diff --git a/linux/ramp.mpy b/linux/ramp.mpy
new file mode 100644
index 0000000..593eb79
--- /dev/null
+++ b/linux/ramp.mpy
@@ -0,0 +1,36 @@
+from micropython import const
+from time import sleep_us
+import machine
+
+dac_sel = const(4026531844)
+dac_arm = const(4026531852)
+dac_fin = const(4026531848)
+dac_from = const(4026531856)
+dac_to = const(4026531860)
+
+machine.mem8[dac_sel] = 1
+
+def dac_comm(val):
+	machine.mem32[dac_to] = val
+	machine.mem8[dac_arm] = 1
+	while machine.mem8[dac_fin] == 0:
+		pass
+	machine.mem8[dac_arm] = 0
+
+def dac_read(val):
+	dac_comm(1 << 23 | val)
+	dac_comm(0)
+	v = bin(machine.mem32[dac_from])
+	print(v, len(v) - 2)
+
+# dac_comm(0b11010010001)
+dac_comm(1 << 22 | 1 << 2)
+dac_comm(1 << 21 | (1 << 1))
+dac_read(1 << 21)
+
+def dac_ramp_up(fromval,toval,step,ival):
+	assert step > 0
+	while fromval <= toval:
+		dac_comm(1 << 20 | fromval)
+		sleep_us(ival)
+		fromval = fromval + step
diff --git a/linux/test.mpy b/linux/test.mpy
new file mode 100644
index 0000000..04390fc
--- /dev/null
+++ b/linux/test.mpy
@@ -0,0 +1,41 @@
+from micropython import const
+import machine
+from time import sleep_us
+
+dac_sel = const(4026531844)
+dac_arm = const(4026531852)
+dac_fin = const(4026531848)
+dac_from = const(4026531856)
+dac_to = const(4026531860)
+
+adc_fin = const(4026531864)
+adc_arm = const(4026531868)
+adc_dat = const(4026531872)
+adc_sel = const(4026531840)
+
+machine.mem8[dac_sel] = 1
+
+def dac_comm(val):
+	machine.mem32[dac_to] = val
+	machine.mem8[dac_arm] = 1
+	while machine.mem8[dac_fin] == 0:
+		pass
+	machine.mem8[dac_arm] = 0
+
+def dac_read(val):
+	dac_comm(1 << 23 | val)
+	dac_comm(0)
+	v = bin(machine.mem32[dac_from])
+	print(v, len(v) - 2)
+
+# dac_comm(0b11010010001)
+dac_comm(1 << 22 | 1 << 2)
+dac_comm(1 << 21 | (1 << 1))
+dac_read(1 << 21)
+
+machine.mem8[adc_sel] = 1
+def adc_read():
+	machine.mem8[adc_arm] = 1
+	sleep_us(5)
+	machine.mem8[adc_arm] = 0
+	return machine.mem32[adc_dat]
diff --git a/linux/test_dac.py b/linux/test_dac.py
deleted file mode 100644
index 43c0bab..0000000
--- a/linux/test_dac.py
+++ /dev/null
@@ -1,10 +0,0 @@
-import machine
-from micropython import const
-
-dac_0_arm = Const(4026531852)
-dac_0_finished = Const(4026531848)
-
-machine.mem8[dac_0_arm] = 1
-while machine.mem8[dac_0_finished] != 1:
-    pass
-machine.mem8[dac_0_arm] = 0