ST STM32F31xx

Universal synchronous asynchronous receiver
transmitter (USART)
UM1581
552/584
DocID023800 Rev 1
Function Description
Configures the USART's DE polarity.
Parameters
 USARTx : Select the USART peripheral. This parameter can
be one of the following values: USART1 or USART2 or
USART3 or UART4 or UART5.
 USART_DEPolarity : specifies the DE polarity. This
parameter can be one of the following values:
 USART_DEPolarity_Low :
 USART_DEPolarity_High :
Return values
 None.
Notes
 None.
23.2.15.3 USART_SetDEAssertionTime
Function Name
void USART_SetDEAssertionTime ( USART_TypeDef *
USARTx, uint32_t USART_DEAssertionTime)
Function Description
Sets the specified RS485 DE assertion time.
Parameters
 USARTx : Select the USART peripheral. This parameter can
be one of the following values: USART1 or USART2 or
USART3 or UART4 or UART5.
 USART_AssertionTime : specifies the time between the
activation of the DE signal and the beginning of the start bit
Return values
 None.
Notes
 None.
23.2.15.4 USART_SetDEDeassertionTime
Function Name
void USART_SetDEDeassertionTime ( USART_TypeDef *
USARTx, uint32_t USART_DEDeassertionTime)
Function Description
Sets the specified RS485 DE deassertion time.
Parameters
 USARTx : Select the USART peripheral. This parameter can
be one of the following values: USART1 or USART2 or
USART3 or UART4 or UART5.
 USART_DeassertionTime : specifies the time between the
middle of the last stop bit in a transmitted message and the