rtio: expose coarse timestamp in RTIO and DRTIO satellite cores

artiq/gateware/drtio/core.py

@@ -90,6 +90,7 @@ class DRTIOSatellite(Module):
                 coarse_ts.eq(coarse_ts + 1)
             )
         self.comb += self.rt_packet.cri.counter.eq(coarse_ts << fine_ts_width)
+        self.coarse_ts = coarse_ts
 
         self.submodules.outputs = ClockDomainsRenamer("rio")(
             SED(channels, fine_ts_width, "sync",

artiq/gateware/rtio/core.py

@@ -73,6 +73,7 @@ class Core(Module, AutoCSR):
             coarse_ts_cdc.i.eq(coarse_ts),
             self.cri.counter.eq(coarse_ts_cdc.o << glbl_fine_ts_width)
         ]
+        self.coarse_ts = coarse_ts
 
         # Outputs/Inputs
         quash_channels = [n for n, c in enumerate(channels) if isinstance(c, LogChannel)]