Hello,
few times ago, i build a midimon http://ucapps.de/midimon.html with it’s MTC display (very nice)
Now, i’m interested in driving the Display module, with C code.
But, I dont know how to start (i still dont understand very well the mutliplexing stuff), so i ask you, as usual 
I think it could kick ass to see, pattern position, tempo, CC,'s, Hex values etc, on those nice glowing numbers 
Hi all !
Just to let you know that the commander.de stite is un reachable but … I’ve been hunting and YES !!! the sdcc installer (thanks god ! that’s really cool) is available here for all OSX super Star Users !!! :
http://www.1710.co.uk/picosx/Resources/
Thanks you very for all those installers !!!
Jules - Toulouse, France.
Hem, i reply to myslelf, not bcause i’m stupid but because i have some clues, and i dont want you waste your time :
I found many interesting informations in the leddigits.inc file, from the midimonV2 application
I think the most important was :
;; --------------------------------------------------------------------------
;; FUNCTION: LEDDIGITS_Update
;; DESCRIPTION: This function should be called periodically by
;; USER_SR_Service_Prepare before the DOUT registers will be updated
;; from MIOS
;; .....
;; --------------------------------------------------------------------------
LEDDIGITS_Update
;; increment LED digit counter, wrap at 4
;; (0, 1, 2, 3, 0, 1, 2, ...)
SET_BSR LEDDIGITS_CTR ; (use bank mechanism so that the registers can be located at addresses >= 0x80)
incf LEDDIGITS_CTR, W, BANKED
andlw 0x03
movwf LEDDIGITS_CTR, BANKED
;; get shift register pattern for the select line:
;; LED digit 0 and 4 -> b'10001000'
;; LED digit 1 and 5 -> b'01000100'
;; LED digit 2 and 6 -> b'00100010'
;; LED digit 3 and 7 -> b'00010001'
I’m on the way to do it working the same way, but without asm.
Hi Bill,
as I understood, the main trick is to wire the LEDs correctly (I think a sample can be found with the LED-Rings wiring PDF). Then you need kind of a matrix array for each figure you want to display… this matrix is then switched line-by-line…
sorry if I’m so unconcrete… I’m very short in time these days, I’ll watch this thread, maybe I can contribute more details when I get my LED-meters working
Cheers,
Michael
@jdelgoulet: thanks for your kind words
although this is a bit off-topic, just for the record, my site has never been down: http://www.audiocommander.de/blog/?p=48 and Ben (http://www.1710.co.uk/picosx/) had only temporary troubles 'cause the server got struck by a lightning :o
Hello,
the main trick is to wire the LEDs correctly
I have this part done (i allready have my midimon+led display working perfectly)
I tried this simple code, with no success, anyone can help me ?
(i thought) this code should send the pattern 0x7f to every led-chars, but they are all off 
any idea ?
unsigned char led_c=0;//led counter
const char led_b[8] = { 0,0,0,0,0,0,0,0,};//led buffer
const char led_sr[4] = { 0x88,0x44,0x22,0x11,};//shift register patterns
/*
;; LED digit 0 and 4 -> b'10001000' 0x88
;; LED digit 1 and 5 -> b'01000100' 0x44
;; LED digit 2 and 6 -> b'00100010' 0x22
;; LED digit 3 and 7 -> b'00010001' 0x11
*/
void SR_Service_Prepare(void) __wparam
{
//LEDDIGITS_Update
MIOS_DOUT_SRSet(1,led_sr[led_c]);//char selection (0123)
MIOS_DOUT_SRSet(0,0x7f);//first 4 digits (test pattern)
MIOS_DOUT_SRSet(2,0x7f);//next 4 digits (test pattern)
led_c++;
if(led_c>3)led_c=0;
}
