Issue with data transmission: DacDacScan

[simonspa]

Dear all,

I noticed some problems in data transmission in DacDac scans which come earlier than the known 254x254 limit.

Wen running e.g. a VthrComp vs CalDel scan with DacMax = 130 for both the HAL reports the following:

[17:21:39.316] DEBUGHAL: <PixelCalibrateDacDacScan:L665> Scanning field DAC 26 0-130, DAC 12 0-130
[17:21:39.316] DEBUGRPC: <roc_I2cAddr:L1049>  called.
[17:21:39.316] DEBUGRPC: <CalibrateDacDacScan:L1500>  called.
[17:21:39.316] DEBUGRPC: <GetRpcCallId:L130>  called.
[17:21:41.728] DEBUGHAL: <PixelCalibrateDacDacScan:L679> Function returns: 1
[17:21:41.728] DEBUGHAL: <PixelCalibrateDacDacScan:L680> Data size: nReadouts 16900, PHsum 516

so the size of the return vector nReadouts is correct: 130x130 but PHsum is significantly shorter. This does not happen up to a phase space size of 120x120:

[17:25:43.625] DEBUGHAL: <PixelCalibrateDacDacScan:L665> Scanning field DAC 26 0-120, DAC 12 0-120
[17:25:43.625] DEBUGRPC: <roc_I2cAddr:L1049>  called.
[17:25:43.625] DEBUGRPC: <CalibrateDacDacScan:L1500>  called.
[17:25:43.625] DEBUGRPC: <GetRpcCallId:L130>  called.
[17:25:45.665] DEBUGHAL: <PixelCalibrateDacDacScan:L679> Function returns: 1
[17:25:45.665] DEBUGHAL: <PixelCalibrateDacDacScan:L680> Data size: nReadouts 14400, PHsum 14400

Suspicion here is some limit on the total data size, since nReadouts is only of type int16_t and transmitted correctly while PHsum is int32_t.

Beside that I don't get any values here, but that might again be my stupidity?

[simonspa]

Since we are not transferring any decoded data via vectors anymore but rather do a full DAQ this ticket is obsolete.