K64f ethernet conflict with uart3 ptc16,17

Mbed OS
1

It seems i cannot use the uart3 ptc16,17 as an input whilst employing the ethernet port.
If it were an arduino device i would use software serial.
Is there a way to do this in mbed? Or any other fix?

Thanks in advance for any help
George

2

Due to a clock config conflict, the default config does not allow Ethernet and UART3 to be used at the same. See this thread.

A workaround for Mbed projects is to disable PORTC clock in mbed-os/features/netsocket/emac-drivers/TARGET_Freescale_EMAC/TARGET_K64F/hardware_init_MK64F12.c.

// CLOCK_EnableClock(kCLOCK_PortC);             // commented
CLOCK_EnableClock(kCLOCK_PortB);
/* Affects PORTC_PCR16 register */
// PORT_SetPinMux(PORTC, 16u, kPORT_MuxAlt4);   // commented
/* Affects PORTC_PCR17 register */
// PORT_SetPinMux(PORTC, 17u, kPORT_MuxAlt4);   // commented
/* Affects PORTC_PCR18 register */
// PORT_SetPinMux(PORTC, 18u, kPORT_MuxAlt4);   // commented
/* Affects PORTC_PCR19 register */
// PORT_SetPinMux(PORTC, 19u, kPORT_MuxAlt4);   // commented
/* Affects PORTB_PCR1 register */
PORT_SetPinMux(PORTB, 1u, kPORT_MuxAlt4);

This trick works for my application.