Differences

This shows you the differences between two versions of the page.

--- products:sbc:vim4:applications:gpio:adc [2022/09/19 04:41]
nick
+++ products:sbc:vim4:applications:gpio:adc [2023/07/25 22:03]
nick
@@ Line 3: / Line 3: @@
 ====== VIM4 ADC ======
+===== Introduction =====
-{{page>products:sbc:common:applications:gpio:adc&noheader}}
+This documentation will introduce the usage of ADC.
+===== Hardware Information =====
+The ADC  is a 12-bit successive approximation register (SAR) A/D Converter.
+^  Pin  ^ SIGNAL  ^  Voltage  ^  Device Node                                       ^
+|  10   | ADC_CH6 |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage6_raw  |
+|  12   | ADC_CH3 |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage3_raw  |
+===== Get Raw ADC Value =====
+<WRAP important >
+Replace the variable ''x'' in ''in_voltageX''raw with the corresponding channel value
+</WRAP>
+```shell
+$ cat /sys/bus/iio/devices/iio:device0/in_voltageX_raw
+```
+The following uses PIN10 as an example.
+```shell
+$ cat /sys/bus/iio/devices/iio:device0/in_voltage6_raw     // PIN10 is connected to 1.8V
+
+$ cat /sys/bus/iio/devices/iio:device0/in_voltage6_raw    // PIN10 connects to GND
+
+```
+Convert the raw ADC value to Voltage:
+''Voltage = (value / 4096) * 1.8V''

Khadas Docs