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stm32/usart: Implemented a function to get the current databits setting for a USART

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This commit is contained in:
dragonmux
2022-08-15 17:57:51 +01:00
committed by Piotr Esden-Tempski
parent 189017b25c
commit 0241982fb4
2 changed files with 22 additions and 0 deletions
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1
include/libopencm3/stm32/common/usart_common_all.h
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@@ -100,6 +100,7 @@ BEGIN_DECLS
void usart_set_baudrate(uint32_t usart, uint32_t baud);
void usart_set_databits(uint32_t usart, uint32_t bits);
uint32_t usart_get_databits(uint32_t usart);
void usart_set_stopbits(uint32_t usart, uint32_t stopbits);
void usart_set_parity(uint32_t usart, uint32_t parity);
void usart_set_mode(uint32_t usart, uint32_t mode);

21
lib/stm32/common/usart_common_all.c
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@@ -95,6 +95,27 @@ void usart_set_databits(uint32_t usart, uint32_t bits)
}
}
/*---------------------------------------------------------------------------*/
/** @brief USART Get Word Length.
The word length is set to 8 or 9 bits. Note that the last bit will be a parity
bit if parity is enabled, in which case the data length will be 7 or 8 bits
respectively.
@param[in] usart unsigned 32 bit. USART block register address base @ref
usart_reg_base
@returns unsigned 32 bit Word length in bits 8 or 9.
*/
uint32_t usart_get_databits(uint32_t usart)
{
const uint32_t reg32 = USART_CR1(usart) & USART_CR1_M;
if (reg32)
return 9;
else
return 8;
}
/*---------------------------------------------------------------------------*/
/** @brief USART Set Stop Bit(s).