At-Keyboard-Interface - Hitachi Network Adapter H8 User Manual

HTEB1
User manual

3.5 AT-Keyboard-Interface

This demo shows the usage of the PS2 (mini-DIN) interface on HTEB1.
Please connect an AT-keyboard (MF102) to this port. You will see the
keycodes, provided by the keyboard on the LCD. Please refer to the code
table for keycode translation in your own projects.
/*------------------------------------------------------------------
** AT-Keyb shows the PS2-Interface to an AT-Keyboard
**-----------------------------------------------------------------*/
#include "mydefs.h"
void wait(u16 wastetime)
{
while(wastetime--);
}
/*
LCD-Port / Bits on TinyEvalBoard
RS = P75, R/W
*/
// some defines for easy access
#define CLEAR_LCD_RS
#define SET_LCD_RS
#define CLEAR_LCD_RW
#define SET_LCD_RW
#define CLEAR_LCD_EN
#define SET_LCD_EN
#define LCD_DATA_PORT (PDR5)
#define LCD_DATA_CTRL (PCR5)
#define LCD_OUT
#define LCD_IN 0x00
#define LCD_WAIT
void LCDWriteCmd(u8 cmd)
{
CLEAR_LCD_RS;
CLEAR_LCD_RW;
SET_LCD_EN;
LCD_DATA_PORT = cmd;
LCD_WAIT;
CLEAR_LCD_EN;
LCD_WAIT;
}
void LCDWriteData(u8 data)
{
SET_LCD_RS;
CLEAR_LCD_RW;
SET_LCD_EN;
LCD_DATA_PORT = data;
LCD_WAIT;
CLEAR_LCD_EN;
LCD_WAIT;
}
u8 LCDReadStatus(void)
{
u8 status;
CLEAR_LCD_RS;
Issue 0.2
// with further includes!
// local LCD port delay
= P74, EN = P20, DATA = P5
(PDR7 &= ~0x20)
(PDR7 |= 0x20)
(PDR7 &= ~0x10)
(PDR7 |= 0x10)
(PDR2 &= ~0x01)
(PDR2 |= 0x01)
0xff
{wait(100);}
// write cmd to LCD port
// write data to LCD port
// get the LCD status register
Page 44 07/2002