[Keyboard] Bathroom Epiphanies Frosty Flake rev 20130602 (#15365)

* add optional support for Frosty Flake rev 20130602

* update documentation with instructions on building for rev 20130602

* support revisions using subfolders instead of preprocessor directives

* rules.mk cleanup

3 files changed, 132 insertions, 0 deletions

diff --git a/keyboards/bpiphany/frosty_flake/20140521/20140521.c b/keyboards/bpiphany/frosty_flake/20140521/20140521.c
new file mode 100644
index 0000000000..cd425cffa1
--- /dev/null
+++ b/keyboards/bpiphany/frosty_flake/20140521/20140521.c
@@ -0,0 +1,24 @@
+#include "frosty_flake.h"
+
+void keyboard_pre_init_kb() {
+    setPinOutput(B7); // num lock
+    writePinHigh(B7);
+    setPinOutput(C5); // caps lock
+    writePinHigh(C7);
+    setPinOutput(C6); // scroll lock
+    writePinHigh(C6);
+
+    keyboard_pre_init_user();
+}
+
+bool led_update_kb(led_t usb_led) {
+    // user requests no further processing
+    if (!led_update_user(usb_led))
+        return true;
+
+    writePin(B7, !usb_led.caps_lock);
+    writePin(C5, !usb_led.num_lock);
+    writePin(C6, !usb_led.scroll_lock);
+
+    return true;
+}
diff --git a/keyboards/bpiphany/frosty_flake/20140521/matrix.c b/keyboards/bpiphany/frosty_flake/20140521/matrix.c
new file mode 100644
index 0000000000..24c7617b19
--- /dev/null
+++ b/keyboards/bpiphany/frosty_flake/20140521/matrix.c
@@ -0,0 +1,86 @@
+/*
+  Copyright 2017 Gabriel Young <gabeplaysdrums@live.com>
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <util/delay.h>
+#include "matrix.h"
+
+
+static matrix_row_t scan_col(void) {
+    // Each of the 8 columns is read off pins as below
+    //   7  6  5  4  3  2  1  0
+    // ,--,--,--,--,--,--,--,--,
+    // |B0|B3|B2|B1|B6|B4|B5|C7|
+    // `--`--`--`--`--`--`--`--`
+    return (
+        (PINC&(1<<7) ? 0 : ((matrix_row_t)1<<0)) |
+        (PINB&(1<<5) ? 0 : ((matrix_row_t)1<<1)) |
+        (PINB&(1<<4) ? 0 : ((matrix_row_t)1<<2)) |
+        (PINB&(1<<6) ? 0 : ((matrix_row_t)1<<3)) |
+        (PINB&(1<<1) ? 0 : ((matrix_row_t)1<<4)) |
+        (PINB&(1<<2) ? 0 : ((matrix_row_t)1<<5)) |
+        (PINB&(1<<3) ? 0 : ((matrix_row_t)1<<6)) |
+        (PINB&(1<<0) ? 0 : ((matrix_row_t)1<<7))
+    );
+}
+
+static void select_row(uint8_t row) {
+    switch (row) {
+        case  0: PORTD = (PORTD & ~0b01111011) | 0b00011011; break;
+        case  1: PORTD = (PORTD & ~0b01111011) | 0b01000011; break;
+        case  2: PORTD = (PORTD & ~0b01111011) | 0b01101010; break;
+        case  3: PORTD = (PORTD & ~0b01111011) | 0b01111001; break;
+        case  4: PORTD = (PORTD & ~0b01111011) | 0b01100010; break;
+        case  5: PORTD = (PORTD & ~0b01111011) | 0b01110001; break;
+        case  6: PORTD = (PORTD & ~0b01111011) | 0b01100001; break;
+        case  7: PORTD = (PORTD & ~0b01111011) | 0b01110000; break;
+        case  8: PORTD = (PORTD & ~0b01111011) | 0b01100000; break;
+        case  9: PORTD = (PORTD & ~0b01111011) | 0b01101000; break;
+        case 10: PORTD = (PORTD & ~0b01111011) | 0b00101011; break;
+        case 11: PORTD = (PORTD & ~0b01111011) | 0b00110011; break;
+        case 12: PORTD = (PORTD & ~0b01111011) | 0b00100011; break;
+        case 13: PORTD = (PORTD & ~0b01111011) | 0b01111000; break;
+        case 14: PORTD = (PORTD & ~0b01111011) | 0b00010011; break;
+        case 15: PORTD = (PORTD & ~0b01111011) | 0b01101001; break;
+        case 16: PORTD = (PORTD & ~0b01111011) | 0b00001011; break;
+        case 17: PORTD = (PORTD & ~0b01111011) | 0b00111011; break;
+    }
+}
+
+void matrix_init_custom(void) {
+    /* Row output pins */
+    DDRD  |=  0b01111011;
+    /* Column input pins */
+    DDRC  &= ~0b10000000;
+    DDRB  &= ~0b01111111;
+    PORTC |=  0b10000000;
+    PORTB |=  0b01111111;
+}
+
+// matrix is 18 uint8_t.
+// we select the row (one of 18), then read the column
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+	bool has_changed = false;
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        matrix_row_t orig = current_matrix[row];
+        select_row(row);
+        _delay_us(3);
+        current_matrix[row] = scan_col();
+        has_changed |= (orig != current_matrix[row]);
+    }
+
+    return has_changed;
+}
diff --git a/keyboards/bpiphany/frosty_flake/20140521/rules.mk b/keyboards/bpiphany/frosty_flake/20140521/rules.mk
new file mode 100644
index 0000000000..035e59f911
--- /dev/null
+++ b/keyboards/bpiphany/frosty_flake/20140521/rules.mk
@@ -0,0 +1,22 @@
+# MCU name
+MCU = atmega32u2
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no        # Console for debug
+COMMAND_ENABLE = no        # Commands for debug and configuration
+NKRO_ENABLE = no            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+AUDIO_ENABLE = no           # Audio output
+
+CUSTOM_MATRIX = lite
+SRC += 20140521/matrix.c
+
+LAYOUTS = tkl_ansi