diff --git a/firmware/ice40-riscv/icE1usb/misc.h b/firmware/ice40-riscv/icE1usb/misc.h
index 76d5a7d..b72793f 100644
--- a/firmware/ice40-riscv/icE1usb/misc.h
+++ b/firmware/ice40-riscv/icE1usb/misc.h
@@ -36,4 +36,9 @@
 
 uint16_t e1_tick_read(int port);
 
+bool time_elapsed(uint32_t ref, unsigned int tick);
+void delay(unsigned int ms);
+uint32_t time_pps_read(void);
+uint32_t time_now_read(void);
+
 void reboot(int fw);