From f8b160eafcdee78ed9b39af432227a978c3f476c Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Sun, 1 Jun 2014 01:17:44 +0000
Subject: added first working support for keypad keys


diff --git a/software/rhmixxx/keypad.c b/software/rhmixxx/keypad.c
index 7362ab4..6e39cc1 100644
--- a/software/rhmixxx/keypad.c
+++ b/software/rhmixxx/keypad.c
@@ -20,36 +20,133 @@
  */
 
 #include <avr/io.h>
+#include <util/delay.h>
 #include "keypad.h"
 
 #define KEYPAD_PIN PINA
 #define KEYPAD_PORT PORTA
 #define KEYPAD_DDR DDRA
 
-#define LEDS_LOW_PORT PORTC
-#define LEDS_LOW_DDR DDRC
-#define LEDS_HIGH_PORT PORTD
-#define LEDS_HIGH_DDR DDRD
+#define KEYPAD_LP_CNT_MAX 200
+static struct key_state_struct {
+  uint8_t last_sent;
+  int16_t lp_cnt;
+} keypad_state[16];
+
 
 void keypad_init(void)
 {
   KEYPAD_DDR = 0x00;
-  KEYPAD_PORT = 0xFF;
+  KEYPAD_PORT = 0x0F;
+  uint8_t i;
+  for(i = 0; i < 16; ++i) {
+    keypad_state[i].last_sent = 0;
+    keypad_state[i].lp_cnt = 0;
+  }
+
+  DDRC = 0xFF;
+  DDRB |= 0xF0;
+  DDRD |= 0xF0;
 
-  LEDS_LOW_DDR = 0xFF;
-  LEDS_LOW_PORT = 0xFF;
-  LEDS_HIGH_DDR = 0xFF;
-  LEDS_HIGH_PORT = 0xFF;
+  PORTC = 0x00;
+  PORTB &= 0x0F;
+  PORTD &= 0x0F;
 }
 
-void keypad_start_led_test(int cnt)
+void keypad_led_on(uint8_t led)
 {
-  LEDS_LOW_PORT = 0x00;
-  LEDS_HIGH_PORT = 0x00;
+  switch(led) {
+    case 0:
+    case 1:
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7: PORTC |= (1 << led); break;
+    case 8:
+    case 9:
+    case 10:
+    case 11: PORTB |= (1 << (led - 8 + 4)); break;
+    case 12:
+    case 13:
+    case 14:
+    case 15: PORTD |= (1 << (led - 12 + 4)); break;
+  }
+}
+
+void keypad_led_off(uint8_t led)
+{
+  switch(led) {
+    case 0:
+    case 1:
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7: PORTC &= ~(1 << led); break;
+    case 8:
+    case 9:
+    case 10:
+    case 11: PORTB &= ~(1 << (led - 8 + 4)); break;
+    case 12:
+    case 13:
+    case 14:
+    case 15: PORTD &= ~(1 << (led - 12 + 4)); break;
+  }
+}
+
+void keypad_led_toggle(uint8_t led)
+{
+  switch(led) {
+    case 0:
+    case 1:
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7: PORTC ^= (1 << led); break;
+    case 8:
+    case 9:
+    case 10:
+    case 11: PORTB ^= (1 << (led - 8 + 4)); break;
+    case 12:
+    case 13:
+    case 14:
+    case 15: PORTD ^= (1 << (led - 12 + 4)); break;
+  }
 }
 
 void keypad_task(void)
 {
-      // TODO: poll keypad matrix for changes (with low pass)
-      //       control led test (if running)
+  uint8_t col, row;
+  for(col = 0; col < 4; ++col) {
+    KEYPAD_DDR = 1 << (col + 4);
+    KEYPAD_PORT = 0x0F;
+    _delay_us(10);
+
+    for(row = 0; row < 4; ++row) {
+      uint8_t key_idx = col*4 + row;
+      uint8_t current_state = KEYPAD_PIN & (1 << row);
+      keypad_state[key_idx].lp_cnt += current_state ? -1 : +1;
+      if(keypad_state[key_idx].lp_cnt <= 0 ||
+         keypad_state[key_idx].lp_cnt >= KEYPAD_LP_CNT_MAX) {
+
+        keypad_state[key_idx].lp_cnt = keypad_state[key_idx].lp_cnt <= 0 ? 0 : KEYPAD_LP_CNT_MAX;
+
+        if(current_state != keypad_state[key_idx].last_sent) {
+          keypad_state[key_idx].last_sent = current_state;
+
+          if(current_state) {
+            keypad_led_off(key_idx);
+          } else {
+            keypad_led_on(key_idx);
+          }
+        }
+      }
+    }
+  }
+  KEYPAD_DDR = 0x00;
 }
diff --git a/software/rhmixxx/keypad.h b/software/rhmixxx/keypad.h
index 6f28b24..14a0a08 100644
--- a/software/rhmixxx/keypad.h
+++ b/software/rhmixxx/keypad.h
@@ -23,7 +23,10 @@
 #define RHMIXXX_keypad_h_INCLUDED
 
 void keypad_init(void);
-void keypad_start_led_test(int cnt);
+
+void keypad_leds_on(uint16_t leds);
+void keypad_leds_off(uint16_t leds);
+void keypad_leds_toggle(uint16_t leds);
 
 void keypad_task(void);
 
-- 
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