请问有人知道vim3板子在ubuntu环境下的ADC怎么用么?
ADC系统节点: /sys/bus/iio/devices/iio\:device0
khadas@Khadas:/sys/bus/iio/devices/iio:device0$ ls
buffer in_voltage2_raw in_voltage6_raw
chan7_mux in_voltage3_input in_voltage7_input
current_timestamp_clock in_voltage3_mean_raw in_voltage7_mean_raw
dev in_voltage3_raw in_voltage7_raw
in_voltage0_input in_voltage4_input in_voltage_scale
in_voltage0_mean_raw in_voltage4_mean_raw name
in_voltage0_raw in_voltage4_raw of_node
in_voltage1_input in_voltage5_input power
in_voltage1_mean_raw in_voltage5_mean_raw scan_elements
in_voltage1_raw in_voltage5_raw subsystem
in_voltage2_input in_voltage6_input uevent
in_voltage2_mean_raw in_voltage6_mean_raw
你上图红色框框的是channel 0
.对应的是
khadas@Khadas:/sys/bus/iio/devices/iio:device0$ ls in_voltage0_*
in_voltage0_input in_voltage0_mean_raw in_voltage0_raw
你可以通过这些节点读取到原始的数据,自己再做转换。注意: 这里外引的ADC是1.8V的,不是3.3V。
这个和其他驱动的操作方式是一样的,把设备节点当做文件处理就行。