X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=drivers%2Favr%2Fi2c_master.c;h=30ea760c9ff00bc7e4fb9e8c9837f555d9b2180c;hb=6380f8319057d33bb6d07c66789867e49c634504;hp=97f69004363f62e8c67fa53fb735c192065a5197;hpb=bad56a4f2b91fc8591f6d33a1710ea0050abcfbf;p=qmk_firmware.git

diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index 97f690043..30ea760c9 100755
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -19,200 +19,201 @@ void i2c_init(void)
   //TWBR = 10;
 }
 
-uint8_t i2c_start(uint8_t address)
+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);
 
-  #ifdef I2C_TIMEOUT
-    uint16_t timeout_timer = timer_read();
-    while( !(TWCR & (1<<TWINT)) ) {
-      if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  uint16_t timeout_timer = timer_read();
+  while( !(TWCR & (1<<TWINT)) ) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-  // wait for end of transmission
-    while( !(TWCR & (1<<TWINT)) );
-  #endif
+  }
 
 	// check if the start condition was successfully transmitted
-	if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return 1; }
+	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);
 
-  #ifdef I2C_TIMEOUT
-    timeout_timer = timer_read();
-    while( !(TWCR & (1<<TWINT)) ) {
-      if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  timeout_timer = timer_read();
+  while( !(TWCR & (1<<TWINT)) ) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-  // wait for end of transmission
-    while( !(TWCR & (1<<TWINT)) );
-  #endif
+  }
 
 	// 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;
+	if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return I2C_STATUS_ERROR;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_write(uint8_t data)
+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);
 
-  #ifdef I2C_TIMEOUT
-    uint16_t timeout_timer = timer_read();
-    while( !(TWCR & (1<<TWINT)) ) {
-      if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  uint16_t timeout_timer = timer_read();
+  while( !(TWCR & (1<<TWINT)) ) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-	// wait for end of transmission
-    while( !(TWCR & (1<<TWINT)) );
-  #endif
+  }
 
-	if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return 1; }
+	if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return I2C_STATUS_ERROR; }
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_read_ack(void)
+int16_t i2c_read_ack(uint16_t timeout)
 {
 
 	// start TWI module and acknowledge data after reception
 	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWEA);
 
-  #ifdef I2C_TIMEOUT
-    uint16_t timeout_timer = timer_read();
-    while( !(TWCR & (1<<TWINT)) ) {
-      if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  uint16_t timeout_timer = timer_read();
+  while( !(TWCR & (1<<TWINT)) ) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-  // wait for end of transmission
-    while( !(TWCR & (1<<TWINT)) );
-  #endif
+  }
 
 	// return received data from TWDR
 	return TWDR;
 }
 
-uint8_t i2c_read_nack(void)
+int16_t i2c_read_nack(uint16_t timeout)
 {
 
 	// start receiving without acknowledging reception
 	TWCR = (1<<TWINT) | (1<<TWEN);
 
-    #ifdef I2C_TIMEOUT
-    uint16_t timeout_timer = timer_read();
-    while( !(TWCR & (1<<TWINT)) ) {
-      if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  uint16_t timeout_timer = timer_read();
+  while( !(TWCR & (1<<TWINT)) ) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-  // wait for end of transmission
-    while( !(TWCR & (1<<TWINT)) );
-  #endif
+  }
 
 	// return received data from TWDR
 	return TWDR;
 }
 
-uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(address | I2C_WRITE)) return 1;
+  i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+	if (status) return status;
 
-	for (uint16_t i = 0; i < length; i++)
-	{
-		if (i2c_write(data[i])) return 1;
+	for (uint16_t i = 0; i < length; i++) {
+		status = i2c_write(data[i], timeout);
+    if (status) return status;
 	}
 
-	i2c_stop();
+	status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(address | I2C_READ)) return 1;
-
-	for (uint16_t i = 0; i < (length-1); i++)
-	{
-		data[i] = i2c_read_ack();
+  i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+	if (status) return status;
+
+	for (uint16_t i = 0; i < (length-1); i++) {
+    status = i2c_read_ack(timeout);
+    if (status >= 0) {
+      data[i] = status;
+    } else {
+      return status;
+    }
 	}
-	data[(length-1)] = i2c_read_nack();
 
-	i2c_stop();
+  status = i2c_read_nack(timeout);
+  if (status >= 0 ) {
+    data[(length-1)] = status;
+  } else {
+    return status;
+  }
+
+  status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(devaddr | 0x00)) return 1;
+  i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+	if (status) return status;
 
-	i2c_write(regaddr);
+	status = i2c_write(regaddr, timeout);
+  if (status) return status;
 
-	for (uint16_t i = 0; i < length; i++)
-	{
-		if (i2c_write(data[i])) return 1;
+	for (uint16_t i = 0; i < length; i++) {
+    status = i2c_write(data[i], timeout);
+		if (status) return status;
 	}
 
-	i2c_stop();
+	status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(devaddr)) return 1;
+  i2c_status_t status = i2c_start(devaddr, timeout);
+	if (status) return status;
 
-	i2c_write(regaddr);
+  status = i2c_write(regaddr, timeout);
+  if (status) return status;
 
-	if (i2c_start(devaddr | 0x01)) return 1;
+  status = i2c_start(devaddr | 0x01, timeout);
+	if (status) return status;
 
-	for (uint16_t i = 0; i < (length-1); i++)
-	{
-		data[i] = i2c_read_ack();
+	for (uint16_t i = 0; i < (length-1); i++) {
+		status = i2c_read_ack(timeout);
+    if (status >= 0) {
+      data[i] = status;
+    } else {
+      return status;
+    }
 	}
-	data[(length-1)] = i2c_read_nack();
 
-	i2c_stop();
+  status = i2c_read_nack(timeout);
+  if (status >= 0 ) {
+    data[(length-1)] = status;
+  } else {
+    return status;
+  }
+
+  status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_stop(void)
+i2c_status_t i2c_stop(uint16_t timeout)
 {
 	// transmit STOP condition
 	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
 
-  #ifdef I2C_TIMEOUT
-    uint16_t timeout_timer = timer_read();
-    while(TWCR & (1<<TWSTO)) {
-        if ((timer_read() - timeout_timer) > I2C_TIMEOUT) {
-        return 2; // should make these codes standard
-      }
+  uint16_t timeout_timer = timer_read();
+  while(TWCR & (1<<TWSTO)) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
+      return I2C_STATUS_TIMEOUT;
     }
-  #else
-    // wait for end of transmission
-    while(TWCR & (1<<TWSTO));
-  #endif
+  }
 
-  return 0;
+  return I2C_STATUS_SUCCESS;
 }