UART Sessions

NSDSP-1 and NSDSP-2 have dedicated UART pin, however UART communications cannot be performed in parallel with other tasks. They require a dedicated UART session.

To start UART communications you need to do the following:

• Create an NSDSP Object
• Set flow control and baud rate
• Start UART session

When the UART communications are finished, you need to end the session and free NSDSP. When you end the session, the library will automatically wait for the completion of all the pending UART communications.

The following pseudo-code shows the required procedure

  NSDSP.create(serial)
  NSDSP.rate = 115200
  NSDSP.flowControl = false
  Session = NSDSP.startUARTSession

  // Communications here

  NSDSP.endSession
  NSDSP.free

The baud rate must be specified exactly and must be one of the pre-defined values listed here.

Data is transferred to NSDSP in packets. Therefore sending single bytes or short messages is inefficient. Consequently, try to avoid protocols that use short messages and depend on the responses to continue.

Reception is independent of the transmission. You do not have any control on how much data is going to be received - this depends on the UART transmitter at the other end. To prevent data loss you need to read the received data. The library input buffer can hold approximately 250k characters. If more data is received before you get a chance to read it, some data will be lost.