Am 2014-08-05 15:37, schrieb Michael Wenz:
Hello,I am using Etherlab 1.5.2, Linux kernel 3.2.21, Xenomai-2.6.2.1 and I would like to download negative floating point values with the EtherLab command line tool to a slave: e.g. ./ethercat download -p0 0x2001 0x9 -10.3 It is no problem to download positive values, but negative values cannot be downloaded with the above call. The SDO entry has type 32 bit float.
Try downloading a hex value: -10.3 = 0xc124cccd See attached proggie (assumes little endian computer): # num2hex -10.3 -10.300000 = 0xC124CCCD
Do you have any advice, please?
Kind regards
Michael
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num2hex
Description: Binary data
/*****************************************************************************
* Convert as many singles to IEEE754 hexadecimal representation
* NOTE: assumes Little Endianness
*
* (c) 2014 Richard Hacker
* License: LGPL
*
* You may use this program as is. No guarantee for correctness!
*
*****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
/*****************************************************************************/
int main(int argc, char **argv)
{
union {
float f;
unsigned char c[4];
} value;
int i,j;
if (argc == 1) {
printf("Useage: %s <float>\n"
"where: <float> are as many floats as you like\n",
argv[0]);
}
while (--argc) {
value.f = atof(*++argv);
printf("%f = 0x", value.f);
for (j = 3; j >= 0; j--)
printf("%X", value.c[j]);
printf("\n");
}
}
/*****************************************************************************/
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