Wireless modules - help with code not working

[tasmod]

Hi Dick, Loannis,

I received the modules back on Friday just as I was leaving to have a few days away for the Holiday long weekend in UK.

They have been tested as OK but that doesn't relate as I couldn't measure any RF out when I sent them back. Never the less I believe Ciseco, so I'm continuing by etching two new pcbs with link pad outputs so I can link any pin to the module.

They should be complete today and populated. Then I will do more tests.

The speed issue came up so I'm running at 10MHz so 9600 should work reliably. As for True, well the Picaxe code sample seems to use N9600 but I seem to remember I didn't trust this. So I wrote a loop of serout/serin with all baud rates one after another for testing. I think I mentioned this earlier in the post. Ciseco claim any serial comms sent, will be echoed out. Their data sheet isn't any clearer.

I can use any pin/s so I will test HW serial and serout/in. Hopefully with some sort of result, as these are not my modules.

I do have access to a full professional RF spectrum test setup, however without serout/in comms working there is no point using it.

Rob

[tasmod]

At last. Working.

Redesigned pcb's but not reconfigured. Just turned pic sideways for ease of removal and added pads for each pin to facilitate cross connection, although not finally needed.

After making up the boards I wrote the most simple TX/RX routines and connected the 3 pins needed with temporary jumpers. They immediately talked to each other. Replacing the jumpers with the modules and they talked !!!!

There was one change in code that needed to be added but later removal and they still talked although not quite 100%. That was the extra first characters "SSSSSSSSBOB" before the required string to match the serin string of "BOB"


Send code -------------

Include "modedefs.bas" 
DEFINE OSC 10


TRISA = %00000000

CMCON=7

pause 2000

TEST:
    serout PortA.3, T9600,["SSSSSSSBOB"] 
    PAUSE 500
    GOTO TEST  
END

Receive code -----------------------------

Include "modedefs.bas" 
DEFINE OSC 10

TRISA = %11111101       

CMCON=7

relay var PortA.1


low relay

pause 2000

TEST:
    low relay
    pause 100
    serin PortA.2,T9600,["BOB"] 
    high relay
    PAUSE 1000
    GOTO TEST
        
END

Now I need to expand the code to do just what I want and to then add a decent antenna to get the range.

I'm considering a 'Moxon' Rectangle which gives 3dbd gain with excellent f/b ratio fitted directly to modules via short solid wire. It can be made up using UK twin earth cable wire. About 1.5mm copper. It's very small indeed at 123x46mm

Rob

[Demon]

You pause 500 after transmit, but pause 1000 after reception?

Robert

[Ioannis]

Besides what Robert noted, you have to setup port A.3 as high before transmitting. RS232 needs a standard state before tx/rx.

So, I suppose T9600 made the difference?

Include "modedefs.bas" 
DEFINE OSC 10

high porta.3
TRISA = %00000000

CMCON=7

pause 2000

TEST:
    serout PortA.3, T9600,["SSSSSSSBOB"] 
    PAUSE 500
    GOTO TEST  
END

Ioannis

[Dick Ivers]

Hi all, I'm trying the true mode, but my loopback setup is still not working.

'**************************************************************************
'*Program to test XRF radio communications via loopback method            *
'*Uses a pushbutton switch on porta pin 4                                 *
'*Target processor is PIC 12f1822                                         *
'*207 program words, revised 05/07/2013                                   *
'*Program by Dick Ivers                                                   *
'*All rights reserved                                                     *
'************************************************************************** 
'set 12f1822 configurat1on
#CONFIG
  __config _CONFIG1, _FOSC_INTOSC & _MCLRE_OFF & _CLKOUTEN_OFF & _WDTE_ON
  __config _CONFIG2, _PLLEN_OFF & _LVP_OFF
#endconfig

'set registers
        OSCCON = %01111000   '16 mhz osc
        OSCTUNE = 0          'factory calibration
        ANSELA = 0           'all digital inputs
        OPTION_REG.7 = 0     'global pullups enabled
        WPUA = %010000       'porta pin 4 weak pullup enabled
        CM1CON0.7 = 0        'comparator disabled
        TRISA  = %011110     'porta.0 & porta.5 are outputs, all others input

    while OSCSTAT.0 = 0      'wait for stable freq.
    wend
    
    define OSC 16            '16 mhz oscillator

'Define debug parameters
DEFINE DEBUG_REGG PORTA        'set debug port to porta
DEFINE DEBUG_BIT 0             'use pin ra0 of porta for debug
DEFINE DEBUG_BAUD 9600         'set baud rate to 9600
DEFINE DEBUG_MODE 0            'communicate in true mode

