[Keyboard] Pearl Refactors (#5907)

* use pragma once

* remove custom matrix

* remove custom i2c code in favor of QMK's i2c_master

* rename to all lower case readme

* update readme

* turn off bootmagic as it doesn't work anyway

* Update keyboards/pearl/readme.md

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

10 files changed, 102 insertions, 356 deletions

diff --git a/keyboards/pearl/README.md b/keyboards/pearl/README.md
deleted file mode 100644
index ec54ba80f..000000000
--- a/keyboards/pearl/README.md
+++ /dev/null
@@ -1,85 +0,0 @@
-# Pearl 40%
-
-Pearl 40% is a keyboard designed by Koobaczech. It uses an Atmel
-ATMEGA32A MCU.
-
-## Compiling and flashing
-
-These instructions are for building and flashing your Pearl 40% without
-Bootmapper Client.
-
-### Requirements
-
-#### Windows
-
-(to be written, help needed)
-
-#### Mac
-
-Apart from regular QMK and AVR dependencies you need to install
-`bootloadHID`. You can install it with `homebrew` as follows:
-
-    $ brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
-
-If you don't use `homebrew` you can try following the compiling
-instructions defined below in the Linux section.
-
-#### Linux
-
-For Linux you require all regular QMK dependencies, but make sure you're
-using `gcc-avr` version 4.9 or higher. 4.8 and lower do not contain the
-proper definitions for ATMEGA32A MCUs and QMK will fail while attempting
-to compile a HEX for Pearl 40%.
-
-E.g. you cannot compile Pearl 40% HEX on a regular Ubuntu 14.04 as
-`gcc-avr` version is maxed to 4.8 on it.
-
-Additionally you need an operational `bootloadHID` binary.
-
-You can install `bootloadHID` by taking the following steps:
-
-    $ git clone https://github.com/robertgzr/bootloadHID ~/tmp/bootloadHIDsrc
-    $ cd ~/tmp/bootloadHIDsrc/commandline
-    $ make VENDORID=0x16c0 PRODUCTID=0x05DF # vid and pid for atmega32a
-    $ chmod +x bootloadHID && cp bootloadHID /usr/bin/bootloadHID
-    
-Running `which bootloadHID` should return `/usr/bin/bootloadHID`.
-    
-### Compiling
-
-Enter the QMK root directory and compile a keymap with the following
-command:
-
-    $ make pearl:<keymap>
-    
-where `<keymap>` is a layout directory under the `pearl` directory.
-
-QMK should compile a HEX (called `pearl_<keymap>.hex`) for you, which
-you can flash using `bootloadHID`.
-
-### Flashing
-
-To enable Pearl 40% bootloading mode, unplug the keyboard, then plug it
-in while holding `Esc` at the same time (the top-leftmost switch on the
-PCB, next to the USB connector). Once the board is in bootload mode,
-issue the following command (you might require `sudo` to perform the
-command):
-
-    # assuming we're still in the QMK root dir where you compiled a HEX into
-    $ bootloadHID -r ./pearl_<keymap>.hex
-
-You should see something similar to
-
-    > Page size = <value>
-    > Device size = <value>; <value> remaining
-    > Uploading <value> bytes starting at 0 (0x0)
-    > <value> ... <current value>
-    
-where `<current value>` should be slowly increasing as the HEX is being
-flashed to the board. If there is some warning about `resource busy` it
-should still work OK.
-
-Once done the board underglow should turn red and the new firmware has
-been flashed. If you can't type on the board try plugging it in again
-(without holding any keys to prevent accidentally setting it into
-bootload mode again).
diff --git a/keyboards/pearl/config.h b/keyboards/pearl/config.h
index 6edf170d9..00850b8f0 100644
--- a/keyboards/pearl/config.h
+++ b/keyboards/pearl/config.h
@@ -35,8 +35,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROWS 4
 #define MATRIX_COLS 13
 
-#define MATRIX_ROW_PINS { B0, B1, B2, B3, B4, B5, B6, B7 }
-#define MATRIX_COL_PINS { A0, A1, A2, A3, A4, A5, A6, A7, C7, C6}
+#define MATRIX_ROW_PINS { B0, B1, B2, B3 }
+#define MATRIX_COL_PINS { A0, A1, A2, A3, A4, A5, A6, A7, C7, C6, C5, C4, C3}
 #define UNUSED_PINS
 
