PPDB Troubles with pin30 / 31 to TX and RX

nomad · 2010-04-14 14:55

hi,
today i become a new PPDBoard
now want a serialConnection to a linux-laptop
via the RS232 port of the board

now my problem:

1) board are on (blue led on)
2) testing: - no connections to rx/tx-pin
- F7: Propeller chip version 1 found on
COM 4

3) the normal connection to the RS232-Port
is:
Rx = chipPin31
Tx = chipPin30
when i make this and press F7:
--> No Propeller chip found on any serialPort
Scanned COM4
Scanned COM1
Scanned COM2
Unable to open COM11

4) if i connected only
chipPin30 with TX
F7: Propeller chip version 1 found on COM4

then i have download the newest FTDI USB-Driver
Version 2-0.4.16 fron parallax
the same fault.

with a multimeter p30 / p31 == 3.3Volt

now i dont know what i should do.
its urgent for me that i can handle the RS232-Port
last year with a another PPDB no troubles with this
port

Any help, hints and suggestions would be great.
please help me

excuse my i bad english.
regards
nomad

here my little testprogram in spin

{
   SERIAL_10.spin
   --------------
   dd. 14. April 2010 16.00:00 GMT 2010

   For         : SerialControl from Linux to the NewPropellerProfessionalDevelopmentBoard
                 PPDB
    
**************************************************************************
NOTES:
   - SoftWare-Development with PPDB:
     - Serial Communications with the LinuxSystem
       - serialReceive BigNumbers from linuxsystem
       - serialSend ACK
       
 TESTING RS232
1) without connection to RX / TX -> comport found at 4
2) p31 connected with RX         -> no chip found
                                    unable to open comport11
3) only p30 connected with TX    -> OK
  
4) p30 -> TX
   p31 -> RX
   unable to open comport11
                                      
   p30 TX = comport 7 ok
   p31 RX = comport 7 NOK
   
5) Install USBDriverInstallerVersion-2.0.4.16
2) Test ComPort found on ComPort4 (no connections to rs232 (rx,tx))
3) connections  Rx = p31            '                 
                       Tx = p30
   testing NOK
   no con = ok
   rx = 31 NOK
   tx = 30 OK           
**************************************************************************
}
CON
  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000

  Rx   = 31            '                 
  Tx   = 30            '                                  
  baud = 9600

  ' nicht benutzt direktes Set
  LED_1 = 7 ' extern LED14            
  LED_2 = 8 ' TO extern LED15
                                 '
    
OBJ                                              
   Serial : "Extended_FDSerial"
                  
VAR
  LONG myInput     ' SerialInput   
  
{*************************************************************************}
PUB Main
      
   Serial.Start(Rx,Tx,0,baud)   

   ' debuging Help Leds
   DIRA[noparse][[/noparse]7]~~   ' set chipPin7 to output to extern blueLed_1 ex intern LED 14
   DIRA[noparse][[/noparse]8]~~   ' set chipPin8 to output to extern blueLed_2 ex intern LED 15

   repeat
      outa[noparse][[/noparse]7]~~   'set chipPin7 Led1 HIGH
     
      myInput := Serial.rxDec       ' receive bigNumbers as ServoCommands
      waitcnt(clkfreq / 10 + cnt)

      ' EXIT PROGRAMM AND CENTER ALL SERVOS        
      IF myInput == 1
         QUIT

      IF myInput > 1
         Serial.str(string("5"))
         waitcnt(clkfreq / 10 + cnt)     
        
                
      outa[noparse][[/noparse]7]~                    ' set chipPin7 blueLed 1 LOW 

{*************************************************************************}

mctrivia · 2010-04-14 15:02

Are you trying to program the device? If so you need to connect the reset pin.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

nomad · 2010-04-14 15:20

hi,
mctrivia,
no can't programming the device with this programm.

excuse: what you mean with
"Are you trying to program the device? If so you need to connect the reset pin."

->you mean right from pin31 BOEn-pin RESn-pin??

how i can connected this pin ???

in the meantime i have tested the usb-driver with a
- propeller-Demo Board
- propellerRobotControlBoard
F7 is OK

thanks for your answer
regards nomad

hover1 · 2010-04-14 16:02

I don't think you can use Pins 30/31 as they are always connected to the USB-to-Serial chip.

For RS-232 you would not use the FTDI USB-Driver.

hover1 · 2010-04-14 16:04

Is this with the USB cable plugged in?

nomad said...

1) board are on (blue led on)
2) testing: - no connections to rx/tx-pin
- F7: Propeller chip version 1 found on
COM 4

nomad · 2010-04-15 04:04

hi hover1,
thanks for your answer

the PPDB have an extra RS232-Port (female)
with a MAX3232E chip.

with following ports:

RTS (in)
TX (out)
CTS (out)
RX (in)

i have additional a older PPDBoard buy into 2009
with this board the RS232-stuff is ok
and no Problem with the detection of
the Board

USB-Connection to winXP with Parallax-IDE
and a serialConnection to my LinuxLaptop
chipPin 30 to TX (out)
chipPin 31 to RX (in)

have parallax changing this stuff with a newer
Revision of the Board???

you wrote "i can't use the Pins 30/32"
"For RS-232 you would not use the FTDI-USB-DRIVER"

I handle the RS232-communications with
"Extended_FDSerial - object" this have nothing to do
with usb.

what should i do???

