Kinetis Software Development KitのトピックRe: fsl_gpio_driver incorrectly outputs to GPIO pin prior to setting the default output logic.

fsl_gpio_driver incorrectly outputs to GPIO pin prior to setting the default output logic.

lucianomoretti — Thu, 10 Dec 2015 21:07:52 GMT

In the GPIO_DRV_OutputPinInit() function located in fsl_gpio_driver.c, the function calls the GPIO_HAL_SetPinDir() function that enables the pin prior to setting up the GPIO output features.

If an output is set to active low, it will be active as soon as the GPIO_HAL_SetPinDir() function is called, prior to the GPIO_HAL_WritePinOutput() call with the outputPin->config.outputLogic of 1.

Calling GPIO_HAL_WritePinOutput() prior to GPIO_HAL_SetPinDir() appears to correct the issue.

Re: fsl_gpio_driver incorrectly outputs to GPIO pin prior to setting the default output logic.

Alice_Yang — Fri, 11 Dec 2015 06:15:06 GMT

Hello Luciano,

Yes , in my personal opinion, you are right .

Strictly speaking, we should first configure the logic level(0 or 1) , then set the gpio to output direction.

You can change the two HAL function position , then build the ksdk_platform_lib again, then use the function :

GPIO_DRV_OutputPinInit() .

Hope it helps

Have a great day,
Alice

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: fsl_gpio_driver incorrectly outputs to GPIO pin prior to setting the default output logic.

lucianomoretti — Fri, 11 Dec 2015 14:36:43 GMT

I've already reworked the order slightly. This bug actually causes our board to go into a reset loop, as it turns on components that draw too much power before we can negotiate more power over the USB connection.

Re: fsl_gpio_driver incorrectly outputs to GPIO pin prior to setting the default output logic.

Alice_Yang — Mon, 14 Dec 2015 03:00:41 GMT

Hi Luciano,

Sorry for the inconvenient to you !

Alice