Nrf51822 Uart baudrate

[angelforest]

Hi there,

I have a issue with the nrf51822 UART baudrate setting.

I am developing nrf51822 dongle, its job is to transfer data between PC and a BLE periph. For a stable transfer, the baudrate has to decrease to 38400.

I want to increase the baudrate to 115200, but it easy to induce APP_UART_COMMUNICATION_ERROR(overrun) when transferring mass of data to BLE slave over the air.

It works stable at 115200 baudrate when not transfer the packets to BLE slave, I checked this by printing out the uart received data through Segger RTT. So, it seems the UART interrupt is blocked by BLE events. I increase UART priority from 3 to 1, but didn't work.

How can I improve the UART baudrate to 115200, add CTS, RTS? Is there any method to increase the baudrate without adding uart flow control?

Thanks in advance.

[Turbo J]

Flow control signals seem to be your best bet here.

[Kenneth]

Hardware flow control is likely the easiest to implement, alternatively you may add some software flow control, where for instance the PC request to send 20bytes, and then only after receiving a OK message from the nRF51822, it will send the next 20bytes and so on.