 #define DIODE_DIRECTION COL2ROW
diff --git a/keyboards/pearl/i2c.c b/keyboards/pearl/i2c.c
deleted file mode 100644
index a4f952135..000000000
--- a/keyboards/pearl/i2c.c
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
-Copyright 2016 Luiz Ribeiro <luizribeiro@gmail.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/>.
-*/
-
-// Please do not modify this file 
-
-#include <avr/io.h>
-#include <util/twi.h>
-
-#include "i2c.h"
-
-void i2c_set_bitrate(uint16_t bitrate_khz) {
-    uint8_t bitrate_div = ((F_CPU / 1000l) / bitrate_khz);
-    if (bitrate_div >= 16) {
-        bitrate_div = (bitrate_div - 16) / 2;
-    }
-    TWBR = bitrate_div;
-}
-
-void i2c_init(void) {
-    // set pull-up resistors on I2C bus pins
-    PORTC |= 0b11;
-
-    i2c_set_bitrate(400);
-
-    // enable TWI (two-wire interface)
-    TWCR |= (1 << TWEN);
-
-    // enable TWI interrupt and slave address ACK
-    TWCR |= (1 << TWIE);
-    TWCR |= (1 << TWEA);
-}
-
-uint8_t i2c_start(uint8_t address) {
-    // reset TWI control register
-    TWCR = 0;
-
-    // begin transmission and wait for it to end
-    TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
-    while (!(TWCR & (1<<TWINT)));
-
-    // check if the start condition was successfully transmitted
-    if ((TWSR & 0xF8) != TW_START) {
-        return 1;
-    }
-
-    // transmit address and wait
-    TWDR = address;
-    TWCR = (1<<TWINT) | (1<<TWEN);
-    while (!(TWCR & (1<<TWINT)));
-
-    // check if the device has acknowledged the READ / WRITE mode
-    uint8_t twst = TW_STATUS & 0xF8;
-    if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) {
-        return 1;
-    }
-
-    return 0;
-}
-
-void i2c_stop(void) {
-    TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
-}
-
-uint8_t i2c_write(uint8_t data) {
-    TWDR = data;
-
-    // transmit data and wait
-    TWCR = (1<<TWINT) | (1<<TWEN);
-    while (!(TWCR & (1<<TWINT)));
-
-    if ((TWSR & 0xF8) != TW_MT_DATA_ACK) {
-        return 1;
-    }
-
-    return 0;
-}
-
-uint8_t i2c_send(uint8_t address, uint8_t *data, uint16_t length) {
-    if (i2c_start(address)) {
-        return 1;
-    }
-
-    for (uint16_t i = 0; i < length; i++) {
-        if (i2c_write(data[i])) {
-            return 1;
-        }
-    }
-
-    i2c_stop();
-
-    return 0;
-}
diff --git a/keyboards/pearl/i2c.h b/keyboards/pearl/i2c.h
deleted file mode 100644
index 93a69c94d..000000000
--- a/keyboards/pearl/i2c.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
-Copyright 2016 Luiz Ribeiro <luizribeiro@gmail.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/>.
-*/
-
-// Please do not modify this file 
-
-#ifndef __I2C_H__
-#define __I2C_H__
-
-void i2c_init(void);
-void i2c_set_bitrate(uint16_t bitrate_khz);
-uint8_t i2c_send(uint8_t address, uint8_t *data, uint16_t length);
-
-#endif
diff --git a/keyboards/pearl/matrix.c b/keyboards/pearl/matrix.c
deleted file mode 100644
index 57aa36b5f..000000000
--- a/keyboards/pearl/matrix.c
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
-Copyright 2017 Luiz Ribeiro <luizribeiro@gmail.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 <avr/io.h>
-#include <util/delay.h>
-
-#include "matrix.h"
-
-#ifndef DEBOUNCE
-#define DEBOUNCE	5
-#endif
-
-static uint8_t debouncing = DEBOUNCE;
-
-static matrix_row_t matrix[MATRIX_ROWS];
-static matrix_row_t matrix_debouncing[MATRIX_ROWS];
-
-void matrix_init(void) {
-    // all outputs for rows high
-    DDRB = 0xFF;
-    PORTB = 0xFF;
-    // all inputs for columns
-    DDRA = 0x00;
-    DDRC &= ~(0x111111<<2);
-    DDRD &= ~(1<<PIND7);
-    // all columns are pulled-up
-    PORTA = 0xFF;
-    PORTC |= (0b111111<<2);
-    PORTD |= (1<<PIND7);
-
-    // initialize matrix state: all keys off
-    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
-        matrix[row] = 0x00;
-        matrix_debouncing[row] = 0x00;
-    }
-}
-
-void matrix_set_row_status(uint8_t row) {
-    DDRB = (1 << row);
-    PORTB = ~(1 << row);
-}
-
-uint8_t bit_reverse(uint8_t x) {
-    x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
-    x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
-    x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
-    return x;
-}
-
-uint8_t matrix_scan(void) {
-    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
-        matrix_set_row_status(row);
-        _delay_us(5);
-
-        matrix_row_t cols = (
-            // cols 0..7, PORTA 0 -> 7
-            (~PINA) & 0xFF
-        ) | (
-            // cols 8..13, PORTC 7 -> 0
-            bit_reverse((~PINC) & 0xFF) << 8
-        ) | (
-            // col 14, PORTD 7
-            ((~PIND) & (1 << PIND7)) << 7
-        );
-
-        if (matrix_debouncing[row] != cols) {
-            matrix_debouncing[row] = cols;
-            debouncing = DEBOUNCE;
-        }
-    }
-
-    if (debouncing) {
-        if (--debouncing) {
-            _delay_ms(1);
-        } else {
-            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-                matrix[i] = matrix_debouncing[i];
-            }
-        }
-    }
-
-    matrix_scan_user();
-
-    return 1;
-}
-
-inline matrix_row_t matrix_get_row(uint8_t row) {
-    return matrix[row];
-}
-
-void matrix_print(void) {
-}
diff --git a/keyboards/pearl/pearl.c b/keyboards/pearl/pearl.c
index 3bbadb0a7..c8cd8a860 100644
--- a/keyboards/pearl/pearl.c
+++ b/keyboards/pearl/pearl.c
@@ -15,16 +15,11 @@ 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 "pearl.h"
 #include "rgblight.h"
-#include "backlight.h"
-
-#include <avr/pgmspace.h>
-
-#include "action_layer.h"
-#include "i2c.h"
+#include "i2c_master.h"
 #include "quantum.h"
 
