MCSPlus serial interface to EasyPIC6 not working?

**Darrel Taylor** · - 10th March 2010, 02:29

Hint:

There are 2 buttons available in mister-e's program ...

**mackrackit** · - 10th March 2010, 02:47

Post #7 ??

**Darrel Taylor** · - 10th March 2010, 03:00

Exactly, post #7 is a good example of the same problem.

Setting registers, instead of DEFINEs for HSERIN/OUT.

**mackrackit** · - 10th March 2010, 03:36

Post #7 should have the correct settings.

What is wrong with setting registers? I do this at times when I need to change the baud rate on the fly.

**Darrel Taylor** · - 10th March 2010, 03:36

Hmmm, suddenly I was in a world where everything was reversed.

Such as using defines when reading RCREG.
Turned into setting regs when using HSERIN.

Strange ... very strange ...
OOPS

**Ioannis** · - 11th March 2010, 08:24

Originally Posted by Darrel Taylor

Hmmm, suddenly I was in a world where everything was reversed.

Such as using defines when reading RCREG.
Turned into setting regs when using HSERIN.

Strange ... very strange ...
OOPS

I'd like one of those too, please

Ioannis

**mackrackit** · - 11th March 2010, 09:47

I have pins
RC7 connected to MAX232 pin 12
RC6 connected to MAX232 pin 11

MAX232 pin 13 connected to DB9 pin3
MAX232 pin 14 connected to DB9 pin2

Both of the codes below do the same thing. I do not have an EasyPic board but this has been tested on breadboard.

Code:

'16F887 HERSIN/OUT
   @ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF
   OSCCON = %01110000
   DEFINE OSC 8
   DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
   DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 0
   DEFINE HSER_CLROERR 1 ' Clear overflow automatically
   DEFINE HSER_SPBRG 51  ' 9600 Baud @ SPBRGH = 0      25 FOR 4MHz
   BAUDCTL.3 = 1         ' Enable 16 bit baudrate generator
   X    VAR BYTE
   RUN:
   HSERIN [X]
   HSEROUT [X,$d,$a]
   GOTO RUN

Code:

'16F887 HERSIN/OUT    #2
   @ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF
   OSCCON = %01110000
   BAUDCTL.3 = 1         
   X    VAR BYTE
   RUN:
   RCSTA=$90:TXSTA=$20:SPBRG=51
   HSERIN [X]
   RCSTA.4 = 0 : RCSTA.4 = 1
   HSEROUT [X,$d,$a]
   GOTO RUN

**aratti** · - 11th March 2010, 14:09

Did you check the cable connecting the two units? There is the possibility that you have Rx connected to Rx. See the attached picture.

Al.

**jellis00** · - 11th March 2010, 00:14

Originally Posted by Darrel Taylor

Hint:

There are 2 buttons available in mister-e's program ...

OK, I judge by the exchanges between DT and Mackrackit that I should have used the DEFINES button with Mister_e's PICMultiCalc. So I did. However, as a change in approach to my troubleshooting to isolate this UART problem with my PBP code, I have taken the following approach:
1) Since I know that my EasyPic6 UART interface works with the sample loopback routine that came with it that is written in microelekBasic (see earlier post) for a 16F887 chip, I have discarded my 18F4550 chip for now to see if I can get PBPro code that is functionally identical to the microBasic routine to also work with the 16F887 chip in the EasyPic6.
2) I have insured the _configs for my code result in the identical config bits that are generated by the microBasic code with the EasyPic6.
3) Please see this PBPro code below and note the configs that appear to be equivalent to the microBasic version and also how I used PICMultiCalc to define the UART setup and then studied the data sheet for the 16F877 to make sure it was correct, as shown by my extensive commenting of the UART setup.
4) I then programmed the 16F887 chip using MCSPlus, PBPro 2.6 compiler, MPASM assembler, and the PICFLASH interface to actually download the .hex file to the chip. PICFLASH also permits me to double check the configs before burning the chip.
5) After the chip is running, I then tried HYPERTERM to type some characters over the interface. Nothing indicated on HYPERTERM in the received loopback, although this same process worked with the microBasic routine.
6) Also tried the comm interface in MCSPlus to communicate with the running code and although it showed that the typed characters were accumulating in the TX tally at the bottom of the screen, no characters were being tallied in the RX entry. SAME PROBLEM AS OBSERVED WITH 18F4550!!

