7.13.3. 调试指南¶

7.13.3.1. 调试开关¶

在luban根目录下执行 make kernel-menuconfig，进入kernel的功能配置，可以打开PSADC模块的DEBUG选项：

Linux
    Kernel hacking
        Artinchip Debug
            [*] PSADC driver debug

此DEBUG选项打开的影响：

PSADC 驱动以-O0编译
PSADC 的pr_dbg()和dev_dbg()调试信息会被编译

在系统运行时，如果要打印pr_dbg()和dev_dbg()信息，还需要调整loglevel为8，两个方法：

在board.dts中修改bootargs，增加“loglevel=8”
在板子启动到Linux shell后，执行命令：

echo 8 > /proc/sys/kernel/printk

7.13.3.2. Sysfs 节点¶

IIO子系统会为ADC设备创建一组标准的Sysfs节点文件，可用于读取ADC的数值。

# cd /sys/devices/platform/soc/18210000.psadc/iio:device0
/sys/devices/platform/soc/18210000.psadc/iio:device0 # ls
dev                         in_voltage5_raw
events                      in_voltage5_raw_available
in_voltage0_raw             in_voltage6_raw
in_voltage0_raw_available   in_voltage6_raw_available
in_voltage10_raw            in_voltage7_raw
in_voltage10_raw_available  in_voltage7_raw_available
in_voltage11_raw            in_voltage8_raw
in_voltage11_raw_available  in_voltage8_raw_available
in_voltage1_raw             in_voltage9_raw
in_voltage1_raw_available   in_voltage9_raw_available
in_voltage2_raw             in_voltage_scale
in_voltage2_raw_available   name
in_voltage3_raw             of_node
in_voltage3_raw_available   power
in_voltage4_raw             subsystem
in_voltage4_raw_available   uevent
# cat in_voltage7_raw
# 4095