add convenience function for setting the output mode of the ad5791 DAC

lib/__init__.py

@@ -26,6 +26,7 @@ from lib.system import (
     CONNECTIONS,
     FLIR,
     MOGRF,
+    ad5791_init_val,
 )
 from lib.dataio import (
     get_timestamp,

lib/system.py

@@ -74,3 +74,20 @@ FLIR = Grasshopper(FLIR_SERIAL)
 MOGRF_COM = 3
 MOGRF = MOGDriver("COM", MOGRF_COM)
 
+def ad5791_init_val(register: int, value: int) -> int:
+    """
+    Returns the 24-bit integer value to send to the AD5791 DAC encoding the
+    operation mode.
+
+    Parameters
+    ----------
+    register : uint8
+    value : uint24
+    """
+    r = register % 256
+    B10 = value % 65536
+    B2 = (value >> 16) % 256
+    return (((B2 & 0x0f) | r) << 16) + B10
+
+AD5791_CTRL = ad5791_init_val(0x20, 0x0012)
+