Don't check the timer interrupt periodically when waiting if it's not even enabled

1 files changed, 2 insertions, 0 deletions

diff --git a/rvcontroller.lua b/rvcontroller.lua
index e6e86e5..f3a85d2 100644
--- a/rvcontroller.lua
+++ b/rvcontroller.lua
@@ -3399,6 +3399,8 @@ elseif event.iid == "checkinterrupt" and mem.interruptwaiting then
 		digiline_send("monitordisp","CPU started")
 		interrupt(1/CLOCK_SPEED,"tick")
 	else
+		local miebits = explodebits(mem.csr[0x304],32)
+		if not miebits[7] then return end -- No need to keep checking the timer if it's not even on
 		interrupt(1,"checkinterrupt",mem.csr[0x800]%2 == 1)
 	end
 end