6.7. DMA circularly receives uart data example、¶
6.7.1. Overview¶
This example project shows the DMA circularly transfer mode realized by chain transfer.
The ChnLLPointer of the two chain descriptors point to each other, A point to B, and B point to A. After A transfer completed, B will be transfered, and after B transfer completed, A will be transfered, thus realizing circularly transfer without software intervention.
6.7.2. Board Setting¶
Use the serial port debugging assistant to send and receive data
The serial port is set to
115200bps
,1 stop bit
,no parity bit
6.7.3. Running the example¶
Use the serial port debugging assistant to send data, and the development board will send back the received data, as shown in the following example
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