General Purposed Io - MSI MS-98M9 Manual

General Purposed IO

1. General Purposed IO – GPIO/DIO
The GPIO port configuration addresses are listed in the following table:
Name IO Port
N_GPI0 0x12
N_GPI1 0x12
N_GPI2 0x12
N_GPI3 0x42
N_GPI4 0x12
N_GPI5 0x12
N_GPI6 0x12
N_GPI7 0x12
Note: GPIO should be accessed through controller device 0x9C on SMBus. The associated access
method in examples (SMBus_ReadByte, SMBus_WriteByte) are provided in part 3.
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 =SMBus_ReadByte (0x9C, 0x21);
val = val | (1<<0);
SMBus_WriteByte (0x9C, 0x21, val);
Example: Set N_GPO1 output "low"
val = SMBus_ReadByte (0x9C, 0x21);
val = val & (~(1<<1));
SMBus_WriteByte (0x9C, 0x21, val);
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 = SMBus_ReadByte (0x9C, 0x12);
val = val & (1<<2);
IO address Name
Bit 0 N_GPO0
Bit 1 N_GPO1
Bit 2 N_GPO2
Bit 3 N_GPO3
Bit 4 N_GPO4
Bit 5 N_GPO5
Bit 6 N_GPO6
Bit 7 N_GPO7
// Read value from N_GPO0 port through SMBus.
// Set N_GPO0address (bit 0) to 1 (output "high").
// Write back to N_GPO0 port through SMBus.
// Read value from N_GPO1 port through SMBus..
// Set N_GPO1 address (bit 1) to 0 (output "low").
// Write back to N_GPO1 port through SMBus.
// Read value from N_GPI2 port through SMBus.
// Read N_GPI2 address (bit 2).
IO Port IO address
0x21 Bit 0
0x21 Bit 1
0x21 Bit 2
0x21 Bit 3
0x21 Bit 4
0x21 Bit 5
0x21 Bit 6
0x21 Bit 7
MS-98M9
A-3