1 files changed, 130 insertions, 130 deletions

diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index 0acc24642..52924437e 100755..100644
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -25,200 +25,200 @@
 #include "wait.h"
 
 #ifndef F_SCL
-#  define F_SCL 400000UL  // SCL frequency
+#    define F_SCL 400000UL  // SCL frequency
 #endif
 #define Prescaler 1
 #define TWBR_val ((((F_CPU / F_SCL) / Prescaler) - 16) / 2)
 
 void i2c_init(void) {
-  TWSR = 0; /* no prescaler */
-  TWBR = (uint8_t)TWBR_val;
+    TWSR = 0; /* no prescaler */
+    TWBR = (uint8_t)TWBR_val;
 
-  #ifdef __AVR_ATmega32A__
-  // set pull-up resistors on I2C bus pins
-  PORTC |= 0b11;
+#ifdef __AVR_ATmega32A__
+    // set pull-up resistors on I2C bus pins
+    PORTC |= 0b11;
 
-  // enable TWI (two-wire interface)
-  TWCR |= (1 << TWEN);
+    // enable TWI (two-wire interface)
+    TWCR |= (1 << TWEN);
 
-  // enable TWI interrupt and slave address ACK
-  TWCR |= (1 << TWIE);
-  TWCR |= (1 << TWEA);
-  #endif
+    // enable TWI interrupt and slave address ACK
+    TWCR |= (1 << TWIE);
+    TWCR |= (1 << TWEA);
+#endif
 }
 
 i2c_status_t i2c_start(uint8_t address, uint16_t timeout) {
-  // reset TWI control register
-  TWCR = 0;
-  // transmit START condition
-  TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
-
-  uint16_t timeout_timer = timer_read();
-  while (!(TWCR & (1 << TWINT))) {
-    if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
-      return I2C_STATUS_TIMEOUT;
-    }
-  }
-
-  // check if the start condition was successfully transmitted
-  if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) {
-    return I2C_STATUS_ERROR;
-  }
-
-  // load slave address into data register
-  TWDR = address;
-  // start transmission of address
-  TWCR = (1 << TWINT) | (1 << TWEN);
-
-  timeout_timer = timer_read();
-  while (!(TWCR & (1 << TWINT))) {
-    if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
-      return I2C_STATUS_TIMEOUT;
-    }
-  }
-
-  // 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 I2C_STATUS_ERROR;
-  }
-
-  return I2C_STATUS_SUCCESS;
+    // reset TWI control register
+    TWCR = 0;
+    // transmit START condition
+    TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN);
+
+    uint16_t timeout_timer = timer_read();
+    while (!(TWCR & (1 << TWINT))) {
+        if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+            return I2C_STATUS_TIMEOUT;
+        }
+    }
+
+    // check if the start condition was successfully transmitted
+    if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) {
+        return I2C_STATUS_ERROR;
+    }
+
+    // load slave address into data register
+    TWDR = address;
+    // start transmission of address
+    TWCR = (1 << TWINT) | (1 << TWEN);
+
+    timeout_timer = timer_read();
+    while (!(TWCR & (1 << TWINT))) {
+        if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+            return I2C_STATUS_TIMEOUT;
+        }
+    }
+
+    // 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 I2C_STATUS_ERROR;
+    }
+
+    return I2C_STATUS_SUCCESS;
 }
 
 i2c_status_t i2c_write(uint8_t data, uint16_t timeout) {
-  // load data into data register
-  TWDR = data;
-  // start transmission of data
-  TWCR = (1 << TWINT) | (1 << TWEN);
-
-  uint16_t timeout_timer = timer_read();
-  while (!(TWCR & (1 << TWINT))) {
-    if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
-      return I2C_STATUS_TIMEOUT;
+    // load data into data register
+    TWDR = data;
+    // start transmission of data
+    TWCR = (1 << TWINT) | (1 << TWEN);
+
+    uint16_t timeout_timer = timer_read();
+    while (!(TWCR & (1 << TWINT))) {
+        if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+            return I2C_STATUS_TIMEOUT;
+        }
     }
-  }
 
-  if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) {
-    return I2C_STATUS_ERROR;
-  }
+    if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) {
+        return I2C_STATUS_ERROR;
+    }
 
-  return I2C_STATUS_SUCCESS;
+    return I2C_STATUS_SUCCESS;
 }
 
 int16_t i2c_read_ack(uint16_t timeout) {
-  // start TWI module and acknowledge data after reception
-  TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
-
-  uint16_t timeout_timer = timer_read();
-  while (!(TWCR & (1 << TWINT))) {
-    if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
-      return I2C_STATUS_TIMEOUT;
+    // start TWI module and acknowledge data after reception
+    TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA);
+
+    uint16_t timeout_timer = timer_read();
+    while (!(TWCR & (1 << TWINT))) {
+        if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+            return I2C_STATUS_TIMEOUT;
+        }
     }
-  }
 
