General Purpose Io - MSI MS-CF05-SKU1 User Manual

General Purpose IO

1. General Purposed IO – GPIO/DIO
The GPIO port configuration addresses are listed in the following table:
Name
N_GPI0
N_GPI1
N_GPI2
N_GPI3
N_GPI4
N_GPI5
N_GPI6
N_GPI7
Note: GPIO should be accessed through controller device 0x6E 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 (0x6E, 0x21);
val = val | (1<<0);
SMBus_WriteByte (0x6E, 0x21, val);
Example: Set N_GPO1 output "low"
val = SMBus_ReadByte (0x6E, 0x21);
val = val & (~(1<<1));
SMBus_WriteByte (0x6E, 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 (0x6E, 0x12);
val = val & (1<<2);
if (val) printf ("Input of N_GPI2 is High");
else printf ("Input of N_GPI2 is Low");
Example: Get N_GPI3 input value.
val = SMBus_ReadByte (0x6E, 0x42);
val = val & (1<<3);
IO Port IO address
0x12 Bit 0
0x12 Bit 1
0x12 Bit 2
0x42 Bit 3
0x12 Bit 4
0x12 Bit 5
0x12 Bit 6
0x12 Bit 7
// Read value from N_GPI2 port through SMBus.
Name IO Port
N_GPO0
0x21
N_GPO1 0x21
N_GPO2 0x21
N_GPO3 0x21
N_GPO4 0x21
N_GPO5 0x21
N_GPO6 0x21
N_GPO7
0x21
// 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 N_GPI2 address (bit 2).
GPIO WDT BKL Programming
// Read value from N_GPI3 port through SMBus.
// Read N_GPI3 address (bit 3).
IO address
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
63