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--- products:sbc:common:applications:gpio:adc [2022/12/02 08:00]
ivan
+++ products:sbc:common:applications:gpio:adc [2022/12/21 21:28] (current)
ivan
@@ Line 1: / Line 1: @@
-~~tag>Edge2 ADC~~
-====== Edge2 ADC ======
-{{page>products:sbc:common:applications:gpio:adc&noheader}}
-===== Introduction =====
-The previous part of this page introduces ADC related information.The second part guides you to obtain ADC conversion values.
-<WRAP important >
-For Edge2, in order to use the ADC function, you need to attach the IO extension board.
-</WRAP>
-===== ADC Information =====
-<WRAP info >
-The ADC is an 12-bit Successive Approximation Register (SAR) A/D Converter.It converts the analog input signal into 12-bit binary digital codes at maximum conversion rate of 1MSPS with 20MHz A/D converter clock. The input range is typically 0V to 1.8V.
-</WRAP>
-|           ^  ADC       ^  PIN  ^   GPIO Name  ^
-^  Edge2    |  ADC_CH2   |   9   |  SARADC_IN4  |
-===== ADC conversion =====
-Connect the expansion board correctly, and input the voltage value between 0V and 1.8V for pin 9.Through this device node.Read the ADC conversion value.
-```shell
-$ cd /sys/bus/iio/devices/iio:device0
-$ ls
-buffer           in_voltage2_raw  in_voltage6_raw   of_node        trigger
-dev              in_voltage3_raw  in_voltage7_raw   power          uevent
-in_voltage0_raw  in_voltage4_raw  in_voltage_scale  scan_elements
-in_voltage1_raw  in_voltage5_raw  name              subsystem
-$ cat in_voltage4_raw                                             //pin9 connect GND
-
-```

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