Advantech ITA-1611 Series, User Manual

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55 ITA-1611 User Manual
Chapter 6
G
PIO Programming
Guide
(Take GPIO 00 and GPIO 07 in Chapter 2 for example)
GPIO 00 output High:
data = smbus_read_byte(0x40, 0x03); //Read slave 0x40 register 3 byte
data &= 0xfe; //Set bit 0 to 0
smbus_write_byte(0x40, 0x03, data) //Write back, GPIO 00 is set to Output
data = smbus_read_byte(0x40, 0x01) //Read slave 0x40 register 1
data |= 0x01; //Set bit 0 to 1, which means High
smbus_write_byte(0x40, 0x01, data) //Write back, output High value
Read Input value from GPIO 07:
data = smbus_read_byte(0x40, 0x03); //Read slave 0x40 register 3 byte
data |= 0x80; //Set bit 7 to 1
smbus_write_byte(0x40, 0x03, data) //Write back,GPIO 07 is set to Input
data = smbus_read_byte(0x40, 0x00) //Read slave 0x40 register 0.
Response value of bit 7 can determine whether Input is Low or High