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UART Flow control, K64

Question asked by roymessinger on Mar 14, 2017
Latest reply on Mar 16, 2017 by roymessinger

From looking at various posts, I've understood there is no HW flow support for UART. I'm working with KSDK 2.1 (I've read no support for earlier versions).

Nevertheless, in MK64F12.h there's:

/* @brief Hardware flow control (RTS, CTS) is supported. */
#define FSL_FEATURE_UART_HAS_MODEM_SUPPORT (1)

 

1. So, does it mean there is HW Flow support?

2. How do I use it?

I  connected TX_Enable to pin 71, PTC1 (UART1_RTS), still I do not get any uart interrupt... (Where as in FRDM board all is ok). I defined this pin to be a UART1_RTS functionality)

Any idea?

 

Update:

See more info below. It seems the RTS is high (even though I tried changing its polarity), and by that avoiding data from being received by the chip. Mystery....

Roy

 

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