68 lines
1.3 KiB
Markdown
68 lines
1.3 KiB
Markdown
# AVR_ATMEGA_1602LCD
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A small library/program for using the 1602 LCD display in 4 bit mode.
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## Hardware:
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- LCD 1602 ADM1602K-NSW-FBS-3.3v or ADM1602K-NSW-FBS-5.0v
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- AVR Micro-controller
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## Supported Controllers:
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List of supported controllers:
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___
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- ATMega48
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- ATMega88
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- ATMega168
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- ATMega328
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___
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## Usage:
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```C
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#include "AVR_ATMEGA_1602LCD.h"
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void do_stuff() {
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PORTD = 0x00;
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DDRD = 0xff;
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init_lcd();
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return_home_lcd();
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set_entry_mode_increment_lcd();
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//Refernce the datasheet for charecter codes.
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write_lcd_address(0x7f); //Right pointing arrow
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//wait a bit.
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_delay_ms(1000);
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//clear it up
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clear_lcd();
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return_home_lcd();
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//Do more stuff...
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}
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```
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## RoadMap:
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4. ADD function to print strings
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5. ADD function to display bit images
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6. ADD function to act as a loading screen.
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7. ADD animations
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8. ADD PWM control for contrast
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9. ADD PWM control for backlight
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## ISSUES:
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Currently during powerloss events and initialization, long wire runs or
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residual charge can cause the LCD to maintain memory for a short duration.
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In 4bit mode it's possible to end up with a invalid "nibble" in the LCD memory
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in this case the system should power cycle the LCD unit assuming it's
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controlled by the microcontroller.
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