SPI Problem Arduino Mega with pressure sensor MS5803-05BA - arduino

Question

I need your help for a project.
I have actually 2 parallel sensors of the type: MS5803-05BA, which supports I2C and SPI connection. One sensor is on I2C bus and one sensor is on SPI. They are both sending to my Arduino Mega. The I2C works perfect with short cables.
Here the datasheet of the sensor:
https://www.amsys.de/downloads/data/MS5803-05BA-AMSYS-datasheet.pdf
For some informations who wants to do the same with I2C. Here you can find a good code. (You can find the other MS580X typs there too). For the communication between the sensor and the Arduino Mega you need an logic converter like this txs0108e, which can be bought with a break out board (you need pull up resistors on the sensor side!):
https://github.com/millerlp/MS5803_05
But to my problem: I have an sensor distance for about 3-5 meters and the I2C connections doesnt work. Yes I can try to fix the pullup resistors but it doesnt worked for me (I have tried some different lower resistors between 3-10kOhm). Therefore I want to switch to the SPI bus.
I have edit the code from https://github.com/millerlp/MS5803_05, https://github.com/vic320/Arduino-MS5803-14BA and https://arduino.stackexchange.com/questions/13720/teensy-spi-and-pressure-sensor.
The File is added. (You have to put the .h and .cpp files in the folder of the arduino code (.spi).
I have problems with the code from the SPI (ccp and header). There is no right communication. I have checked my cables twice. I couldnt find a problem and the connection with the txs0108e works for parallel I2C sensor. Both sensors are working on I2C.
Here is the main code (arduino .spi) for SPI and I2C parallel:
/_____ I N C L U D E S
#include <stdio.h>
#include <math.h>
#include <SPI.h>
#include <Wire.h>
#include "MS5803_05.h"
#include "MS5803_05_SPI.h"
const int miso_port = 50; //SDI
const int mosi_port = 51; //SDO
const int sck_port = 52; //SLCK
const int slaveSelectPin = 53; // CSB
MS_5803 sensor = MS_5803(512);
MS_5803_SPI sensor_spi = MS_5803_SPI(4096, slaveSelectPin);
void setup()
{
pinMode(miso_port, INPUT);
pinMode(mosi_port, OUTPUT);
pinMode(slaveSelectPin, OUTPUT);
pinMode(sck_port, OUTPUT);
Serial.begin(9600);
//SPI BUS
if (sensor_spi.initializeMS_5803_SPI()) {
Serial.println( "MS5803 SPI CRC check OK." );
}
else {
Serial.println( "MS5803 SPI CRC check FAILED!" );
}
//I2C BUS
delay(1000);
if (sensor.initializeMS_5803()) {
Serial.println( "MS5803 I2C CRC check OK." );
}
else {
Serial.println( "MS5803 I2C CRC check FAILED!" );
}
}
void loop()
{
Serial.println("SPI Sensor first pressure [mbar], than temperature[°C]:");
sensor_spi.readSensor();
// Show pressure
Serial.print("Pressure = ");
Serial.print(sensor_spi.pressure());
Serial.println(" mbar");
// Show temperature
Serial.print("Temperature = ");
Serial.print(sensor_spi.temperature());
Serial.println("C");
////********************************************************
Serial.println("");
Serial.println("I2C Sensor first pressure [mbar], than temperature[°C]:");
sensor.readSensor();
// Show pressure
Serial.print("Pressure = ");
Serial.print(sensor.pressure());
Serial.println(" mbar");
// Show temperature
Serial.print("Temperature = ");
Serial.print(sensor.temperature());
Serial.println("C");
delay(2000);
}
}
The first connection with SPI is here (.cpp):
#include "MS5803_05_SPI.h"
#include <SPI.h>
#define CMD_RESET 0x1E // ADC reset command
#define CMD_ADC_READ 0x00 // ADC read command
#define CMD_ADC_CONV 0x40 // ADC conversion command
#define CMD_ADC_D1 0x00 // ADC D1 conversion
#define CMD_ADC_D2 0x10 // ADC D2 conversion
#define CMD_ADC_256 0x00 // ADC resolution=256
#define CMD_ADC_512 0x02 // ADC resolution=512
#define CMD_ADC_1024 0x04 // ADC resolution=1024
#define CMD_ADC_2048 0x06 // ADC resolution=2048
#define CMD_ADC_4096 0x08 // ADC resolution=4096
#define CMD_PROM_RD 0xA0 // Prom read command
