I need modbus double value conversion function

[Ali BAŞEL]

Hello,

I started to use siemens sentron pac3200 energy analyser with this library.

For the address 801 a double value returns like below:

<29><E8><00><00><00><0B><FF><03><08><41><E5><61><A9><ED><DE><6E><39>

And this the value part 8 bytes - 4 words: <41><E5><61><A9><ED><DE><6E><39>

I need a similar conversion function like for the float values but for double values

float modbus_get_float_dcba(const uint16_t *src)

double modbus_get_double_dcba(const uint16_t *src)

Can anyone convert this function to double?

/* Get a float from 4 bytes (Modbus) in inversed format (DCBA) */
float modbus_get_float_dcba(const uint16_t *src)
{
    float f;
    uint32_t i;

    i = ntohl(bswap_32((((uint32_t)src[0]) << 16) + src[1]));
    memcpy(&f, &i, sizeof(float));

    return f;
}

Regards,

Ali

[Stéphane Raimbault]

No answers so you need to write it!

I'll do my best to merge it.

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[Patrick Boettcher]

On Mon, 26 Mar 2018 23:00:23 +0200
Stéphane Raimbault <stephane....@gmail.com> wrote:

> No answers so you need to write it!
> I'll do my best to merge it.

This same issue has been discussed here:

https://github.com/stephane/libmodbus/issues/423

best regards,
--
Patrick.