unsigned int One_Wire_Reset(GPIO_TypeDef * GPIOx, u16 PINx)
{
unsigned int tmp;
PIN_IN(GPIOx, PINx);
if ((PIN_SYG(GPIOx, PINx))==0) return One_Wire_Bus_Low_Error;
PIN_OUT_PP(GPIOx, PINx);
PIN_OFF(GPIOx, PINx);
delay_us(Time_Reset_Low);
PIN_ON(GPIOx, PINx);
PIN_IN(GPIOx, PINx);
delay_us(Time_Pulse_Delay_High);
if ((PIN_SYG(GPIOx, PINx))==0) tmp=One_Wire_Success;
else tmp=One_Wire_Error_No_Echo;
delay_us(Time_After_Reset);
return tmp;
}
static uint8_t ds_read_bit()
{
uint8_t i, b = 1;
/* Begin a read/write time slot
* pull line low for between 1us and 15us */
PIN_LOW();
PIN_OUT();
_delay_us(BEGIN_TIMESLOT);
PIN_IN();
_delay_us(DELAY_TIMESLOT);
/* If the sensor pulls the line low within
* the time slot the bit is 0 */
for(i = 0; i < TIMESLOT - BEGIN_TIMESLOT; i++)
{
if(!READ_PIN()) b = 0;
_delay_us(1);
}
_delay_us(RECOVERY);
return(b);
}
static void ds_write_bit(uint8_t b)
{
/* Begin a read/write time slot
* pull line low for between 1us and 15us */
PIN_LOW();
PIN_OUT();
_delay_us(BEGIN_TIMESLOT);
/* "1" is written by releasing the line immediatly */
if(b) PIN_IN();
/* Wait for the write slot to end and then release the line */
_delay_us(TIMESLOT - BEGIN_TIMESLOT);
PIN_IN();
_delay_us(RECOVERY);
}
static void lcdPrepareRead(void)
{
PIN_IN(LCD_D0);
PIN_IN(LCD_D1);
PIN_IN(LCD_D2);
PIN_IN(LCD_D3);
PIN_IN(LCD_D4);
PIN_IN(LCD_D5);
PIN_IN(LCD_D6);
PIN_IN(LCD_D7);
CMD_READ();
}
unsigned char One_Wire_Read_Bit (GPIO_TypeDef * GPIOx, u16 PINx)
{
unsigned char tmp;
PIN_OUT_PP(GPIOx, PINx);
PIN_OFF(GPIOx, PINx);
delay_us(Time_Hold_Down);
PIN_IN(GPIOx, PINx);
delay_us(Time_Pulse_Delay_Low);
if ((PIN_SYG(GPIOx, PINx))!=0) tmp = 1;
else tmp = 0;
delay_us(Time_Pulse_Delay_High);
return tmp;
}
void One_Wire_Write_Bit (unsigned char Bit,GPIO_TypeDef * GPIOx, u16 PINx)
{
PIN_OUT_PP(GPIOx, PINx);
PIN_OFF(GPIOx, PINx);
if (Bit==0)
{
delay_us(Time_Pulse_Delay_High);
PIN_ON(GPIOx, PINx);
delay_us(Time_Pulse_Delay_Low);
}
else
{
delay_us(Time_Pulse_Delay_Low);
PIN_ON(GPIOx, PINx);
delay_us(Time_Pulse_Delay_High);
}
PIN_IN(GPIOx, PINx);
}
static int ds_reset()
{
/* Reset pulse - pull line low for at least 480us */
PIN_LOW();
PIN_OUT();
_delay_us(RESET_PULSE);
PIN_IN();
/* The sensor should respond by pulling the line low
* after 15us to 60us for 60us to 240us. Wait for
* 80us for the line to go low */
_delay_us(RESET_WAIT_LOW);
if(READ_PIN()) return(DS_TIMEOUT);
_delay_us(RESET_PULSE - RESET_WAIT_LOW);
if(!READ_PIN()) return(DS_TIMEOUT);
return(DS_OK);
}
