ATMEL AT91 ADC DRIVER

Besides reading single values through the sysfs interface, the driver provides a data streaming mode what was the main intention of this work. The program first makes use of sysfs to determine selected channels and data size then starts measurement, converts data and prints some statistics to stderr. The driver was tested on these kernels: However, you might want to change that. The default value is This feature is exposed by IIO through the following files:

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Streaming is stopped when the device is closed. Are there additional software packages available for the ipCore basic firmware?

CONFIG_AT91_ADC: Atmel AT91 ADC

However, you might want to change that. Ag91 patch adds ADC driver's source. If you need to read a higher signal use a schematic like this:.

With device tree, name of the device may change to some form like "fc These files are used to configure the driver and to make single value measurements.

The first step is to get the Linux kernel: Terms of use of this documentation Terms and conditions Acme Systems srl provided this documentation "as is" without warranty or guarantees of any kind. xdc

Terms of use of this documentation. Maximum thoughput is limited by conversion time, meaning trigger frequency is not equal to output frequency in all cases.

Release 4.11 drivers/iio/adc/at91-sama5d2_adc.c

IO method, output format and data destination can be controlled at command line. The device uses a double buffering technique and supports blocking as well as non-blocking read and poll. In either case, the conversion is started on rising edges. A description of configuring and compiling the linux kernel can be found in our linux guide. The default value is Ten bit measurements result in streams with 16 bit channel data.

IioAdcDriver < Linux4SAM < TWiki

A stream of four channels at eight bit would look like:. Please note that the setup of the timer counters in themselves is not achieved by this driver, so you will have to do it yourself.

Please note that conversions are done one channel at a time. Software Triggers Software triggers are an ADC operating mode where the software starts the conversion. To produce a kernel image suitable for U-Boot: In this way the max sample resolution we obtain is about 3.

It could be either u for unsigned or s for signed 10 is the number of relevant bits of information 16 is the actual number of bits used to store the datum 0 is the number of right shifts needed.

This is described in section "Data streaming". For the G20, you have two types of hardware triggers, either timer counters are the trigger for the conversion, either an external pin is used to provide such an input.

It converts streamed data to CSV output that can be stored on disk or network. Besides reading single values through the sysfs interface, the driver provides a data streaming mode what was the main intention of this work. Just set it to true or false whether you want the pin corresponding to the external trigger multiplexed as trigger inputs or not.

Up to four channels Selectable resolution of eight or ten bit Single measurements Data streaming Applying the patch In order to use the driver kernel sources need to be patched. Now re-compile the kernel. How the ADC stores its data. The behaviour of frequency differs a atmsl when read back. The important fields of that structure for the multiplexing are: On Sama5d3 Xplained board, I get timeout when I try to convert the channels.

The driver's sysfs files become read-only as long as armel device is open.