diff --git a/artiq/runtime/ttl.c b/artiq/runtime/ttl.c
index db75207d4..bdd6d82b3 100644
--- a/artiq/runtime/ttl.c
+++ b/artiq/runtime/ttl.c
@@ -6,53 +6,24 @@
 
 void ttl_set_o(long long int timestamp, int channel, int value)
 {
-    rtio_chan_sel_write(channel);
-    rtio_o_timestamp_write(timestamp);
-    rtio_o_address_write(0);
-    rtio_o_data_write(value);
-    rtio_write_and_process_status(timestamp, channel);
+    rtio_output(timestamp, channel, 0, value);
 }
 
 void ttl_set_oe(long long int timestamp, int channel, int oe)
 {
-    rtio_chan_sel_write(channel);
-    rtio_o_timestamp_write(timestamp);
-    rtio_o_address_write(1);
-    rtio_o_data_write(oe);
-    rtio_write_and_process_status(timestamp, channel);
+    rtio_output(timestamp, channel, 1, oe);
 }
 
 void ttl_set_sensitivity(long long int timestamp, int channel, int sensitivity)
 {
-    rtio_chan_sel_write(channel);
-    rtio_o_timestamp_write(timestamp);
-    rtio_o_address_write(2);
-    rtio_o_data_write(sensitivity);
-    rtio_write_and_process_status(timestamp, channel);
+    rtio_output(timestamp, channel, 2, sensitivity);
 }
 
 long long int ttl_get(int channel, long long int time_limit)
 {
     long long int r;
-    int status;
 
-    rtio_chan_sel_write(channel);
-    while((status = rtio_i_status_read())) {
-        if(status & RTIO_I_STATUS_OVERFLOW) {
-            rtio_i_overflow_reset_write(1);
-            artiq_raise_from_c("RTIOOverflow",
-                "RTIO overflow at channel {0}",
-                channel, 0, 0);
-        }
-        if(rtio_get_counter() >= time_limit) {
-            /* check empty flag again to prevent race condition.
-             * now we are sure that the time limit has been exceeded.
-             */
-            if(rtio_i_status_read() & RTIO_I_STATUS_EMPTY)
-                return -1;
-        }
-        /* input FIFO is empty - keep waiting */
-    }
+    rtio_input_wait(time_limit, channel);
     r = rtio_i_timestamp_read();
     rtio_i_re_write(1);
     return r;
@@ -60,8 +31,5 @@ long long int ttl_get(int channel, long long int time_limit)
 
 void ttl_clock_set(long long int timestamp, int channel, int ftw)
 {
-    rtio_chan_sel_write(channel);
-    rtio_o_timestamp_write(timestamp);
-    rtio_o_data_write(ftw);
-    rtio_write_and_process_status(timestamp, channel);
+    rtio_output(timestamp, channel, 0, ftw);
 }