¶ Preface
SARADC is a 6-channel 10-bit effective digital-to-analog converter. When the input frequency is 13MHz, the conversion speed is 1MSPS.
¶ adc pin
Hot Wheels Technology has developed a rk3588s motherboard, youyeetoo R1, which provides 40pin expansion pins, including 1 CAN pin. The pin distribution is shown in the figure below:
¶ shell command call
If you want to use shell commands in the Android system, you need to enter the Android command line window through ADB. For tutorials on using ADB, please refer to the adb debugging chapter. After opening the Android system command line through adb.
adb root
adb shell
¶ Test adc function
Here we take the ADC3 pin in the picture as an example.
- Use a Dupont wire to short-circuit this pin to GND and enter the following command
cat /sys/bus/iio/devices/iio\:device0/in_voltage3_raw
- Then short-circuit the Dupont line to 3.3V and enter the following command. Note that the no-load voltage of the ADC pin of rk3588s is 3.3V. When in use, do not test voltages exceeding 3.3V.
cat /sys/bus/iio/devices/iio\:device0/in_voltage3_raw
- The two readings are different, and the ADC function is normal.