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SHT3x-ThreshIntDemo.spin2
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SHT3x-ThreshIntDemo.spin2
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{
----------------------------------------------------------------------------------------------------
Filename: SHT3x-ThreshIntDemo.spin2
Description: Demo of the SHT3x driver
* Threshold interrupt functionality
Author: Jesse Burt
Started: Nov 19, 2017
Updated: Aug 29, 2024
Copyright (c) 2024 - See end of file for terms of use.
----------------------------------------------------------------------------------------------------
}
CON
_clkfreq = 180_000_000
_xtlfreq = 20_000_000
' -- User-modifiable constants
INT1 = 3 ' ALERT pin (active high)
' --
OBJ
ser: "com.serial.terminal.ansi" | SER_BAUD=2_000_000
sensor: "sensor.temp_rh.sht3x" | SCL=0, SDA=1, I2C_FREQ=400_000, I2C_ADDR=0, RST=2
VAR
long _isr_stack[50] ' stack for ISR core
long _intflag ' interrupt flag
PUB main() | dr, temp, rh
setup()
dr := 2 ' data rate: 0 (0.5), 1, 2, 4, 10Hz
sensor.temp_scale(sensor.C) ' C, F
sensor.rh_int_hi_thresh(25) ' RH hi/lo thresholds
sensor.rh_int_lo_thresh(5)
sensor.rh_int_hi_hyst(24) ' hi/lo thresh hysteresis
sensor.rh_int_lo_hyst(6)
sensor.temp_int_hi_thresh(30) ' temp hi/lo thresholds
sensor.temp_int_lo_thresh(10)
sensor.temp_int_hi_hyst(29) ' hi/lo thresh hysteresis
sensor.temp_int_lo_hyst(7)
ser.strln(@"Set thresholds:")
ser.printf(@"RH Set low: %d hi: %d\n\r", sensor.rh_int_lo_thresh(), ...
sensor.rh_int_hi_thresh())
ser.printf(@"RH Clear low: %d hi: %d\n\r", sensor.rh_int_lo_hyst(), ...
sensor.rh_int_hi_hyst())
ser.printf(@"Temp Set low: %d hi: %d\n\r", sensor.temp_int_lo_thresh(), ...
sensor.temp_int_hi_thresh())
ser.printf(@"Temp Clear low: %d hi: %d\n\r", sensor.temp_int_lo_hyst(), ...
sensor.temp_int_hi_hyst())
repeat
if ( dr > 0 )
waitms(1000/dr)
else
waitms(2000)
temp := sensor.temperature()
rh := sensor.rh()
ser.pos_xy(0, 10)
ser.printf(@"Temperature: %3.3d.%02.2d\n\r", (temp / 100), abs(temp // 100))
ser.printf(@"Relative humidity: %3.3d.%02.2d%%\n\r", (rh / 100), (rh // 100))
if ( _intflag )
ser.pos_xy(0, 12)
ser.str(@"Interrupt")
else
ser.pos_xy(0, 12)
ser.clear_line()
PRI isr()
' Interrupt service routine
pinf(INT1) ' INT1 as input
repeat
repeat until pinr(INT1) == 1 ' wait for INT1 (active high)
_intflag := 1 ' set flag
repeat until pinr(INT1) == 0 ' now wait for it to clear
_intflag := 0 ' clear flag
PUB setup()
ser.start()
ser.clear()
ser.strln(@"Serial terminal started")
if ( sensor.start() )
ser.strln(@"SHT3x driver started")
else
ser.strln(@"SHT3x driver failed to start - halting")
repeat
cogspin(NEWCOG, isr(), @_isr_stack) ' start ISR in another core
DAT
{
Copyright 2024 Jesse Burt
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
}