Posts made by Powersoft

Powersoft

I need to connect SDC40 from M5Stack to the TAB5. Wich port is the one to use to connect the SCD40.

Is there an example how to use the I2C with the TAB5

Powersoft

@felmue Thanks for this, please can you post an simple example that works with the changes in the example you mentiod to get it run on the Tab5. That wil be great.

Powersoft

I wont to make a hardcopy of my screen, and store it on the sd-card. Has someone have done this? I know from the past on the M5Paper this was done, now I wont to do this on the Core-2

Powersoft

@felmue often I use Serial.printf() function, with 90% of my application have the result I wanted! Also add the text background collor as the collor of the screen.

Powersoft

Hello,

Load the Arduino envoirment on a brand new MacBook Pro.
Try to compile The Core2 and the M5Stack fire.

Now I get the message : No module named serial.
On the system is the latest version of python installed.

What to do?

File "/Users/jankromhout/Library/Arduino15/packages/m5stack/tools/esptool_py/3.0.0/esptool.py", line 39, in <module>
import serial
ImportError: No module named serial
exit status 1
Fout bij het compileren voor board M5Stack-FIRE

Powersoft

Found the problem. After deleting an old sdfat and installing a new one it was working perfect on my Core2.
Thanks for hiis fine explanation. Was verry helpfull.

Cheers
Jan

Powersoft

Hello, try to compile the first example file and got the error
in thus part:

SdFat32 sd; // for FAT16/FAT32
File32 file;
File32 root;

exit status 1
'File32' does not name a type

do I need to delte file?

Thanks for any help.
Cheers
Jan

Powersoft

Is it possible to read/write blocks of 512 bytes direct to the sd card?
This without using the M5Stack filesystem.
I know with the SDFat.h library it is possible, there are commands for readBlock(block,buffer) and writeBlock(block, buffer), and buffer is defined as
byte buffer[512].
But I get not compiled this library under my Core2.
Appreciatie any help with this.

Cheers,
Jan

Powersoft

Is it posible to use the stepper module wihout the gcode?
Command the stepper on a direct way to do some steps.

Cheers Jan

Powersoft

That is no problem, must do some changes because some parts are in my native language, Dutch. But I have no clou how to set my program zipped on the forum.

Powersoft

Thanks Paul for this tool, it is working great.!!

![0_1615906292910_screen.bmp](Uploading 57%)

Powersoft

Hello,

Should I prepare something in the your program to get it running?
I have hang in the procedure at the en of my refresh to the screen, start it but notting happens!
Where can I find the output of the log statement?

Cheers,
Jan

Powersoft

Are you thinking using an API Call like calling open weather map? I use OWM api to get the weather forecast on my M5Stack. Use alo a kind of marque to present the data 4 times in a hour, an when pushing the B-button. Make also graphs, when pushing the A-button.

Cheers,
Jan

Powersoft

Can I use the SPIFFS on the M5StackCore2, or do I need to install something in advance? I use #include "SPIFFS.h.

Cheers,

Jan

Powersoft

Make an improvement in the main call routine. The return value of getBME280 is a boolean.
now it is possible to check whether a BME280 is connected correctly.

bool getBME280(TwoWire *theWire, double *t, double *p, double *h)
{
  _i2c = theWire;

  /* check of BME280 is avilable */
  uint8_t value = read8(0xD0);  
  if (value == 0x60)                                    // BME280 detected
  {
    reset_BME280();                                     // Reset BME280      
    write8(BME280_REGISTER_CONTROLHUMID,(uint8_t)0x01); // Select control humidity register
    write8(BME280_REGISTER_CONTROL,     (uint8_t)0x27); // Select control measurement register
    write8(BME280_REGISTER_CONFIG,      (uint8_t)0xA0); // Select config register
    readCoefficients();                                 // Read coefficients from BME280
    *t = get_Temperature();                             // Get temperature
    *p = get_Pressure()/100.0;                          // Get pressure
    *h = get_Humidity();                                // Get Humidity
    return true;
  }
  else
  {
    return false;                                       // No BME280 detected
  }
}

Cheers,

Jan

Powersoft

Because the BME280 library didn't want to work with the M5Paper Wire1 I2c connection, I changed the routines so that they now work.