On the Parallax-Staff please give me some hints

Regards nomad

Ariba · 2010-04-15 04:31

It may be that Parallax has added the serial resistors on th Tx and Rx line to the FT232 to protect the Propeller
and the FT232 from prgramming errors.
And that was not a bad decision, if I look what you try to do.

You connect the Tx output of the FT232 and Tx output of the MAX3232 to the same pin on the Propeller (P31).
The MAX3232 has prority because of the 150 Ohm resistor, so the PC can not find the Propeller with F7.
Either you use another Pin for receiving from the RS232 port, or you add a Diode, like I show in the attached
schematic.

Andy

nomad · 2010-04-15 06:44

hi
thanks ariba for the hints,

is this right
original connections
P31 to RX (incoming)
P30 to TX (outcoming)

if i understand you:
new:
P30 to TX (outcoming)
P29 to RX (incomming)

is this right???

but the next question is:

i make the serialStuff with: Extended_FDSerial.spin (object)
and in this code is :

"Serial.Start(31,30,0, 9600)"

hardcoded,
can i change this p31 to p29 ?

please help me.
thanks
regards nomad

Ariba · 2010-04-15 09:22

OK, from the PPDB schematic, I see the RX/TX labels of the RS232 connector are swapped. IMHO a bit weird because the RTS, CTS are not swapped.

But that means for you:
P30 to TX (MAX input, Propeller output)
P27 to RX (MAX output, Propeller input)

don't use P28 and P29, they are used for the EEPROM.

For sure you can change the pin numbers of the serial.Start methode (thats why they are in the parameters):
Serial.Start(27,30,0, 9600)

If you have enough free pins, it's better to use also another pin for the TX line, perhaps 26 instead of 30:
Serial.Start(27,26,0, 9600)
So the USB port is free for debuging.

Andy

nomad · 2010-04-15 09:32

hi ariba,
thanks for the good answer:

in the meantime on switzerland its now 12.00 (time for lunch)
i now testing:

Rx = 29 ''31 '
Tx = 30 '
baud = 9600

and its ok
F7 == detect propeller on com4
program is download ok
serial-communications with my laptop
aka
linux send 12345
prop sendback 12345
should be ok
only linux makes some hicks but this is not the problem

now i test your suggestions:
P30 to TX (MAX input, Propeller output)
P27 to RX (MAX output, Propeller input)

if the test ok -> i call back

nomad · 2010-04-15 09:51

hi ariba
now i have tested the stuff as follows:
Rx = 27 ''29 ''31 '
Tx = 30 '
baud = 9600

the whole stuff are running
if i send from linux <1234>
prop sends: <1234>

i think the problem is solved ???

what you are thinking ?
thanks for verry helpful answers: you are great

regards nomad

the prop-code:

{
  Serial10.spin
**************************************************************************************
}
**************************************************************************************
}
CON
  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000

  Rx   = 27    ''29    ''31            '                 
  Tx   = 30            '                                  
  baud = 9600

  ' nicht benutzt direktes Set
  LED_1 = 7 ' extern LED14            
  LED_2 = 8 ' TO extern LED15
                                  '             
    
OBJ                                              
   Serial : "Extended_FDSerial"
                  
VAR
  LONG myInput     ' SerialInput
  LONG myOutput     ' SerialOutput
  
{******************************************************************************************}
PUB Main

   myOutput := 12345
         
   Serial.Start(Rx,Tx,0,baud)   

   ' debuging Help Leds
   DIRA[noparse][[/noparse]7]~~   ' set chipPin7 to output to extern blueLed_1 ex intern LED 14
   DIRA[noparse][[/noparse]8]~~   ' set chipPin8 to output to extern blueLed_2 ex intern LED 15
   repeat
      outa[noparse][[/noparse]7]~~   'set chipPin7 Led1 HIGH
                      
      myInput := Serial.rxDec       ' receive bigNumbers as ServoCommands
      waitcnt(clkfreq / 10 + cnt)
                    
      ' EXIT PROGRAMM AND CENTER ALL SERVOS        
  '    IF myInput == 1
  '       QUIT
                         
   '   IF myInput == 2
   '      Serial.str(string("5"))
         'Serial.dec(myInput)     
    '     waitcnt(clkfreq / 10 + cnt)

     ' IF myInput > 3
     
     Serial.dec(myInput)     
     waitcnt(clkfreq / 10 + cnt)  
        
                
      outa[noparse][[/noparse]7]~                    ' set chipPin7 blueLed 1 LOW 
{***********

PPDB Troubles with pin30 / 31 to TX and RX

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