CY7C65215-UART RTS/CTS flow control

[JeffW]

Hi, Infineon:

Our board has a CY7C65215-32LTXI connected to BCM47768 through UART (GPIO pins 3,4,5,8)

The board is connected to a Linux host through USB as

Linux host <--(USB)--> CY7C65215-32LTXI<-- (4 pin UART)--> BCM47768.

We need to use UART RTS/CTS HW flow control. 
Shall we use cdc_acm driver or libcyusbserial UART APIs?

To use libcyusbserial UART APIs, we need config CY7C65215 SCB0 

as Mode: UART, Protocol:Vendor, right?

Thank you

Jeffrey Wang

[Meghavi]

Hi Jeffrey,

Kindly refer to this thread: https://community.infineon.com/t5/USB-superspeed-peripherals/working-with-CY7C65215-on-linux-at-3M-b...

Regards,

Meghavi

[JeffW]

Hi, Meghavi:

I'm using libusbserial in Linux now. There is an issue if I enable HW flow control 

as CyUartSetHwFlowControl(uart_handle, CY_UART_FLOW_CONTROL_RTS_CTS);

CyUartRead() will return CY_ERROR_IO_TIMEOUT.

Without enabling HW flow control, CyUartRead() works. But I need HW flow control to communicate to my MCU.

From the data sheet, data flow control is enabled by default and RTS# signal is de-asserted when receive bufer reach 93% watermark, do I need call CyUartSetHwFlowControl() and CyUartSetRts() and CyUartClearRts()?
By default, CyUartGetHwFlowControl() returns CY_UART_FLOW_CONTROL_DISABLE, this seems contradict with the data sheet.
Do you have UART sample code with RTS/CTS?
There is uart.cpp sample in your SDK, it shows how to call these APIs, but not a working sample show how RTS/CTS is working.

[MallikaK_22 · Accepted solution]

Hi,

Apologies for the delay in the response.

Please check cyuart.c in the Linux SDK present inside the Linux folder in the USB Serial SDK: CyUSBSerial_SDK_Linux.zip\CyUSBSerial_SDK_Linux\CyUSBSerial_SDK_Linux\linux\library 

Regards,

Mallika