7) In all of the above cases I assured that both the PC and the PIC ends of the EUART interface were set to COM1/9600/8bits/no parity/1 stop bit.

The continuing failure of the PBPro code, that is as close to identical to the microBasic code as I can make it, is very frustrating to me!
Can anyone see what is wrong with this PBPro code to cause it to continue to fail in this loopback test between a PC terminal and the running PIC??

Code:

;--- if you un-comment these, you must comment the ones in the .inc file--
ASM ; 16F887, 8mhz crystal
   __CONFIG    _CONFIG1, _HS_OSC & _WDT_OFF & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _IESO_ON & _FCMEN_ON  & _LVP_OFF & _CP_OFF & _BOR_OFF
ENDASM
Include "Modedefs.Bas"

DEFINE OSC 8
'Register Settings
    TRISB = %00000000	    ' Set PORTB to outputs as test LEDs
    TRISC.6 = 1             ' EUSART control will automatically reconfigure
    TRISC.7 = 1             ' these pins from input to output as needed.

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
                      ' RCSTA.7 = SPEN = 1 for Serial port enabled (configures 
                      ' RX/DT & TX/CK pins as serial port pins).
                      ' RCSTA.4 = CREN = 1 for Asynchronous Continuous Receive                  
                      ' Therefore RCSTA = %10010000 = 90h
DEFINE HSER_TXSTA 20h ' Enable transmit, 8-bit, Asynchronous mode
                      ' TXSTA.5 = TXEN = 1 for Transmit enabled
                      ' TXSTA.4 = SYNC = 0 for Asynchronous mode
                      ' TXSTA.2 = BRGH = 0 for High Speed Asynchronous Baud Rate                               
                      ' Therefore TXSTA = %00100000 = 20h
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
DEFINE HSER_SPBRG 51  ' 9600 Baud @ 8MHz, 0.16%, , 51 = 33h = %00110011
SPBRGH = 0
BAUDCTL.3 = 1         ' Enable 16 bit baudrate generator
    
INCLUDE "ALLDIGITAL.pbp"    ' Sets all registers for digital ops.
                            ' User must make sure the AllDigital.pbp file 
                            ' is in same directory location as this source
                            ' code before compiling.
    PORTB = 0               ' Turn off the LEDs
    HIGH PORTB.4            ' Blink the one Test LED as proof MCU is running
    PAUSE 500               ' at tiime of power up.
    LOW PORTB.4

' Declare variables
X VAR BYTE                  ' Variable holds received character from UART

START:
    HSERIN [DEC X]
    PORTB.5 = 1         ' Turn on PortB.6 LED if this statement is executed
                        ' as a test of receiving a character.
    HSEROUT [DEC X,$d,$a]
    PORTB.6 =1          ' Turn on PortB.7 LED if this statement is executed
                        ' as a test of HSEROUT having sent a character.
GOTO START

**mackrackit** · - 11th March 2010, 00:28

Hang in there. We will get it working.

But

Where's the code?

**jellis00** · - 11th March 2010, 00:31

Here is the code for previous post

Thread: MCSPlus serial interface to EasyPIC6 not working?

Thread Tools

Search Thread

Display

Hybrid View

Change in approach to troubleshooting UART interface

Here is the code for previous post

Similar Threads

Please help with EDE702 - Serial to LCD interface

32-bit Quadrature Counter With Serial Interface

Serial interface with RFID reader

ifficult to get the serial interface GSM phon

PIC16F877 to RFID Module Serial Interface

Members who have read this thread : 1

Bookmarks

Bookmarks

Posting Permissions