From: Elvis D. <elv...@ma...> - 2008-12-12 06:46:41
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Hi, Does the overo motherboard have an on-board A/D converter? The product description page mentions A/D (6). Best regards, Elvis Dowson |
From: Steve S. <sa...@gm...> - 2008-12-12 23:44:44
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On Thu, Dec 11, 2008 at 10:46 PM, Elvis Dowson <elv...@ma...> wrote: > Hi, > Does the overo motherboard have an on-board A/D converter? > > The product description page mentions A/D (6). Yes, those A/D inputs come from the TPS65950 on the motherboard. See below for more details: http://focus.ti.com/docs/prod/folders/print/tps65950.html#technicaldocuments Steve > Best regards, > > Elvis Dowson > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Elvis D. <elv...@ma...> - 2008-12-13 04:57:21
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Thanks for the info, Steve! On Dec 13, 2008, at 3:44 AM, Steve Sakoman wrote: > On Thu, Dec 11, 2008 at 10:46 PM, Elvis Dowson > <elv...@ma...> wrote: >> Hi, >> Does the overo motherboard have an on-board A/D converter? >> >> The product description page mentions A/D (6). > > Yes, those A/D inputs come from the TPS65950 on the motherboard. > > See below for more details: > > http://focus.ti.com/docs/prod/folders/print/tps65950.html#technicaldocuments > > Steve > |
From: Elvis D. <elv...@ma...> - 2008-12-14 07:56:55
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Hi Steve, I have a Sharp LQ043T1DG01 4.3" 24-bit color touchscreen module that I want to interface with the Overo motherboard. The Sharp LCD display has a 4-wire analog resistive touchscreen panel. Can you confirm if the TPS65950 A/D pins are accessible from a. the overo motherboard itself via one of the three connectors or b. from the summit expansion board I couldn't find any detailed schematics on the overo motherboard or the summit expansion board, the hardware schematics section on the gumstix website has not yet been updated for the Overo. Best regards, Elvis Dowson On Dec 13, 2008, at 3:44 AM, Steve Sakoman wrote: > On Thu, Dec 11, 2008 at 10:46 PM, Elvis Dowson > <elv...@ma...> wrote: >> Hi, >> Does the overo motherboard have an on-board A/D converter? >> >> The product description page mentions A/D (6). > > Yes, those A/D inputs come from the TPS65950 on the motherboard. > > See below for more details: > > http://focus.ti.com/docs/prod/folders/print/tps65950.html#technicaldocuments > > Steve > |
From: Steve S. <sa...@gm...> - 2008-12-14 19:03:43
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On Sat, Dec 13, 2008 at 11:56 PM, Elvis Dowson <elv...@ma...> wrote: > Hi Steve, > I have a Sharp LQ043T1DG01 4.3" 24-bit color > touchscreen module that I want to interface with the Overo motherboard. > The Sharp LCD display has a 4-wire analog resistive touchscreen panel. > Can you confirm if the TPS65950 A/D pins are accessible from > a. the overo motherboard itself via one of the three connectors or http://www.gumstix.net/Documentation/view/Motherboard-I/O/Overo-Connector-J1-features-the-LCD-PWM-and-analog-signals/109.html > b. from the summit expansion board http://www.gumstix.net/Documentation/view/I/O/Gumstix-Summit-board-40-pin-header/109.html Steve > I couldn't find any detailed schematics on the overo motherboard or the > summit expansion board, the hardware schematics section on the gumstix > website has not yet been updated for the Overo. > Best regards, > Elvis Dowson > > On Dec 13, 2008, at 3:44 AM, Steve Sakoman wrote: > > On Thu, Dec 11, 2008 at 10:46 PM, Elvis Dowson <elv...@ma...> wrote: > > Hi, > > Does the overo motherboard have an on-board A/D converter? > > The product description page mentions A/D (6). > > Yes, those A/D inputs come from the TPS65950 on the motherboard. > > See below for more details: > > http://focus.ti.com/docs/prod/folders/print/tps65950.html#technicaldocuments > > Steve > > > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > |
From: Elvis D. <elv...@ma...> - 2008-12-14 20:11:34
