VCS PLI: vpi_put_value not working

[Yottameter]

In my VPI code I have the following, in which I am trying to force
single bit ports to a 1:

s_vpi_value value_s;
value_s.format=vpiBinStrVal;
char myValue[2]="1";
value_s.value.str=myValue;
vpi_put_value(port_handle, &value_s, NULL, vpiForceFlag);

inside the loop of a module iterating over all the inputs of the module,
so port_handle contains an input port.

I know the following:
1. port_handle exists, I am able to print out the port name, and the
value of the port.
2. vpiForceFlag, vpiNoDelay, etc, do not work. I see the original values
and not the value I have forced, ie a '1'.
3. I'm using vcs, and I tried setting the cli to +cli+3, which didn't do
anything.
4. At the same time I call the PLI function that is supposed to force
the ports, I tried to force it via the verilog, this works.

It's coming down to the vpi_put_value just not 'put'ting the value. What
am I doing wrong here? I've tried integer assigns and scalar assigns as
well.

Joe

 

[mmintz@gmail.com]

Hi Joe,

What simulation time are you setting for the delay? Here is the
innards of the teal code that does the same thing:

s_vpi_value v;
v.format = vpiVectorVal;
v.value.vector = (s_vpi_vecval*)teal_acc_vecval_;
s_vpi_time delay;
delay.type = vpiSimTime;
delay.low = 0;
delay.high = 0;
vpi_put_value (handle_, &v, &delay, write_policy_);
s_vpi_error_info error_data;
if (vpi_chk_error (&error_data)) {
local_log << teal_error << "Error in vpi_put_value: " <<
error_data.message << endm;
local_log << teal_error << "Error in vpi_put_value: at " <<
error_data.file << " " << error_data.line << endm;
}

I do not use string, but perhaps the format is wrong? Maybe it's
expecting a 1'b1 ?

Hope this helps.

Take Care,
Mike

On Aug 17, 5:25 pm, Yottameter <yottame...@yahoo.com> wrote:

In my VPI code I have the following, in which I am trying to force
single bit ports to a 1:

s_vpi_value value_s;
value_s.format=vpiBinStrVal;
char myValue[2]="1";
value_s.value.str=myValue;
vpi_put_value(port_handle, &value_s, NULL, vpiForceFlag);

inside the loop of a module iterating over all the inputs of the module,
so port_handle contains an input port.

I know the following:
1. port_handle exists, I am able to print out the port name, and the
value of the port.
2. vpiForceFlag, vpiNoDelay, etc, do not work. I see the original values
and not the value I have forced, ie a '1'.
3. I'm using vcs, and I tried setting the cli to +cli+3, which didn't do
anything.
4. At the same time I call the PLI function that is supposed to force
the ports, I tried to force it via the verilog, this works.

It's coming down to the vpi_put_value just not 'put'ting the value. What
am I doing wrong here? I've tried integer assigns and scalar assigns as
well.

Joe

 

[Yottameter]

Thanks for the suggestion, but the problem was that I didn't set up an
acc tab file correctly. I created a tab file that listed:

$myFunction data=0 acc+=read_write:* acc+=force:*

which worked.

Is there a better way to do this?




mmintz@gmail.com wrote:

Hi Joe,

What simulation time are you setting for the delay? Here is the
innards of the teal code that does the same thing:

s_vpi_value v;
v.format = vpiVectorVal;
v.value.vector = (s_vpi_vecval*)teal_acc_vecval_;
s_vpi_time delay;
delay.type = vpiSimTime;
delay.low = 0;
delay.high = 0;
vpi_put_value (handle_, &v, &delay, write_policy_);
s_vpi_error_info error_data;
if (vpi_chk_error (&error_data)) {
local_log << teal_error << "Error in vpi_put_value: "
error_data.message << endm;
local_log << teal_error << "Error in vpi_put_value: at "
error_data.file << " " << error_data.line << endm;
}

I do not use string, but perhaps the format is wrong? Maybe it's
expecting a 1'b1 ?

Hope this helps.

Take Care,
Mike

On Aug 17, 5:25 pm, Yottameter <yottame...@yahoo.com> wrote:

In my VPI code I have the following, in which I am trying to force
single bit ports to a 1:

s_vpi_value value_s;
value_s.format=vpiBinStrVal;
char myValue[2]="1";
value_s.value.str=myValue;
vpi_put_value(port_handle, &value_s, NULL, vpiForceFlag);

inside the loop of a module iterating over all the inputs of the module,
so port_handle contains an input port.

I know the following:
1. port_handle exists, I am able to print out the port name, and the
value of the port.
2. vpiForceFlag, vpiNoDelay, etc, do not work. I see the original values
and not the value I have forced, ie a '1'.
3. I'm using vcs, and I tried setting the cli to +cli+3, which didn't do
anything.
4. At the same time I call the PLI function that is supposed to force
the ports, I tried to force it via the verilog, this works.

It's coming down to the vpi_put_value just not 'put'ting the value. What
am I doing wrong here? I've tried integer assigns and scalar assigns as
well.

Joe