C++ (Cpp) SCL_0 Examples

Example #1

File: sht11.c Project: jgkenta/contiki-plus

/*
 * Return true if we received an ACK.
 */
static int
swrite(unsigned _c)
{
  unsigned char c = _c;
  int i;
  int ret;

  for(i = 0; i < 8; i++, c <<= 1) {
    if(c & 0x80) {
      SDA_1();
    } else {
      SDA_0();
    }
    SCL_1();
    delay_400ns();
    SCL_0();
  }

  SDA_1();
  SDA_IN();
  SCL_1();
  delay_400ns();
  ret = !SDA_IS_1;

  SCL_0();

  return ret;
}

Example #2

File: sht11.c Project: jgkenta/contiki-plus

/*---------------------------------------------------------------------------*/
static unsigned
sread(int send_ack)
{
  int i;
  unsigned char c = 0x00;

  SDA_1();
  SDA_IN();
  for(i = 0; i < 8; i++) {
    c <<= 1;
    SCL_1();
    delay_400ns();
    if(SDA_IS_1) {
      c |= 0x1;
    }
    SCL_0();
  }

  SDA_OUT();
  if(send_ack) {
    SDA_0();
  }
  SCL_1();
  delay_400ns();
  SCL_0();

  SDA_1();			/* Release SDA */
  SDA_IN();

  return c;
}

Example #3

File: twi_m.c Project: wtos03/Geartronics-Git-Sever

uint8_t tw_send_byte(uint8_t data)
{
	register uint8_t i;
	
	
	for (i = 0; i <= 7; i++) {
		if (data & 0x80) {
			SDA_1();
		} else {
			SDA_0(); 
		}
		SCL_1(); 
		_delay_loop_1(TWI_SW_DELAY);
		SCL_0(); 
		_delay_loop_1(TWI_SW_DELAY);
		data = data << 1;
	}
	RELEASE_SDA();
	SCL_1(); 
	_delay_loop_1(TWI_SW_DELAY);
	if(bit_is_set(TWI_PIN_SDA, bSDA)) {
		SCL_0();
		_delay_loop_1(TWI_SW_DELAY);
		return 0;		//Acknowledge NOT received
	}
	SCL_0();
	_delay_loop_1(TWI_SW_DELAY);
	return 1;
}

Example #4

File: twi_m.c Project: wtos03/Geartronics-Git-Sever

int tw_recv_byte(uint8_t ack)
{
	uint8_t i, data;

	RELEASE_SDA();
	data = 0;
	for (i = 0; i <= 7; i++) {
		SCL_1(); 
		_delay_loop_1(TWI_SW_DELAY);
		data <<= 1;
		if (bit_is_set (TWI_PIN_SDA, bSDA))
			data++;
		SCL_0(); 
		_delay_loop_1(TWI_SW_DELAY);
	}
	if (!ack) {	
		SDA_1();	/*Set NO ACK*/
	} else {		
		SDA_0(); 	/*Set ACK*/
	}
	SCL_1();
	_delay_loop_1(TWI_SW_DELAY);
	SCL_0(); 
	_delay_loop_1(TWI_SW_DELAY);
	return data;
}

Example #5

File: sht11.c Project: jgkenta/contiki-plus

/*---------------------------------------------------------------------------*/
static void
sreset(void)
{
  int i;
  SDA_1();
  SCL_0();
  for(i = 0; i < 9 ; i++) {
    SCL_1();
    delay_400ns();
    SCL_0();
  }
  sstart();			/* Start transmission, why??? */
}

Example #6

File: sht11.c Project: anhquang/contiki

/*---------------------------------------------------------------------------*/
static void
sstart(void)
{
  SDA_1(); SCL_0();
  delay_400ns();
  SCL_1();
  delay_400ns();
  SDA_0();
  delay_400ns();
  SCL_0();
  delay_400ns();
  SCL_1();
  delay_400ns();
  SDA_1();
  delay_400ns();
  SCL_0();
}

Example #7

File: twi_m.c Project: wtos03/Geartronics-Git-Sever

void tw_stop(void)
{
	SDA_0(); 
	SCL_1();
	_delay_loop_1(TWI_SW_DELAY);
	SDA_1(); 
	_delay_loop_1(TWI_SW_DELAY);
	SCL_0(); 
	_delay_loop_1(TWI_SW_DELAY);
	//we need to free the bus
	RELEASE_SDA();
	SCL_1();
	_delay_loop_1(TWI_SW_DELAY);
}

Example #8

File: twi_m.c Project: wtos03/Geartronics-Git-Sever

uint8_t tw_start(void)
{
	RELEASE_SDA();
	SCL_1();
	_delay_loop_1(TWI_SW_DELAY);
	if(bit_is_clear(TWI_PIN_SDA,bSDA)) {
		return RC_FAIL;
	}
	SDA_0(); 
	_delay_loop_1(TWI_SW_DELAY);
	SCL_0(); 
	_delay_loop_1(TWI_SW_DELAY);
	return RC_SUCCESS;
}