MSI MS-9A76, Руководство пользователя, Страница: 86 / 88

A-4
WDT, GPIO, DIO MS-9A76
GPIO Sample Code
2. General Purposed IO – GPIO/DIO
The GPIO port configuration addresses are listed in the following table:
Name IO Port IO address Name IO Port IO address
N_GPI0 0xA05 Bit 7 N_GPO0 0xA05 Bit 3
N_GPI1 0xA05 Bit 2 N_GPO1 0xA05 Bit 4
N_GPI2 0xA05 Bit 1 N_GPO2 0xA05 Bit 5
N_GPI3 0xA05 Bit 0 N_GPO3 0xA05 Bit 6
2.1 Set output value of GPO
1. Read the value from GPO port.
2. Set the value of GPO address.
3. Write the value back to GPO port.
Example: Set N_GPO0 output “high”
val = Inportb ( 0xA05 ); // Read value from N_GPO0 port.
val = val | (1<< 3 ); // Set N_GPO0 address (bit 3) to 1 (output
“high”).
Outportb ( 0xA05 , val); // Write back to N_GPO0 port.
Example: Set N_GPO1 output “low”
val = Inportb ( 0xA05 ); // Read value from N_GPO1 port.
val = val & (~(1<< 4 )); // Set N_GPO1 address (bit 4) to 0 (output
“low”).
Outportb ( 0xA05 , val); // Write back to N_GPO1 port.
2.2 Read input value from GPI
1. Read the value from GPI port.
2. Get the value of GPI address.
Example: Get N_GPI2 input value.
val = Inportb ( 0xA05 ); // Read value from N_GPI2 port.
val = val & (1<< 1 ); // Read N_GPI2 address (bit 1).
if (val) printf (“Input of
N_GPI2
is High”);
else printf (“Input of N_GPI2 is Low”);