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four that go over the tops of the right-angle female headers; solder and snip the leads
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7 Insert the two resistors; solder and snip their
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8 Insert all the right-angle female headers Flip
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the board over with the headers in place, set it on a flat surface, and solder all the pins
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9 For each of the four right-angle female
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headers, bend and insert a jumper so that it spans the top of the header as shown in Figure 10-2 Using a small clamp to hold the header and the jumper tightly against the top of the board, solder and snip the jumper leads on the bottom of the board
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10 Insert the capacitor; solder and snip its leads 11 Insert and solder the 20-pin socket in place
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(make sure pin 1 is at H9)
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12 Insert the 10k potentiometer Flip the board
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over and support it on a flat surface
Testing the Programming Connection to the LCD Board
Next, power-down the breadboard, insert a 20X2 into the IC socket so that pin 1 is at the lower-left corner, and insert a resistorized LED into H1 so
PICAXE Microcontroller Projects for the Evil Genius
Figure 10-3 Breadboard setup for testing the completed LCD board
that its 5V lead is inserted into pin 14 of H1 and its Ground lead is inserted into pin 16 of H1 (This arrangement connects the LED to pin B7 of the 20X2) Finally, insert the AXE027 USB cable into the USBS-PA3 programming adapter and insert the adapter into H2 so that the USB cable extends behind the stripboard (see Figure 10-4) When the adapter is inserted correctly, the Serin connection will be on the left (looking from the front of the stripboard) and Serout will be on the right The following bare-bones code snippet is a simple Hello World program to test the programming connection to the LCD board Type it into the Programming Editor and download it to the 20X2 on the LCD board The LED should blink; if not, you will need to troubleshoot the wiring connections on your stripboard
'=== HelloLCDbas === #com 4 #picaxe 20X2 #no_data #no_table do toggle B7 wait 1 loop
Testing the LCD Interface
When you re sure that the programming interface is functioning correctly, we re ready to test the interface between the on-board 20X2 and the LCD The only difference between this interface and the one we used in the previous chapter is that we can no longer use the 20X2 s B6 pin for output to the LCD The software that implements this change
10
Serializing a Parallel LCD
Figure 10-4 Breadboard setup for testing the programming connection to the LCD board
(LCDtestbas) is presented in Listing 10-1 It s essentially the same as the program we worked with in 9, with three simple changes that handle the necessary pin substitution First, in the Variables section, I have added a declaration for the replacement pin (symbol newB6 outpinC1) Second, at the beginning of the main program, the dirsB statement (dirsB %10111111) has been changed to reflect the fact that pin B6 will now be an input Third, near the end of the OutCmd & OutTxt subroutine (right after the outpinsB char statement), I added the following statement: newB6 bit6, which probably requires a quick explanation The newB6 bit6 statement works because the char variable has been assigned to variable b0 and, as you remember, the bits of b0
are individually accessible If B6 were still an output, the outpinsB char statement would have assigned bit6 of char to B6 However, we have now defined B6 as an input, so nothing is assigned to it by the outpinsB char statement The additional statement (newB6 bit6) simply corrects this omission by assigning bit6 of char to newB6, which, of course, is actually pinC1 Download LCDtestbas from my website and use the Programming Editor to download it to the 20X2 on the LCD board You should see the twoline message repetitively appearing on the LCD; if not, you will need to troubleshoot the wiring connections on your stripboard
PICAXE Microcontroller Projects for the Evil Genius
LISTING 10-1 ' ================================= LCDtestbas ================================== ' Program runs on a PICAXE-20X2 at 8MHz & transmits 8-bit data ' to an HD44780 16x2 LCD display
' === Constants === symbol enable = C7 symbol RegSel = C4
' LCD enable pin connected to C7 ' LCD RegSel pin connected to C4
' === Variables symbol char symbol index symbol newB6 ' Note: newB6
=== = b0 = b1 = outpinC1 is a variable because its
' character to be sent to LCD ' used as counter in For-Next loops ' replacement pin for B6 (hserin) value can change
' === Directives === #com 3 #picaxe 20X2 #no_data #terminal off
' ' ' '
specify download port specify processor save time downloading make sure terminal is off
' === Table ====================== Table 0, ("Evil Genius LCD ") Table 16, ("Serial Display! ") ' ============================= Begin Main Program =============================== dirsB = %10111111 dirsC = %10111111 pause 200 char = 56 gosub OutCmd char = 12 gosub OutCmd ' ' ' ' ' ' ' ' set portB as outputs (except B6) set portC as outputs (except C6) *** Initialize the LCD *** pause 200 mS for LCD initialization setup for 8 bits, 2 lines, 5X7 dots send instruction to LCD display on, cursor off send instruction to LCD
' *** Main Program Loop - Send data to the LCD *** do char = 1 ' clear display & go home gosub OutCmd ' send instruction to LCD wait 1 for index = 0 to 15 readtable index, char ' send line one to LCD gosub OutTxt next index
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