DEFINE DEBUGIN_REGG PORTA      'set debug port to porta
DEFINE DEBUGIN_BIT 1           'use pin ra1 of porta for debugin
DEFINE DEBUGIN_BAUD 9600       'set baud rate to 9600
DEFINE DEBUGIN_MODE 0          'communicate in true mode

    i var byte
    char var byte

    For i = 1 to 3
    porta.5 = 0              'led on
    pause 333
    porta.5 = 1              'led off
    pause 333
    next

asleep:
    nap 2   'delay 4 ms
    if porta.4 = 1 then asleep
  
DT:
    debug 55
    debugin 100,blink,[char]
    if char = 55 then
     porta.5 = 0            'led on solid
     goto halt
    endif    

blink:
    porta.5 = 0     'led
    pause 500
    porta.5 = 1     'led off
    pause 500
    if porta.4 =1 then asleep
    goto DT   
   
halt:
    stop                   'led stays on

The communications not working. The led blinks when the remote transceiver is not powered, as it should. When its powered the program should branch to a solid on led , but no it keeps blinking. Any ideas?

[Ioannis]

Dick, I would suggest at first to test your code with a PC and see if you have the PIC working. For this you will need a MAX232 or similar to invert and drive the serial port.

If this test passes please post your results. But I have a feeling that it won't.

Ioannis

P.S. Also try with capitals in define OSC 16. As this: DEFINE OSC 16. Just in case...

[Dick Ivers]

Ioannis,
PIC to PC is working. Code and setup as follows:

'**************************************************************************
'*Program to test PIC to PC communications via loopback method            *
'*Target processor is PIC 12f1822                                         *
'*142 program words, revised 05/08/2013                                   *
'*Program by Dick Ivers                                                   *
'*All rights reserved                                                     *
'************************************************************************** 
'set 12f1822 configurat1on
#CONFIG
  __config _CONFIG1, _FOSC_INTOSC & _MCLRE_OFF & _CLKOUTEN_OFF & _WDTE_ON
  __config _CONFIG2, _PLLEN_OFF & _LVP_OFF
#endconfig

'set registers
        OSCCON = %01111000   '16 mhz osc
        OSCTUNE = 0          'factory calibration
        ANSELA = 0           'all digital inputs
        OPTION_REG.7 = 0     'global pullups enabled
        WPUA = %010010       'porta pin 1 and pin 4 weak pullups enabled
        CM1CON0.7 = 0        'comparator disabled
        TRISA  = %011110     'porta.0 & porta.5 are outputs, all others input

    while OSCSTAT.0 = 0      'wait for stable freq.
    wend
    
    define OSC 16            '16 mhz oscillator

'Define debug parameters 
DEFINE DEBUG_REGG PORTA        'set debug port to porta
DEFINE DEBUG_BIT 0             'use pin ra0 of porta for debug
DEFINE DEBUG_BAUD 9600         'set baud rate to 9600
DEFINE DEBUG_MODE 1            'communicate in inverted mode

DEFINE DEBUGIN_REGG PORTA      'set debug port to porta
DEFINE DEBUGIN_BIT 1           'use pin ra1 of porta for debugin
DEFINE DEBUGIN_BAUD 9600       'set baud rate to 9600
DEFINE DEBUGIN_MODE 1          'communicate in inverted mode

    i var byte
    char var byte

    For i = 1 to 3
    porta.5 = 0              'led on
    pause 333
    porta.5 = 1              'led off
    pause 333
    next

'user input with VT100 terminal

re:     debugin [char]     
        debug char
        
        goto re

The PIC echos back to the PC correctly. Double characters display as expected. Note that the transmission mode is inverted. I believe this mode is standard for RS232 communications. Also, I am using a null modem cable (Tx and Rx reversed ). I believe this is also standard. Haven't tried the radio link yet with this set up.. Any suggestions?
Dick

p.s. The DEFINES are capitals in the actual code. Not all show this way with the pasted code.