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Tips and tricks with DMA on MPC56xx

Posted: 06 Jul 2010 ?? ?Print Version ?Bookmark and Share

Keywords:DMA tips tricks? MPC56xx MPC55xx? serial data?

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 the SCI transmitter, SCI receiver, SPI master and 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.

View the PDF document for more information.

Click here to view related datasheets.

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