Has anybody used this work lately. I used it a long time ago with no
problems but now I cannot get the device to communicate to the python
script. The Arduino compiler has upgraded a lot since the release of
this work and some functions are deprecated or no longer supported. I
changed the Snippet
Serial.print((v >> 7) | 0x80, BYTE);
to
Snippet Serial.write((v >> 7) | 0x80);
but the python script does not see the start byte at all.
The Arduino Code
Snippetvoid setup() {
Serial.begin(9600);
}
uint8_t adc=0;
uint8_t firstbyte=0;
uint8_t pinmap[6] = {2,4,7,8,12,13};
uint8_t dacpinmap[6] = {3,5,6,9,10,11};
void loop() {
while(Serial.available())
{
uint8_t byte = Serial.read();
if(((firstbyte & 0x80) == 0x80) && ((byte & 0x80) == 0)) {
// got a packet
uint16_t payload = (firstbyte << 7) | byte;
uint8_t address = (firstbyte >> 4) & 7;
uint8_t dac = payload & 0xff;
uint8_t dir = (payload & 0x100) == 0x100;
uint8_t out = (payload & 0x200) == 0x200;
if(address < 6) {
analogWrite(dacpinmap[address], dac);
digitalWrite(pinmap[address], out);
pinMode(pinmap[address], dir);
}
}
firstbyte = byte;
}
uint16_t v = analogRead(adc) | (adc << 11);
if(digitalRead(pinmap[adc])) v |= (1<<10);
Serial.write((v >> 7) | 0x80);
Serial.write(v & 0x7f);
adc = (adc + 1) % 6;
}
and the python stuff
import serial
import hal
import sys
import time
def encode(addr, data):
if data < 0 or data > 2048: raise ValueError, "data %02d out of range" %
data
if addr < 0 or addr > 8: raise ValueError, "address %02d out of range" %
addr
b1 = 0x80 | (addr << 4) | (data >> 7)
b2 = data & 0x7f
return chr(b1) + chr(b2)
PORT = "/dev/ttyUSB0"
if len(sys.argv) > 1:
PORT = sys.argv[1]
if len(sys.argv) > 2:
nout = int(sys.argv[2])
else:
nout = 6
if nout > 6 or nout < 0:
raise SystemExit, "Number of digital outputs must be from 0 to 6"
pinmap = [2,4,7,8,12,13]
dacpinmap = [3,5,6,9,10,11]
ser = serial.Serial(PORT, 9600, timeout=2)
c = hal.component("arduino")
for port in range(6):
c.newpin("analog-in-%02d" % port, hal.HAL_FLOAT, hal.HAL_OUT)
c.newparam("analog-in-%02d-offset" % port, hal.HAL_FLOAT, hal.HAL_RW)
c.newparam("analog-in-%02d-gain" % port, hal.HAL_FLOAT, hal.HAL_RW)
c.newpin("analog-out-%02d" % dacpinmap[port], hal.HAL_FLOAT, hal.HAL_IN)
c.newparam("analog-out-%02d-offset" % dacpinmap[port], hal.HAL_FLOAT,
hal.HAL_RW)
c.newparam("analog-out-%02d-scale" % dacpinmap[port], hal.HAL_FLOAT,
hal.HAL_RW)
c['analog-in-%02d-gain' % port] = 1.0
c['analog-out-%02d-scale' % dacpinmap[port]] = 1.0
for port in range(nout):
c.newpin("digital-out-%02d" % pinmap[port], hal.HAL_BIT, hal.HAL_IN)
c.newparam("digital-out-%02d-invert" % pinmap[port], hal.HAL_BIT,
hal.HAL_RW)
for port in range(nout, 6):
c.newpin("digital-in-%02d" % pinmap[port], hal.HAL_BIT, hal.HAL_OUT)
c.newpin("digital-in-%02d-not" % pinmap[port], hal.HAL_BIT, hal.HAL_OUT)
c.newparam("digital-in-%02d-pullup" % pinmap[port], hal.HAL_BIT,
hal.HAL_RW)
c.ready()
firstbyte = 0
state = 0
try:
while 1:
while ser.inWaiting():
byte = ord(ser.read())
if firstbyte & 0x80 == 0x80 and byte & 0x80 == 0:
v = (firstbyte << 7) | byte
port = (v >> 11) & 7
if port < 6:
if port >= nout:
b = v & 1024
c['digital-in-%02d' % pinmap[port]] = b != 0
c['digital-in-%02d-not' % pinmap[port]] = b == 0
gain = c['analog-in-%02d-gain' % port] or 1.
offset = c['analog-in-%02d-offset' % port]
value = (v & 1023) / 1023. * 5.0 * gain + offset
c['analog-in-%02d' % port] = value
firstbyte = byte
scale = c['analog-out-%02d-scale' % dacpinmap[state]] or 1.
offset = c['analog-out-%02d-offset' % dacpinmap[state]]
data = (c['analog-out-%02d' % dacpinmap[state]] - offset) / scale / 5
data = int(data * 255 + 0.5)
if data < 0: data = 0
if data > 255: data = 255
if state < nout:
out = not c['digital-out-%02d' % pinmap[state]]
invert = not c['digital-out-%02d-invert' % pinmap[state]]
if out != invert:
data |= 0x200
data = data | 0x100
else:
pullup = c['digital-in-%02d-pullup' % pinmap[state]]
if pullup:
data |= 0x200
data = data | (state << 11)
ser.write(chr(0x80 | (data >> 7)))
ser.write(chr(data & 0x7f))
state = (state+1) % 6
time.sleep(.001)
except (KeyboardInterrupt,):
raise SystemExit, 0
--
Regards /Groete
Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
QQ 1767394877
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