How AI was used: just for checking if this registers a valid to the this family
reference manual or there is copy-paste issue
--
View it on GitLab:
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141
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