polprog / stm8-hd44780 Goto Github PK
View Code? Open in Web Editor NEWSmall and simple HD44780 LCD controller library
License: BSD 3-Clause "New" or "Revised" License
stm8-hd44780's Introduction
Simple small HD44780 LCD library for STM8 Files: ===== main.c - test and demo delay.h - delay functions hd44780.c - implementation hd44780.h - header readme - this file COPYING - licence Example compilation: ===== $ make clean && make && make flash flash target assumes you are using stlinkv2 programmer. Should you use another version, modify the Makefile to your needs. The example should print a message to the display. Tested on STM8S-DISCOVERY dev kit. Connections: Connections are redefinable as long as the whole data bus is on the same port. This was chosen to make the code more compact and smaller. E - PD0 RS - PD1 D4-D7 - PD2-5 Usage: ===== Include hd44780.h and delay.h in your code, add the c file to the build path. Define F_CPU_K as CPU speed in KHz. Note that in this project the macro is defined in the Makefile! delay.h contains LibC-AVR style functions _delay_ms() and _delay_cycl(), and a macro _delay_us(). All three let you use a variable as a parameter, in contrary to LibC-AVR. I found sdcc can do *weird things* with those so always check the corresponding .asm file. A badly expanded macro may result in calls to word mul and div, which take extra amount of time! Happy hacking!
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vult0306stm8-hd44780's Issues
Fix possibly bad behavior when the cmd parameter of lcd_send_byte > 1
Line 34 in c5018bd
Not ANDing cmd with 0x01 causes higher bits to be overwritten if cmd != 0 or 1
Clean up test expressions
` uint8_t a = 98;
PB_DDR = 0xFF;
PB_CR1 = 0xFF;`
Those are test lines that were left by me when testing SDCC code generation, they aren't necesary here.
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