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arm/stm32f4: extend USART DR field to 9 bits

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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
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5
bsps/arm/stm32f4/console/usart.c
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@@ -60,7 +60,8 @@ static void stm32f4_usart_interrupt(void *arg)
while ((usart->sr & STM32F4_USART_SR_RXNE) == STM32F4_USART_SR_RXNE) 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)); 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); volatile stm32f4_usart *usart = usart_get_regs(ct);
if ((usart->sr & STM32F4_USART_SR_RXNE) != 0) { if ((usart->sr & STM32F4_USART_SR_RXNE) != 0) {
return STM32F4_USART_DR_GET(usart->dr); return STM32F4_USART_DR_GET(usart->dr) & 0xFF;
} else { } else {
return -1; 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_FE BSP_BIT32(1)
#define STM32F4_USART_SR_PE BSP_BIT32(0) #define STM32F4_USART_SR_PE BSP_BIT32(0)
uint32_t dr; uint32_t dr;
#define STM32F4_USART_DR(val) BSP_FLD32(val, 0, 7) #define STM32F4_USART_DR(val) BSP_FLD32(val, 0, 8)
#define STM32F4_USART_DR_GET(reg) BSP_FLD32GET(reg, 0, 7) #define STM32F4_USART_DR_GET(reg) BSP_FLD32GET(reg, 0, 8)
#define STM32F4_USART_DR_SET(reg, val) BSP_FLD32SET(reg, val, 0, 7) #define STM32F4_USART_DR_SET(reg, val) BSP_FLD32SET(reg, val, 0, 8)
uint32_t bbr; uint32_t bbr;
#define STM32F4_USART_BBR_DIV_MANTISSA(val) BSP_FLD32(val, 4, 15) #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) #define STM32F4_USART_BBR_DIV_MANTISSA_GET(reg) BSP_FLD32GET(reg, 4, 15)