Bitmap2lcd Serial Mom
Become a subscriber (Free)Join 29,000 other subscribers to receive subscriber sale discounts andother free resources.Name:E-Mail:Don't worry - youre-mail address is totallysecure. (Your email is safe it willnever be sold or rented).You will get All the C source code andhex file.Note: Check your email for the project code download link.You can recompile the serial LCD files if you want examine code operation(using the built in simulator) or change the source code.
Note the hex file iscontained in the download. Serial LCD Command setAll commands are prefixed with the hash character '#'. Serial port lcd display (RS232 to LCD) circuit diagram(click to open pdf)The circuit simply consists of a PIC micro,interface, an RS232 level translator and an HD44780 LCD. Serial LCD display SoftwareThe software is contained in two files (note there are many more created bythe compiler):16F877A-serial-lcd.cbit.hbit.h contains bit manipulation macros.Project Files16F877A-serial-lcd.mcppiOutput files:serial-lcd.hexFor a tutorial on compiling these files 16F877A-serial-lcd.cInitially a scrolling message is displayed using showintro. When aserial input is detected the main program starts. All keys are now eithertext entry or commands.An infinite loop keeps checking for key input. If the key is a hash symbolthen the command is fetched using:getprefixandexecutecommand(&x,&y);Otherwise the key value is displayed on the LCD at the current cursorposition.Note: the use of x and y addresses(&x,&y) to pass the variable address through to the called functions sothat values of x and y in main are updated (using pointers in the calledfunctions).getprefixandexecutecommand calls executecommand which gets another keyfrom the UART (or waits for one).
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If it matches a valid command then theappropriate code is executed to control the LCD. If not thenUART1ungetchar is used to push the key back.The most interesting commands in executecommand are #X and #Y which usegetandSetX andgetandSetY, again using pointers (this time theaddress & de-reference is not used as px is a pointer that returns itsaddress when invoked).These functions both use get2dignum which gets morecharacters expecting digits - if it does not get them it pushes the key backagain using UART1ungetchar. UART1getchar, UART1ungetcharThese complementary functions are used in parsers (this program is a verysmall parser) where you need to look at the next character of the input to seeif you want to continue. If you don't i.e. Its not the character you wereexpecting then you use UART1ungetchar to put thecurrent character into memory.The function UART1getchar always checks thismemory first before getting a character from its normal input so the systemworks well - but you can only do one unget-char at a time. For more youwould need an array of unget storage etc.The routines let you avoid complicated look ahead algorithms or indexing -you can concentrate on the current character without knowing where an indexis.
Bitmap2lcd Serial Mom And Dad
For a bigger parser you work with complete words. The DW01A chip is a Lithium Ion battery protector commonly used on TP4056 boards.Find out Exactly how it works and how to use it the correct way.For Arduino string operations you can use Object Class Strings or C style strings but which should you use?Also find out how to decode commands and control variables in your programs using strings.Real Time Clock Design (FREE): A Free and Complete RTC design using the DS1307 and a PIC micro (16F88) also re-targetable. This PIC project uses an I2C Clock chip and 7-segment display to create a fou.