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UM1581

Universal synchronous asynchronous receiver

transmitter (USART)

DocID023800 Rev 1

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 Specifies wether the hardware flow control mode is enabled or disabled. This

parameter can be a value of USART_Hardware_Flow_Control

23.1.3 USART_ClockInitTypeDef

USART_ClockInitTypeDef is defined in the stm32f30x_usart.h

Data Fields

 uint32_t USART_Clock

 uint32_t USART_CPOL

 uint32_t USART_CPHA

 uint32_t USART_LastBit

Field Documentation

 uint32_t USART_ClockInitTypeDef::USART_Clock

 Specifies whether the USART clock is enabled or disabled. This parameter can

be a value of USART_Clock

 uint32_t USART_ClockInitTypeDef::USART_CPOL

 Specifies the steady state of the serial clock. This parameter can be a value of

USART_Clock_Polarity

 uint32_t USART_ClockInitTypeDef::USART_CPHA

 Specifies the clock transition on which the bit capture is made. This parameter

can be a value of USART_Clock_Phase

 uint32_t USART_ClockInitTypeDef::USART_LastBit

 Specifies whether the clock pulse corresponding to the last transmitted data bit

(MSB) has to be output on the SCLK pin in synchronous mode. This parameter

can be a value of USART_Last_Bit

23.2 USART Firmware driver API description

The following section lists the various functions of the USART library.

23.2.1 How to use this driver

1. Enable peripheral clock using

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) function for

USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx,

ENABLE) function for USART2, USART3, UART4 and UART5.

2. According to the USART mode, enable the GPIO clocks using

RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS, or and SCLK).

3. Peripheral's alternate function:

 Connect the pin to the desired peripherals' Alternate Function (AF) using

GPIO_PinAFConfig() function.

ST STM32F31xx User Manual

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