MAX31865

waranet · Joined: 05 Jan 2006 Posts: 10 Location: France

Hello, I'm looking for a sample of code to handle a MAX31865, I own the EV Kit and this RTD converter seems to be very interesting.
Your help will be very appreciated.
regards
JP

asmboy · Joined: 20 Nov 2007 Posts: 2128 Location: albany ny

what is your circuit schematic?
can you show it?
what code have you written and where did you get stuck?
summary: what effort have you put in to this project?

waranet · Joined: 05 Jan 2006 Posts: 10 Location: France

Hi, the schematic is quiet simple, pic 18lf2523 + ds1337 + 24lc1025 + 20 MHz quartz + ftdi for usb connection... and Max 31865 for the RTD sensor.
Everything is ok with RTC, memory, usb connection. What I'm looking for is only a small sample to save time, library or/and C code.
Thanks for your help.
Rgds.

temtronic · Posted: Wed Jun 18, 2014 5:18 am

The device is a 'regular' SPI mode 1 or 3 peripheral and the datasheet is well laidout so cutting your own driver should be fairly easy.
Obviously start with ONLY that device and a PC terminal link(for display purposes). Simple write/read the control registers confirming it exists and you can 'diddle bits'. After that,create an init_function and a simple read/display main loop,add RTD and heat/cool it, seeing data on PC screen.
If you 'google' you will find code cut for 'other' ucomputers/compilers.Simply see how/what they're doing and convert into CCS C code.
Basic driver should take a night or two...depending on required features a modest driver a couple more night.Full blown,feature packed driver should take a weeks labour.

Without a device to properly test I can't cut a driver as there's always something I misread or some errata to deal with.

hth
jay

waranet · Joined: 05 Jan 2006 Posts: 10 Location: France

Thanks a lot temtronic, in fact the difficulty will be to find some free nights...
rgds
JP

ezflyr · Joined: 25 Oct 2010 Posts: 1019 Location: Tewksbury, MA

Bonjour,

I have not looked at the datasheet for the MAX31865 device, but I'd be very surprised if there wasn't some commonality with the MAX31855 thermocouple interface IC. I think there are some routines for this IC in the archives, or I can send you some as a starting off point.

John

waranet · Joined: 05 Jan 2006 Posts: 10 Location: France

I found this topic ... http://www.mikrocontroller.net/topic/298869
This code is for AVR but seems to be easy to translate for Pic.

I guess I can sleep now.
rgds,
JP