AS1531: Difference between revisions
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== Introduction == | == Introduction == | ||
AS1531 is a 8 channels 12bits analog do digital converter made by [http://www.austriamicrosystems.com/ Austriamicrosystem]. The driver is included in ARMadeus distribution | AS1531 is a 8 channels 12bits analog do digital converter made by [http://www.austriamicrosystems.com/ Austriamicrosystem]. The driver is included in ARMadeus distribution and can be used with the APF51Dev board. | ||
== Soldering == | == Soldering == | ||
AS1531 chip use a SPI bus to communicate with the microprocessor, then to use it on APFx board it must be | AS1531 chip use a SPI bus to communicate with the microprocessor, then to use it on APFx board it must be connected to a SPI bus. | ||
On the APF51Dev, the AS1531 is connected to the SPI1 bus by default. | |||
On the APF27-Dev board it can be soldered on SPI3 bus, which is availbale on connector J8. | |||
{| class="wikitable" style="text-align:center; width:50%;" | {| class="wikitable" style="text-align:center; width:50%;" | ||
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<M> Austria Microsystems AS1531 Analog to Digital Converter | <M> Austria Microsystems AS1531 Analog to Digital Converter | ||
</pre> | </pre> | ||
Then compile the distribution : | Then compile the distribution : | ||
| Line 61: | Line 52: | ||
== Use it == | == Use it == | ||
=== modprobe === | === modprobe === | ||
To use the ADC first load module hwmon and as1531 | To use the ADC first load module hwmon and as1531: | ||
<pre class="apf"> | <pre class="apf"> | ||
# modprobe hwmon | # modprobe hwmon | ||
# modprobe as1531 | # modprobe as1531 | ||
</pre> | </pre> | ||
=== read values === | === read values === | ||
<pre class="apf"> | <pre class="apf"> | ||
# cd /sys/bus/spi/devices/ | # cd /sys/bus/spi/devices/spi0.0/ | ||
# ls | # ls | ||
driver in1_input in4_input in7_input modalias subsystem | driver in1_input in4_input in7_input modalias subsystem | ||
Revision as of 15:24, 26 April 2011
Introduction
AS1531 is a 8 channels 12bits analog do digital converter made by Austriamicrosystem. The driver is included in ARMadeus distribution and can be used with the APF51Dev board.
Soldering
AS1531 chip use a SPI bus to communicate with the microprocessor, then to use it on APFx board it must be connected to a SPI bus.
On the APF51Dev, the AS1531 is connected to the SPI1 bus by default.
On the APF27-Dev board it can be soldered on SPI3 bus, which is availbale on connector J8.
| J8 pin | AS1531 pin |
|---|---|
| SD1_D0_SPI3_MISO | DOUT |
| SD1_D3_SPI3_SS | CSN |
| SD1_CMD_SPI3_MOSI | DIN |
| SP1_CLK_SPI3_SCLK | SCLK |
Driver
The driver is included in ARMadeus distribution, then to use it, select it :
[ ] $ make linux26-menuconfig
Device Drivers --->
<M> Hardware Monitoring support --->
<M> Austria Microsystems AS1531 Analog to Digital Converter
Then compile the distribution :
[ ] $ make linux26;make
Use it
modprobe
To use the ADC first load module hwmon and as1531:
# modprobe hwmon # modprobe as1531
read values
# cd /sys/bus/spi/devices/spi0.0/ # ls driver in1_input in4_input in7_input modalias subsystem hwmon in2_input in5_input in_max name uevent in0_input in3_input in6_input in_min power
or:
# cd /sys/class/hwmon/hwmon0/device/ # ls driver in1_input in4_input in7_input modalias subsystem hwmon in2_input in5_input in_max name uevent in0_input in3_input in6_input in_min power
To read adc value just «cat» an input :
# cat in5_input 887
All values read are in milivolts.
