Tips and Tricks with DMA on MPC56xx

PublishTime：2021-08-19

Introduction:
●This application note presents a set of simple examples using eDMA on MPC56xx and MPC55xx to emulate receiving and transmitting serial data over SPI and SCI. This additionally demonstrates advanced features of eDMA on these examples together with some other techniques to minimize CPU load and perform certain nontrivial tasks, such as SCI/SPI communication using eDMA and other peripherals. This does not include any software task.
●In this process seven sample applications were prepared for MPC5607B, employing various DMA channels to emulate
■SCI transmitter
■SCI receiver
■SPI master
■SPI slave
●All these examples emulate simple serial communications and thus share one technique to serialize/de-serialize data bits using unused or unusable GPIO pins. More specifically SIUL (System Integration Unit Lite) registers for serial and parallel access.
●Other techniques or eDMA features, which are used in these sample applications, include:
■Channel to channel linking
■Scatter-gather feature
■Conditional linking using eMIOS
●All these examples are compilable using standard development tools, listed below with the versions used for the testing. A simple Makefile is used to build executable for the following three compilers.
■GreenHills version 5.16
■WindRiver version 5.6.1
■CodeWarrior version 2.3

Brand of Product：	NXP
Part#：	MPC56xx 、 MPC55xx 、 MPC5607B More Part#
Product Category：	More
Application：	More
Data Type：	Application note & Design Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	07/2010
Version Number：	Rev. 0
Data Encoding：	AN4147
Data Size：	234 KB

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