Advantech ITA-5831 Series User Manual page 78

Intel the 6rd generation core i processor fanless system for railway applications

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GPIO Simcodes

(take GPIO 00 and GPIO 07 as an example)

Output High to GPIO 00:

data = smbus_read_byte(0x40, 0x03); //Read slave 0x40 register 3 byte

data &= 0xfe;//Set bit 0 as 0

smbus_write_byte(0x40, 0x03, data)//write, set GPIO 00 as Output

data = smbus_read_byte(0x40, 0x01) //Read slave 0x40 register 1

data |= 0x01; //Set bit 0 as 1, High

smbus_write_byte(0x40, 0x01, data) //Write, 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 as 1

smbus_write_byte(0x40, 0x03,data) //Write, set GPIO 07 as Input

data = smbus_read_byte(0x40, 0x00) //Read slave 0x40 register

0. Then, the response value of bit 7 should know whether the input is

low or high

ITA-5831 User Manual

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