HTEB1
User manual
3.2 LCD
One of the highlights of the HTEB1 is the 2*16 character LCD with backlight. Simple functions are provided here to demonstrate the usage of the LCD. Please refer to the LCD manual for further information (e.g. commands, other character sets etc.).
The demo source contains some definitions to reset and initialise the display. Then we make some simple write outs.
**LCDDemo shows some funcions of the LCD on the TinyEvalBoard
**Please refer to LCD datasheet for further details
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#include "mydefs.h" |
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| // find further includes there! |
void wait(u16 wastetime) | // local LCD port delay | ||
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} |
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/* |
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RS = P75, R/W | = P74, | EN | = P20, DATA = P5 |
*/ |
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//some defines for easy access #define CLEAR_LCD_RS (PDR7 &= ~0x20)
#define SET_LCD_RS |
| (PDR7 = 0x20) |
#define CLEAR_LCD_RW | (PDR7 &= ~0x10) | |
#define SET_LCD_RW |
| (PDR7 = 0x10) |
#define CLEAR_LCD_EN | (PDR2 &= ~0x01) | |
#define SET_LCD_EN |
| (PDR2 = 0x01) |
#define LCD_DATA_PORT (PDR5) |
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#define LCD_DATA_CTRL (PCR5) |
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#define LCD_OUT | 0xff |
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#define LCD_IN 0x00 |
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#define LCD_WAIT |
| {wait(100);} |
void LCDWriteCmd(u8 cmd) | // write cmd to LCD port | |
{ |
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CLEAR_LCD_RS; |
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CLEAR_LCD_RW; |
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SET_LCD_EN; |
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LCD_DATA_PORT = cmd; |
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LCD_WAIT; |
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CLEAR_LCD_EN; |
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LCD_WAIT; |
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} |
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void LCDWriteData(u8 data) | // write data to LCD port | |
{ |
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SET_LCD_RS; |
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CLEAR_LCD_RW; SET_LCD_EN; LCD_DATA_PORT = data; LCD_WAIT; CLEAR_LCD_EN; LCD_WAIT;
}
Issue 0.2 | Page 36 | 07/2002 |
