// ============================================================================
// Motorola 68HC11
// Example Keypad and LCD display drivers
//
// For use with the Axiom CMD11 development board
// Compiled with Imagecraft C Compiler
//
// To execute under buffalo, type load t, upload the s19 file then type
// go 2440. This is the beginning of the main() function for this program
// as compiled. If you re-compile it, look in the .mp file to locate main().
//
// ============================================================================
#include <hc11.h>
#define LINE_1 0x80 // beginning position of LCD line 1
#define LINE_2 0xC0 // beginning position of LCD line 2
#define LINE_3 0x94 // beginning position of LCD line 3
#define LINE_4 0xD4 // beginning position of LCD line 4
#define DELAY1MS 73 // number of loops = 1ms
// I/O Port Addresses
#define LCD_CMD *(unsigned char *)(_IO_BASE + 0xA5F0)
#define LCD_DAT *(unsigned char *)(_IO_BASE + 0xA5F1)
#define AUX_A *(unsigned char *)(_IO_BASE + 0xA5F4)
#define AUX_C *(unsigned char *)(_IO_BASE + 0xA5F6)
#define AUX_CON *(unsigned char *)(_IO_BASE + 0xA5F7)
// Function Prototypes
void InitKey();
char kbhit();
char getkey();
void LCD_Command(unsigned char cval);
void LCD_busy(void);
void cprint(char dval);
void LCDprint(char *sptr);
void delay100ms(unsigned int secs);
void delay1ms(unsigned int msecs);
// Global Variables
unsigned char NewKey, LastKey, testval; // global variables used by keypad
unsigned char colcount, colval, rowval, keybuf;
main(){
DDRD = 0x3F; // set keypad I/O data direction register
NewKey = 0; // reset key variables
LastKey = 0xFF;
// Initialize the LCD
LCD_Command(0x3C); // initialize command
LCD_Command(0x0C); // display on, cursor off
LCD_Command(0x06);
LCD_Command(0x01);
// Display Header Information on LCD
LCD_Command(LINE_1); // goto lcd line 1
LCDprint("Keypad Test");
LCD_Command(LINE_2); // goto lcd line 2
LCDprint("Press Keys");
LCD_Command(LINE_3); // goto lcd line 3
// main loop .. endless
for( ; ;){
if(kbhit()){ // if new key pressed
cprint(NewKey); // display it
}
}
}
// Wait for the LCD busy pin to clear
void LCD_busy(){
while ((LCD_CMD & 0x80)) ;
}
void LCD_Command(unsigned char cval){
//unsigned char cval;
LCD_busy(); // wait for busy to clear
LCD_CMD = cval; // ouptut command
}
//* LCD Display Character
void cprint(char dval){
LCD_busy(); // wait for busy to clear
LCD_DAT = dval; // ouptut data
}
// LCD Display String
void LCDprint(char *sptr){
while( *sptr ){
cprint(*sptr);
++sptr;
}
}
// Busy wait loop to generate a delay multiple of 1ms
void delay1ms(unsigned int msecs) {
unsigned int i,j;
if (msecs > 0) {
for (j=0; j<=msecs; j++)
for (i=0; i<DELAY1MS; i++);
}
return;
}
// Busy wait loop to generate a delay multiple of 100ms.
void delay100ms(unsigned int secs){
unsigned int i,j;
if (secs > 0) {
for (j=0; j<=secs; j++)
for (i=0; i<100; i++) delay1ms(1);
}
}
// initialize keyports, prepare for keyscan
void InitKey(){
AUX_CON=0x8B; // cycle port
AUX_A=0xFF; // force A high
AUX_CON=0x93; // AUX PortC 4-7 = Out, AUX PortA = IN
AUX_C=0xFF; // Key columns High on Port C
}
// returns 1 if a key is pressed.
// the key value/index is stored in the global variable NewKey.
char kbhit(){
unsigned char KeyDATA[] =
{'D','#','0','*','C','9','8','7','B','6','5','4','A','3','2','1'};
InitKey(); /* INITIALIZE KEYSCAN*/
delay1ms(10); /* wait 10ms*/
/* do quick keyscan of all rows */
AUX_C = 0x0F;
testval = AUX_A;
if((testval ^ 0xFF) == 0){
LastKey = 0xFF;
return 0;
}
if(LastKey != 0xFF){ // if same key still pressed
return 0;
}
keybuf = 0;
for(colcount=0x80; colcount > 0x0F; colcount = colcount >> 1){
colval = colcount ^ 0xFF;
AUX_C = colval;
rowval = AUX_A;
rowval = rowval ^ 0xFF;
if(rowval != 0) break;
keybuf += 4;
}
if(rowval == 0) return 0;
testval = AUX_A;
colcount=0x80;
for( ; ;){
if((testval & colcount) == 0){ /* if this row pressed*/
InitKey(); /* INITIALIZE KEYSCAN*/
NewKey = KeyDATA[keybuf];
LastKey = NewKey;
return(1);
}
++keybuf;
colcount >>= 1; /* rotate to check next row */
if(colcount == 0x08) break;
}
InitKey(); /* INITIALIZE KEYSCAN*/
return 0; /* return no key pressed*/
}
char dosomething(){
return 0;
}
// waits for a key press and returns it
char getkey(){
while( !kbhit()){ // wait for key press
dosomething();
}
return(NewKey);
}