How RTS CTS works in UART?

How RTS CTS works in UART?

With hardware flow control (also called RTS/CTS flow control), two extra wires are needed in addition to the data lines. They are called RTS (Request to Send) and CTS (Clear to Send). These wires are cross-coupled between the two devices, so RTS on one device is connected to CTS on the remote device and vice versa.

What is RTS and CTS in UART?

RTS / CTS Flow Control is another flow control mechanism that is part of the RS232 standard. It makes use of two further pins on the RS232 connector, RTS (Request to Send) and CTS (Clear to Send). These two lines allow the receiver and the transmitter to alert each other to their state.

Is RTS CTS necessary?

Some serial implementations link CTS and RTS to remove the need for handshaking. Laird strongly recommends that developers utilize RTS / CTS for flow control in their applications.

How to setup an UART with RTS and CTS?

I am struggling to configure my UART to do the RTS CTS flow control in hardware and are not sure if my current steps are right. Maybe someone can give me some advice or hint how to solve that problem.

How to enable CTS / RTS in Raspbian?

CTS is available on GPIO16. RTS is available on GPIO17. For UART 0 (I guess ttyS0) you will have to place those GPIO in mode ALT3. For UART 1 you will have to place those GPIO in mode ALT5. See page 102 of BCM2835 ARM Peripherals.

Is it necessary to use RTS and RTS for flow control?

Some serial implementations link CTS and RTS to remove the need for handshaking. Laird strongly recommends that developers utilize RTS / CTS for flow control in their applications. Continue reading for technical scenarios that developers should consider before foregoing the correct use of CTS / RTS.

How to enable HW flow control on Raspberry Pi?

I have to use MAIN UART (PL011) of the Raspberry Pi rather than MINI UART to achieve a higher baud rate (1500000) & more stability (as mini uart has some drawbacks like not able to detect breakdown, no receive timer interrupts etc). Also wants to enable HW Flow Control For UART (PL011).