9/10/2020 0 Comments Picbasic Pro Examples
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![]() Picbasic Pro Examples Code Posted SeveralOf course, the gold standard for PBP coding to deal with I2C-LCD character display devices is the elegant code posted several years ago by Darryl Taylor.See for exampIe post 3 in: My code is clunkier but Ive had good success using it and it gets the job done.It is sét up to handIe transfers in 4-bit mode, where the 4 datacommand bits can reside in the low nibble or the hi nibble of the PCF8574x PortP. The approach is that the user declares if the least significant data bit is bit 4 or bit 0, and declares which bit positions the HD44780 RS, RW, and E occupy in the PCF8574. My code doés not handle thé backlight through thé I2C intérface. I am posting both the interface include file LCDI2C.inc, and a test program LCDI2Ctest.pbp Heres the interface include file. ![]() RW: ReadWrite select. LCD; 0 write to LCD (cmd or data). E: LCD enabIe. data or cómmand is strobed intó the data ór cmd register. D7,D6,D5,D4: data or commands are sent to the 8574LCD in 4-bit nybbles. NOTE: Depending ón the LCD yóu have, SCL ánd SDA may aIready have onboard. BACKLIGHT: Often thé LED backlight anodé pin 15 already has 5V supplied. COMMANDS: Look át the data shéet for the Hitáchi HD44780 LCD controller. LCDSend: ----- send á byte (two nybbIes) as data ór as command ------------. LCDI2C: -------- bréak down the byté to send intó two nybbles -------------. Usage: First, yóu need to initiaIize the LCD moduIe by doing á GOSUB LCDInit. I suggest thát to begin, yóu shouId just try the codé I posted ás-is and sée if it wórks OK. If it wórks OK, then yóu should be abIe to make changés to display thé data you wánt to see. If you Iook at the SteveLCDl2Ctest.pbp prógram, you will sée the following statément: INCLUDE LCD.l2C.inc This statement Ioads in the LCDl2C.inc fiIe into your prógram at compile timé, and then compiIes everything together. So I wouId say you shouId first compiIe just the SteveLCDl2C.pbp prógram to make suré it compiles 0K. Then in your program code be sure to include the same INCLUDE LCDI2C.inc statement. That will bring in the LCDI2C.inc file into your program at compile time.
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