Source code for artiq.coredevice.grabber

from numpy import int32, int64

from artiq.language.core import *
from artiq.language.types import *
from artiq.coredevice.rtio import rtio_output, rtio_input_data

[docs]class OutOfSyncException(Exception): """Raised when an incorrect number of ROI engine outputs has been retrieved from the RTIO input FIFO.""" pass
[docs]class Grabber: """Driver for the Grabber camera interface.""" kernel_invariants = {"core", "channel_base", "sentinel"} def __init__(self, dmgr, channel_base, res_width=12, count_shift=0, core_device="core"): self.core = dmgr.get(core_device) self.channel_base = channel_base count_width = min(31, 2*res_width + 16 - count_shift) # This value is inserted by the gateware to mark the start of a series of # ROI engine outputs for one video frame. self.sentinel = int32(2**count_width) @kernel
[docs] def setup_roi(self, n, x0, y0, x1, y1): """ Defines the coordinates of a ROI. The coordinates are set around the current position of the RTIO time cursor. The user must keep the ROI engine disabled for the duration of more than one video frame after calling this function, as the output generated for that video frame is undefined. Advances the timeline by 4 coarse RTIO cycles. """ c = int64(self.core.ref_multiplier) rtio_output(now_mu(), self.channel_base, 4*n+0, x0) delay_mu(c) rtio_output(now_mu(), self.channel_base, 4*n+1, y0) delay_mu(c) rtio_output(now_mu(), self.channel_base, 4*n+2, x1) delay_mu(c) rtio_output(now_mu(), self.channel_base, 4*n+3, y1) delay_mu(c)
[docs] def gate_roi(self, mask): """ Defines which ROI engines produce input events. At the end of each video frame, the output from each ROI engine that has been enabled by the mask is enqueued into the RTIO input FIFO. This function sets the mask at the current position of the RTIO time cursor. Setting the mask using this function is atomic; in other words, if the system is in the middle of processing a frame and the mask is changed, the processing will complete using the value of the mask that it started with. :param mask: bitmask enabling or disabling each ROI engine. """ rtio_output(now_mu(), self.channel_base+1, 0, mask)
[docs] def gate_roi_pulse(self, mask, dt): """Sets a temporary mask for the specified duration (in seconds), before disabling all ROI engines.""" self.gate_roi(mask) delay(dt) self.gate_roi(0)
[docs] def input_mu(self, data): """ Retrieves the accumulated values for one frame from the ROI engines. Blocks until values are available. The input list must be a list of integers of the same length as there are enabled ROI engines. This method replaces the elements of the input list with the outputs of the enabled ROI engines, sorted by number. If the number of elements in the list does not match the number of ROI engines that produced output, an exception will be raised during this call or the next. """ channel = self.channel_base + 1 sentinel = rtio_input_data(channel) if sentinel != self.sentinel: raise OutOfSyncException for i in range(len(data)): roi_output = rtio_input_data(channel) if roi_output == self.sentinel: raise OutOfSyncException data[i] = roi_output