160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
#include <LPC17xx.h>
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#define RS_CTRL 0x08000000
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#define EN_CTRL 0x10000000
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#define DT_CTRL 0x07800000
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#define COL_BASE_BIT 15
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#define ROW_BASE_BIT 19
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#define COL_MASK ((0x0F) << COL_BASE_BIT)
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#define ROW_MASK ((0x0F) << ROW_BASE_BIT)
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unsigned long int temp1 = 0, temp2 = 0, i;
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unsigned char flag1 = 0, flag2 = 0;
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unsigned long int init_command[] = {
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0x30, 0x30, 0x30, 0x20, 0x28, 0x0C, 0x01, 0x80
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};
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const unsigned char key_chars[16] = {
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'0','1','2','3','4','5','6','7',
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'8','9','A','B','C','D','E','F'
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};
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void lcd_write(void);
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void port_write(void);
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void delay_lcd(unsigned long);
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void short_delay(volatile unsigned int d);
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void lcd_display_key(unsigned char key);
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int main(void) {
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unsigned int col_idx, row_idx;
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unsigned int candidate = 0xFF;
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unsigned int stable = 0;
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unsigned int displayed = 0xFF;
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unsigned int row_bits;
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LPC_PINCON->PINSEL0 &= ~(0xFFFFFFFF);
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LPC_PINCON->PINSEL1 &= ~(0xFFFFFFFF);
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LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL;
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LPC_GPIO0->FIODIR |= COL_MASK;
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LPC_GPIO0->FIODIR &= ~ROW_MASK;
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LPC_GPIO0->FIOSET = COL_MASK;
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flag1 = 0;
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for (i = 0; i < 8; i++) {
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temp1 = init_command[i];
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lcd_write();
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}
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flag1 = 0;
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temp1 = 0x80;
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lcd_write();
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flag1 = 1;
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temp1 = 'K';
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lcd_write();
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temp1 = 'e';
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lcd_write();
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temp1 = 'y';
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lcd_write();
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temp1 = ':';
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lcd_write();
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temp1 = ' ';
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lcd_write();
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for(;;) {
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unsigned int read_key = 0xFF;
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for(col_idx = 0; col_idx < 4; col_idx++) {
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LPC_GPIO0->FIOSET = COL_MASK;
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short_delay(50);
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LPC_GPIO0->FIOCLR = (1 << (COL_BASE_BIT + col_idx));
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short_delay(200);
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row_bits = (LPC_GPIO0->FIOPIN & ROW_MASK) >> ROW_BASE_BIT;
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if(row_bits != 0x0F) {
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for(row_idx = 0; row_idx < 4; row_idx++) {
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if((row_bits & (1 << row_idx)) == 0) {
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read_key = col_idx * 4 + row_idx;
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break;
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}
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}
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LPC_GPIO0->FIOSET = COL_MASK;
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break;
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}
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LPC_GPIO0->FIOSET = COL_MASK;
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}
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if(read_key == candidate) {
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if(stable < 3) stable++;
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} else {
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candidate = read_key;
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stable = 1;
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}
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if(stable >= 3) {
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if(candidate != 0xFF && candidate != displayed) {
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displayed = candidate;
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lcd_display_key(displayed);
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}
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stable = 3;
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}
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short_delay(3000);
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}
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}
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void lcd_display_key(unsigned char key) {
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flag1 = 0;
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temp1 = 0x85;
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lcd_write();
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flag1 = 1;
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temp1 = key_chars[key];
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lcd_write();
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}
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void short_delay(volatile unsigned int d) {
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while(d--) __NOP();
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}
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void lcd_write(void) {
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flag2 = (flag1 == 1) ? 0 :
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(((temp1 == 0x30) || (temp1 == 0x20)) ? 1 : 0);
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temp2 = temp1 & 0xf0;
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temp2 = temp2 << 19;
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port_write();
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if (!flag2) {
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temp2 = temp1 & 0x0f;
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temp2 = temp2 << 23;
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port_write();
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}
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}
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void port_write(void) {
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LPC_GPIO0->FIOPIN = temp2;
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if (flag1 == 0) {
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LPC_GPIO0->FIOCLR = RS_CTRL;
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} else {
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LPC_GPIO0->FIOSET = RS_CTRL;
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}
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LPC_GPIO0->FIOSET = EN_CTRL;
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delay_lcd(100);
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LPC_GPIO0->FIOCLR = EN_CTRL;
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delay_lcd(500000);
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}
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void delay_lcd(unsigned long r1) {
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unsigned long r;
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for (r = 0; r < r1; r++);
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return;
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}
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