The adjustment now works for M5Stack, the M5Paper and for the Core2.
I post the complete code here, because I cannot upload a zip file.
he whole consists of:

M5Paper_BME280.uno
BME280.h
BME280_routines

1. M5Paper_BME280.uno

/*
 * BME280 Sensor (Temperature,Pressure, and Humidity) 
 * Is working now also for M5Paper, and testest on all M5Stack devices
 * Rewritten by J.Kromhout (NL)
 * Version 1.0
 * Date : 24-02-2021
 * 
 * Todo:  Beter input for smapling etc.
 *        Making the routine universal for BME280 and BMP280
 */

#include <M5EPD.h>
#include <Wire.h>

#include "BME280.h" /* definition file */

double p,t,h; /* pressure,temperature and humidity */

void setup() {
  M5.begin();
  Wire1.begin(25,32); /* start Wire1 on M5Paper */
  getBME280(&Wire1, &t, &p, &h); /* get messurment*/
  Serial.println("-------------------------");
  Serial.printf("Temperature : %6.1f °C\n",   t);
  Serial.printf("Barometer   : %6.1f hPa\n",  p);
  Serial.printf("Humidity    : %6.1f %%\n",   h);
  Serial.println("-------------------------");
}

void loop() {
  // put your main code here, to run repeatedly:

}


void getBME280(TwoWire *theWire, double *t, double *p, double *h)
{
  _i2c = theWire;

  /* check of BME280 is avilable */
  uint8_t value = read8(0xD0);  
  if (value == 0x60)
    Serial.println("BME280 found");
  else
  {
    Serial.println("No BME280 found! Check your device........");
    while(true);
  }
  reset_BME280();                                     // Reset BME280      
  write8(BME280_REGISTER_CONTROLHUMID,(uint8_t)0x01); // Select control humidity register
  write8(BME280_REGISTER_CONTROL,     (uint8_t)0x27); // Select control measurement register
  write8(BME280_REGISTER_CONFIG,      (uint8_t)0xA0); // Select config register
  readCoefficients();                                 // Read coefficients from BME280
  *t = get_Temperature();                             // Get temperature
  *p = get_Pressure()/100.0;                          // Get pressure
  *h = get_Humidity();                                // Get Humidity
}

2. BME280.h

#define BME280_ADDRESS 0x77  /* Primary I2C Address */
TwoWire *_i2c;
uint8_t _i2caddr = BME280_ADDRESS;


int32_t t_fine; /* tempory variable */

/* calibration data, need for calculation */
uint16_t  dig_T1; 
int16_t   dig_T2;  
int16_t   dig_T3;  

uint16_t  dig_P1; 
int16_t   dig_P2;  
int16_t   dig_P3;  
int16_t   dig_P4;  
int16_t   dig_P5;  
int16_t   dig_P6;  
int16_t   dig_P7;  
int16_t   dig_P8; 
int16_t   dig_P9;  

uint8_t   dig_H1; 
int16_t   dig_H2; 
uint8_t   dig_H3; 
int16_t   dig_H4; 
int16_t   dig_H5; 
int8_t    dig_H6;  

/* Calibrate registers addresses */
#define BME280_REGISTER_DIG_T1        0x88
#define BME280_REGISTER_DIG_T2        0x8A
#define BME280_REGISTER_DIG_T3        0x8C
#define BME280_REGISTER_DIG_P1        0x8E
#define BME280_REGISTER_DIG_P2        0x90
#define BME280_REGISTER_DIG_P3        0x92
#define BME280_REGISTER_DIG_P4        0x94
#define BME280_REGISTER_DIG_P5        0x96
#define BME280_REGISTER_DIG_P6        0x98
#define BME280_REGISTER_DIG_P7        0x9A
#define BME280_REGISTER_DIG_P8        0x9C
#define BME280_REGISTER_DIG_P9        0x9E
#define BME280_REGISTER_DIG_H1        0xA1
#define BME280_REGISTER_DIG_H2        0xE1
#define BME280_REGISTER_DIG_H3        0xE3
#define BME280_REGISTER_DIG_H4        0xE4
#define BME280_REGISTER_DIG_H5        0xE5
#define BME280_REGISTER_DIG_H6        0xE7
/* ontrol registers */
#define BME280_REGISTER_CHIPID        0xD0
#define BME280_REGISTER_VERSION       0xD1
#define BME280_REGISTER_SOFTRESET     0xE0
#define BME280_REGISTER_CAL26         0xE1 
#define BME280_REGISTER_CONTROLHUMID  0xF2
#define BME280_REGISTER_STATUS        0xF3
#define BME280_REGISTER_CONTROL       0xF4
#define BME280_REGISTER_CONFIG        0xF5
#define BME280_REGISTER_PRESSUREDATA  0xF7
#define BME280_REGISTER_TEMPDATA      0xFA
#define BME280_REGISTER_HUMIDDATA     0xFD

