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COMMENT
ipulse2.mod
Generates a train of current pulses
User specifies dur (pulse duration), per (period, i.e. interval between pulse onsets),
and number of pulses.
Ensures that period is longer than pulse duration.
2/6/2002 NTC
ENDCOMMENT
NEURON {
POINT_PROCESS Ipulse2
RANGE del, dur, per, num, amp, i
ELECTRODE_CURRENT i
}
UNITS {
(nA) = (nanoamp)
}
PARAMETER {
del (ms)
dur (ms) <0, 1e9> : duration of ON phase
per (ms) <0, 1e9> : period of stimuls, i.e. interval between pulse onsets
num : how many to deliver
amp (nA) : how big
}
ASSIGNED {
ival (nA)
i (nA)
on
tally : how many more to deliver
}
INITIAL {
if (dur >= per) {
per = dur + 1 (ms)
printf("per must be longer than dur\n")
UNITSOFF
printf("per has been increased to %g ms\n", per)
UNITSON
}
on = 0
i = 0
ival = 0
tally = num
if (tally > 0) {
net_send(del, 1)
tally = tally - 1
}
}
BREAKPOINT {
i = ival
}
NET_RECEIVE (w) {
: ignore any but self-events with flag == 1
if (flag == 1) {
if (on == 0) {
: turn it on
ival = amp
on = 1
: prepare to turn it off
net_send(dur, 1)
} else {
: turn it off
ival = 0
on = 0
if (tally > 0) {
: prepare to turn it on again
net_send(per - dur, 1)
tally = tally - 1
}
}
}
}
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