I am trying to use a DMA in circular mode to transfer data from an ADC to an array that will hold the data. I need to concurrently use the incoming data (in this case, I am using AT commands to send the data over Wi-Fi with the esp8266 module)
I am wondering what the software flow would look like.
Here are some questions:
How will the DMAC know when to wrap around when it reaches the end of the array? -- i.e. how can I ensure that the DMA won't transfer data past the last array index? (Is this size limit defined by the DMA_BufferSize?)
Because I want to concurrently use the collected data, I am thinking of using 3 arrays to store the data. I would read & erase the data out of one array whilst the others are being filled by the DMA, and it would cycle around. Is it smart and/or possible to change the DMA destination constantly like this?