GIODINA Inputs Only Read With Emulator (SD XDS510) Connected

Jeremy Warmbier

I am seeing a difference in the ability to read the state of a GIO digital input when the TMS570LS20216ASPGE is running with an emulator connected and when the part is running with the emulator in the disconnected state. When the emulator is connected, the value of the port is correctly reported in the GIODINA register (i.e. I can see the bit corresponding to GIOA[5] change states 0 to 1 when I change the pin input value). However when the emulator is disconnected, the bit for GIOA[5] is always reported as 0.

MEASUREMENT SETUP:

In all cases, I am using XCP protocol over FlexRay to monitor the values of the registers.

GIODIRA = 0001 1011

GIODOUTA = 0001 0000

GIOEMUA = 0000 0000

GIODRA = 1000 0000

GIOPSLA = 0000 0000

GIOPULDISA = 1110 0000

PWRDWNSET1 = 0

PWRDWNSET2 = 0000 0000 0001 0000

PWRDWNSET3 = 0

How is the emulator impacting my ability to read a DIO pin?

over 15 years ago

0 Jeremy Warmbier over 15 years ago

Prodigy 130 points

§12.3.2.5 of spnu489 has table12-1 that shows for when a pin is configured as a digital input via GIODIR, and has a coresponding GIOPULDIS of 1, and a GIOPSL of 0 then the input buffer is disabled. This is the cause of the inability to read the input pin state. However, I am not sure what mechanism the debugger is using to override the input buffere disabled state to all the pin to be read.

0 Anthony F. Seely over 9 years ago in reply to Jeremy Warmbier

TI__Guru 68920 points

Thank you for posting this solution Jeremy

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GIODINA Inputs Only Read With Emulator (SD XDS510) Connected