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