add schematic pdfs and firmware code

Code/devterm_keyboard/keys.ino

@@ -0,0 +1,115 @@
+#include "keys.h"
+
+static bool key_debouncing = false;
+static uint16_t key_debouncing_time = 0;
+
+uint8_t keys_io[ KEYS_NUM ]= {KEY1,KEY2,KEY3,KEY4,KEY5,KEY6,KEY7,KEY8,KEY9,KEY10,KEY11,KEY12,KEY13,KEY14,KEY15,KEY16};
+
+/* keys state(1:on, 0:off) */
+static uint16_t keys;
+static uint16_t keys_debouncing;
+static uint16_t keys_prev;
+
+
+static int8_t keys_jack_idx=-1;
+static uint16_t keys_jack_time = 0;
+
+void init_keys(){
+  int i;
+  for(i=0;i<KEYS_NUM;i++) {
+    pinMode( keys_io[i],INPUT_PULLUP);  
+  }
+}
+
+uint8_t scan_keys(){
+  uint16_t data;
+  uint8_t s;
+  
+  data = 0;
+  delayMicroseconds(20);
+  for(int i = 0;i < KEYS_NUM;i++) {
+    
+    s = digitalRead(keys_io[i]); //HIGH =0,LOW = 1
+    if( s == LOW ){
+      data |= 1 << i;
+    }else {
+      data |= 0 << i;
+    }
+  }
+  
+  if ( keys_debouncing != data ) {
+      keys_debouncing = data;
+      key_debouncing = true;
+      key_debouncing_time = millis();
+  }
+
+   if (key_debouncing == true  &&  ( (millis() - key_debouncing_time) > KEY_DEBOUNCE )) {
+    keys = keys_debouncing;
+    debouncing = false;
+  }
+
+  return 1;
+}
+
+
+void print_keys(DEVTERM*dv) {
+  char buff[128];
+
+  for (int i = 0; i < KEYS_NUM; i++) {
+    if( keys & (1<< i) ){
+      sprintf(buff,"B%d pressed\n",i+1);
+      dv->_Serial->print(buff);
+    }
+  }
+  
+  
+}
+
+void keys_task(DEVTERM*dv){
+
+  uint16_t _change = 0;
+
+  scan_keys();
+
+  uint16_t _mask =1;
+  for(uint8_t c=0;c < KEYS_NUM;c++,_mask <<=1){
+
+    if( (keys_prev & _mask) == 0 && (keys & _mask) > 0){
+      keypad_action(dv,c,KEY_PRESSED);
+    }
+    if( (keys_prev & _mask) > 0 && (keys & _mask) == 0){
+      keypad_action(dv,c,KEY_RELEASED);
+    }
+    
+    if( (keys_prev & _mask) > 0 && (keys & _mask) > 0) { ////same key
+
+      if( c >= 0 && c < 4) {// only allow B1-B4 
+        if( keys_jack_idx == -1){
+          keys_jack_idx = c;
+        }else{
+          if(keys_jack_idx != c) {
+            keys_jack_time = 0;
+            keys_jack_idx = c;
+          }else{              
+            keys_jack_time +=1;
+            if( keys_jack_time % (KEY_DEBOUNCE*20) == 0){
+              keypad_action(dv,c,KEY_PRESSED);
+            } 
+          }
+        }
+      }
+    }
+  }
+
+  keys_prev = keys;
+ 
+}
+
+void keys_init(DEVTERM*dv){
+
+  init_keys();
+  //center the position
+  dv->Joystick->X(511);
+  dv->Joystick->Y(511);
+  
+}