* Convert remaining PS2AVRGB boards to I2C WS2812 driver * Add back functions to make the custom matrices happypull/7262/head
@ -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; | |||
} |
@ -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 |
@ -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; | |||
} |
@ -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 |
@ -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; | |||
} |
@ -1,25 +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/>. | |||
*/ | |||
#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 |
@ -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; | |||
} |
@ -1,22 +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/>. | |||
*/ | |||
#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 |
@ -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; | |||
} |
@ -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 |
@ -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; | |||
} |
@ -1,25 +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/>. | |||
*/ | |||
#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 |
@ -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; | |||
} |
@ -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 |
@ -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; | |||
} |
@ -1,25 +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); | |||
@ -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; | |||
} |
@ -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 |
@ -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; | |||
} |
@ -1,25 +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); | |||
@ -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; | |||
} |
@ -1,25 +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/>. | |||
*/ | |||
#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 |
@ -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; | |||
} |
@ -1,25 +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/>. | |||
*/ | |||
#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 |
@ -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; | |||
} |
@ -1,25 +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/>. | |||
*/ | |||
#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 |