Description
The following assembler code is from some another project. The parameters of the
procedures are passed through the registers RP0, RP1 and RP2, the return
value is located in the register RRet after the call. These register names
have to be defined before the code can be used. To use this code the file
inttimer16.asm is also required. It contains two delay-routines that are able
put the processor into sleep mode to save power.
The code consists of the following routines and macros:
disp_instruction and disp_data: (macro) Puts the display into data or
instruction mode.
disp_put_byte: Writes a byte to the display. Example:
disp_data
ldi RP0, 'A'
rcall disp_put_byte
ldi RP0, 'B'
rcall disp_put_byte
disp_read_byte: Reads a byte from the display
disp_reset: Resets the display to default values. The contents of the display
are erased and the cursor is moved to the position of the first character.
disp_write_string: Writes a null-terminated string out of program memory to
the display. Example:
CSEG:
string_hello_world:
.db 'H', 'e', 'l', 'l', 'o', ',', ' ', 'w', 'o', 'r', 'l', 'd', '!', 0
ldi RP0, LOW( 2 * string_hello_world )
ldi RP1, HIGH( 2 * string_hello_world )
rcall disp_write_string
