runtime: add rtio_oe and rtio_get syscalls

artiq/devices/runtime.py

@@ -9,9 +9,11 @@ lt.initialize_all()
 _syscalls = {
     "rpc": "i+:i",
     "gpio_set": "ii:n",
+    "rtio_oe": "ii:n",
     "rtio_set": "Iii:n",
     "rtio_replace": "Iii:n",
     "rtio_sync": "i:n",
+    "rtio_get": "i:I",
     "dds_program": "iiI:n",
 }
 

soc/runtime/rtio.c

@@ -7,6 +7,12 @@ void rtio_init(void)
     rtio_reset_write(1);
 }
 
+void rtio_oe(int channel, int oe)
+{
+    rtio_chan_sel_write(channel);
+    rtio_oe_write(oe);
+}
+
 void rtio_set(long long int timestamp, int channel, int value)
 {
     rtio_reset_write(0);
@@ -30,3 +36,18 @@ void rtio_sync(int channel)
     rtio_chan_sel_write(channel);
     while(rtio_o_level_read() != 0);
 }
+
+long long int rtio_get(int channel)
+{
+    long long int r;
+
+    rtio_chan_sel_write(channel);
+    while(rtio_i_readable_read() || (rtio_o_level_read() != 0)) {
+        if(rtio_i_readable_read()) {
+            r = rtio_i_value_read();
+            rtio_i_re_write(1);
+            return r;
+        }
+    }
+    return -1;
+}

soc/runtime/rtio.h

@@ -2,8 +2,10 @@
 #define __RTIO_H
 
 void rtio_init(void);
+void rtio_oe(int channel, int oe);
 void rtio_set(long long int timestamp, int channel, int value);
 void rtio_replace(long long int timestamp, int channel, int value);
 void rtio_sync(int channel);
+long long int rtio_get(int channel);
 
 #endif /* __RTIO_H */

soc/runtime/symbols.c

@@ -10,9 +10,11 @@
 static const struct symbol syscalls[] = {
     {"rpc", rpc},
     {"gpio_set", gpio_set},
+    {"rtio_oe", rtio_oe},
     {"rtio_set", rtio_set},
     {"rtio_replace", rtio_replace},
     {"rtio_sync", rtio_sync},
+    {"rtio_get", rtio_get},
     {"dds_program", dds_program},
     {NULL, NULL}
 };