#define spi_write SPI_MODE3
#define spi_write2 SPI_MODE1
// Create array to hold the 8 sensor calibration coefficients
static unsigned int sensorCoeffs[8]; // unsigned 16-bit integer (0-65535)
// D1 and D2 need to be unsigned 32-bit integers (long 0-4294967295)
static uint32_t D1 = 0; // Store uncompensated pressure value
static uint32_t D2 = 0; // Store uncompensated temperature value
// These three variables are used for the conversion steps
// They should be signed 32-bit integer initially
// i.e. signed long from -2147483648 to 2147483647
static int32_t dT = 0;
static int32_t TEMP = 0;
// These values need to be signed 64 bit integers
// (long long = int64_t)
static int64_t Offset = 0;
static int64_t Sensitivity = 0;
static int64_t T2 = 0;
static int64_t OFF2 = 0;
static int64_t Sens2 = 0;
// Some constants used in calculations below
const uint64_t POW_2_33 = 8589934592ULL; // 2^33 = 8589934592
SPISettings settings_write(500000, MSBFIRST, spi_write);
SPISettings settings_write2(500000, MSBFIRST, spi_write2);
//-------------------------------------------------
// Constructor
MS_5803_SPI::MS_5803_SPI( uint16_t Resolution, uint16_t cs) {
// The argument is the oversampling resolution, which may have values
// of 256, 512, 1024, 2048, or 4096.
_Resolution = Resolution;
//Chip Select
_cs=cs;
}
boolean MS_5803_SPI::initializeMS_5803_SPI(boolean Verbose) {
digitalWrite( _cs, HIGH );
SPI.begin();
// Reset the sensor during startup
resetSensor();
if (Verbose)
{
// Display the oversampling resolution or an error message
if (_Resolution == 256 | _Resolution == 512 | _Resolution == 1024 | _Resolution == 2048 | _Resolution == 4096){
Serial.print("Oversampling setting: ");
Serial.println(_Resolution);
} else {
Serial.println("*******************************************");
Serial.println("Error: specify a valid oversampling value");
Serial.println("Choices are 256, 512, 1024, 2048, or 4096");
Serial.println("*******************************************");
}
}
// Read sensor coefficients
for (int i = 0; i < 8; i++ )
{
SPI.beginTransaction(settings_write2);
digitalWrite(_cs, LOW); //csb_lo(); // pull CSB low
unsigned int ret;
unsigned int rC = 0;
SPI.transfer(CMD_PROM_RD + i * 2); // send PROM READ command
/*
ret = SPI.transfer(0x00); // send 0 to read the MSB
rC = 256 * ret;
ret = SPI.transfer(0x00); // send 0 to read the LSB
rC = rC + ret;
*/
// send a value of 0 to read the first byte returned:
rC = SPI.transfer( 0x00 );
rC = rC << 8;
rC |= SPI.transfer( 0x00 ); // and the second byte
sensorCoeffs[i] = (rC);
digitalWrite( _cs, HIGH );
delay(3);
}
//SPI.endTransaction(); // interrupt can now be accepted
// The last 4 bits of the 7th coefficient form a CRC error checking code.
unsigned char p_crc = sensorCoeffs[7];
// Use a function to calculate the CRC value
unsigned char n_crc = MS_5803_CRC(sensorCoeffs);
if (Verbose) {
for (int i = 0; i < 8; i++ )
{
// Print out coefficients
Serial.print("C");
Serial.print(i);
Serial.print(" = ");
Serial.println(sensorCoeffs[i]);
delay(10);
}
Serial.print("p_crc: ");
Serial.println(p_crc);
Serial.print("n_crc: ");
Serial.println(n_crc);
}
// If the CRC value doesn't match the sensor's CRC value, then the
// connection can't be trusted. Check your wiring.
if (p_crc != n_crc) {
return false;
}
// Otherwise, return true when everything checks out OK.
return true;
}
// Sends a power on reset command to the sensor.
void MS_5803_SPI::resetSensor() {
SPI.beginTransaction(settings_write);
digitalWrite(_cs, LOW); //csb_lo(); // pull CSB low to start the command
SPI.transfer(CMD_RESET); // send reset sequence
delay(3); // wait for the reset sequence timing delay(3)
digitalWrite(_cs, HIGH); //csb_hi(); // pull CSB high to finish the command
SPI.endTransaction(); // interrupt can now be accepted
}
The Code can be downloaded at: https://forum.arduino.cc/index.php?topic=670661.0
There you can find the schematic and output picture too.
Thanks a lot :).