Acrosser AIV-HM76V1FL - Manual (Page 56)

AIV-HM76V1FL Series User Manual
56 Acrosser Technology Co., Ltd.
5.2.2. GPIO and Watchdog
5.2.2.1. GPIO
Syntax: i32 getChLevel(u8 *val)
Description: Get the status of GPIO input pins and output pins, and put
the value at *val.
Parameters: This function takes a pointer to an unsigned char variable
as the parameter.
The bit0 ~ bit3 in the pointed variable ‘*val’ is the status of
the output pins. The bit4 ~ bit7 in the pointed variable ‘*val’
is the status of the input pins.
For example:
u8 val;
i32 result;
result = getChLevel( &val);
if(result != 0)
printf(“Fail to get GPIO status!\n”);
Return Value: If the function gets the value successfully, it returns 0, any
other returned value stands for error.
Syntax: i32 setChLevel(u8 val)
Description: Set the status of GPIO Output pins.
Parameters: This function takes an unsigned char as the parameter.
The bit0 ~ bit3 in variable ‘val’ represent the status of the
output pins. The bit3 ~ bit7 in the variable ‘val’ are of no
use and can be neglected.
For example:
u8 val = 0xf;
i32 result;
result = setChLevel(val);
if(result != 0)
printf(“Fail to set GPIO!\n”);
Return Value: If the function sets the values successfully, it returns 0,
any other returned value stands for error.