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ST STM32F31xx User Manual

ST STM32F31xx
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Universal synchronous asynchronous receiver
transmitter (USART)
UM1581
542/584
DocID023800 Rev 1
23.2.11 Half-duplex mode function
This subsection provides a set of functions allowing to manage the USART Half-duplex
communication.
The USART can be configured to follow a single-wire half-duplex protocol where the TX
and RX lines are internally connected.
USART Half duplex communication is possible through the following procedure:
1. Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter or Mode
receiver and hardware flow control values using the USART_Init() function.
2. Configures the USART address using the USART_SetAddress() function.
3. Enable the half duplex mode using USART_HalfDuplexCmd() function.
4. Enable the USART using the USART_Cmd() function.
The RX pin is no longer used.
In Half-duplex mode the following bits must be kept cleared:
ï‚· LINEN and CLKEN bits in the USART_CR2 register.
ï‚· SCEN and IREN bits in the USART_CR3 register.
ï‚· USART_HalfDuplexCmd()
23.2.12 Smartcard mode functions
This subsection provides a set of functions allowing to manage the USART Smartcard
communication.
The Smartcard interface is designed to support asynchronous protocol Smartcards as
defined in the ISO 7816-3 standard. The USART can provide a clock to the smartcard
through the SCLK output. In smartcard mode, SCLK is not associated to the
communication but is simply derived from the internal peripheral input clock through a 5-bit
prescaler.
Smartcard communication is possible through the following procedure:
1. Configures the Smartcard Prsecaler using the USART_SetPrescaler() function.
2. Configures the Smartcard Guard Time using the USART_SetGuardTime() function.
3. Program the USART clock using the USART_ClockInit() function as following:
 USART Clock enabled.
 USART CPOL Low.
 USART CPHA on first edge.
 USART Last Bit Clock Enabled.
4. Program the Smartcard interface using the USART_Init() function as following:
 Word Length = 9 Bits.
 1.5 Stop Bit.
 Even parity.
 BaudRate = 12096 baud.

Table of Contents

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ST STM32F31xx Specifications

General IconGeneral
BrandST
ModelSTM32F31xx
CategoryMicrocontrollers
LanguageEnglish

Summary

How to Use and Customize the Library

Library Configuration Parameters

Details configuration parameters that customize the library for specific applications via define statements.

Peripheral Initialization and Configuration

Step-by-step guide on how to initialize and configure a peripheral, including clock enabling.

Running Your First Example

Guides on loading and executing template examples, covering prerequisites and tool-specific steps.

Developing Your First Application

Outlines the typical starting point and steps for developing an application from scratch.

Analog-to-digital converter (ADC) Firmware Driver

ADC Firmware Driver API Description

Lists and describes the various functions available in the ADC library for peripheral control.

Controller Area Network (bxCAN) Firmware Driver

CAN Firmware Driver API Description

Lists and describes the various functions available in the CAN library for peripheral control.

Comparators (COMP) Firmware Driver

COMP Firmware Driver API Description

Lists and describes the various functions available in the COMP library for peripheral control.

CRC Calculation Unit (CRC) Firmware Driver

CRC Firmware Driver API Description

Lists and describes the various functions for CRC configuration and computation.

Digital-to-Analog Converter (DAC) Firmware Driver

DAC Firmware Driver API Description

Lists and describes the various functions for DAC peripheral control and data transfer.

DMA Controller (DMA) Firmware Driver

DMA Firmware Driver API Description

Lists and describes functions for DMA initialization, configuration, and data transfers.

External Interrupt/Event Controller (EXTI) Firmware Driver

EXTI Firmware Driver API Description

Lists and describes functions for EXTI features, usage, initialization, and interrupt management.

FLASH Memory (FLASH) Firmware Driver

FLASH Firmware Driver API Description

Lists and describes functions for FLASH interface configuration and memory programming.

General-purpose I/Os (GPIO) Firmware Driver

GPIO Firmware Driver API Description

Lists and describes functions for GPIO usage, initialization, read/write, and alternate functions.

Inter-integrated Circuit Interface (I2C) Firmware Driver

I2C Firmware Driver API Description

Lists and describes functions for I2C usage, initialization, communication, SMBUS, and registers management.

Independent Watchdog (IWDG) Firmware Driver

IWDG Firmware Driver API Description

Lists and describes functions for IWDG features, usage, prescaler, activation, and flag management.

Operational Amplifier (OPAMP) Firmware Driver

OPAMP Firmware Driver API Description

Lists and describes functions for OPAMP peripheral features, usage, and initialization.

Power Control (PWR) Firmware Driver

PWR Firmware Driver API Description

Lists and describes functions for backup domain access, PVD configuration, and low power modes.

Reset and Clock Control (RCC) Firmware Driver

RCC Firmware Driver API Description

Lists and describes functions for RCC features, clock configuration, and peripheral clocks.

Real-time Clock (RTC) Firmware Driver

RTC Firmware Driver API Description

Lists and describes functions for RTC operating conditions, domain access, and time/date configuration.

Serial Peripheral Interface (SPI) Firmware Driver

SPI Firmware Driver API Description

Lists and describes functions for SPI usage, initialization, data transfers, CRC calculation, and DMA.

System Configuration Controller (SYSCFG) Firmware Driver

SYSCFG Firmware Driver API Description

Lists and describes functions for SYSCFG usage, initialization, and configuration.

General-Purpose Timers (TIM) Firmware Driver

TIM Firmware Driver API Description

Lists and describes functions for TIM output compare, input capture, advanced control, and synchronization management.

Universal Synchronous Asynchronous Receiver Transmitter (USART) Firmware Driver

USART Firmware Driver API Description

Lists and describes functions for USART usage, initialization, RS485, DMA, interrupts, STOP mode, and AutoBaudRate.

Window Watchdog (WWDG) Firmware Driver

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