From a972b262748efe977d9a0f8f47fdc36dc9c787e3 Mon Sep 17 00:00:00 2001
From: Jason Barnachea <jrbarnachea@gmail.com>
Date: Sat, 10 Feb 2018 14:24:54 -0800
Subject: Add JC65 ps2avrGB keyboard (#2351)

* Adds JC65 ps2avrGB keyboard

* Adds default keymap

* Adds personal keymap

* Backlight On/off support

Migrated code from the BFake. Functionality only on BL_ON, BL_OFF,
BL_TOGG.

* Backlighting config adjustment

Only 1 level supported.

* Personal keymap update

BL toggle added and RGB layer updates.

* Renamed jc65 ps2avrgb directory

Renamed directory for more clarity.

* Default keymap and default rules

* Personal keymap and personal rules

* Group JC65 QMK and PS2 versions

Group JC65 QMK and PS2 versions, Split directories, Readme for parent
folder.

* Default keycaps and personal keymaps re-added

Default and personal keymaps re-added. Keymaps, Readme, Rules.mk, and
config.h

* v32a default keymap rules

Default to no.

* RGB and Backlight default settings

Set to yes.

* Rules.mk defaults for personal keymap

Rules.mk defaults for personal keymap

* Revised keyboard readme make paths

Revised.

* Path correction

* jc65 default folder set

set default pcb to qmk version

* default rules for v32a

set to enable backlight and rgb by default.
---
 keyboards/jc65/v32a/i2c.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 keyboards/jc65/v32a/i2c.c

(limited to 'keyboards/jc65/v32a/i2c.c')

diff --git a/keyboards/jc65/v32a/i2c.c b/keyboards/jc65/v32a/i2c.c
new file mode 100644
index 0000000000..a4f9521352
--- /dev/null
+++ b/keyboards/jc65/v32a/i2c.c
@@ -0,0 +1,106 @@
+/*
+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;
+}
-- 
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