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-rw-r--r--keyboards/percent/skog/i2c.c106
1 files changed, 0 insertions, 106 deletions
diff --git a/keyboards/percent/skog/i2c.c b/keyboards/percent/skog/i2c.c
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index a4f9521352..0000000000
--- a/keyboards/percent/skog/i2c.c
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-/*
-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;
-}