Error in mbhp_blm_map.pdf?

MIDIbox BLM
1

TK, can you please check the schematic in mbhp_blm_map.pdf? In the extra row, buttons 9-16 have the LEDs mirrored in their groups of 4 with respect to the switches. To explain another way, on my PCB, if I push button 9, LED 12 will light, and vice versa.

Also, could you please offer some guidance as to how I should modify the scalar app(MIOS32) to remap these?

This PCB is 5x17 version of the full BLM16x16, just to use for buttons for a mixer section ie. mute, solo, arm etc. So I won’t need the ‘packed format’ pattern matching, just toggling of specific LEDs on MIDI in and button push.

I suspect I need to do my remapping in this function:

if( note <= 0x0f ) {

  	// BLM16x16 LEDs

  	led_mod_ix = chn >> 2;

  	led_row_ix = ((chn&3) << 1) + ((note >> 3) & 1);

  	led_column_ix = note & 0x7;

  	modify_led = 1;

	} else if( note == 0x40 ) {

  	// extra column LEDs

  	led_mod_ix = 4;

  	led_row_ix = (chn&3) << 1;

  	led_column_ix = chn >> 2;

  	modify_led = 1;

	} else if( chn == 0 && note >= 0x60 && note <= 0x6f ) {

  	// extra row LEDs

  	led_mod_ix = 4;

  	led_row_ix = 1 + ((note >> 1) & 6);

  	led_column_ix = note & 3;

  	modify_led = 1;

	} else if( chn == 0xf && note >= 0x60 && note <= 0x6f ) {

  	// additional extra LEDs

  	led_mod_ix = 4;

  	led_row_ix = 1 + ((note >> 1) & 6);

  	led_column_ix = 4 + (note & 3);

  	modify_led = 1;

	}

and also maybe in DIN_BLM_NotifyToggle depending on what MIDI feedback I can get Reaper to give me.

Thanks :slight_smile:

2

This is very strange, because the LEDs and buttons should be connected to the same common lines (blue lines in the mbhp_blm_map.pdf file), accordingly there is no reason why the LEDs should be mirrored.

Could I have a look into your PCB layout?

Modification:

// extra row LEDs
led_mod_ix = 4;
led_row_ix = 1 + ((note >> 1) & 6);
led_column_ix = note & 3;
if( note >= 0x68 )
led_column_ix ^= 3; // mirrror LEDs 9..12 and 13..16
modify_led = 1;
[/code]









Best Regards, Thorsten.
3

TK,

As far as I can tell from the schematic it’s not the cathodes that are swapped but the LED anodes. (I think that is the correct terminology)

Comparing extra row buttons 1-4 and 5-8 with 9-12 and 13-16, for eg.

Switch 1, 5, 9, 13 -> I0

Red 1, 5 -> R0

Green 1, 5 -> G0

BUT:

Red 9, 13 -> R3

Green 9, 13 -> G3

I’ve attached an image of my PCB which I think is consistent with the schematic. I’ll have the full design files up on my wiki page once I’ve got this sorted.

Also, I realised that for this PCB I’ll need to mod the following section, as I don’t have the full chain of BLM_SCALAR preceding the +X section. I’ll have to have a think about it.

// BLM16x16 LEDs

  	led_mod_ix = chn >> 2;

  	led_row_ix = ((chn&3) << 1) + ((note >> 3) & 1);

  	led_column_ix = note & 0x7;

  	modify_led = 1;

Thanks heaps :slight_smile: :flowers:

post-6793-0-55601600-1312065797.png
post-6793-0-55601600-1312065797.png2611×612 502 KB

4

Ah - now I got it, and corrected the schematic!

I’m sorry that this mistake caused trouble at your side! :-/

Best Regards, Thorsten.

5

No worries - thanks for all your hard work :slight_smile: