Man page - max31855(9)
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apt-get install linuxcnc-uspace
Manual
MAX31855
NAMESYNOPSIS
DESCRIPTION
FUNCTIONS
PINS
AUTHOR
LICENSE
NAME
max31855 - Support for the MAX31855 Thermocouple-to-Digital converter using bitbanged spi
SYNOPSIS
|
loadrt max31855 [count= N |names= name1 [, name2... ]] [personality= P1,P2,... ] |
DESCRIPTION
The component requires at least 3 pins to bitbang spi protocol, for example:
loadrt max31855 personality=1
setp
hm2_6i25.0.gpio.023.is_output true
setp hm2_6i25.0.gpio.024.is_output true
net
spi.clk.in hm2_6i25.0.gpio.023.out max31855.0.clk.out
net spi.cs.in hm2_6i25.0.gpio.024.out max31855.0.cs.out
net spi.data0.in hm2_6i25.0.gpio.033.in_not
max31855.0.data.0.in
addf max31855.0.bitbang-spi servo-thread
The MAX31855 supports a range of -270C to 1800C, however linearization data is only available for the -200C to 1350C range, beyond which raw temperature is returned.
Temperature pins are provided for readings in Celsius, Fahrenheit and Kelvin, temperature values are not updated while a fault condition is present.
The personality parameter is used to indicate the number of sensors. Multiple sensors share the clk and cs pins, but connect to discrete data input pins. A maximum of 15 sensors are supported.
FUNCTIONS
max31855. N .bitbang-spi (requires a floating-point thread)
PINS
max31855. N .data. M .in bit in (M=0..( personality & 0xf ))
Pin(s) connected to data out.
max31855. N .cs.out bit out
Pin connected to cs, pulled low to shift data, pulled high for data refresh.
max31855. N .clk.out bit out
Pin connected to clk.
max31855. N .temp-celsius. M float out (M=0..( personality & 0xf ))
Temperature output values in Celsius.
max31855. N .temp-fahrenheit. M float out (M=0..( personality & 0xf ))
Temperature in Fahrenheit.
max31855. N .temp-kelvin. M float out (M=0..( personality & 0xf ))
Temperature in Kelvin.
max31855. N .fault. M bit out (M=0..( personality & 0xf ))
Fault condition detected.
max31855. N .fault-flags. M u32 out (M=0..( personality & 0xf ))
Fault flags: 0x1 = open sensor, 0x2 short to gnd, 0x3 short to vcc.
AUTHOR
Joseph Calderon
LICENSE
GPL