3. BME280_routines

uint8_t read8(byte reg) 
{
  uint8_t value;
  _i2c->beginTransmission((uint8_t)BME280_ADDRESS);
  _i2c->write((uint8_t)reg);
  _i2c->endTransmission();
  _i2c->requestFrom((uint8_t)BME280_ADDRESS,(uint8_t)1);
  value = _i2c->read();
  return value;
}
    
void write8(byte reg , byte value) 
{
  _i2c->beginTransmission((uint8_t)BME280_ADDRESS);
  _i2c->write((uint8_t)reg);
  _i2c->write((uint8_t)value);
  _i2c->endTransmission();
}

uint16_t read16(byte reg) 
{
  uint16_t value;
  _i2c->beginTransmission((uint8_t) BME280_ADDRESS);
  _i2c->write((uint8_t)reg);
  _i2c->endTransmission();
  _i2c->requestFrom((uint8_t)BME280_ADDRESS,(uint8_t)2);
  value = (_i2c->read() << 8) | _i2c->read();
  return value;
}

uint32_t read24(byte reg) 
{
  uint32_t value;
    _i2c->beginTransmission((uint8_t)BME280_ADDRESS);
    _i2c->write((uint8_t)reg);
    _i2c->endTransmission();
    _i2c->requestFrom((uint8_t)BME280_ADDRESS,(uint8_t)3);

    value = _i2c->read();
    value <<= 8;
    value |= _i2c->read();
    value <<= 8;
    value |= _i2c->read();
    return value;
}

uint16_t read16_LE(byte reg) 
{
  uint16_t temp = read16(reg);
  return (temp >> 8) | (temp << 8);
}

int16_t readS16(byte reg) 
{ 
  return (int16_t) read16(reg); 
}

int16_t readS16_LE(byte reg) 
{
  return (int16_t) read16_LE(reg);
}

void readCoefficients() 
{
  dig_T1  = read16_LE(BME280_REGISTER_DIG_T1);
  dig_T2  = readS16_LE(BME280_REGISTER_DIG_T2);
  dig_T3  = readS16_LE(BME280_REGISTER_DIG_T3);

  dig_P1  = read16_LE(BME280_REGISTER_DIG_P1);
  dig_P2  = readS16_LE(BME280_REGISTER_DIG_P2);
  dig_P3  = readS16_LE(BME280_REGISTER_DIG_P3);
  dig_P4  = readS16_LE(BME280_REGISTER_DIG_P4);
  dig_P5  = readS16_LE(BME280_REGISTER_DIG_P5);
  dig_P6  = readS16_LE(BME280_REGISTER_DIG_P6);
  dig_P7  = readS16_LE(BME280_REGISTER_DIG_P7);
  dig_P8  = readS16_LE(BME280_REGISTER_DIG_P8);
  dig_P9  = readS16_LE(BME280_REGISTER_DIG_P9);

  dig_H1 = read8(BME280_REGISTER_DIG_H1);
  dig_H2 = readS16_LE(BME280_REGISTER_DIG_H2);
  dig_H3 = read8(BME280_REGISTER_DIG_H3);
  dig_H4 = ((int8_t)read8(BME280_REGISTER_DIG_H4) << 4) | (read8(BME280_REGISTER_DIG_H4 + 1) & 0xF);
  dig_H5 = ((int8_t)read8(BME280_REGISTER_DIG_H5 + 1) << 4) | (read8(BME280_REGISTER_DIG_H5) >> 4);
  dig_H6 = (int8_t)read8(BME280_REGISTER_DIG_H6);
}

