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CTS and RTS auto flow using CMSIS platform

Hello everyone,

I'm using LPC 1837 controller with CMSIS platform. UART1 is interface with bluetooth module along with DMA enable. UART1 pins used are Rx, Tx, CTS and RTS. CMSIS UART driver is used with the following configuration.

UART_Drv-> Control( ARM_USART_MODE_ASYNCHRONOUS| ARM_USART_DATA_BITS_8| ARM_USART_PARITY_NONE| ARM_USART_STOP_BITS_1| ARM_USART_FLOW_CONTROL_RTS_CTS, 921600U);

i'm able to receive data from UART, but not enable to send the data from UART.

may i know the reasons for this issue and how to solution for this.

or

get the example code to know how to use RTS and CTS using CMSIS platform.