diff --git a/tests/regression/misc/Makefile.am b/tests/regression/misc/Makefile.am index df99688cc..90f1940b1 100644 --- a/tests/regression/misc/Makefile.am +++ b/tests/regression/misc/Makefile.am @@ -1,7 +1,7 @@ ## Process this file with automake to produce Makefile.in -TESTS = bugs-1.cir dollar-1.cir empty-1.cir resume-1.cir log-functions-1.cir +TESTS = bugs-1.cir dollar-1.cir empty-1.cir resume-1.cir resume-2.cir log-functions-1.cir TESTS_ENVIRONMENT = ngspice_vpath=$(srcdir) $(SHELL) $(top_srcdir)/tests/bin/check.sh $(top_builddir)/src/ngspice diff --git a/tests/regression/misc/resume-2.cir b/tests/regression/misc/resume-2.cir new file mode 100644 index 000000000..084a61365 --- /dev/null +++ b/tests/regression/misc/resume-2.cir @@ -0,0 +1,50 @@ +regression test for "alter" with "stop" and "resume" + +* (exec-spice "ngspice %s" t) + +* check wheter we can "stop" a transient simulation +* alter a resistance and a voltage +* and successfully "resume" from there +* +* charge a capacitor for 1ms +* (first order e^(-t/tau) response, with tau=1ms) +* then stop, alter resistance, and voltage, +* for a new tau of just 100us +* and resume from there. +* +* finally, compare the capacitor voltage against a golden trace + +v1 1 0 dc 5 + +r1 1 2 1k +c2 2 0 1u + +.control +stop when time = 1ms +tran 2u 2ms uic +alter r1=100 +alter v1=10 +resume + +* calculate the golden response +let tau1 = 1k * 1u +let tau2 = 100 * 1u +let tstop = 1ms +let vstop = 5 * (1 - exp(-tstop / tau1)) +let trace1 = 5 * (1 - exp(-time / tau1)) +let trace2 = vstop + (10 - vstop) * (1 - exp(-(time - tstop) / tau2)) +let gold = (time le tstop) * trace1 + (time gt tstop) * trace2 + +* plot v(2) gold + +let maxerr = vecmax(abs(v(2) - gold)) + +if maxerr > 2e-4 + echo "ERROR: test failed, excessive error, maxerr = $&maxerr" + quit 1 +else + echo "INFO: success" + quit 0 +end + +.endc diff --git a/tests/regression/misc/resume-2.out b/tests/regression/misc/resume-2.out new file mode 100644 index 000000000..62b25a637 --- /dev/null +++ b/tests/regression/misc/resume-2.out @@ -0,0 +1,8 @@ +Initial Transient Solution + +Node Voltage +1 0 +2 0 +v1#branch 0 + +INFO: success