This version (23 Sep 2022 15:26) was approved by Ciprian Regus.
Table of Contents
LTC2499 16-channel (eight differential, 24-bit ADC Linux Driver
Supported Devices
Evaluation Boards
Source Code
Status
| Source | Mainlined? |
|---|---|
| git | Accepted, not upstream yet |
Files
| Function | File |
|---|---|
| core driver | ltc2497.c |
| Documentation | lltc,ltc2497.yaml |
Example device tree
| Function | File |
|---|---|
| dts | rpi-ltc2499-overlay.dts |
Driver testing
When configured with channel 0 as voltage output, channel 1 as current output, channel 2 as voltage input and channel 3 as current input, the following structure is created under the corresponding IIO device.
This specifies any shell prompt running on the target
root@analog:/sys/bus/iio/devices/iio:device0# ls -l total 0 -r--r--r-- 1 root root 4096 Sep 22 15:17 dev -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage0_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage0-voltage1_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage10_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage10-voltage11_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage11_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage11-voltage10_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage12_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage12-voltage13_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage13_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage13-voltage12_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage14_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage14-voltage15_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage15_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage15-voltage14_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage1_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage1-voltage0_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage2_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage2-voltage3_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage3_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage3-voltage2_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage4_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage4-voltage5_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage5_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage5-voltage4_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage6_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage6-voltage7_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage7_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage7-voltage6_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage8_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage8-voltage9_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage9_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage9-voltage8_raw -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage_scale -rw-r--r-- 1 root root 4096 Sep 22 15:17 in_voltage-voltage_scale -r--r--r-- 1 root root 4096 Sep 22 15:17 name lrwxrwxrwx 1 root root 0 Sep 22 15:17 of_node -> ../../../../../../../firmware/devicetree/base/soc/i2c@7e804000/ltc2499@76 drwxr-xr-x 2 root root 0 Sep 22 15:17 power lrwxrwxrwx 1 root root 0 Sep 22 15:17 subsystem -> ../../../../../../../bus/iio -rw-r--r-- 1 root root 4096 Sep 22 15:17 uevent
Show device name
This specifies any shell prompt running on the target
root@analog:/sys/bus/iio/devices/iio:device0# cat name ltc2499
Show raw measurement
Description:
Raw measurement of current on channel 0.
This specifies any shell prompt running on the target
root@analog:/sys/bus/iio/devices/iio:device0# cat in_voltage0_raw 16777216
Show scale
Description:
Scale to be applied to the raw measurement of current on channel 0 in order to obtain the actual current.
This specifies any shell prompt running on the target
root@analog:/sys/bus/iio/devices/iio:device0# cat in_voltage_scale 0.000074505
More Information
- IIO mailing list: linux [dash] iio [at] vger [dot] kernel [dot] org
resources/tools-software/linux-drivers/iio-adc/ltc2499.txt · Last modified: 23 Sep 2022 15:25 by Ciprian Regus