1 files changed, 25 insertions, 10 deletions

diff --git a/drivers/avr/i2c_slave.c b/drivers/avr/i2c_slave.c
index dbb9fb0df3..3fb684f70a 100755..100644
--- a/drivers/avr/i2c_slave.c
+++ b/drivers/avr/i2c_slave.c
@@ -1,3 +1,18 @@
+/*  Copyright (C) 2019 Elia Ritterbusch
+ +
+ *  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 3 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 <https://www.gnu.org/licenses/>.
+ */
 /* Library made by: g4lvanix
  * Github repository: https://github.com/g4lvanix/I2C-slave-lib
  */
@@ -12,24 +27,24 @@
 volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
 
 static volatile uint8_t buffer_address;
-static volatile bool slave_has_register_set = false;
+static volatile bool    slave_has_register_set = false;
 
-void i2c_slave_init(uint8_t address){
+void i2c_slave_init(uint8_t address) {
     // load address into TWI address register
     TWAR = address;
     // set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
     TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);
 }
 
-void i2c_slave_stop(void){
+void i2c_slave_stop(void) {
     // clear acknowledge and enable bits
     TWCR &= ~((1 << TWEA) | (1 << TWEN));
 }
 
-ISR(TWI_vect){
+ISR(TWI_vect) {
     uint8_t ack = 1;
 
-    switch(TW_STATUS){
+    switch (TW_STATUS) {
         case TW_SR_SLA_ACK:
             // The device is now a slave receiver
             slave_has_register_set = false;
@@ -38,14 +53,14 @@ ISR(TWI_vect){
         case TW_SR_DATA_ACK:
             // This device is a slave receiver and has received data
             // First byte is the location then the bytes will be writen in buffer with auto-incriment
-            if(!slave_has_register_set){
+            if (!slave_has_register_set) {
                 buffer_address = TWDR;
 
                 if (buffer_address >= I2C_SLAVE_REG_COUNT) {  // address out of bounds dont ack
-                  ack            = 0;
-                  buffer_address = 0;
+                    ack            = 0;
+                    buffer_address = 0;
                 }
-                slave_has_register_set = true; // address has been receaved now fill in buffer
+                slave_has_register_set = true;  // address has been receaved now fill in buffer
             } else {
                 i2c_slave_reg[buffer_address] = TWDR;
                 buffer_address++;
@@ -68,4 +83,4 @@ ISR(TWI_vect){
 
     // Reset i2c state machine to be ready for next interrupt
     TWCR |= (1 << TWIE) | (1 << TWINT) | (ack << TWEA) | (1 << TWEN);
-}
\ No newline at end of file
+}