Here’s a few GPIO you can use immediately from userspace without any u-boot or kernel changes. It is part of the AeroCore 2 Product Suite. AeroCore 2 for Overo. I patched my kernel to disable ADS and enable spidev and i see spidev1. Value at address 0xC8 0xc8:
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A bug or something You can also change the mux configuration from within Linux. Post by nw Post by will2km Post by Markus Svilans Post by will2km Post by Markus Svilans was using a scope to check that the Gumstix was generating the chip select and clock signals properly. Configured as output only when exported by the kernel in board-overo.
Pin 4 – gpio It’s the pendown signal on the touchscreen controller but it’s available if you aren’t using a expansion board with touchscreen support. These depend on the board configuration and the kernel drivers being used. Hence, a scalar value will apply to all channels specified in the Digital output channels field. Can anyone help determine why some SPI reads are failing? According to gumshix PXA datasheetmost of the pins are limited to 3mA, and a few can go upto 4 mA see page Markus Svilans To reconfigure pins from within a kernel module the following code can be used: To make it visible in sysfs:.
Mon, 25 Oct The alternative functions are described in the PXA Developer’s Manual link should be found in the Featured links-box section 4.
Category:SPI – Gumstix User Wiki
Add sensors or remove unused components with the ease of a drag-and-drop interface. See the remuxing example below. Post by nw kernel-version like Will: Spidev is a standard Linux module that implements a generic SPI protocol driver while exposing a char device interface to userland. Doug On Thu, May 27, at 2: There are additional pins on the header that can be reconfigured this way. Ocero configured as GPIO are sometimes also specified as being strictly input or output.
I wouldn’t mind knowing how it turned out for you. To make it visible in sysfs: Make sure the spidev.
Depending on the OpenEmbedded OE Linux system clock resolution configured and running on the Overo board, the maximum sampling frequency achievable by a over will typically vary between 50 Hz usually the default OE system configuration and 1kHz i. This was only partially successful.
AeroCore 2 for Overo. Related posts Find more information about this product by reading one or all of the following: You will have to disable one or both of these drivers in your kernel config if you want to use those respective CS lines.
A low-noise synchronous step-down DC-DC converter. Now you can export and configure gpio from userspace like the example with gpio at the beginning.
One problem though, I wasn’t able to configure the modules by using “bitbake -c menuconfig linux-omap A high resolution altitude and digital atmospheric pressure sensor accurate to within 10 cm.