stm32f4xx_usart.c File Reference

This file provides firmware functions to manage the following functionalities of the Universal synchronous asynchronous receiver transmitter (USART):

• Initialization and Configuration
• Data transfers
• Multi-Processor Communication
• LIN mode
• Half-duplex mode
• Smartcard mode
• IrDA mode
• DMA transfers management
• Interrupts and flags management.

Go to the source code of this file.

Detailed Description

This file provides firmware functions to manage the following functionalities of the Universal synchronous asynchronous receiver transmitter (USART):

• Initialization and Configuration
• Data transfers
• Multi-Processor Communication
• LIN mode
• Half-duplex mode
• Smartcard mode
• IrDA mode
• DMA transfers management
• Interrupts and flags management.

Author:

MCD Application Team

Version:

V1.0.0

Date:

30-September-2011

  *      
  *          ===================================================================
  *                                 How to use this driver
  *          ===================================================================
  *          1. Enable peripheral clock using the follwoing functions
  *             RCC_APB2PeriphClockCmd(RCC_APB2Periph_USARTx, ENABLE) for USART1 and USART6 
  *             RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) for USART2, USART3, UART4 or UART5.
  *
  *          2.  According to the USART mode, enable the GPIO clocks using 
  *              RCC_AHB1PeriphClockCmd() 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
  *                 - Configure the desired pin in alternate function by:
  *                   GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
  *                 - Select the type, pull-up/pull-down and output speed via 
  *                   GPIO_PuPd, GPIO_OType and GPIO_Speed members
  *                 - Call GPIO_Init() function
  *        
  *          4. Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware 
  *             flow control and Mode(Receiver/Transmitter) using the USART_Init()
  *             function.
  *
  *          5. For synchronous mode, enable the clock and program the polarity,
  *             phase and last bit using the USART_ClockInit() function.
  *
  *          5. Enable the NVIC and the corresponding interrupt using the function 
  *             USART_ITConfig() if you need to use interrupt mode. 
  *
  *          6. When using the DMA mode 
  *                   - Configure the DMA using DMA_Init() function
  *                   - Active the needed channel Request using USART_DMACmd() function
  * 
  *          7. Enable the USART using the USART_Cmd() function.
  * 
  *          8. Enable the DMA using the DMA_Cmd() function, when using DMA mode. 
  *
  *          Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections
  *          for more details
  *          
  *          In order to reach higher communication baudrates, it is possible to
  *          enable the oversampling by 8 mode using the function USART_OverSampling8Cmd().
  *          This function should be called after enabling the USART clock (RCC_APBxPeriphClockCmd())
  *          and before calling the function USART_Init().
  *          
  *  

Attention:

THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

© COPYRIGHT 2011 STMicroelectronics

Definition in file stm32f4xx_usart.c.