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145 lines
2.9 KiB
145 lines
2.9 KiB
14 years ago
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/*
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* scan matrix
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*/
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#include <avr/io.h>
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#include <util/delay.h>
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#include "keymap.h"
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#include "matrix.h"
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#include "print.h"
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uint8_t *matrix;
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uint8_t *prev_matrix;
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static uint8_t _matrix0[MATRIX_ROWS];
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static uint8_t _matrix1[MATRIX_ROWS];
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static uint8_t read_col(void);
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static void select_row(uint8_t row);
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void matrix_init(void)
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{
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// Column: input w/pullup
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DDRB = 0x00;
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PORTB = 0xFF;
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// Row: Hi-Z(unselected)
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// PD:0,1,2,3,6,7
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// PC:6,7
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// PF:7
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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for (int i=0; i < MATRIX_ROWS; i++) {
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_matrix0[i] = 0xFF;
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_matrix1[i] = 0xFF;
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}
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matrix = _matrix0;
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prev_matrix = _matrix1;
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}
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uint8_t matrix_scan(void)
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{
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uint8_t row, state;
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uint8_t *tmp;
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tmp = prev_matrix;
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prev_matrix = matrix;
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matrix = tmp;
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for (row = 0; row < MATRIX_ROWS; row++) {
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select_row(row);
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_delay_us(30); // without this wait read unstable value.
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state = read_col();
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matrix[row] = state;
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}
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return 1;
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}
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static uint8_t read_col(void)
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{
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return PINB;
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}
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static void select_row(uint8_t row)
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{
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switch (row) {
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case 0:
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DDRD = (1<<0);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 1:
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DDRD = (1<<1);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 2:
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DDRD = (1<<2);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 3:
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DDRD = (1<<3);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 4:
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DDRD = (1<<6);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 5:
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DDRD = (1<<7);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 6:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = (1<<6);
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 7:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = (1<<7);
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 8:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = (1<<7);
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PORTF = 0x00;
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break;
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}
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}
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