Hello everybody,

I would like to know how I can use an internal memory status through 2 different level of the EXEC block.
I tried with GOTO and FROM, but it doens't seems to work.

Thank you for you help.

@jan-reitinger Hello Jan, thank you for your answers.

As I have done some test yesterday, I come with another question.
As you can see on my printscreen, I have 3 Rexlang in one task, these task is doing reading on probes.
1 Rexlang per probes, as I only want to read values on the probe every 30 sec, I change the tick and ntick inside the EXEC.
My problem is that I would like to have also manual action in this task. ( turn on/off, output ) as I have change the scan time of this task, the manual action as a long delay before the change.

Therefore I tried to put back the original values of the scan time in the EXEC. ( 0.05 / 10 lvl0 ) As soon as I put these values, it's like if I'm killing the rexcore in my raspeberry pi. A lot of trouble to connect, no more possible to go in live watch, etc...
My question is: is it possible that the fact that I have 3 rexlang in 1 task, with ( 0.05 *10 ) scan time, could kill the "CPU" ?
Do I have to manage the Hold of the Rexlang, to only do measurement when I need it ?

Hope my explanation is clear.
Arnaud

Hello everybody,

I would like to know how I can use an internal memory status through 2 different level of the EXEC block.
I tried with GOTO and FROM, but it doens't seems to work.

Thank you for you help.

@reitinge

Everything works fine !
Thank you.

@reitinge

Hi.

I had time to dig a littl bit, and I find solution to do the write and read in 1 rexlang.
After that no more issue with alarm and I'm able to trace " message"

It works fine.
But still I don't understand how to display the value of "message" in the HMI designer.

I tried with standard display and string display.
I would like also to trend the ASCII value ( 3.xxxx)
Can you give me a hand on this ?

Thx.

Arnaud.

my code :

/[5]*************************************
*

• REXLANG - Reading data from MCP3422 AD converter via I2C

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

string parameter(0) i2c_dev; // the I2C bus is defined by the p0 parameter

//assigning variables to outputs, these variables are WRITE-ONLY
long output(0) adc_value;
long output(1) adc_value1;
long output(2) adc_value2;
long output(3) adc_value3;
long output(4) adc_value4;
long output(5) adc_value5;
long output(6) adc_value6;
long output(7) message;
string output(8) message;

//declaration of variables
long i2c_bufTx[4]; //buffer for transmitting data
long i2c_bufRx[7]; //buffer for receiving data
long i2c_bus_handle;
long i2c_chip_address;
long i2c_write_count;
long i2c_read_count;
long i2c_ret_fun;
int i;
char message[5];

//the init procedure is executed once when the REXLANG function block initializes
int init(void)
{
i2c_bus_handle = OpenI2C(i2c_dev); // open I2C bus
Trace(1,i2c_bus_handle);

i2c_chip_address = 0x63; // 7-bit address of the I2C device

return 0;

}

//the main procedure is executed once in each sampling period
long main(void)
{
//i2c_bufTx[0] = 0x46;
//i2c_bufTx[1] = 0x69;
//i2c_bufTx[2] = 0x6E;
//i2c_bufTx[3] = 0x64;

i2c_bufTx[0] = 0x52;

// i2c_bufTx[0] = 0x53;
//i2c_bufTx[1] = 0x6C;
//i2c_bufTx[2] = 0x65;
//i2c_bufTx[3] = 0x65;
//i2c_bufTx[4] = 0x70;

i2c_write_count = 1;
i2c_read_count = 0;

//Sending data via I2C
i2c_ret_fun = I2C(i2c_bus_handle, i2c_chip_address, i2c_bufTx, i2c_write_count, i2c_bufRx, i2c_read_count);

Suspend (3);
i2c_write_count = 0;
i2c_read_count = 7;

i2c_ret_fun = I2C(i2c_bus_handle, i2c_chip_address, i2c_bufTx, i2c_write_count, i2c_bufRx, i2c_read_count);

adc_value = (i2c_bufRx[0]);
adc_value1 = (i2c_bufRx[1]);
adc_value2 = (i2c_bufRx[2]);
adc_value3 = (i2c_bufRx[3]);
adc_value4 = (i2c_bufRx[4]);
adc_value5 = (i2c_bufRx[5]);

for (i=1; i<6; i++)
message[i-1] = i2c_bufRx[i];
Trace(1,message);

return 0;
}

//the exit procedure is executed once when the task is correctly terminated
// (system shutdown, downloading new control algorithm, etc.)
long exit(void)
{
if(i2c_bus_handle>=0) Close(i2c_bus_handle); // close I2C bus
return 0;
}

@reitinge

Hello, Happy new year. Hope you are going .
I tried to use trace with you code up here, but even if the block is returning the correct value of my Ezo components,
I have an 508 error.

therefore no trace is seen in the log . any idea why 508 error ?

Anyway even if I hand write 5 values into message[5], how after do I see it on the HMI page.
If I use a declaration of output like :

long output(x) message; or string output(x) I can't manage to see values in message.
How do I proceed ?

thx

Arnaud

@reitinge

Hello, Happy new year. Thanks for your help and sorry for the time lost for my com issue. I was targeting Localhost and not my Pi. Except the fact that command need to be send in Hex and not in Dec, your code works find.

I'm able to send command and read values back.
Thanks a lot.

I still have a couple of question for you :

1. now I have the reading of my probe in bufRx [1] to [5] in DEC. and I need to convert it in ASCII. (51 46 56 57 54 = 3.896 )
   Is there a function for that, in Rexlang or another FB to use ?

2. Between a write and a read, I have for example 900ms to wait . So currently I have done 2 Rexlang, 1 to write, 1 to read.
   And I use a timer between both FB. Is there a way to do it directly in Rexlang, or do I have to continue to use 2 block ?
   I didn't find answer in the doc.

Have a good day.

Arnaud.

@reitinge

I do have a negative result with the trace function .

here is a print screen of the log and the current BF code :

What could be the error to have the trace at -106.

Arnaud

@reitinge

Hello again thx for your time.

When I try to add trace function, I have an error in the during compiling : function 'trace' is not declared ?
The example that you attach in your response, is when you request data from device. ( so we read data )

But if I want to write I have this data :

So Do I have to generate an array of 5 and send Start, I2c address, write, "the wanted function", stop ?
And easy test for me is to make a led blinking on the EZo chip :

If I understand their example, I need to WRITE find in the EZO and there is no returns values because it's making a led blinking.
The example with ascii code return, is when I do a reading of the probe for example.
My question is if I write Find, Do I have to send ( write; find ) And I alerady have the start, with open I2c and adresse, and stop or do I have to send all data ?

Hope I'm enough clear ?

Arnaud.

Hello reitinge,

Here is the requested log :

Thanks for the help.

Arnaud.

Hello,

I would like to use Python FB for a test, but as soon as I try to download to my Pi, as i an error.

error: Rexygen Module Error - some driver or block is not installed or licensed on target device. ( code-108 )
I did follow instruction of Python block.

I have done the apt install rex-pythonblkt and even the python3-numpy python3-opencv.
But in all case I have this error.

Someone can give me a hint ?
Arnaud