The common ATCA driver is responsible for the following:

• Connect to CPSW driver and establish communication with the registers of the firmware common structure and are
  • DaqMux 0 and 1 configurations
  • JESD Top (AMC) 0 and 1
  • Waveform engine
  • Build information
  • Temperature information
  • timing cross bar
• Provide API class, once instantiated using static function, the user is permitted to control the registers and create and read streams

ATCACommon API class

This class is responsible for DaqMux 0 and 1 configurations, JESD Top (AMC) 0 and 1, Waveform engine, Build information, and temperature information.

API Instantiation

The static function if the parent class ATCACommonFw allows the instantiation of API class. It seems to return an instantiation of the child class as follows:

ATCACommonFw IATCACommonFw::create(Path p)
{
    return IEntryAdapt::check_interface<ATCACommonFwAdapt, DevImpl>(p);
}

The code to instantiate the API is as follows

atcaCommon = IATCACommonFw::create(p_atcaCommon);

Stream instantiation

The stream can be created using the createStream method in the API. Streams can be instantiated separately by calling the CPSW stream creation function directly as follows

    try {
        _stream[0] = IStream::create(p_root->findByName(stream0));
    } 
    catch (InvalidArgError &e) {
        // Don't print error if the stream name is empty, as the user didn't
        // want to create this channel anyway.
    }
    catch (CPSWError &e) {
        fprintf(stderr, "CPSW Error: %s, file: %s, line: %d\n", e.getInfo().c_str(), __FILE__, __LINE__);
    }

CrossbarControlYaml API class

This class is responsible for configuring the timing cross bar. The timing cross bar is nothing more than four multiplexers configuring four outputs choosing from four sources

1. NC TPG timing
2. Mini TPG
3. Back plane
4. SC TPG timing

The UML diagram is shown as follows.

The functions available are simply to instantiate a crossbar, and to configure and read current configuration. 

Exception handling

CPSW throws CPSWError errors, but the driver does not. It does propagate however the exception CPSWError in some contexts and performs some prints to stderr. Upper layers should catch exceptions of type CPSWError.