topic Non blocking UART in Kinetis Microcontrollers

Non blocking UART

oaf — Fri, 05 Dec 2014 12:51:15 GMT

Hi,

In the raw MQX examples there is example of non blocking uart input:

uint32_t ser_opts = IO_SERIAL_NON_BLOCKING;

	retval = ioctl(ser_device, IO_IOCTL_SERIAL_SET_FLAGS, &ser_opts);
	if (retval != MQX_OK)
	{
	fputs("TXtask Fatal Error: Unable to setup non-blocking mode.", stderr);

Unfortunately I could not find the IO_SERIAL_NON_BLOCKING defined inside my project or the KSDK,

is the non-blockin mode removed, or is the interface just changed?

(I just want to check if a char is available from the UART, and if not just keep on with what I was doing....)

Carlos_Musich — Wed, 10 Dec 2014 18:48:10 GMT

Hi Ole,

Drivers is classic MQX and MQX for KSDK are completeley different.

In MQX for KSDK you need to check for RDRF flash in UARTx Statusx Register. This flag is defined in KSDK as kUartIntRxDataRegFull.

Hope this helps.

Carlos

oaf — Fri, 16 Jan 2015 14:56:12 GMT

I don't really understand what you mean. My UART is IRQ driven, could you please tell me which API I should use to

figure out if there is a char waiting in the input quee?