def voltage_set(addr, chn, voltage):
""" Set the output voltage of the DAC7678;
:param addr: int, I2C address of the DAC7678;
:param chn: int, Channel number of the DAC7678, can be 0~7;
:param voltage: Target output voltage;
:return: None
"""
if voltage < 0.0 or voltage > 3.0:
print "Voltage out of range"
return
if chn < 0 or 8 <= chn:
print "Unknown channel"
return
# a,b,c,d
# i,j,k,l
maxv = 3
dac = float(voltage) / maxv
dac *= 0xFFFF
dac = int(dac)
dac_low = dac & 0xFF
dac_high = (dac >> 8) & 0xFF
# Write into selected channel
i2c.write(addr, [chn, dac_high, dac_low])
# Update Selected channel
i2c.write(addr, [0x10 | chn, 0x0, 0x0])
def write_buffer(func_id_string,data):
try:
func_id_string = func_id_string.upper()
func_id = FUN_ID_MAP[func_id_string]
wr_dat_buf = [func_id]
wr_dat_buf.extend(data)
i2c.write(I2C_ADDR,wr_dat_buf)
except KeyError:
print "[sc18is602.write_buffer]:Please input correct SS channel!"
def set_dir(addr, p0x, p1x):
i2c.write(addr, [0x6, p0x, p1x])
def all_output_low(addr):
i2c.write(addr, [0x2, 0x00, 0x00])
def all_output_high(addr):
i2c.write(addr, [0x2, 0xff, 0xff])
def all_input(addr):
i2c.write(addr, [0x6, 0xff, 0xff])
def all_output(addr):
i2c.write(addr, [0x6, 0x00, 0x00])
def set_output(addr, p0x, p1x):
i2c.write(addr, [0x2, p0x, p1x])