Differences

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--- products:sbc:vim3:applications:gpio:adc [2022/12/21 21:29]
ivan
+++ products:sbc:vim3:applications:gpio:adc [2022/12/21 21:29] (current)
ivan [VIM3/3L ADC]
@@ Line 3: / Line 3: @@
 ====== VIM3/3L ADC ======
+===== Introduction =====
+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_CH0 |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage0_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_voltage0_raw     // pin10 is connected to 1.8V
+$ cat /sys/bus/iio/devices/iio:device0/in_voltage0_raw    // pin10 connects to GND
+```
+Convert the raw ADC value to Voltage:
+''Voltage = (value / 4096) * 1.8V''

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