max318559
Support for the max31855 thermocouple-to-digital converter using bitbanged spi
Usage
loadrt max31855 [count=N|names=name1[,name2...]] [personality=P1,P2,...]
Overview
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. |
Releases
2 releases since Debian 12 (Bookworm); the text changed 1 time.