Mirrors_Framework/rtems
1
0
Fork 0
mirror of https://gitlab.rtems.org/rtems/rtos/rtems.git synced 2026-03-24 13:00:30 +08:00
Code Issues Packages Projects Releases Wiki Activity

arm/stm32f4: extend USART DR field to 9 bits

Browse Source 
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.
This commit is contained in:
Mohamed Ayman
2026-03-16 17:44:24 +02:00
committed by Kinsey Moore
parent 0e86a5de8e
commit 1097e00b5f
2 changed files with 6 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
bsps/arm/stm32f4/console/usart.c
View File

@@ -60,7 +60,8 @@ static void stm32f4_usart_interrupt(void *arg)
while ((usart->sr & STM32F4_USART_SR_RXNE) == STM32F4_USART_SR_RXNE)
{
char data = STM32F4_USART_DR_GET(usart->dr);
/* Mask to 8 bits to preserve existing behavior */
char data = STM32F4_USART_DR_GET(usart->dr) & 0xFF;
rtems_termios_enqueue_raw_characters(tty, &data, sizeof(data));
}
}
@@ -224,7 +225,7 @@ static int usart_read_polled(int minor)
volatile stm32f4_usart *usart = usart_get_regs(ct);
if ((usart->sr & STM32F4_USART_SR_RXNE) != 0) {
return STM32F4_USART_DR_GET(usart->dr);
return STM32F4_USART_DR_GET(usart->dr) & 0xFF;
} else {
return -1;
}

6
bsps/arm/stm32f4/include/bsp/stm32_usart.h
View File

@@ -56,9 +56,9 @@ typedef struct {
#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)
uint32_t bbr;
#define STM32F4_USART_BBR_DIV_MANTISSA(val) BSP_FLD32(val, 4, 15)
#define STM32F4_USART_BBR_DIV_MANTISSA_GET(reg) BSP_FLD32GET(reg, 4, 15)