12f675 and midi!

[Ingvar]

GPIO.3 is INPUT ONLY. Use a different pin and please read the datasheet. You probably need to disable AD and comparator aswell.

[Alaskanphoenix]

I used gpio.2 as output to send midi messages and i must use the gpio.0 and gpio.1 as ad inputs with pots!

I'm a beginner in pic programming,so please explain me how to configure these pins!

Thanks a lot

[mischl]

uuups. sorry, you are right, there is no uart at the 12f675 ;-)

look at the manual under SEROUT2 for calculating baud rate. 31250 baud needs a 20 mhz crystal.

for analog in : some sample program with a 12F675 look at TESTX4.BAS

[Alaskanphoenix]

I tried to use an external 20 mhz xtal with the serout2 but nothing!
Then i used the debug command with the internal xtal and finally some message appears but wrong,probably it can't reach 31250 baud! how can i disable the internal and use the external xtal?

[mischl]

please post your code si we can take a look

you can define the osc as usual, don't write any : @ DEVICE pic12F675, INTRC_OSC ' activates internal osc

how looks your serout2 command?

[Ingvar]

You set the use of an exernal oscillator in your programmer software, in your case you should look for HS oscillator. To make GP0 and 1 analog inputs, GP2 digital output and ADconverter 10bit, you should probably(never used the 12F675) use ....

TRISIO = %00000011
ANSEL = %00110011
ADCON0 = %10000001

ADvalue VAR WORD

ADCIN 0,ADvalue ' Read channel 0
ADCIN 1,ADvalue ' Read channel 1

[Alaskanphoenix]

I want to use gp0 and gp1 as analog inputs and gp3 as digital out to send midi messages:

DEFINE OSC 20
DEFINE DEBUG_BAUD 31250 ' midi baud rate
DEFINE DEBUG_REG gpio ' Set Debug pin port
DEFINE DEBUG_BIT 2 ' Set Debug pin bit
DEFINE DEBUG_MODE 0

adval var byte ' Create adval to store result
ANSEL = %00000011 ' ----DDAA
CMCON = 7 ' Analog comparators off

loop: ADCIN 0, adval ' Read channel 0 to adval
debug $b0,$00,adval
Pause 250 ' Do it all about 10 times a second
Goto loop ' Do it forever

End

how can i limit the results of analog inputs between 0-127?

Thanks a lot

[mischl]

divide adval by 2

adval = adval / 2
adval = adval >> 2