+#ifdef RGBLIGHT_ENABLE
 extern rgblight_config_t rgblight_config;
 
 void rgblight_set(void) {
@@ -37,23 +32,59 @@ void rgblight_set(void) {
     }
 
     i2c_init();
-    i2c_send(0xb0, (uint8_t*)led, 3 * RGBLED_NUM);
+    i2c_transmit(0xb0, (uint8_t*)led, 3 * RGBLED_NUM, 100);
 }
+#endif
 
-void backlight_init_ports(void) {
-  DDRD |= (1<<4);
-  PORTD &= ~(1<<4);
+void matrix_init_kb(void) {
+#ifdef RGBLIGHT_ENABLE
+    if (rgblight_config.enable) {
+        i2c_init();
+        i2c_transmit(0xb0, (uint8_t*)led, 3 * RGBLED_NUM, 100);
+    }
+#endif
+    // call user level keymaps, if any
+    matrix_init_user();
 }
 
-void backlight_set(uint8_t level) {
-  if (level > 0) {
-    PORTD |= (1<<4);
-  } else {
-    PORTD &= ~(1<<4);
-  }
+void matrix_scan_kb(void) {
+#ifdef RGBLIGHT_ENABLE
+    rgblight_task();
+#endif
+    matrix_scan_user();
+    /* Nothing else for now. */
 }
 
 __attribute__ ((weak))
 void matrix_scan_user(void) {
-    rgblight_task();
 }
+
+void backlight_init_ports(void) {
+    // initialize pins D0, D1, D4 and D6 as output
+    setPinOutput(D0);
+    setPinOutput(D1);
+    setPinOutput(D4);
+    setPinOutput(D6);
+
+    // turn backlight LEDs on
+    writePinHigh(D0);
+    writePinHigh(D1);
+    writePinHigh(D4);
+    writePinHigh(D6);
+}
+
+void backlight_set(uint8_t level) {
+	if (level == 0) {
+        // turn backlight LEDs off
+        writePinLow(D0);
+        writePinLow(D1);
+        writePinLow(D4);
+        writePinLow(D6);
+	} else {
+        // turn backlight LEDs on
+        writePinHigh(D0);
+        writePinHigh(D1);
+        writePinHigh(D4);
+        writePinHigh(D6);
+	}
+}
\ No newline at end of file
diff --git a/keyboards/pearl/pearl.h b/keyboards/pearl/pearl.h
index 6f5fbce5d..72df1595d 100644
--- a/keyboards/pearl/pearl.h
+++ b/keyboards/pearl/pearl.h
@@ -15,8 +15,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef PEARL_H
-#define PEARL_H
+#pragma once
 
