rk3288要定义一个recovery key要如何确定keyValueLow、keyValueHigh的值？

Question

__maybe_unused static void RockusbKeyInit(void)
{

key_rockusb.key.adc.keyValueLow = 0; 
key_rockusb.key.adc.keyValueHigh = 30; 

}

__maybe_unused static void RecoveryKeyInit(void)
{

key_recovery.key.adc.keyValueLow =  0; 
key_recovery.key.adc.keyValueHigh =  30; 

}

用getevent读取出来的按键值是0x73，即115，该按键有串联一个1K电阻。请问该如何确定keyValueLow、keyValueHigh的值？