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ST STM32F31xx User Manual

ST STM32F31xx
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UM1581
Serial peripheral interface (SPI)
DocID023800 Rev 1
409/584
SCK slave input clock as soon as CRCEN is set, and this, whatever the
value of the SPE bit.
ï‚· With high bitrate frequencies, be careful when transmitting the CRC. As the
number of used CPU cycles has to be as low as possible in the CRC transfer
phase, it is forbidden to call software functions in the CRC transmission
sequence to avoid errors in the last data and CRC reception. In fact,
CRCNEXT bit has to be written before the end of the transmission/reception
of the last data.
ï‚· For high bit rate frequencies, it is advised to use the DMA mode to avoid the
degradation of the SPI speed performance due to CPU accesses impacting
the SPI bandwidth.
ï‚· When the STM32F30x are configured as slaves and the NSS hardware
mode is used, the NSS pin needs to be kept low between the data phase and
the CRC phase.
ï‚· When the SPI is configured in slave mode with the CRC feature enabled,
CRC calculation takes place even if a high level is applied on the NSS pin.
This may happen for example in case of a multislave environment where the
communication master addresses slaves alternately.
ï‚· Between a slave deselection (high level on NSS) and a new slave selection
(low level on NSS), the CRC value should be cleared on both master and
slave sides in order to resynchronize the master and slave for their
respective CRC calculation.
To clear the CRC, follow the procedure below:
1. Disable SPI using the SPI_Cmd() function.
2. Disable the CRC calculation using the SPI_CalculateCRC() function.
3. Enable the CRC calculation using the SPI_CalculateCRC() function.
4. Enable SPI using the SPI_Cmd() function.
ï‚· SPI_CRCLengthConfig()
ï‚· SPI_CalculateCRC()
ï‚· SPI_TransmitCRC()
ï‚· SPI_GetCRC()
ï‚· SPI_GetCRCPolynomial()
20.2.5 DMA transfers management functions
ï‚· SPI_I2S_DMACmd()
ï‚· SPI_LastDMATransferCmd()
20.2.6 Interrupts and flags management functions
This section provides a set of functions allowing to configure the SPI/I2S Interrupts
sources and check or clear the flags or pending bits status. The user should identify which
mode will be used in his application to manage the communication: Polling mode, Interrupt
mode or DMA mode.
Polling Mode
In Polling Mode, the SPI/I2S communication can be managed by 9 flags:

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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