From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yang, Xiaopeng" Subject: Re: ads7846: data read from tsc2046 are all zeros Date: Fri, 09 Nov 2007 16:33:25 +0800 Message-ID: <47341B55.7030305@windriver.com> References: <4732E60E.3000308@windriver.com> <4733D81D.4020907@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4733D81D.4020907@windriver.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces+gplao-linux-omap-open-source=gmane.org@linux.omap.com Errors-To: linux-omap-open-source-bounces+gplao-linux-omap-open-source=gmane.org@linux.omap.com To: "Yang, Xiaopeng" Cc: linux-omap-open-source@linux.omap.com List-Id: linux-omap@vger.kernel.org Resolved, the tsc2046 wouldn't be power on if the LCD module is not enabled. Xiaopeng Yang, Xiaopeng wrote: > Hi all, > > I captured the signals of the host-side pins of tsc2046, the SPI pins > and PENIRQ work correctly except DOUT remains LOW during CS is active. > That's why all read values are zore. > > It seems like the tsc2046 doesn't work at all. I measured the voltage of > the power supply of tsc2046, the Vcc is only 0.93V. This shouldn't > happen in the normal operation. Maybe there is a switch to turn the > power on for tsc2046? > > Thanks, > Xiaopeng > > Juha Kuikka wrote: >> On 11/8/07, *Yang, Xiaopeng* > > wrote: >> >> Hi all, >> >> I'm working on the tsc2046 touchscreen controller (using ads7846 >> driver) on >> sdp2430 v5.0.1 board. I can't get the touchscreen work with the >> linux-omap >> git tree. The driver builds, boots and register itself with no >> problem, >> interrupts can also be triggered when touching the panel, but no >> input >> events can be read. By enabling debug output, I finally found that >> all the >> values read from tsc2046 are all zeros. >> >> Does anyone encounter the same problem? What could be the root cause >> for >> this problem? Any suggestions are welcome. >> >> >> I'd check the pin muxes on the input (SPI I'm guessing) device you are >> using to connecto to tsc2046). >> If still nothing I'd hook up logic analyzer to the SPI lines and see >> what's happening. >> >> - Juha >> >> -- >> Madness takes it's toll. Please have exact change. > _______________________________________________ > Linux-omap-open-source mailing list > Linux-omap-open-source@linux.omap.com > http://linux.omap.com/mailman/listinfo/linux-omap-open-source >