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:
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