spitting j5 into 4 out / 4 Ain

Design Concepts
1

Hi,

I’m using a midibox cv to midify a Moog rogue but would love to convert the synth’s cv out into midi using an analog input.

Right now, I am usgin port J5 as Dout for trigger but only need the first 2 pins as outputs.

Is it easy to redefine say pins 3 to 8 of J5 as analog inputs?

Thanks in advance for your insight

Best regards

Alex

2

Yeh it’s not too rough. You set the appropriate TRISx bits to 1, and configure the ADC accordingly (unmuxed).

3

thanks stryd_one

I don’t want to sound lazy but please could you paste me an example code if you have one so i can put your explanation to code. I’ve never tried programming beyond the Mios functions

Thanks

4

Edit: don’t use this yet… I gotta check one more thing…

I went to try this and found that TK left you a hint:

j5_dout.inc:

J5_DOUT_Init
	;; disable the ADC which allocates the analog pins
	;; removed
	;; movlw	0x07
	;; movwf	ADCON1

	;; turn on the output driver of PORTA and PORTE
	;; (note: if you want to use some of them as input instead, just set the appr. line to "bsf TRISx, x"

	;; first 6 pins reassigned as AINs
	bsf	TRISA, 0	; Pin RA.0 = ain
	bsf	TRISA, 1	; Pin RA.1 = ain
	bsf	TRISA, 2	; Pin RA.2 = ain
	bsf	TRISA, 3	; Pin RA.3 = ain
	bsf	TRISA, 5	; Pin RA.5 = ain
	bsf	TRISE, 0	; Pin RE.0 = ain
	;; last two are still DOUTs
	bcf	TRISE, 1	; Pin RE.1 = output
	bcf	TRISE, 2	; Pin RE.2 = output

	return

Then in main.inc:

USER_Init

.......

	;; initialize J5 for driving LEDs if enabled
#if ENABLE_J5
	call	J5_DOUT_Init
#endif
	;; initialise AINs. BE SURE TO EDIT j5_dout.inc !!
	movlw	0x06
	call	MIOS_AIN_NumberSet
	call	MIOS_AIN_UnMuxed

........

Then throw your stuff in

USER_AIN_NotifyChange

;; your code here

	return

I *think* that will work. Check my work, because ****ing this up can result in a short and nuked PIC.

5

Okay there was one thing I wasn’t sure I’d gotten right, and it turns out that it depends on which PIC you’re using. In the code above, right at the top, is this:

J5_DOUT_Init
	;; disable the ADC which allocates the analog pins
	;; removed
	;; movlw	0x07
	;; movwf	ADCON1

If you have a 4620/4685/etc (newer chip) then make it this:

J5_DOUT_Init
	;; AN0...AN5 AINs, and AN6,7 DINs
	movlw	0x09
	movwf	ADCON1

If it’s a 452 … uhm… Pretty sure that we want

J5_DOUT_Init
	;; AN0...AN5 AINs, and AN6,7 DINs
	movlw	1 << ADFM) | (1 << ADCS2) | 0x09
	movwf	ADCON1

Oh, in case you didn’t notice, you have to use the AINs for the first 6 pins on the port, and the remainder can be DOUTs. BTW, if you want to use more or less pins, these ADCON1 values will change. You can find tables in the PIC datasheets that describe what ADCON1 values will do.

6

Thanks so much for your time. I will try this asap! This is really going to add excitement to my moog!

Thanks again

Alex

7

Just ahh…

Check my work, because ****ing this up can result in a short and nuked PIC.

:wink: