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author | zvecr <git@zvecr.com> | 2019-04-08 19:35:47 +0100 |
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committer | Drashna Jaelre <drashna@live.com> | 2019-04-08 11:35:47 -0700 |
commit | da9bb590551e4e40552f301852074dffccd2c29d (patch) | |
tree | 5d8fd5838f6e2060b7cf66619b40a8f8d5533413 /keyboards/jj4x4/i2c.c | |
parent | 15d7c5f0bdfff97d5d7af6d474cc57d66b6bba94 (diff) | |
download | firmware-da9bb590551e4e40552f301852074dffccd2c29d.tar.gz firmware-da9bb590551e4e40552f301852074dffccd2c29d.tar.bz2 firmware-da9bb590551e4e40552f301852074dffccd2c29d.zip |
[Keyboard] Refactor jj4x4 to current standards (#5567)
* Refactor 4x4 in line with current ps2avrgb template
* Add backlight pwm bodge till #4324 lands
* Disable bootmagic lite as it seems to not work on atmega32a/bootloadHID
Diffstat (limited to 'keyboards/jj4x4/i2c.c')
-rw-r--r-- | keyboards/jj4x4/i2c.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/keyboards/jj4x4/i2c.c b/keyboards/jj4x4/i2c.c deleted file mode 100644 index c27f3e3d1..000000000 --- a/keyboards/jj4x4/i2c.c +++ /dev/null @@ -1,104 +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/>. -*/ - -#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; -} |