Re: Delta Tau issue

[Andy Foster via Tech-talk <tech-talk at aps.anl.gov>]

Hi Mark,

My understanding of this is that a checksum error has occurred in downloading a program such as a PLC or motion program to the PMAC user buffer space. I think it can also be caused by a download of the firmware, but since you don't do that very often, if ever, unlikely to be that.

In my experience, it needs a power cycle of the logic power to clear that bit.

Cheers, Andy

On Mon, 25 Jul 2022, 21:25 Mark Rivers via Tech-talk, <tech-talk at aps.anl.gov> wrote:

Folks,

 

I have a Delta Tau GeoBrick 8-channel system.  I have been using it with the Model 2 driver (not based on asynMotorDriver) in the tpmac repository: https://github.com/epics-modules/tpmacc.  I had not seen any errors with that driver.

 

I have just updated it to use the Model 3 driver (based on asynMotorDriver) in the pmac repository: https://github.com/dls-controls/pmac

 

The motors seem to be driving OK.  However, the OPI screens show a Controller Error, and the poller prints this message:

 

2022/07/25 15:10:09.937 pmacController::fastUpdate *** Hardware Problem *** global status [???] => 8400913

 

The controller error is generated if this _expression_ is non-zero:

const epicsUInt32 pmacController::PMAC_HARDWARE_PROB = (PMAC_GSTATUS_REALTIME_INTR |

                                                        PMAC_GSTATUS_FLASH_ERROR |

                                                        PMAC_GSTATUS_DPRAM_ERROR |

                                                        PMAC_GSTATUS_CKSUM_ERROR |

                                                        PMAC_GSTATUS_WATCHDOG |

                                                        PMAC_GSTATUS_SERVO_ERROR);

 

 

That Global Status value 8400913 in hex is 0x803011.  This translates to the following status bits being set:

 

Bit	Symbolic constant	Problem bit in PMAC_HARDWARE_PROB?
0x1	PMAC_GSTATUS_CARD_ADDR	No
0x10	PMAC_GSTATUS_MACRO_RING_ERRORCHECK	No
0x1000	PMAC_GSTATUS_CKSUM_ACTIVE	No
0x2000	PMAC_GSTATUS_CKSUM_ERROR	Yes
0x800000	PMAC_GSTATUS_RESERVED3	No

 

So it appears that the Controller Error on the OPI screen and the error message being printed is because the PMAC_GSTATUS_CKSUM_ERROR bit is set.

 

Does anyone know what that bit means, and why it might be set?

 

Thanks,

Mark