Interfacing PSOC5 CY8C5888LTI-LP097 with MAX31865

[Anonymous]

Hello,

I`m trying to communicate with MAX31865 in order to obtain data from a PT100 sensor. I have managed to send data to it but as a response it only sends FF. I am trying to read data from 00-07 addresses. Can you tell me what am I doing wrong? Thank you

[rola_264706 · Accepted solution]

I don't have your device MAX31865 so I can't try out your program. I think that your code is not correct to read the device. 

Here is Arduino code that reads this device you could modify it to the PSOC.

/**************************************************************************

* MAX31865 Basic Example

*

* Copyright (C) 2015 Ole Wolf <wolf@blazingangles.com>

*

*

* Example code that reads the temperature from an MAX31865 and outputs

* it on the serial line.

*

* Wire the circuit as follows, assuming that level converters have been

* added for the 3.3V signals:

*

* Arduino Uno --> MAX31865

* ---------------------------

* CS: pin 10 --> CS

* MOSI: pin 11 --> SDI (must not be changed for hardware SPI)

* MISO: pin 12 --> SDO (must not be changed for hardware SPI)

* SCK: pin 13 --> SCLK (must not be changed for hardware SPI)

*

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <http://www.gnu.org/licenses/>.

**************************************************************************/

#include <SPI.h>

#include <MAX31865.h>

#define RTD_CS_PIN   10

MAX31865_RTD rtd( MAX31865_RTD::RTD_PT100, RTD_CS_PIN );

void setup()

{

  Serial.begin( 115200 );

  /* Initialize SPI communication. */

  SPI.begin( );

  SPI.setClockDivider( SPI_CLOCK_DIV16 );

  SPI.setDataMode( SPI_MODE3 );

  /* Allow the MAX31865 to warm up. */

  delay( 100 );

  /* Configure:

  V_BIAS enabled

  Auto-conversion

  1-shot disabled

  3-wire enabled

  Fault detection: automatic delay

  Fault status: auto-clear

  50 Hz filter

  Low threshold: 0x0000

  High threshold: 0x7fff

  */

  rtd.configure( true, true, false, true, MAX31865_FAULT_DETECTION_NONE,

   true, true, 0x0000, 0x7fff );

}

void loop()

{

  rtd.read_all( );

  if( rtd.status( ) == 0 )

  {

   double temperature = rtd.temperature( );

  Serial.print( " T = ");

  Serial.print( temperature, 1 );

  Serial.println(" deg C" );

  }

  else

  {

  Serial.print( "RTD fault register: " );

  Serial.print( rtd.status( ) );

  Serial.print( ": " );

   if( rtd.status( ) & MAX31865_FAULT_HIGH_THRESHOLD )

  {

  Serial.println( "RTD high threshold exceeded" );

  }

   else if( rtd.status( ) & MAX31865_FAULT_LOW_THRESHOLD )

  {

  Serial.println( "RTD low threshold exceeded" );

  }

   else if( rtd.status( ) & MAX31865_FAULT_REFIN )

  {

  Serial.println( "REFIN- > 0.85 x V_BIAS" );

  }

   else if( rtd.status( ) & MAX31865_FAULT_REFIN_FORCE )

  {

  Serial.println( "REFIN- < 0.85 x V_BIAS, FORCE- open" );

  }

   else if( rtd.status( ) & MAX31865_FAULT_RTDIN_FORCE )

  {

  Serial.println( "RTDIN- < 0.85 x V_BIAS, FORCE- open" );

  }

   else if( rtd.status( ) & MAX31865_FAULT_VOLTAGE )

  {

  Serial.println( "Overvoltage/undervoltage fault");

  }

   else

  {

  Serial.println( "Unknown fault; check connection" );

  }

  }

  delay( 3000 );

}

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[rola_264706]

Here is the data sheet for the MAX31865 ;https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf

[Anonymous]

I already found some Arduino code on google before posting this, unfortunately, it does not help me cause in Cypress you need to use SPI Master library. And from your post I cannot see where you send the address to read from (this is what I`m trying to accomplish, reading data from specific slave address, the master being CY8C5888LTI).