TM_USART_DMA

DMA TX functionality for TM USART library - http://stm32f4-discovery.com/2015/04/library-55-extend-usart-with-tx-dma. More...

Modules
	TM_USART_DMA_Macros
	Library defines.
	TM_USART_DMA_Typedefs
	Library Typedefs.
	TM_USART_DMA_Functions
	Library Functions.

Detailed Description

DMA TX functionality for TM USART library - http://stm32f4-discovery.com/2015/04/library-55-extend-usart-with-tx-dma.

This library allows you to send data over USART with DMA feature.

It is great feature because you can do other stuff while DMA sends data to USART.

It is designed only for TX data from MCU to other world. For RX, TM_USART library already uses RXNE (RX Not Empty) interrupts when data is available and there is no need for RX DMA too right now.

Default stream and channel settings

Library uses default settings for DMA TX Stream and Channel settings. But it may happen that your USART DMA is on the same stream and DMA as something other you need. You are able to use custom Stream and Channel using TM_USART_DMA_InitWithStreamAndChannel() function.

Note

All possible DMA Streams and Channels for USART TX DMA can be found in STM32F4xx Reference manual.

Default DMA streams and channels:

USARTx     | DMA  | DMA Stream   | DMA Channel

USART1     | DMA2 | DMA Stream 7 | DMA Channel 4
USART2     | DMA1 | DMA Stream 6 | DMA Channel 4
USART3     | DMA1 | DMA Stream 3 | DMA Channel 4
UART4      | DMA1 | DMA Stream 4 | DMA Channel 4
UART5      | DMA1 | DMA Stream 7 | DMA Channel 4
USART6     | DMA2 | DMA Stream 6 | DMA Channel 5
UART7      | DMA1 | DMA Stream 1 | DMA Channel 5
UART8      | DMA1 | DMA Stream 0 | DMA Channel 5

Changelog

 Version 1.2.1
  - Added separate function for enabling/disabling USART DMA interrupts
  
 Version 1.2
  - June 13, 2015
  - Added support for DMA interrupts for USART
  
 Version 1.1
  - June 06, 2015
  - Added TM DMA library support for future purpose
  
 Version 1.0
  - First release

Dependencies

 - STM32F4xx
 - STM32F4xx DMA
 - defines.h
 - TM USART
 - TM DMA
 - string.h