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Great. That makes it easy.
After installing MPLAB ...
In MCS, go to the View | Compile and Program Options | Assembler Tab
Click the Find Manually ... button and point it to
C:\program files\microchip\mpasm suite
Then check the Use MPASM checkbox.
You should be good to go.
<br>
DT
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OOPs, one more thing to get that to compile.
In your PBP folder, open the 16F877A.INC file, and comment out the __config line with a semicolon ;
Now you should be good to go.
mister_e,
At least now I know where to go if I need some extra wire.
Sheesh.
<br>
DT
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Hi Darrel. I have installed MPLAB IDE v8.00 Full Release and setup was done as mentioned.
Now when compiled I get the MPASM window showing the process and then shows 18 errors.
This goes by very fast and starts green and then goes red. The errors are similar to what I had before. Here are a few. I have omitted the path for each error.
205 : Found label after column 1. (WritePort)
205 : Illegal opcode(_Char)
234 : Illegal opcode(_LCD_DATAUS)
249 : Found label after column 1.(DelayUS)
267 : Illegal opcode(LCD_COMMANDUS)
and many more
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Arrrrgh!
Sorry to put you thru all this, it shouldn't be that hard.
I can't really say what's happening from the errors you showed.
I could probably see what's wrong if you could send the .LST file.
It'll be too big to post, but you could email it to
darrel at pbpgroup.com
It should've worked
<br>
DT
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you all must have cringed when i posted my first blinky on bread board. lol mine are true ratsnests. guess it's time to buy some neato jumpers and stop being a disgrace. sniff lol
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Have a look at the last lines of the link... About The Author..Originally Posted by Darrel Taylor
mister_e,
At least now I know where to go if I need some extra wire.
Sheesh.
<br>i'm afraid
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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And to think I did not have to go to school to be that messyHave a look at the last lines of the link... About The Author.. i'm afraid
Dave
Always wear safety glasses while programming.
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A CMOS chip as a buffer (such as 4050) can be added to the parallel cable to use longer wires. Also some resistors will help to make a kind of current loop by placing 2.2-4.7 Kohms close to inputs of the LCD unit.
LCD_Lines CON 2 ' # of Lines on LCD, 1 or 2 (Note: use 2 for 4 lines)
LCD_DATAUS CON 50 ' Data delay time in us
LCD_COMMANDUS CON 2000 ' Command delay time in us
"Data delay time" should be longer, such as 500 microseconds or longer. This will help the commads to reach display safely. Pulse decreases because of cable capacitance and resistance (RC time constant). LCD displays can load data in its register buffers in a very short period but cannot execute it as fast as loading. Thats why command delay time is 40 times longer.
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Thanks Dideco for your input, I will carry on with Darrel's method for now as I find it quite interesting and I have been at it for a while. Darrel, here is what I have found so far. I have been able to get your Hijack routines to work without any errors. I am now able to see a perfect display on long lengths of cable. I have tried 20 to 40 ft of 22 awg multi-cable and the display is perfect. I did not need to adjust any delays. I have not been able though, to get the displays to switch properly using the method you described for your 2 LCD's on one pic display method. Have a look at Display_1 and you will see the display is correct using your sample code. On Display_2 you will notice that there are problems on both displays when using the hijack routines.
Thanks.
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HI wildbilly,
Sounds like your up to speed with me now.
I've been bogged down all week with work, so I'm kind of glad you had problems.
I'm sure it's not the same from your point of view.
So anyhow, I've found that the resistors used to select each display seem to act as a filter with the extra capacitance of the ribbon. The enable line gets rounded off pretty bad.
Fortunately, with "HighJack", we're not limited to just one Enable pin anymore.
We can have as many as needed. And that's the next step.
We'll use the previous "Disable" pins as the "Enable" line for each LCD. The resistors are no longer needed. Then instead of Disabling the display you don't want to write to, you'll Enable the one's you do want.
This takes a few modifications, but it's not too bad.
