using memcpy in formula nodes

[Sangkyu]

Hi,

I want to use memcpy in formula nodes.

But there is error in my program.

Labview is not support memcpy?

or I mistake somethings?

[RavensFan]

Why do you want to use memcpy?

No, it is not a valid command for a formula node.

What are you really trying to do?

[Sangkyu]

I want to send float data to PC using UART.

My MCU(STM32) source is below.

uint32_t ftoc_buffer2=0;

float32_t IIR_HPF_output_display;

uint8_t tx_buff[6];

memcpy(&ftoc_buffer2,&IIR_HPF_output_display,4); // for uart send

tx_buff[2]=ftoc_buffer2>>24;
tx_buff[3]=ftoc_buffer2>>16;
tx_buff[4]=ftoc_buffer2>>8;
tx_buff[5]=0xFF&ftoc_buffer2;

[send txbuff[] by uart]

I convert float data to 8bit hex data. And send to PC by UART.

And, Labview program receive 4*8bit hex data

And convert to 32bit hex data

After that, I stuck how convert to float value.

In C language, I use memcpy.

How can i convert in labview?

[altenbach · Accepted solution]

Typecast the 4 byte string to a SGL. (virtually no code needed. Reverse the string if you need little endian byte order or use unflatten from string instead)

See attached.

(In your original code, make sure the outputs are SGL, not DBL)

[Sangkyu]

Thank you for your help.

Work very well my program.