Hello,I'm trying to programming the IO PI PLUS with C language.My hello world program is a blinking led! I have jumpered correctly the IO PI PLUS board:0x20 bus10x21 bus2If I try to use 0x20 address all works correctly, but when I change it to 0x21 I have no the same result! :(This is my C code:#include <ABE_IoPi.h>int main(int argc, char **argv){ IOPi_init(0x21); // initialise one of the io pi buses on i2c address 0x21 set_port_direction(0x21,0, 0x00); // set the direction for bank 0 to be outputs set_port_direction(0x21,1, 0x00); // set the direction for bank 1 to be outputs write_port(0x21,1, 0xFF); while (1){ write_pin(0x21,0x1, 1); // turn pin 1 on and off at 1 second intervals usleep(1000000); write_pin(0x21,0x1, 0); usleep(1000000); } return (0);}I tried to use a python equivalent code and with this one, the 0x21 bus address works correctly.My led is blinking!#!/usr/bin/pythonfrom ABE_helpers import ABEHelpersfrom ABE_IoPi import IoPiimport timei2c_helper = ABEHelpers()i2c_bus = i2c_helper.get_smbus()bus = IoPi(i2c_bus, 0x21)bus.set_port_direction(0, 0x00)bus.write_port(0, 0x00)while True: bus.write_pin(1, 1) time.sleep(1) bus.write_pin(1, 0) time.sleep(1)Could you please let me know what's is wrong in my C code?thanksrs232.

Hello

I just tried your code on an IO Pi Plus and it appears to be working correctly. Pin 1 on bus 2 was switching on and off.

Can you please check that you are using the most recent version of the IO Pi C library from our GitHub repository?

Hello Andrew,thanks for your reply.I think to have cloned last github version. But I'll check.Do you know some difference?rs232

There was a bug with an earlier version of the library where it would not select the correct chip when writing to the IO Pi.

Hello Andrew,thanks for your reply.You were right, with the last github version it works!Many thanksrs232