 #include "quantum.h"
 #include "pearl.h"
@@ -56,6 +55,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
   { K20, K21, K22,   K23,   K24, K25, K26,   K27,   K28,   K29, K2A, K2B,   KC_NO}, \
   { K30, K31, KC_NO, KC_NO, KC_NO, K35, KC_NO, KC_NO, KC_NO, K39, K3A, KC_NO, KC_NO}, \
 }
-
-
-#endif
diff --git a/keyboards/pearl/readme.md b/keyboards/pearl/readme.md
new file mode 100644
index 000000000..c39d86cf3
--- /dev/null
+++ b/keyboards/pearl/readme.md
@@ -0,0 +1,47 @@
+# Pearl 40%
+
+Pearl 40% is a keyboard designed by Koobaczech. It uses an Atmel
+ATMEGA32A MCU.
+
+Keyboard Maintainer: [Ethan Madden](https://github.com/jetpacktuxedo)  
+Hardware Supported: Pearl  
+Hardware Availability: [Geekhack Group Buy](https://geekhack.org/index.php?topic=92259.0) 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make pearl:default
+
+Flashing
+
+ps2avr(GB) boards use an atmega32a microcontroller and a different bootloader. It is not flashable using the regular QMK methods. 
+
+**Reset Key:** Hold down the key located at `K00`.
+
+Windows: 
+1. Download [HIDBootFlash](http://vusb.wikidot.com/project:hidbootflash).
+2. Place your keyboard into reset. 
+3. Press the `Find Device` button and ensure that your keyboard is found.
+4. Press the `Open .hex File` button and locate the `.hex` file you created.
+5. Press the `Flash Device` button and wait for the process to complete. 
+
+macOS:
+1. Install homebrew by typing the following:   
+    ```
+    /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+    ```
+2. Install `crosspack-avr`.  
+    ```
+    brew cask install crosspack-avr
+    ```
+3. Install the following packages:
+    ```
+    brew install python3
+    pip3 install pyusb
+    brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+    ```
+4. Place your keyboard into reset. 
+5. Flash the board by typing `bootloadHID -r` followed by the path to your `.hex` file. 
+
+**Please Note:** You will need to use the `EEP_RST` keycode first, followed by unplugging/replugging the board to get RGB underglow effects to work.
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/pearl/rules.mk b/keyboards/pearl/rules.mk
index fac85172e..4db92d121 100644
--- a/keyboards/pearl/rules.mk
+++ b/keyboards/pearl/rules.mk
@@ -31,7 +31,7 @@ F_CPU = 12000000
 BOOTLOADER = bootloadHID
 
 # build options
-BOOTMAGIC_ENABLE = full
+BOOTMAGIC_ENABLE = no
 MOUSEKEY_ENABLE = no
 EXTRAKEY_ENABLE = yes
 CONSOLE_ENABLE = yes
@@ -43,8 +43,7 @@ RGBLIGHT_CUSTOM_DRIVER = yes
 OPT_DEFS = -DDEBUG_LEVEL=0
 
 # custom matrix setup
-CUSTOM_MATRIX = yes
-SRC = matrix.c i2c.c
+SRC = i2c_master.c
 
 # programming options
 PROGRAM_CMD = ./util/atmega32a_program.py $(TARGET).hex
diff --git a/keyboards/pearl/usbconfig.h b/keyboards/pearl/usbconfig.h
index d2d848fcd..54a7d20f1 100644
--- a/keyboards/pearl/usbconfig.h
+++ b/keyboards/pearl/usbconfig.h
@@ -8,8 +8,7 @@
  * This Revision: $Id: usbconfig-prototype.h 785 2010-05-30 17:57:07Z cs $
  */
 
-#ifndef __usbconfig_h_included__
-#define __usbconfig_h_included__
+#pragma once
 
 #include "config.h"
 
@@ -392,5 +391,3 @@ section at the end of this file).
 /* #define USB_INTR_PENDING        EIFR */
 #define USB_INTR_PENDING_BIT    INTF1
 #define USB_INTR_VECTOR         INT1_vect
-
-#endif /* __usbconfig_h_included__ */