NAME

       max31855 - Support for the MAX31855 Thermocouple-to-Digital converter using bitbanged spi

SYNOPSIS

       loadrt max31855 [count=N|names=name1[,name2...]] [personality=P,P,...]

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