Reading GPIO output state

dan_quist — Sat, 16 Jun 2012 01:00:17 GMT

Hi,

Does MQX support reading the the state of an ouput GPIO pin? Of course I can keep track manually which pins are set or not, but I find it surprising that there's not a method to do this through the GPIO driver.

Maybe I'm missing something? I tried GPIO_IOCTL_READ, but that command is only valid for input pins.

Re: Reading GPIO output state

KJFPE — Mon, 18 Jun 2012 14:48:21 GMT

Hi
What I did on the K60 tower system to read a button I used lwgpio_get_value

// Setup the button
if (!lwgpio_init(&btn1, BSP_BUTTON1, LWGPIO_DIR_INPUT, LWGPIO_VALUE_NOCHANGE))
{
DEBUG_OUT("Initializing button GPIO as input failed.\n");
}

lwgpio_set_functionality(&btn1, BSP_BUTTON1_MUX_GPIO);
lwgpio_set_attribute(&btn1, LWGPIO_ATTR_PULL_UP, LWGPIO_AVAL_ENABLE);

// Then some where else you can now read the state of the button

/************************************************************************/
/* Read Switch */
/************************************************************************/
int_16 Read ()
{
int_16 result=-1;

if (LWGPIO_VALUE_HIGH == lwgpio_get_value(&btn1))
{
DEBUG_OUT("Button IDLE");
result = 1;
}
else
{
DEBUG_OUT("Button PRESSED");
result = 0;
}
}

Hope this helps

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Reading GPIO output state

Re: Reading GPIO output state