double get_Temperature() {
  int32_t var1, var2;
  int32_t adc_T = read24(BME280_REGISTER_TEMPDATA);
  adc_T >>= 4;

  var1 = ((((adc_T >> 3) - ((int32_t)dig_T1 << 1))) *
          ((int32_t)dig_T2)) >> 11;

  var2 = (((((adc_T >> 4) - ((int32_t)dig_T1)) *
            ((adc_T >> 4) - ((int32_t)dig_T1))) >> 12) *
          ((int32_t)dig_T3)) >> 14;

  t_fine = var1 + var2;

  double T = (t_fine * 5 + 128) >> 8;
  return T / 100;
}

double get_Pressure() {
  int64_t var1, var2, p;
  // Must be done first to get the t_fine variable set up
  get_Temperature();

  int32_t adc_P = read24(BME280_REGISTER_PRESSUREDATA);
  adc_P >>= 4;

  var1 = ((int64_t)t_fine) - 128000;
  var2 = var1 * var1 * (int64_t)dig_P6;
  var2 = var2 + ((var1 * (int64_t)dig_P5) << 17);
  var2 = var2 + (((int64_t)dig_P4) << 35);
  var1 = ((var1 * var1 * (int64_t)dig_P3) >> 8) +
         ((var1 * (int64_t)dig_P2) << 12);
  var1 = (((((int64_t)1) << 47) + var1)) * ((int64_t)dig_P1) >> 33;

  if (var1 == 0) {
    return 0; // avoid exception caused by division by zero
  }
  p = 1048576 - adc_P;
  p = (((p << 31) - var2) * 3125) / var1;
  var1 = (((int64_t)dig_P9) * (p >> 13) * (p >> 13)) >> 25;
  var2 = (((int64_t)dig_P8) * p) >> 19;

  p = ((p + var1 + var2) >> 8) + (((int64_t)dig_P7) << 4);
  return (double)p / 256;
}

double get_Humidity(void) {
  get_Temperature(); // must be done first to get t_fine

  int32_t adc_H = read16(BME280_REGISTER_HUMIDDATA);
  if (adc_H == 0x8000) // value in case humidity measurement was disabled
    return NAN;

  int32_t v_x1_u32r;

  v_x1_u32r = (t_fine - ((int32_t)76800));

  v_x1_u32r = (((((adc_H << 14) - (((int32_t)dig_H4) << 20) -
                  (((int32_t)dig_H5) * v_x1_u32r)) +
                 ((int32_t)16384)) >>
                15) * (((((((v_x1_u32r * ((int32_t)dig_H6)) >> 10) *
                    (((v_x1_u32r * ((int32_t)dig_H3)) >> 11) + ((int32_t)32768))) >>
                   10) + ((int32_t)2097152)) * ((int32_t)dig_H2) + 8192) >> 14));

  v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) * ((int32_t)dig_H1)) >> 4));
  v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
  v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
  double h = (v_x1_u32r >> 12);
  return h / 1024.0;
}


void reset_BME280()
{
  write8(BME280_REGISTER_SOFTRESET , (uint8_t)0xB6);
}

Have fun with it. Let us know when there are improvements.
Cheers,

Jan

Powersoft

Thank you for this. I was looking for this!

Cheers,
Jan

Powersoft

Today I rewrote the routines for the BMP280 and BME280 for a single device.
Simple include the source into the main program, and call it.
This is now working as I wont. It takes a afternoon of work!
Now put the finishing touches on the BMP280/BME280.

Would it make sense to post them on the forum when they are ready?

Cheers
Jan

Powersoft

I will stop to interface I2C devices to the M5Paper.
Tried to make a connection with various devices, no positive results so far. It is a pity that they have taken this path. Now a number of devices are no longer usable for me on the M5Paper.

Powersoft

@felmue
Is there a principal difference in the I2C approach between the M5Paper and the CORE2?