Step Up/Down Dimming 3.005/3.007, 4 bit

[mrWheel]

Hi Nico,

Is there a way to send a 4bit telegram? For StepUp/Down dimming needs this but I can't see how..

... or am I missing something (again!)??

Pressing the KNX switch to dimUp/Down the lamp the monitor shows:

LPDU: BC 11 84 10 0E E1 00 89 A0 :L_Data low from 1.1.132 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 09 
LPDU: BC 11 85 10 0E E1 00 88 A0 :L_Data low from 1.1.133 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 08  

Writing 07, 08 or 09 values using writeBit() I get this:

LPDU: BC 11 C8 10 0E E1 00 81 E4 :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 01 
LPDU: BC 11 C8 10 0E E1 00 81 E4 :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 01 

Using write1ByteInt() the monitor shows:

LPDU: BC 11 C8 10 0E E2 00 80 09 EF :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write 09 
LPDU: BC 11 C8 10 0E E2 00 80 08 EE :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write 08 

[mrWheel]

I added this function:

void ESPKNXIP::send4Bit(address_t const &receiver, knx_command_type_t ct, uint8_t nible)
{
  uint8_t buf[] = {(uint8_t)(nible & 0x0F)};
  send(receiver, ct, 1, buf);
}

and now I can send telegrams with the right payload. The KNXD monitor shows:

LPDU: BC 11 C8 10 0E E1 00 87 E2 :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 07 
LPDU: BC 11 C8 10 0E E1 00 88 ED :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 08 
LPDU: BC 11 C8 10 0E E1 00 89 EC :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 09 
LPDU: BC 11 C8 10 0E E1 00 88 ED :L_Data low from 1.1.200 to 2/0/14 hops: 06 T_DATA_XXX_REQ A_GroupValue_Write (small) 08

Which is what it should be.

If you approve, will you please add this function to this already great library?

[envy]

Hi,

I probably forgot to add this, I will when I get home in a few hours.

Can you send me a link to the documentation you are using? I have the official spec at home but I doesn't look like what you showed.

Cheers, Nico

[mrWheel]

http://knx.com.ua/attachments/article/132/KNX-basic_course_full.pdf

Willem

www: http://willem.aandewiel.nl

[envy]

Done. I also added a version for 2 bits, as the spec also specifies this.

[mrWheel]

Hi Nico,

This is great! And lighting fast!

Regards,

Willem