Serout/serout2

[mister_e]

O.K. Let's try something first. A very simple test program test to send a text string to your PC via COM port. You'll use the MCS serial communicator (F4 then F9 to connect to the PORT)

    '
    '    Hardware configuration
    '    ======================
    @ __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF & _LVP_OFF & _BODEN_ON 
         ' Internal Oscillator
         ' Disable watch dog timer
         ' Enable power up timer
         ' Disable MCLR pin
         ' Disable low voltage programming
         ' Enable brown out detect         

    TRISB=0                            ' PORTB : output to all i/o
         
    '                      
    '    Hardware connection
    '    ===================
    SerPin         var PORTB.4         ' Serial data out connected via 1K resistor
                                       ' to PIN 2 of PC DB9 connector
                                       ' Don't forget the GND :o)
    
    '
    '    Serial Communication definition
    '    ===============================
    BAUD           con 16780           ' 2400 Baud, Driven inverted, No Parity          

    '
    '    Software/Hardware initialisation
    '    ================================
    serpin = 0                         ' Set Serial data out to normal state  
    pause 100                          ' safe settle time
    
    '
    '    ////////////////////////////////|\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\        
    '
    '                             Program Start Here                               
    '
    '    ////////////////////////////////|\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\        
    '    
START:
    SEROUT2 SERPIN,BAUD,["PC COMMUNICATION TEST",13,10]
    PAUSE 500
    GOTO START

if you use PM as assembler, use the following config fuses OR set them manually.

    '
    '    Hardware configuration
    '    ======================
    asm     
        DEVICE PIC16F628, INTRC_OSC_NOCLKOUT ; Internal Oscillator
        DEVICE PIC16F628, WDT_OFF            ; Disable watch dog timer
        DEVICE PIC16F628, PWRT_ON            ; Enable power up timer
        DEVICE PIC16F628, MCLR_OFF           ; Disable MCLR pin
        DEVICE PIC16F628, BOD_ON             ; Enable brown out detect    
        DEVICE PIC16F628, LVP_OFF            ; Disable low voltage programming
        ENDASM

is the above work?

[fowardbias]

Mr.E,
As you suggested, I ran the communications test program through the serial port via the MCS and everything was right on. It filled up the receive window with the expected text. Without a scope check on RB4 when hooked up to the H-bridge I don't think I can do to much more with this, other than fine tuning the DEFINE CHAR_PACING ? If you have any other ideas on what to try I'll give them a go. Thanks for lifting the bar to the next level. JS

[mister_e]

well hard to say if the CHAR_PACING is the solution to this. It's possible that the internal OSC is not too much accurate for a proper serial comm to your device. mmm, can you try to use an external 4MHZ crystal (not ceramic resonator) first?

How about DEBUG function ?

How about the internal USART (HSERIN/HSEROUT)?

maybe.. maybe...

[fowardbias]

Quick follow up on the H-bridge. I'm now running an external 14 Pin DIP clock at 4 Mhz.,100ppm. I ran the communications test program by adding the folowing ASM
DEVICE PIC16F628, XT_OSC
DEVICE PIC16F628, CPD_OFF
DEVICE PIC16F628, PROTECT_OFF
This makes the MCS come up right on without double checking everything.
The comm. test ran perfectly. The motor did the same routine....a little hum. I ran the motor supply volts up some to the bridge and one time it picked up one of the speeds, ? go figure? ,nothing after this one time event. I added character pacing of 1000, no change. I think I'll experiment with some different pacing values before moving into the USART. For those out there having unusal wierd problems with compiler errors when their code is exactly the same as a previous good program, I have found that there may be a glitch between going from one computer to another (different operating systems) with files on a 3 1/2 floppy. Maybe I have some bad disks although the formats were clean. Is the latest version of MCS OK or does the BETA need a little more BETTER? Later JS