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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
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<<2);
SMBus_WriteByte (0x6E, 0x21, val);
Example: Set N_GPO1 output "low"
val = SMBus_ReadByte (0x6E, 0x11);
val = val & (~(1<<4));
SMBus_WriteByte (0x6E, 0x11, 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, 0x22);
val = val & (1<<0);
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, 0x22);
val = val & (1<<1);
if (val)
printf ("Input of N_GPI3 is High");
else
printf ("Input of N_GPI3 is Low");
IO Port
IO address
0x12
Bit 6
0x12
Bit 7
0x22
Bit 0
0x22
Bit 1
// Read value from N_GPI2 port through SMBus.
// Read N_GPI2 address (bit 0).
// Read value from N_GPI3 port through SMBus.
// Read N_GPI3 address (bit 1).
Name
IO Port
N_GPO0
0x21
N_GPO1
0x11
N_GPO2
0x11
N_GPO3
0x11
// Read value from N_GPO0 port through SMBus.
// Set N_GPO0address (bit 2) 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 4) to 0 (output "low").
// Write back to N_GPO1 port through SMBus.
GPIO WDT SMBus Access Programming
IO address
Bit 2
Bit 4
Bit 0
Bit 1
65
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