1 Description

The DMA Ping Pong with ADC example demonstrates how to use the DMA to transfer ADC data between two different buffers, also known as a DMA Ping Pong. A DMA Ping Pong is commonly used to transfer data to one buffer while the CPU is working with the other buffer. The blue path in Figure 1-1 shows that the DMA transfers data to Buffer 1 and the CPU gets data from Buffer 2. When the paths switch, the DMA transfers data to Buffer 2 and the CPU gets data from Buffer 1. The benefit to this technique is faster total application runtime because the CPU is free to operate on a section of data at all times. In this example, the ADC is configured in single conversion mode and the DMA and CPU switches between buffers after each conversion.

Figure 1-1 Subsystem Functional Block Diagram