Software description

AN4457

12/24

DocID026046 Rev 1

2.2

Transmission

2.2.1

Frame transmission

Figure 5 describes the implementation of the function that sends a give number of bytes

using DMA and timer.

TxXferCount is a counter that is incremented after the completion each DMA transfer.

FirstBuffer_Tx and SecondBuffer_Tx: the DMA source address switches between two

buffers addresses. The first buffer is used by DMA as source data, while the second buffer is

used by the CPU to format data.

Figure 5. Frame transmission routine flowchart