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sensor.temp_rh.shtc3.spin
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sensor.temp_rh.shtc3.spin
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{
--------------------------------------------
Filename: sensor.temp_rh.shtc3.spin
Author: Jesse Burt
Description: Driver for the Sensirion SHT-C3
Temperature/RH sensor
Copyright (c) 2022
Started Jul 27, 2020
Updated Dec 28, 2022
See end of file for terms of use.
--------------------------------------------
}
{ pull in methods common to all Temp/RH drivers }
#include "sensor.temp_rh.common.spinh"
CON
{ I2C }
SLAVE_WR = core#SLAVE_ADDR
SLAVE_RD = core#SLAVE_ADDR | 1
DEF_SCL = 28
DEF_SDA = 29
DEF_HZ = 100_000
' Operating modes
NORMAL = 0
LOWPOWER = 1
VAR
byte _opmode
OBJ
{ decide: Bytecode I2C engine, or PASM? Default is PASM if BC isn't specified }
#ifdef SHTC3_I2C_BC
i2c : "com.i2c.nocog" ' BC I2C engine
#else
i2c : "com.i2c" ' PASM I2C engine
#endif
core: "core.con.shtc3" ' hw-specific constants
time: "time" ' timekeeping methods
crc : "math.crc" ' crc algorithms
PUB null{}
' This is not a top-level object
PUB start{}: status
' Start using "standard" Propeller I2C pins and 100kHz
return startx(DEF_SCL, DEF_SDA, DEF_HZ)
PUB startx(SCL_PIN, SDA_PIN, I2C_HZ): status
' Start using custom I/O settings and I2C bus speed
if (lookdown(SCL_PIN: 0..31) and lookdown(SDA_PIN: 0..31) and I2C_HZ =< core#I2C_MAX_FREQ)
if (status := i2c.init(SCL_PIN, SDA_PIN, I2C_HZ))
time.usleep(core#T_POR) ' wait for device startup
reset{}
if (dev_id{} == core#DEVID_RESP) ' validate device
return status
' if this point is reached, something above failed
' Double check I/O pin assignments, connections, power
' Lastly - make sure you have at least one free core/cog
return FALSE
PUB stop{}
' Stop the driver
i2c.deinit{}
_opmode := 0
PUB defaults{}
' Set factory defaults
PUB dev_id{}: id
' Read device identification
' Returns: $0807
readreg(core#DEVID, 2, @id)
id &= $083F ' only some bits are relevant
PUB measure{}
' dummy method
PUB opmode(mode): curr_mode
' Set device operating mode
' Valid values: NORMAL (0), LOWPOWER (1)
' Any other value returns the current setting
case mode
NORMAL, LOWPOWER:
_opmode := mode
other:
return _opmode
PUB reset{}
' Reset the device
writereg(core#WAKEUP, 0, 0) ' avoid NAK from sensor when
writereg(core#RESET, 0, 0) ' sending reset
time.usleep(core#T_POR)
PUB rh_data{}: rh_adc
' Read relative humidity data
' Returns: u16
rh_adc := 0
writereg(core#WAKEUP, 0, 0) ' Wake the sensor up
time.usleep(core#T_POR)
if _opmode == NORMAL ' Take a measurement
readreg(core#NML_RHFIRST_CS, 3, @rh_adc)
elseif _opmode == LOWPOWER
readreg(core#LP_RHFIRST_CS, 3, @rh_adc)
writereg(core#SLEEP, 0, 0) ' Go back to sleep
PUB rh_word2pct(rh_word): rh_cal
' Convert RH ADC word to hundredths of a percent
' Returns: 0..100_00
return (rh_word * 100_00) / 65535
PUB temp_data{}: temp_adc | tmp
' Read temperature data
' Returns: s16
temp_adc := 0
writereg(core#WAKEUP, 0, 0) ' Wake the sensor up
time.usleep(core#T_POR)
if (_opmode == NORMAL) ' Take a measurement
readreg(core#NML_TEMPFIRST_CS, 3, @temp_adc)
elseif (_opmode == LOWPOWER)
readreg(core#LP_TEMPFIRST_CS, 3, @temp_adc)
writereg(core#SLEEP, 0, 0) ' Go back to sleep
PUB temp_word2deg(temp_word): temp_cal
' Convert temperature ADC word to degrees
' Returns: hundredths of a degree, in chosen scale
case _temp_scale
C:
return ((175 * (temp_word * 100)) / 65535)-45_00
F:
return ((315 * (temp_word * 100)) / 65535)-49_00
other:
return FALSE
PRI readreg(reg_nr, nr_bytes, ptr_buff) | cmd_pkt, tmp, crc_r
' Read nr_bytes from the slave device into ptr_buff
tmp := 0
case reg_nr ' validate reg num
$44DE, $5C24, $6458, $7CA2: ' meas. with clock-stretching
cmd_pkt.byte[0] := SLAVE_WR
cmd_pkt.byte[1] := reg_nr.byte[1]
cmd_pkt.byte[2] := reg_nr.byte[0]
i2c.start{} ' Send measurement command
i2c.wrblock_lsbf(@cmd_pkt, 3)
i2c.stop{}
i2c.start{} ' read measurement
i2c.write(SLAVE_RD)
i2c.rdblock_msbf(@tmp, nr_bytes, i2c#NAK)
i2c.stop{}
crc_r := tmp.byte[0] ' crc read in for data
tmp >>= 8 ' chop it off of the data
if crc.sensirion_crc8(@tmp, 2) == crc_r
long[ptr_buff] := tmp
$401A, $58E0, $609C, $7866: ' meas. without clock-stretch
cmd_pkt.byte[0] := SLAVE_WR
cmd_pkt.byte[1] := reg_nr.byte[1]
cmd_pkt.byte[2] := reg_nr.byte[0]
i2c.start{}
i2c.wrblock_lsbf(@cmd_pkt, 3)
i2c.stop{}
i2c.wait(SLAVE_RD)
i2c.rdblock_msbf(@tmp, nr_bytes, i2c#NAK)
i2c.stop{}
time.msleep(1)
crc_r := tmp.byte[0] ' crc read in for data
tmp >>= 8 ' chop it off of the data
if crc.sensirion_crc8(@tmp, 2) == crc_r
long[ptr_buff] := tmp
core#DEVID:
cmd_pkt.byte[0] := SLAVE_WR
cmd_pkt.byte[1] := reg_nr.byte[1]
cmd_pkt.byte[2] := reg_nr.byte[0]
i2c.start{}
i2c.wrblock_lsbf(@cmd_pkt, 3)
i2c.stop{}
i2c.start{}
i2c.write(SLAVE_RD)
i2c.rdblock_msbf(@tmp, 3, i2c#NAK)
i2c.stop{}
crc_r := tmp.byte[0] ' crc read in for data
tmp >>= 8 ' chop it off of the data
if crc.sensirion_crc8(@tmp, 2) == crc_r
long[ptr_buff] := tmp
other:
return
PRI writereg(reg_nr, nr_bytes, ptr_buff) | cmd_pkt
' Write nr_bytes to the slave device from ptr_buff
case reg_nr
core#WAKEUP, core#RESET, core#SLEEP:
cmd_pkt.byte[0] := SLAVE_WR
cmd_pkt.byte[1] := reg_nr.byte[1]
cmd_pkt.byte[2] := reg_nr.byte[0]
i2c.start{}
i2c.wrblock_lsbf(@cmd_pkt, 3)
i2c.stop{}
other:
return
DAT
{
Copyright 2022 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.
}