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 lcdPrepareWrite(void)
{
CMD_WRITE();
PIN_OUT(LCD_D0);
PIN_OUT(LCD_D1);
PIN_OUT(LCD_D2);
PIN_OUT(LCD_D3);
PIN_OUT(LCD_D4);
PIN_OUT(LCD_D5);
PIN_OUT(LCD_D6);
PIN_OUT(LCD_D7);
}
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 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);
}
/**
* @brief Timeslot related events callback
* Called whenever the softdevice tries to change the original course of actions
* related to the timeslots
*/
void ts_sd_event_handler(void)
{
uint32_t evt;
SET_PIN(6);
while (sd_evt_get(&evt) == NRF_SUCCESS)
{
PIN_OUT(evt, 32);
switch (evt)
{
case NRF_EVT_RADIO_SESSION_IDLE:
timeslot_order_earliest(TIMESLOT_SLOT_LENGTH, true);
break;
case NRF_EVT_RADIO_SESSION_CLOSED:
APP_ERROR_CHECK(NRF_ERROR_INVALID_DATA);
break;
case NRF_EVT_RADIO_BLOCKED:
/* something in the softdevice is blocking our requests,
go into emergency mode, where slots are short, in order to
avoid complete lockout */
timeslot_order_earliest(TIMESLOT_SLOT_EMERGENCY_LENGTH, true);
break;
case NRF_EVT_RADIO_SIGNAL_CALLBACK_INVALID_RETURN:
APP_ERROR_CHECK(NRF_ERROR_INVALID_DATA);
break;
case NRF_EVT_RADIO_CANCELED:
timeslot_order_earliest(TIMESLOT_SLOT_LENGTH, true);
break;
default:
APP_ERROR_CHECK(NRF_ERROR_INVALID_STATE);
}
}
CLEAR_PIN(6);
}