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Thanks Steve! So the A/D inputs are available on both the overo motherboard and the summit expansion board. This is good. Just curious, though, as to why the ADC inputs are numbered from ADCIN2 to ADCIN7 instead of ADCIN1 to ADCIN6? I just have a basic question, if I have a 4-wire touch resistive input from my LCD touch screen panel, do I wire them directly from ADCIN2 to ADCIN5 (4 inputs) or should I just use ADCIN2 & ADCIN3 (2 inputs with common ground or something like that) ? Best regards, Elvis Dowson On Dec 14, 2008, at 11:03 PM, Steve Sakoman wrote: > On Sat, Dec 13, 2008 at 11:56 PM, Elvis Dowson > <elv...@ma...> wrote: >> Hi Steve, >> I have a Sharp LQ043T1DG01 4.3" 24-bit color >> touchscreen module that I want to interface with the Overo >> motherboard. >> The Sharp LCD display has a 4-wire analog resistive touchscreen >> panel. >> Can you confirm if the TPS65950 A/D pins are accessible from >> a. the overo motherboard itself via one of the three connectors or > > http://www.gumstix.net/Documentation/view/Motherboard-I/O/Overo-Connector-J1-features-the-LCD-PWM-and-analog-signals/109.html > >> b. from the summit expansion board > > http://www.gumstix.net/Documentation/view/I/O/Gumstix-Summit-board-40-pin-header/109.html > > > Steve |
From: Steve S. <sa...@gm...> - 2008-12-14 20:58:16
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On Sun, Dec 14, 2008 at 12:11 PM, Elvis Dowson <elv...@ma...> wrote: > Thanks Steve! > So the A/D inputs are available on both > the overo motherboard and the summit expansion board. This is good. > > Just curious, though, as to why the ADC inputs are numbered from > ADCIN2 to ADCIN7 instead of ADCIN1 to ADCIN6? It reflects the pin names on the TPS65950. If you read the documentation on the TPS65950 this will become clear. > I just have a basic question, if I have a 4-wire touch resistive input > from my LCD touch screen panel, do I wire them directly from ADCIN2 to > ADCIN5 (4 inputs) or should I just use ADCIN2 & ADCIN3 (2 inputs with > common ground or something like that) ? Unless you really know what you are doing I wouldn't recommend using these A/D converters. You would be much better off using an off the shelf touch screen controller IC or waiting for the Gumstix LCD buddy board. Steve > Best regards, > > Elvis Dowson > > > On Dec 14, 2008, at 11:03 PM, Steve Sakoman wrote: > >> On Sat, Dec 13, 2008 at 11:56 PM, Elvis Dowson >> <elv...@ma...> wrote: >>> Hi Steve, >>> I have a Sharp LQ043T1DG01 4.3" 24-bit color >>> touchscreen module that I want to interface with the Overo >>> motherboard. >>> The Sharp LCD display has a 4-wire analog resistive touchscreen >>> panel. >>> Can you confirm if the TPS65950 A/D pins are accessible from >>> a. the overo motherboard itself via one of the three connectors or >> >> http://www.gumstix.net/Documentation/view/Motherboard-I/O/Overo-Connector-J1-features-the-LCD-PWM-and-analog-signals/109.html >> >>> b. from the summit expansion board >> >> http://www.gumstix.net/Documentation/view/I/O/Gumstix-Summit-board-40-pin-header/109.html >> >> >> Steve > > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Elvis D. <elv...@ma...> - 2008-12-14 22:37:28
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Hi Steve, I just want to reduce part count on my design. One option is to use the TI TSC2007 touch screen controller with an I2C interface. The easier option is to use the A/D converters on the TPS65950. I recall reading somewhere about an equation that needs to be evaluated to compute the x-y co-ordinates of the touch screen input, give the resistance measured from the touch screen panel. The only thing I'm not so sure about is where the ground is, for reading the analog resistive values from the touch screen panel, for the 4-wire inputs. So, I'm hoping to wire the touch screen into the A/D converters and at regular intervals, monitor the resistance and compute the location of the touchscreen input. Hmmm, now I realize that this might be an inefficient way to process the touch screen inputs, since it would steal CPU cycles. Perhaps, using an I2C controller might be a better way, and it might be interrupt driven, so the CPU need only respond when a touch screen input has been detected and the data sent to the CPU. In any case, I'd like to still explore the possibility of using the on- board A/D converters to do the job, for the time being, and I'll probably explore integrating the I2C chip for the next iteration. Best regards, Elvis Dowson > > >> I just have a basic question, if I have a 4-wire touch resistive >> input >> from my LCD touch screen panel, do I wire them directly from ADCIN2 >> to >> ADCIN5 (4 inputs) or should I just use ADCIN2 & ADCIN3 (2 inputs with >> common ground or something like that) ? > > Unless you really know what you are doing I wouldn't recommend using > these A/D converters. You would be much better off using an off the > shelf touch screen controller IC or waiting for the Gumstix LCD buddy > board. > > Steve |