-  // return received data from TWDR
-  return TWDR;
+    // return received data from TWDR
+    return TWDR;
 }
 
 int16_t i2c_read_nack(uint16_t timeout) {
-  // start receiving without acknowledging reception
-  TWCR = (1 << TWINT) | (1 << TWEN);
-
-  uint16_t timeout_timer = timer_read();
-  while (!(TWCR & (1 << TWINT))) {
-    if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
-      return I2C_STATUS_TIMEOUT;
+    // start receiving without acknowledging reception
+    TWCR = (1 << TWINT) | (1 << TWEN);
+
+    uint16_t timeout_timer = timer_read();
+    while (!(TWCR & (1 << TWINT))) {
+        if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) {
+            return I2C_STATUS_TIMEOUT;
+        }
     }
-  }
 
-  // return received data from TWDR
-  return TWDR;
+    // return received data from TWDR
+    return TWDR;
 }
 
 i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) {
-  i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+    i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
 
-  for (uint16_t i = 0; i < length && status >= 0; i++) {
-    status = i2c_write(data[i], timeout);
-  }
+    for (uint16_t i = 0; i < length && status >= 0; i++) {
+        status = i2c_write(data[i], timeout);
+    }
 
-  i2c_stop();
+    i2c_stop();
 
-  return status;
+    return status;
 }
 
 i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) {
-  i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+    i2c_status_t status = i2c_start(address | I2C_READ, timeout);
 
-  for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
-    status = i2c_read_ack(timeout);
-    if (status >= 0) {
-      data[i] = status;
+    for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+        status = i2c_read_ack(timeout);
+        if (status >= 0) {
+            data[i] = status;
+        }
     }
-  }
 
-  if (status >= 0) {
-    status = i2c_read_nack(timeout);
     if (status >= 0) {
-      data[(length - 1)] = status;
+        status = i2c_read_nack(timeout);
+        if (status >= 0) {
+            data[(length - 1)] = status;
+        }
     }
-  }
 
-  i2c_stop();
+    i2c_stop();
 
-  return (status < 0) ? status : I2C_STATUS_SUCCESS;
+    return (status < 0) ? status : I2C_STATUS_SUCCESS;
 }
 
 i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) {
-  i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
-  if (status >= 0) {
-    status = i2c_write(regaddr, timeout);
+    i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+    if (status >= 0) {
+        status = i2c_write(regaddr, timeout);
 
-    for (uint16_t i = 0; i < length && status >= 0; i++) {
-      status = i2c_write(data[i], timeout);
+        for (uint16_t i = 0; i < length && status >= 0; i++) {
+            status = i2c_write(data[i], timeout);
+        }
     }
-  }
 
-  i2c_stop();
+    i2c_stop();
 
-  return status;
+    return status;
 }
 
 i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) {
-  i2c_status_t status = i2c_start(devaddr, timeout);
-  if (status < 0) {
-    goto error;
-  }
+    i2c_status_t status = i2c_start(devaddr, timeout);
+    if (status < 0) {
+        goto error;
+    }
 
-  status = i2c_write(regaddr, timeout);
-  if (status < 0) {
-    goto error;
-  }
+    status = i2c_write(regaddr, timeout);
+    if (status < 0) {
+        goto error;
+    }
 
-  status = i2c_start(devaddr | 0x01, timeout);
+    status = i2c_start(devaddr | 0x01, timeout);
 
-  for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
-    status = i2c_read_ack(timeout);
-    if (status >= 0) {
-      data[i] = status;
+    for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
+        status = i2c_read_ack(timeout);
+        if (status >= 0) {
+            data[i] = status;
+        }
     }
-  }
 
-  if (status >= 0) {
-    status = i2c_read_nack(timeout);
     if (status >= 0) {
-      data[(length - 1)] = status;
+        status = i2c_read_nack(timeout);
+        if (status >= 0) {
+            data[(length - 1)] = status;
+        }
     }
-  }
 
 error:
-  i2c_stop();
+    i2c_stop();
 
-  return (status < 0) ? status : I2C_STATUS_SUCCESS;
+    return (status < 0) ? status : I2C_STATUS_SUCCESS;
 }
 
 void i2c_stop(void) {
-  // transmit STOP condition
-  TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
+    // transmit STOP condition
+    TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO);
 }