Kinetis Software Development KitのトピックRe: Reading a Port as a set of parallel bits

Reading a Port as a set of parallel bits

davepfaltzgraff — Thu, 30 Jun 2016 20:06:19 GMT

In KSDK1, I was able to read a port as a set or parallel bits using the GPIO_HAL_ReadPortInput(FP_BASE) function.

It appears that in KSDK2, this has been removed and I can only find routines to read individual bits on the port using the GPIO_ReadPinInput(FP_BASE, PIN_NO) routine.

How can I read the set if bits in KSDK2?

Re: Reading a Port as a set of parallel bits

xiangjun_rong — Fri, 01 Jul 2016 02:19:56 GMT

Hi, David,

This is the api function GPIO_ReadPinInput() body:

static inline uint32_t GPIO_ReadPinInput(GPIO_Type *base, uint32_t pin)

{

return (((base->PDIR) >> pin) & 0x01U);

}

You see that the function only read the specified bit instead of all the bits in PDIR register.

If you want to read all the PDIR register, you can define a function yourself.

for example

static inline uint32_t GPIO_ReadInput(GPIO_Type *base)

{

return (base->PDIR);

}

Hope it can help you.

XiangJun Rong

Re: Reading a Port as a set of parallel bits

davepfaltzgraff — Fri, 01 Jul 2016 17:43:14 GMT

Hi XiangJun Rong,

That's what I had thought, but when I tried it, I didn't get the results I expected. My problem was some code brought in from an old project that was driving the pins low when I expected them to be inputs. Now that I have eliminated that code, the system is now operating as expected.

Thanks,

Dave