mstar 平台GPIO在线调试

1. GPIO状态

cat  /sys/kernel/debug/gpio

可以看到所有当年GPIO口的状态，输入输出模式，输出高/低

gpiochip0: GPIOs 0-115, gpio:
 gpio-0   (                    |sysfs               ) in  hi    
 gpio-1   (                    |sysfs               ) in  hi    
 gpio-2   (                    |sysfs               ) out hi    
 gpio-3   (                    |sysfs               ) in  hi    
 gpio-4   (                    |sysfs               ) in  hi    
 gpio-5   (                    |sysfs               ) out lo    
 gpio-6   (                    |sysfs               ) in  hi    
 gpio-7   (                    |sysfs               ) out hi    
 gpio-8   (                    |sysfs               ) out hi    
 gpio-9   (                    |sysfs               ) in  hi    
 gpio-10  (                    |sysfs               ) out lo    
 gpio-11  (                    |sysfs               ) in  hi    
 gpio-12  (                    |sysfs               ) in  hi    
 gpio-13  (                    |sysfs               ) out hi    
 gpio-14  (                    |sysfs               ) in  hi    
 gpio-15  (                    |sysfs               ) in  hi    
 gpio-16  (                    |sysfs               ) out lo    
 gpio-17  (                    |sysfs               ) out hi    
 gpio-18  (                    |sysfs               ) out lo    
 gpio-19  (                    |sysfs               ) out lo    
 gpio-20  (                    |sysfs               ) in  hi    
 gpio-21  (                    |sysfs               ) in  lo    
 gpio-22  (                    |sysfs               ) in  lo    
 gpio-23  (                    |sysfs               ) in  hi    
 gpio-24  (                    |sysfs               ) in  hi    
 gpio-25  (                    |sysfs               ) in  hi    
 gpio-26  (                    |sysfs               ) in  hi    
 gpio-27  (                    |sysfs               ) in  lo    
 gpio-28  (                    |sysfs               ) in  lo    
 gpio-29  (                    |sysfs               ) in  hi    
 gpio-30  (                    |sysfs               ) in  hi    
 gpio-31  (                    |sysfs               ) out hi    
 gpio-32  (                    |sysfs               ) in  hi    
 gpio-33  (                    |sysfs               ) in  hi    
 gpio-34  (                    |sysfs               ) in  hi    
 gpio-35  (                    |sysfs               ) out lo    
 gpio-36  (                    |sysfs               ) out lo    
 gpio-37  (                    |sysfs               ) out lo    
 gpio-38  (                    |sysfs               ) out lo    
 gpio-39  (                    |sysfs               ) in  lo    
 gpio-40  (                    |sysfs               ) in  hi    
 gpio-41  (                    |sysfs               ) in  hi    
 gpio-42  (                    |sysfs               ) in  hi    
 gpio-43  (                    |sysfs               ) in  hi    
 gpio-44  (                    |sysfs               ) in  hi    
 gpio-45  (                    |sysfs               ) in  hi    
 gpio-46  (                    |sysfs               ) in  hi    
 gpio-47  (                    |sysfs               ) in  hi    
 gpio-48  (                    |sysfs               ) in  hi    
 gpio-49  (                    |sysfs               ) in  hi    
 gpio-50  (                    |sysfs               ) in  hi    
 gpio-51  (                    |sysfs               ) in  hi    
 gpio-52  (                    |sysfs               ) in  lo    
 gpio-53  (                    |sysfs               ) in  hi    
 gpio-54  (                    |sysfs               ) in  hi    
 gpio-55  (                    |sysfs               ) out hi    
 gpio-56  (                    |sysfs               ) in  hi    
 gpio-57  (                    |sysfs               ) in  hi    
 gpio-58  (                    |sysfs               ) in  hi    
 gpio-59  (                    |sysfs               ) in  hi    
 gpio-60  (                    |sysfs               ) in  hi    
 gpio-61  (                    |sysfs               ) in  hi    
 gpio-64  (                    |sysfs               ) out lo    
 gpio-65  (                    |sysfs               ) out hi    
 gpio-66  (                    |sysfs               ) out hi    
 gpio-67  (                    |sysfs               ) out hi    
 gpio-68  (                    |sysfs               ) in  hi    
 gpio-69  (