[Keyboard] Refactor budget96 to remove custom i2c code in favor of QMK i2c_master (#5571)

* remove custom i2c code in favor of QMK i2c_master

* fix readme

* disable bootmagic as it doesn't work on bmc boards

6 files changed, 6 insertions, 142 deletions

diff --git a/keyboards/donutcables/budget96/budget96.c b/keyboards/donutcables/budget96/budget96.c
index 966dd4c12..7831a91f5 100644
--- a/keyboards/donutcables/budget96/budget96.c
+++ b/keyboards/donutcables/budget96/budget96.c
@@ -25,7 +25,7 @@
 #include <avr/pgmspace.h>
 
 #include "action_layer.h"
-#include "i2c.h"
+#include "i2c_master.h"
 #include "quantum.h"
 
 __attribute__ ((weak))
@@ -45,7 +45,7 @@ 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
 
diff --git a/keyboards/donutcables/budget96/config.h b/keyboards/donutcables/budget96/config.h
index 369cbdd07..74661d828 100644
--- a/keyboards/donutcables/budget96/config.h
+++ b/keyboards/donutcables/budget96/config.h
@@ -39,9 +39,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define NO_BACKLIGHT_CLOCK
 #define BACKLIGHT_LEVELS 1
 #define RGBLIGHT_ANIMATIONS
-
-// Set bootmagic lite key to the key commonly programmed as Esc. 
-#define BOOTMAGIC_LITE_ROW 5
-#define BOOTMAGIC_LITE_COLUMN 0 
-
-/* key combination for command */
diff --git a/keyboards/donutcables/budget96/i2c.c b/keyboards/donutcables/budget96/i2c.c
deleted file mode 100644
index e8c4455ad..000000000
--- a/keyboards/donutcables/budget96/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/donutcables/budget96/i2c.h b/keyboards/donutcables/budget96/i2c.h
deleted file mode 100644
index aecc2c05a..000000000
--- a/keyboards/donutcables/budget96/i2c.h
+++ /dev/null
@@ -1,24 +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
-
-#pragma once
-
-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);
diff --git a/keyboards/donutcables/budget96/readme.md b/keyboards/donutcables/budget96/readme.md
index e44b9a3e7..70e4d3afb 100644
--- a/keyboards/donutcables/budget96/readme.md
+++ b/keyboards/donutcables/budget96/readme.md
@@ -12,7 +12,7 @@ Make example for this keyboard (after setting up your build environment):
 
 Flashing
 
-**Reset Key:** Hold down the key located at `K00`, commonly programmed as left control while plugging in the keyboard. You may also hold down the key located at `K50`, commonly programmed as the `Esc` key. 
+**Reset Key:** Hold down the key located at `K00`, commonly programmed as left control while plugging in the keyboard.
 
 ps2avr(GB) boards use an atmega32a microcontroller and a different bootloader. It is not flashable using the regular QMK methods. 
 
@@ -34,7 +34,7 @@ macOS:
     ```
 3. Install the following packages:
     ```
-    brew install python
+    brew install python3
     pip3 install pyusb
     brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
 
diff --git a/keyboards/donutcables/budget96/rules.mk b/keyboards/donutcables/budget96/rules.mk
index e25b03727..67697ac73 100644
--- a/keyboards/donutcables/budget96/rules.mk
+++ b/keyboards/donutcables/budget96/rules.mk
@@ -31,7 +31,7 @@ F_CPU = 12000000
 BOOTLOADER = bootloadHID
 
 # build options
-BOOTMAGIC_ENABLE = lite
+BOOTMAGIC_ENABLE = no
 MOUSEKEY_ENABLE = yes
 EXTRAKEY_ENABLE = yes
 CONSOLE_ENABLE = yes
@@ -43,7 +43,7 @@ RGBLIGHT_CUSTOM_DRIVER = yes
 OPT_DEFS = -DDEBUG_LEVEL=0
 
 # custom matrix setup
-SRC = i2c.c
+SRC = i2c_master.c
 
 # programming options
 PROGRAM_CMD = ./util/atmega32a_program.py $(TARGET).hex