ioctl

wangtsungli — Fri, 09 Sep 2016 09:10:12 GMT

I'm using MQX4.0 to work my touch panel, but i stock at the function ioctl(tchscr_dev_ptr->ADC_CHANNEL_X, ADC_IOCTL_FIRE_TRIGGER, (pointer) tchscr_dev_ptr->ADC_CHANNEL_X_STRUCT->trigger)!

I don't know how this function work, please help me on this problem!

Best regard

Victor

Re: ioctl

danielchen — Mon, 12 Sep 2016 08:22:28 GMT

Hi Wang:

The two IOCTL commands is to use two different ADC modules to read X/Y axis.

ioctl(tchscr_dev_ptr->ADC_CHANNEL_X, ADC_IOCTL_FIRE_TRIGGER, (pointer) tchscr_dev_ptr->ADC_CHANNEL_X_STRUCT->trigger)

will call function _adc_ioctl (mqx/source/io/adc) , case ADC_IOCTL_FIRE_TRIGGER.

I assume you are using Kinties MCU, the function will then call function _adt_trigger (mqx/source/io/adc/kadc),

starts channel measurement , and get the adc value.

You can read the chapter 8 ADC driver in MQX_IO_User_Guide.pdf for more details about ADC. This file located in MQX installation folder.

Freescale_MQX_4_0\doc\mqx\MQX_IO_User_Guide.pdf

Regards

Daniel

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