RS485 mode function

RS485 mode function. More...

Collaboration diagram for RS485 mode function:

Functions
void	USART_DECmd (USART_TypeDef *USARTx, FunctionalState NewState)
	Enables or disables the USART's DE functionality. More...
void	USART_DEPolarityConfig (USART_TypeDef *USARTx, uint32_t USART_DEPolarity)
	Configures the USART's DE polarity. More...
void	USART_SetDEAssertionTime (USART_TypeDef *USARTx, uint32_t USART_DEAssertionTime)
	Sets the specified RS485 DE assertion time. More...
void	USART_SetDEDeassertionTime (USART_TypeDef *USARTx, uint32_t USART_DEDeassertionTime)
	Sets the specified RS485 DE deassertion time. More...

Detailed Description

RS485 mode function.

 ===============================================================================
                        ##### RS485 mode functions #####
 ===============================================================================
    [..] This subsection provides a set of functions allowing to manage the USART
         RS485 flow control.
    [..] RS485 flow control (Driver enable feature) handling is possible through
         the following procedure:
         (#) Program the Baud rate, Word length = 8 bits, Stop bits, Parity, 
             Transmitter/Receiver modes and hardware flow control values using 
             the USART_Init() function.
         (#) Enable the Driver Enable using the USART_DECmd() function.
         (#) Configures the Driver Enable polarity using the USART_DEPolarityConfig()
             function.
         (#) Configures the Driver Enable assertion time using USART_SetDEAssertionTime() 
             function and deassertion time using the USART_SetDEDeassertionTime()
             function.    
         (#) Enable the USART using the USART_Cmd() function.
      [..]  
       (@) The assertion and dessertion times are expressed in sample time units (1/8 or 
            1/16 bit time, depending on the oversampling rate).

Function Documentation

void USART_DECmd	(	USART_TypeDef *	USARTx,
		FunctionalState	NewState
	)

Enables or disables the USART's DE functionality.

Parameters

USARTx	Select the USART peripheral. This parameter can be one of the following values: USART1 or USART2 or USART3 or UART4 or UART5.
NewState	new state of the driver enable mode. This parameter can be: ENABLE or DISABLE.

Return values

None

Definition at line 1495 of file stm32f30x_usart.c.

void USART_DEPolarityConfig	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEPolarity
	)

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

Definition at line 1522 of file stm32f30x_usart.c.

void USART_SetDEAssertionTime	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEAssertionTime
	)

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

Definition at line 1540 of file stm32f30x_usart.c.

void USART_SetDEDeassertionTime	(	USART_TypeDef *	USARTx,
		uint32_t	USART_DEDeassertionTime
	)

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 de-activation of the DE signal

Return values

None

Definition at line 1560 of file stm32f30x_usart.c.