ehayon / beaglebone-gpio Goto Github PK

Hello ehayon

I got the following situation ,,,

I have to change a pin on my BeagleBone (INPUT or OUTPUT) many times in my c program.
At boot the pin is input. and has high impedance.
During my program I change the pin as output ( pinMode(P8_44,OUTPUT,7,PULLUP) ; ) and I write to it HIGH or LOW ( digitalWrite(P8_44,HIGH) ; or digitalWrite(P8_44,LOW) ; ) .
When I make again the pin input ( pinMode(P8_44,INPUT,7,PULLUP) ; ), the pin does not have high impedance.

Looking at the sysfs I got that the pin is INPUT.

thank you in advanced for your help

Changed these lines in gpio.c
map[(ADCSTEPCONFIG1-MMAP_OFFSET)/4] = 0x00<<19 | ADC_AVG16<<2 | 0x01;

the averaging is set by bit 2-4 (TRM 12.5.20) not 0-2 and I changed the mode to 01 = SW enabled, continuous. With one-shot the call to analogRead() returns the value from the previous call to analogRead(), in continous mode you get the current value. There may be a better way to do this.

Also there needs to be at least one call to adc_init() in the setup otherwise the above does not get set. I assumed that this line would do it, but it was not calling adc_init(), because I guess the clock was already enabled.

if(map[(CM_WKUP_ADC_TSC_CLKCTRL-MMAP_OFFSET)/4] & CM_WKUP_IDLEST_DISABLED)
adc_init();

Hi, I get this error when use pins with high id bank.

For example:
digitalRead(P8_44);

Any idea?

Thanks!