RTEMS | arm/stm32f4: extend USART DR field to 9 bits (!1141)

Thu Mar 19 17:46:21 UTC 2026

Mohamed Ayman commented on a discussion on bsps/arm/stm32f4/include/bsp/stm32_usart.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141#note_146280

 >  #define STM32F4_USART_SR_FE BSP_BIT32(1)
 >  #define STM32F4_USART_SR_PE BSP_BIT32(0)
 >  	uint32_t dr;
 > -#define STM32F4_USART_DR(val) BSP_FLD32(val, 0, 7)
 > -#define STM32F4_USART_DR_GET(reg) BSP_FLD32GET(reg, 0, 7)
 > -#define STM32F4_USART_DR_SET(reg, val) BSP_FLD32SET(reg, val, 0, 7)
 > +#define STM32F4_USART_DR(val) BSP_FLD32(val, 0, 8)
 > +#define STM32F4_USART_DR_GET(reg) BSP_FLD32GET(reg, 0, 8)
 > +#define STM32F4_USART_DR_SET(reg, val) BSP_FLD32SET(reg, val, 0, 8)

done, I’ve applied the 9-bit changes to match the hardware, and all DR in uart.c reads and writes in the driver are now explicitly masked to 8 bits to preserve existing console behavior.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1141#note_146280
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