Legal Removal Request

Post: Hi Dave I tried your code and the interrupt is triggering but where your loop is repeating every 0.2 seconds it only flashed up on the screen for a fraction of a second before disappearing again so it was easy to miss. I have translated the interrupt demo from our python library to C. [pre][code]#include #include #include #include #include "ABE_IoPi.h" void clearscreen () { printf("\033[2J\033[1;1H"); } int main(int argc, char **argv) { setvbuf(stdout, NULL, _IONBF, 0); // needed to print to the command line // initialise one of the io pi buses on i2c address 0x20, default address for bus 1 IOPi_init(0x20); // Set all pins on the IO bus to be inputs with internal pull-ups enabled. set_port_pullups(0x20, 0, 0xFF); set_port_pullups(0x20, 1, 0xFF); set_port_direction(0x20, 0, 0xFF); set_port_direction(0x20, 1, 0xFF); // Invert both ports so pins will show 1 when grounded invert_port(0x20, 0, 0xFF); invert_port(0x20, 1, 0xFF); // Set the interrupt polarity to be active high and mirroring disabled, so // pins 1 to 8 trigger INT A and pins 9 to 16 trigger INT B set_interrupt_polarity(0x20, 1); mirror_interrupts(0x20, 0); // Set the interrupts default value to 0x00 so the interrupt will trigger when any pin registers as true set_interrupt_defaults(0x20, 0, 0x00); set_interrupt_defaults(0x20, 1, 0x00); // Set the interrupt type to be 1 for ports A and B so an interrupt is // fired when the pin does not match the default value set_interrupt_type(0x20, 0, 0xFF); set_interrupt_type(0x20, 1, 0xFF); // Enable interrupts for all pins set_interrupt_on_port(0x20, 0, 0xFF); set_interrupt_on_port(0x20, 1, 0xFF); while (1){ // read the interrupt status for each port. // If the status is not 0 then an interrupt has occured on one of the pins // so read the value from the interrupt capture. if (read_interrupt_status(0x20, 0) != 0){ printf("Port 0: %x \n", read_interrupt_capture(0x20,0)); } if (read_interrupt_status(0x20, 1) != 0){ printf("Port 1: %x \n", read_interrupt_capture(0x20,1)); } usleep(200000); // sleep 0.2 seconds } return (0); }[/code][/pre] The difference between this and your code is I changed the interrupt type to be 1 on each pin so it will fire when the pin does not match the default value and I changed the while loop so on each loop the interrupt status for each port is checked and it only prints the result if the interrupt has fired. I used the read_interrupt_capture() function to get the value of the interrupt when it fired and print that to the display. When the code runs it will print the status repeatedly when a pin is connected to ground. If you only want it to print when the pin state changes change the set_interrupt_type(0x20, 0, 0xFF); to set_interrupt_type(0x20, 0, 0x00); I have uploaded a copy of the c code to our GitHub repository at [url=https://github.com/abelectronicsuk/ABElectronics_C_Libraries/blob/master/IOPi/demos/demo-iopiinterrupt.c]demo-iopiinterrupt.c[/url]