Error: cf is not a member of StringContext

[Varun Gandhi]

Hi,

I'm trying to print a Vec object and replicate the code as described in this post:

https://www.chisel-lang.org/chisel3/docs/explanations/printing.html#scala-style

val myVec = VecInit(5.U, 10.U, 13.U) 

printf(cf"myVec = $myVec")

But I'm getting the following error: 

/home/centos/chipyard/generators/rocket-chip/src/main/scala/tilelink/Arbiter.scala:118:14: value cf is not a member of StringContext
[error]       printf(cf"myVec = $myVec")
[error]              ^

I would appreciate some pointers on this. 

Thanks,

Varun

[Jack Koenig]

Hello,

What version of Chisel are you using? cf"..." was released as part of Chisel 3.5.4 (the most recent release of Chisel). See the release notes: https://github.com/chipsalliance/chisel3/releases/tag/v3.5.4

~Jack

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[Varun Gandhi]

Hi Jack,

I’m using chipyard. According to this link: https://github.com/ucb-bar/chipyard/pull/1216 — It appears that the chisel version I’m using is 3.5.2. What approach can I follow to generate printfs in 3.5.2?

Best,

Varun

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[Edward Wang]

Hi Varun,

You can use something along the lines of: printf("out is %d\n", io.out)

This should be valid in older versions of Chisel too.

https://stackoverflow.com/a/53484936

Thanks,
Edward

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[Varun Gandhi]

Thanks, Edward. I guess my question was specific to printing aggregate datatypes. If I understand this correctly — there are no scala-style printfs in chisel versions < 3.5.4?

Best,
Varun

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[Edward Wang]

I don't believe so - you could always write your own function for an
aggregate datatype which calls the standard printf()?

Thanks,
Edward

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[Jack Koenig]

You can use p"..." which still exists in Chisel 3.5.4 but existed in earlier versions as well. The main difference is that `cf"..."` also supports format specifiers (which p"...") does not.

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