MSI 939-9A79-002, Руководство пользователя, Страница: 69 / 72

A-3
GPIO WDT BKL Programming MS-9A79
General Purposed IO
1. 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 3
N_GPO0
0xA10 Bit 0
N_GPI1 0xA05 Bit 4 N_GPO1 0xA10 Bit 1
N_GPI2 0xA05 Bit 5 N_GPO2 0xA10 Bit 2
N_GPI3 0xA05 Bit 6 N_GPO3 0xA10 Bit 3
N_GPI4 0xA05 Bit 0 N_GPO4 0xA10 Bit 4
N_GPI5 0xA05 Bit 7 N_GPO5 0xA10 Bit 5
N_GPI6 0xA05 Bit 2 N_GPO6 0xA10 Bit 6
N_GPI7 0xA05 Bit 1 N_GPO7 0xA10 Bit 7
1.1 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 ( 0xA10 ); // Read value from N_GPO0 port.
val = val | (1<< 0 ); // Set N_GPO0 address (bit 0) to 1 (output “high”).
Outportb ( 0xA10 , val); // Write back to N_GPO0 port.
Example: Set N_GPO1 output “low”
val = Inportb ( 0xA10 ); // Read value from N_GPO1 port.
val = val & (~(1<< 1 )); // Set N_GPO1 address (bit 1) to 0 (output “low”).
Outportb ( 0xA10 , val); // Write back to N_GPO1 port.
1.2 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<< 5 ); // Read N_GPI2 address (bit 5).
if (val) printf (“Input of N_GPI2 is High”);
else printf (“Input of N_GPI2 is Low”);