everything works!

keyboards/teensy_lc_synth/keymaps/default/keymap.c

@@ -22,4 +22,10 @@ const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
            KC_1, KC_2,       KC_3, KC_4, KC_5, \
         KC_C, KC_D, KC_E, KC_F, KC_G, KC_A, KC_B \
     )
+/*
+    KEYMAP(
+           KC_NO, KC_NO,       KC_NO, KC_NO, KC_NO, \
+        KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO \
+    )
+*/
 };

keyboards/teensy_lc_synth/matrix.c

@@ -81,7 +81,6 @@ uint8_t matrix_scan(void) {
         select_row(i);
         wait_us(30);  // without this wait read unstable value.
         matrix_row_t cols = read_cols();
-        printf("row:%d cols:%d\n", i, cols);
         if (matrix_debouncing[i] != cols) {
             matrix_debouncing[i] = cols;
             if (debouncing) {
@@ -102,9 +101,6 @@ uint8_t matrix_scan(void) {
         }
     }
 
-    print("\n"); // FIXME: only here for debugging
-    wait_ms(1000); // FIXME: only here for debugging
-
     return 1;
 }
 
@@ -131,23 +127,18 @@ void matrix_print(void) {
  */
 static void init_cols(void) {
     // Set columns to input mode so they can be read.
-    palSetPadMode(TEENSY_PIN14_IOPORT, TEENSY_PIN14, PAL_MODE_INPUT);
+    palSetPadMode(TEENSY_PIN14_IOPORT, TEENSY_PIN14, PAL_MODE_INPUT_PULLDOWN);
-    palSetPadMode(TEENSY_PIN15_IOPORT, TEENSY_PIN15, PAL_MODE_INPUT);
+    palSetPadMode(TEENSY_PIN15_IOPORT, TEENSY_PIN15, PAL_MODE_INPUT_PULLDOWN);
-    palSetPadMode(TEENSY_PIN16_IOPORT, TEENSY_PIN16, PAL_MODE_INPUT);
+    palSetPadMode(TEENSY_PIN16_IOPORT, TEENSY_PIN16, PAL_MODE_INPUT_PULLDOWN);
-    palSetPadMode(TEENSY_PIN11_IOPORT, TEENSY_PIN11, PAL_MODE_INPUT);
+    palSetPadMode(TEENSY_PIN11_IOPORT, TEENSY_PIN11, PAL_MODE_INPUT_PULLDOWN);
 }
 
 /* Returns status of switches(1:on, 0:off) */
 static matrix_row_t read_cols(void) {
-    printf("pin14:%d, ", (palReadPad(TEENSY_PIN14_IOPORT, TEENSY_PIN14)==PAL_LOW)<<0);
+    return ((palReadPad(TEENSY_PIN14_IOPORT, TEENSY_PIN14)==PAL_LOW) ? 0 : (1<<0)) |
-    printf("pin15:%d, ", (palReadPad(TEENSY_PIN15_IOPORT, TEENSY_PIN15)==PAL_LOW)<<1);
+        ((palReadPad(TEENSY_PIN15_IOPORT, TEENSY_PIN15)==PAL_LOW) ? 0 : (1<<1)) |
-    printf("pin16:%d, ", (palReadPad(TEENSY_PIN16_IOPORT, TEENSY_PIN16)==PAL_LOW)<<2);
+        ((palReadPad(TEENSY_PIN16_IOPORT, TEENSY_PIN16)==PAL_LOW) ? 0 : (1<<2)) |
-    printf("pin11:%d\n", (palReadPad(TEENSY_PIN11_IOPORT, TEENSY_PIN11)==PAL_LOW)<<3);
+        ((palReadPad(TEENSY_PIN11_IOPORT, TEENSY_PIN11)==PAL_LOW) ? 0 : (1<<3));
-    
-    return (palReadPad(TEENSY_PIN14_IOPORT, TEENSY_PIN14)==PAL_LOW) ? 0 : (1<<0) ||
-        (palReadPad(TEENSY_PIN15_IOPORT, TEENSY_PIN15)==PAL_LOW) ? 0 : (1<<1) ||
-        (palReadPad(TEENSY_PIN16_IOPORT, TEENSY_PIN16)==PAL_LOW) ? 0 : (1<<2) ||
-        (palReadPad(TEENSY_PIN11_IOPORT, TEENSY_PIN11)==PAL_LOW) ? 0 : (1<<3);
 }
 
 /* Row pin configuration
@@ -164,15 +155,12 @@ static void select_row(uint8_t row) {
     // Output high to select
     switch (row) {
         case 0:
-            print("Row 1: ");
             palSetPad(TEENSY_PIN13_IOPORT, TEENSY_PIN13);
             break;
         case 1:
-            print("Row 2: ");
             palSetPad(TEENSY_PIN12_IOPORT, TEENSY_PIN12);
             break;
         case 2:
-            print("Row 3: ");
             palSetPad(TEENSY_PIN18_IOPORT, TEENSY_PIN18);
             break;
     }