Moxa Technologies EM-1240-LX Manuale Utente Scaricare il pdf (Pagina 50)

EM-1240-LX User’s Manual EM-1240-LX Device API

typedef struct gpio_set_struct {

int io_number;

int mode_data;

} gpio_t;

* To get the GPIO mode now.

* Input: unsigned int pio - the GPIO number, from 0 to MAX_GPIO-1

* Output: < 0 - some error

* 1 - input

* 0 - ouput

int get_gpio_mode(unsigned int gpio_no)

{

int fd;

gpio_t pset;

CHECK_GPIO_NO(gpio_no);

fd = open(GPIO_DEVICE_NODE, O_RDWR);

if ( fd < 0 )

return GPIO_NODE_ERROR;

pset.io_number = gpio_no;

if ( ioctl(fd, IOCTL_GPIO_GET_MODE, &pset) != 0 ) {

close(fd);

return GPIO_ERROR;

}

close(fd);

return pset.mode_data;

}

* To get the GPIO data now.

* Input: unsigned int pio - the GPIO number, from 0 to MAX_GPIO-1

* Output: < 0 - some error

* 1 - high

* 0 - low

int get_gpio_data(unsigned int gpio_no)

{

int fd;

gpio_t pset;

CHECK_GPIO_NO(gpio_no);

fd = open(GPIO_DEVICE_NODE, O_RDWR);

if ( fd < 0 )

return GPIO_NODE_ERROR;

pset.io_number = gpio_no;

if ( ioctl(fd, IOCTL_GPIO_GET_DATA, &pset) != 0 ) {

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Moxa Technologies EM-1240-LX Manuale Utente Pagina 50