/**
* read bytes from uart with timeout ms
*/
int suli_uart_read_bytes_timeout(UART_T *uart, uint8_t *buff, int len, int timeout_ms)
{
uint8_t *ptr = buff;
uint8_t *end = ptr + len;
uint32_t t = suli_millis();
while (ptr != end)
{
if ((suli_millis() - t) > timeout_ms) break;
int c = serial_getc(uart);
*ptr++ = c;
}
return ptr - buff;
}
bool GroveTempHumPro::_read(IO_T *io)
{
uint8_t laststate = SULI_HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
unsigned long currenttime;
// pull the pin high and wait 250 milliseconds
//digitalWrite(_pin, SULI_HIGH);
//suli_pin_write(io, SULI_HIGH);
//suli_delay_ms(250);
currenttime = suli_millis();
if (currenttime < _lastreadtime)
{
// ie there was a rollover
_lastreadtime = 0;
}
if (!firstreading && ((currenttime - _lastreadtime) < 2000))
{
return true; // return last correct measurement
//delay(2000 - (currenttime - _lastreadtime));
}
firstreading = false;
_lastreadtime = suli_millis();
data[0] = data[1] = data[2] = data[3] = data[4] = 0;
// now pull it low for ~20 milliseconds
//pinMode(_pin, OUTPUT);
suli_pin_dir(io, SULI_OUTPUT);
//digitalWrite(_pin, LOW);
suli_pin_write(io, SULI_LOW);
suli_delay_ms(20);
//cli();
//digitalWrite(_pin, SULI_HIGH);
suli_pin_write(io, SULI_HIGH);
//delayMicroseconds(40);
suli_delay_us(40);
//pinMode(_pin, INPUT);
suli_pin_dir(io, SULI_INPUT);
// read in timings
for (i = 0; i < MAXTIMINGS; i++)
{
counter = 0;
//while (digitalRead(_pin) == laststate) {
while (suli_pin_read(io) == laststate)
{
counter++;
//delayMicroseconds(1);
suli_delay_us(1);
if (counter == 255)
{
break;
}
}
//laststate = digitalRead(&_pin);
laststate = suli_pin_read(io);
if (counter == 255) break;
// ignore first 3 transitions
if ((i >= 4) && (i % 2 == 0))
{
// shove each bit into the storage bytes
data[j / 8] <<= 1;
if (counter > _count) //
data[j / 8] |= 1;
j++;
}
}
// check we read 40 bits and that the checksum matches
if ((j >= 40) &&
(data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)))
{
return true;
}
return false;
}
/*
* delay ms
*/
void suli_delay_ms(uint32 ms)
{
uint64 mark_time = suli_millis();
while(suli_millis() - mark_time < ms);
}
