topic Re: Using break condition on serial port in MQX in MQX Software Solutions

Using break condition on serial port in MQX

sudhanshumehta — Thu, 22 Jul 2021 18:32:32 GMT

Hello Everyone,

RTOS used: 4.2

IDE kinetics Design studio

Microcontroller K22

Question: I want to start/set break condition at serial port and then after some time I want to stop break condition at serial port.

I see IO_IOCTL_SERIAL_START_BREAK option but it is not used in BSP.

Any suggestion how can i use this for example UART 1

Thanks

Sudhanshu

danielchen — Thu, 29 Jul 2021 07:36:54 GMT

For the send break, I would suggest you modify mqx/source/io/serial/polled/serl_pol_kuart.c

ioctl turns SBK on using sci_ptr->C2 |= UART_C2_SBK_MASK;

ioctl turns SDB off using sci_ptr->C2 &= ~UART_C2_SBK_MASK;

Regards

Daniel

sudhanshumehta — Thu, 29 Jul 2021 13:44:50 GMT

This worked for me Thanks Daniel.

ioctl(YourFDname_FD, IO_IOCTL_SERIAL_START_BREAK, 1);

ioctl(YourFDname_FD, IO_IOCTL_SERIAL_STOP_BREAK, 1);

You can type cast last parameter

Added following 2 case statements.

case IO_IOCTL_SERIAL_START_BREAK:
sci_ptr->C2 |= UART_C2_SBK_MASK;
break;

case IO_IOCTL_SERIAL_STOP_BREAK:
sci_ptr->C2 &= ~UART_C2_SBK_MASK;
break;