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Can't control GPIO_PORT_C | GPIO_PIN3 in MQX 4.2.0 on K60F120M

Question asked by Jesper Evertsson on Jun 25, 2015
Latest reply on Jun 25, 2015 by Jesper Evertsson

Hi, I'm having some trouble with the GPIO_PORT_C | GPIO_PIN3 on the K60F120M in MQX 4.2.0. Whenever I try to use it as an input and read it's value or when I try to use it as an output and give it a value it always has an unspeccified value when we control it with an Oscillioscope. The code looks exatly the same as for the other Pins I'm using (except for the pin number of course) and with them I'm having no problems. I tried to find if MQX have another defualt usage for that Pin but the only thing I could find was the RX function for UART 1. I have both BSPCFG_ENABLE_TTYB and BSPCFG_ENABLE_ITTYB set to 0 in my user_config file so it sohuldn't even be used and I even tried to remove the pctl->PCR[3] = 0 | PORT_PCR_MUX(3) | PORT_PCR_DSE_MASK; line from init_gpio.c but that didn't help either.


So, does anyone know if the PTC3 pin has another default usage that could interfer when I try to use it as an input GPIO?