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TCS3x7x-ThreshIntDemo.spin2
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TCS3x7x-ThreshIntDemo.spin2
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{
----------------------------------------------------------------------------------------------------
Filename: TCS3x7x-ThreshIntDemo.spin2
Description: Demo of the TCS3x7x driver
* Threshold interrupt functionality
Author: Jesse Burt
Started: Jan 6, 2022
Updated: Jun 2, 2024
Copyright (c) 2024 - See end of file for terms of use.
----------------------------------------------------------------------------------------------------
}
CON
_clkfreq = cfg._clkfreq_def
_xtlfreq = cfg._xtlfreq
' -- User-modifiable constants
INT1 = 2 ' pin connected to TCS3x7x's INT1 pin
WH_LED = 3 ' pin connected to an (optional) white LED
' --
OBJ
cfg: "boardcfg.p2eval"
ser: "com.serial.terminal.ansi" | SER_BAUD=2_000_000
rgb: "sensor.light.tcs3x7x" | SCL=0, SDA=1, I2C_FREQ=400_000
VAR
long _isr_stack[50] ' stack for ISR core
long _intflag ' interrupt flag
PUB main()
pinl(WH_LED)
setup()
rgb.preset_active() ' default settings, but enable
' sensor power
rgb.int_clear() ' clear potential false int
rgb.int_ena(true)
rgb.int_set_lo_thresh(0)
rgb.int_set_hi_thresh(15) ' (low, high): 0..65535
rgb.int_duration(10) ' 0..3, 5..60 (in steps of 5)
' Wait for the sensor to read less than the low threshold or greater than
' the high threshold. int_duration() sets the number of measurement cycles
' the readings must be outside of the thresholds in order to assert an
' interrupt, to reduce false positives. See the driver for details.
' NOTE: The interrupt applies only to the _white_ color channel
' NOTE: The interrupt is active low, and open drain, so requires a pullup
' resistor
repeat
if (_intflag)
ser.pos_xy(0, 8)
ser.strln(@"interrupt - press any key to clear")
ser.getchar()
rgb.int_clear()
ser.pos_xy(0, 8)
ser.clear_line()
ser.pos_xy(0, 3)
ser.printf(@"White: %4.4x\n\r", rgb.white_data())
ser.printf(@"Red: %4.4x\n\r", rgb.red_data())
ser.printf(@"Green: %4.4x\n\r", rgb.green_data())
ser.printf(@"Blue: %4.4x\n\r", rgb.blue_data())
PRI isr()
' Interrupt service routine
pinf(INT1) ' INT1 as input
repeat
repeat until pinr(INT1) == 0 ' wait for INT1 (active low)
_intflag := 1 ' set flag
repeat until pinr(INT1) == 1 ' now wait for it to clear
_intflag := 0 ' clear flag
PUB setup()
ser.start()
ser.clear()
ser.strln(@"Serial terminal started")
if ( rgb.start() )
ser.strln(@"TCS3X7X driver started")
else
ser.strln(@"TCS3X7X 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.
}