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8051 Code Library
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| ROUTINE | CONTRIBUTOR | DESCRIPTION |
| Multiple DPTRs | Reg Drake | Allows a program to operate as if it had multiple DPTRs, even on a standard 8051 that has only a single DPTR. |
| BUTTONS | Dave Fletcher | Detects state changes and performs debounce for push buttons. |
| DEC_DPTR | VIS | Performs the opposite of INC DPTR; it decrements DPTR by 1. |
| BCD_BYTE | VIS | Short function which converts a single 8-bit value into two BCD digits, and another function which does the reverse. |
| LCD DISPLAY | John Wren | A number of functions which initialize a standard Hitachi HD44100/HD44780 LCD display and allows a program to write commands and/or straight text to the display. |
| CRC-8 CALCULATIONS | John Wren | A CCITT-8 CRC calculator. The source contains both the calculated (smaller but slower) version, and the table driven (faster but larger) version. |
| CRC-16 CALCULATIONS | John Wren | A CCITT-16 CRC calculator. The source contains both the calculated (smaller but slower) version, and the table driven (faster but larger) version. |
| AUTOBAUD DETECTION | John Wren | A routine that will autobaud on the serial port. It will handle 150 to 19200 baud, and 38400 can be added easily by modifying the table. |
| AUTOBAUD DETECTION | John Wren | A routine that will autobaud on the serial port. It will handle 150 to 19200 baud, and 38400 can be added easily by modifying the table. |
| VARIOUS UTILITY FUNCTIONS | John Wren | UTIL_ADCAD - Add Acc to DPTR, sets
CY UTIL_ADCBAD - Add B/A to DPTR, sets CY UTIL_SUBBAD - Subtracts Acc from DPTR, sets CY UTIL_SUBBBAD - Subtracts B/A from DTPR, sets CY UTIL_INC16 - Increments 16 bit location in IRAM UTIL_UCOMPARE16 - Compares DPTR to 16 bit IRAM value UTIL_UCMPDPTRBA - Compares DPTR to B/A UTIL_SHIFT4L - Shfts a 16 bit IRAM value 4 bits left UTIL_LDDPTRC - Load DPTR from (DPTR) ROM UTIL_LDDPTRD - Load DPTR from (DPTR) XRAM UTIL_STDPTRD - Store R6/7 to (DPTR) XRAM UTIL_DPTRR01 - Exchange R0/1 <-> DPTR UTIL_DPTRR67 - Exchange R6/7 <-> DPTR UTIL_DPTR2C - 2s complelment DPTR UTIL_DPTRDEC - DPTR = DPTR - 1, sets CY UTIL_DPTRASR1 - Arithmetic shift right DPTR UTIL_DPTRSHR1 - Shift DPTR right UTIL_DPTRROL4 - Rotate DPTR left 4 UTIL_DPTRSHL4 - Shift DPTR left UTIL_R3R7RL4 - Shift R3/4/5/6/7 4 bits left UTIL_DPTRX10 - DPTR = DPTR * 10 UTIL_DPTRX100 - DPTR = DPTR * 100 UTIL_DPTRX1000 - DPTR = DPTR * 1000 UTIL_CALLFUNC - Call function DPTR points to UTIL_TOLOWER - Convert Acc to lowercase UTIL_TOUPPER - Convert Acc to uppercase UTIL_HEXTOBIN - Convert ACSII hex to binary UTIL_DECTOBIN - Convert ASCII decimal to binary UTIL_BCDTOBIN - Convert BCD to binary UTIL_ASC36TOBIN - Convert base 36 value to binary UTIL_BINTOASC - Convert binary to ASCII UTIL_BINTOASC36 - Convert binary to ASCII base 36 UTIL_BINTOBCD - Convert 8 bit binary to BCD UTIL_BINTOBCD12 - Convert 12 bit binary to BCD UTIL_BINTODEC - Convert DPTR to signed string UTIL_BINTOUDEC - Convert DPTR to unsigned string UTIL_VALDCDG - Validate Acc for ASCII decimal UTIL_VALHXDG - Validate Acc for ASCII hex UTIL_VALALPHA - Validate Acc for A..Z, a..z, 0..9 UTIL_VALALPHAZ - Validate string for A..Z, a..z, 0..9 UTIL_CNTDG - Count ASCII decimal in string UTIL_UDIV - Unsigned divide UTIL_UMOD - Unsigned mod UTIL_DIV - Signed divide UTIL_MOD - Signed mod UTIL_COPYXTOI - Copy XRAM to IRAM, length UTIL_COPYITOX - Copy IRAM to XRAM, length UTIL_COPYCTODL - Copy ROM to XRAM, length UTIL_COPYCTODZ - Copy ROM to XRAM, string UTIL_COPYDTODL - Copy XRAM to XRAM, length UTIL_COPYDTODZ - Copy XRAM to XRAM, string UTIL_PUT_ETX - Replace 0x00 with ETX in string UTIL_FIND_ETX - Locate ETX in string UTIL_TRIM - Remove trailing spaces UTIL_STRLEN - Return length of string |
If you have code--large, small, simple, or complicated--that you believe would be of interest to other 8052 developers and you'd like to share it, please email it to us so that we may include it in our code library. You will receive full credit for the code you submit and we'll even include a link from the description (below) to your home page so that after they see your code in action they can immediately check out your site.