First, in the main program, change the LCD definitions to this ...Next, in the LCD_AnyPin file, there's a section that says "DO NOT Change anything below this line".Code:;----[ Change these to match your LCD ]--------------------------------------- LCD_DB4 VAR PORTB.0 LCD_DB5 VAR PORTB.1 LCD_DB6 VAR PORTB.2 LCD_DB7 VAR PORTB.3 LCD_RS VAR PORTB.4 LCD_E1 VAR PORTB.5 LCD_E2 VAR PORTB.6 LCDEN VAR BYTE BANK0 ; Enable bits for each LCD LCD1EN VAR LCDEN.0 LCD2EN VAR LCDEN.1 LCD_Lines CON 2 ; # of Lines on LCD, 1 or 2 (Note: use 2 for 4 lines) LCD_DATAUS CON 50 ; Data delay time in us LCD_COMMANDUS CON 2000 ; Command delay time in us INCLUDE "LCD_AnyPin.pbp" ; *** Include MUST be AFTER LCD Pin assignments **** LOW LCD_E1 ; Start with Enables OUTPUT LOW LOW LCD_E2
Change it to this ...
And finally, also in the LCD_AnyPin file, change LCD_Init to this ...Code:ASM LCD_Port_HNIB macro ; Port definition for LCD High Nibble Vbit LCDCDFLAG, _LCD_RS ; Select Command/Data register DelayUS 2 NOP Vpin 4, _LCD_DB4 ; Put the High Nibble on the bus Vpin 5, _LCD_DB5 Vpin 6, _LCD_DB6 Vpin 7, _LCD_DB7 DelayUS 2 btfsc _LCD1EN ; Set enable(s) High bsf _LCD_E1 btfsc _LCD2EN bsf _LCD_E2 DelayUS 5 ; hold for 5us bcf _LCD_E1 ; Enable(s) Low - Clocks data bcf _LCD_E2 endm ;----------------------- LCD_Port_LNIB macro ; Port definition for LCD Low Nibble Vpin 0, _LCD_DB4 ; Put the Low Nibble on the bus Vpin 1, _LCD_DB5 Vpin 2, _LCD_DB6 Vpin 3, _LCD_DB7 DelayUS 2 btfsc _LCD1EN ; Set enable(s) High bsf _LCD_E1 btfsc _LCD2EN bsf _LCD_E2 DelayUS 5 ; hold for 5us bcf _LCD_E1 ; Enable(s) Low - Clocks data bcf _LCD_E2 endm ENDASMCode:;----[Initialize the LCD]-------------------(DO NOT Change)------------------- LCD_Init: @ OutputPort LCD_Port_HNIB ; Set LCD bus to OUTPUT LCDEN = 1 + 2 LOW LCD_RS ; Start with RS LOW Char = 3 : gosub LCDsendShortCOM : @ DelayUS 6000 gosub LCDsendShortCOM : @ DelayUS 1000 gosub LCDsendShortCOM : @ DelayUS 1000 Char = 2 : gosub LCDsendShortCOM : @ DelayUS 1000 ; Start 4-bit mode Char = $28 : gosub LCDsendCOM ; Function Set, 4-bit, 2-line, 5x7 Char = $0C : gosub LCDsendCOM ; Display ON Char = $01 : gosub LCDsendCOM ; Clear Screen Char = $06 : gosub LCDsendCOM ; Entry Mode LCD_Initialized = 1 ; LCD has been Initialized goto LCDAfterInit
Click image to enlarge.
P.S. Until now I thought that 6 inches was the limit for LCD's. Just because somebody told me that once.
This is really cool. Thanks for the interesting things to play with.<hr>
ADDED: Oops, forgot to show you how to use it..Code:LCDEN = 1 LCDOUT $FE,1, "Display 1" LCDEN = 2 LCDOUT $FE,1, "Display 2" LCDEN = 1 + 2 LCDOUT $FE,$C0, "Both Displays"
DT
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