Thank you for such explanation. But I havnt attached anything on LCD_DATA.
I have four connection. 1)GND(pin1) 2)Vcc(pin 3) 3)SCL(pin 17)-I have pulled up internally 4)SDA(pin 18)-I have pulled up internally and my BBB is not powering on!!!! As per your suggession how I use pull up resister for scl and sda pin, which I have pulled up internally (from device tree). Regards Jay Kothari On Thursday, 15 January 2015 11:55:51 UTC+5:30, john3909 wrote: > > > From: JAY KOTHARI <[email protected] <javascript:>> > Reply-To: "[email protected] <javascript:>" < > [email protected] <javascript:>> > Date: Wednesday, January 14, 2015 at 9:56 PM > To: "[email protected] <javascript:>" <[email protected] > <javascript:>> > Subject: Re: [beagleboard] bmp085 with uext connection with BBB > > I belive that they may not provide required current. But would it cause by > BBB not to power on? > > The pull up resistors will have nothing to do with BBB power up. My bet is > you have something connected to LCD_DATA[15..0] which changes the startup > mode of the BBB. Anything connected to these pins must be isolated until > after the SYS_RESETn goes high. Use a high impedance buffer to isolate > these signals and gate then with SYS_RESETn. > > Regards, > John > > > I will connect external resistor with sda1 and scl1 pins of BBB which are > already pulled up. Where should I connect the other leg of these resistor. > > Regard > Jay Kothari > > On Thursday, 15 January 2015 11:21:22 UTC+5:30, john3909 wrote: >> >> >> From: JAY KOTHARI <[email protected]> >> Reply-To: "[email protected]" <[email protected]> >> Date: Wednesday, January 14, 2015 at 9:17 PM >> To: "[email protected]" <[email protected]> >> Subject: Re: [beagleboard] bmp085 with uext connection with BBB >> >> bmp085 sensor works on 3.3v volt. I have internally pulled up the pin and >> I can see resistor connected in the harware diagram of bmp085. >> Still I connect external resistor? >> >> The internal resistors don’t provide enough current. You will still need >> external resistors and I suggest 4k7. >> >> Regards, >> John >> >> >> >> On Thursday, 15 January 2015 09:56:46 UTC+5:30, liyaoshi wrote: >>> >>> Can you try connect with external 5V supply ? >>> BTW, suggest R2 and R3 connect with 10k resister , >>> >>> >>> 2015-01-15 12:14 GMT+08:00 JAY KOTHARI <[email protected]>: >>> >>>> Hello, >>>> I am using bmp085 sensor with uext connection with beaglebone >>>> black. I have made change in device tree of BBB. I have made i2c1(pin 17 >>>> and 18) as input pin and pulled up internally and set it to mode two. I >>>> have also set compatible property in device tree to load module of bmp085. >>>> After looking into hardware design manual of bmp085 I interface >>>> with beaglebone black.I connected four wire >>>> (vdd(pin3),gnd(pin1),sda(pin17) >>>> and scl(pin18)) and kept other unconnected. >>>> >>>> >>>> https://www.olimex.com/Products/Modules/Sensors/MOD-BMP085/resources/MOD-BMP085_sch.pdf >>>> >>>> When I boot my kernel my bmp085 module is loaded automatically and I >>>> am getting entry in /dev of i2c1 >>>> >>>> Problem: >>>> When I connect BBB with bmp085 my kernel hangs or BBB does not >>>> start at all!!!!What may be the problem???? >>>> Note: >>>> I am not using 5v supply. >>>> >>>> >>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "BeagleBoard" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> >> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
