barcode scanner sdk vb.net Understanding a 16-CharaCter-by-2-Line LCd dispLay in Software

Generation QR Code 2d barcode in Software Understanding a 16-CharaCter-by-2-Line LCd dispLay

Understanding a 16-CharaCter-by-2-Line LCd dispLay
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Listing for Program LCDRoutines4 (continued)
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{{Check for busy }} PUB CHECK_BUSY | BUSY_BIT 'routine to check busy bit OUTA[ReadWrite] := 1 'Set to read the busy bit OUTA[RegSelect] := 0 'Set to read the busy bit DIRA[DataBit7..DataBit4] := %0000 'Set the entire port to be an input REPEAT 'Keep doing it till clear OUTA[Enable] := 1 'set to 1 to get ready to toggle H>L this bit BUSY_BIT := INA[DataBit7] 'the busy bit is bit 7 of the byte read 'INA is the 32 input pins on the PROP and we 'are reading data bit 7 which is on pin 15! OUTA[Enable] := 0 'make the enable bit go low for H>L toggle WHILE (BUSY_BIT == 1) 'do it as long as the busy bit is 1 DIRA[DataBit7..DataBit4] := %1111 'done, so set the data port back to outputs {{Print a decimal value, whole numbers only }} PUB PRINT_DEC (VALUE) | TEST_VALUE 'for decimal format IF (VALUE < 0) 'if it is a negative value -VALUE 'change it to a positive SEND_CHAR("-") 'and print a - sign on the LCD TEST_VALUE := 1_000_000_000 'we get individual digits by compar to this 'value and then dividing by 10 to get next val REPEAT 10 'There are 10 digits maximum in system IF (VALUE => TEST_VALUE) 'see if our number is > than testValue SEND_CHAR(VALUE / TEST_VALUE + "0") 'divide to get the digit VALUE //= TEST_VALUE 'figure the next value for the next digit RESULT~~ 'result of what just did pass it on below ELSEIF (RESULT OR TEST_VALUE == 1) ' a 1 then div was even SEND_CHAR("0") 'so we sent out a zero TEST_VALUE /= 10 ' test for the next digit {{Print a Hexadecimal value }} PUB PRINT_HEX (VALUE, DIGITS) 'for printing values in HEX format VALUE <<= (8 - DIGITS) << 2 ' up to 8 digits or FFFFFFFF max REPEAT DIGITS 'do each digit SEND_CHAR(LOOKUPZ((VALUE <-= 4) & $F : "0".."9", "A".."F")) 'use lookup table to select character {{Print a Binary value }} ' PUB PRINT_BIN (VALUE, DIGITS) 'for printing values in BINARY format VALUE <<= 32 - DIGITS '32 binary digits is the max for our sys REPEAT DIGITS 'Repeat for each digit desired SEND_CHAR((VALUE <-= 1) & 1 + "0") 'send a 1 or a 0 (continued)
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Listing for Program LCDRoutines4 (continued)
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{{Clear screen }} PUB CLEAR SEND_INSTRUCTION2 (%0000_0001)
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{{Go to position 1,1 Does not clear the screen }} PUB HOME 'go to position 1,1. SEND_INSTRUCTION2 (%0000_0011) 'LCD not cleared {{Print spaces }} PUB SPACE (qty) repeat (qty) PRINT(STRING(" "))
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'Prints spaces, for between numbers
These routines have to be maintained and improved upon as time goes by. They will reflect how you use the Propeller and what code you borrow from the work of others. This will continue to be a work in progress.
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Running MotoRs: A PReliMinARy Discussion
There are times when you need to move something as a part of what you need to do with a microcontroller. The easiest way to do this, of course, is with a small motor or sometimes a solenoid. In this chapter we discuss the scope of what we will be covering in the upcoming chapters.
note Running large motors is very much like running small motors, except you need larger amplifiers and you have to provide for more safety interlocks because a lot of energy is being handled. Therefore, you have to do everything possible to keep things from getting out of hand.
The control of the following types of motors will be covered:
R/C hobby servos Stepper motors (bipolar) Small Permanent Magnet Direct Current motors DC motors with encoders attached for feedback Relays, solenoids, and AC motors of about a quarter horsepower
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