RS-485 Comunication

[Himansu Donga]

Hi,

I am using device as ble-Peripheral SDK nRF51_SDK_7.2.0_cf547b5 and softdevice version :s110_nrf51822_7.1.0_softdevice.

As ble-central SDK nRF51_SDK_7.2.0_cf547b5 and softdevice version :s120_nrf51822_1.0.1_softdevice

my application(one PC to second PC Data link using UART)(RS-485 to BLE Convter) :

PC1(com port)->RS-485->Nordic UART(Without RTS/CTS)->ble-peripheral transmit data => ble-central receive data -> Nordic UART ->RS-485->PC2(Com port)

I am sending data this way this time facing CPU blocking issue. Nordic CPU not available for UART data receive. so that we are lose byte on UART.

how resolve CPU blocking issue.

pls provide solution for that.

This issue face where RTC/CTS control not available in RS485. How resolve this issue for RS-485 communication.if I am used RTC/CTS in UART that time working OK.

Regards,

Himansu Donga

[Asbjørn]

With the 3 revision of the nRF51 you are able to switch off the CPU lock that was put there by the softdevice. That should enable you to get more data through and be able to read it. What baud rate are you using? At which baud rate does this problem occur for you?

[Himansu Donga]

Thanks,

I am using Rev 2 ic and baud rate max 115200.

And I send 100 byte peer to peer is not complete within second.

I send 20 byte every BLE_EVT_TX_COMPLETE event at peripheral side and central side BLE_GATTC_EVT_WRITE_RSP.

Regards, Himansu Donga

[Asbjørn]

Then I would recommend you to try the new nRF51-DK with the revision 3 of the nRF51 on it. This should allow your application to receive more data as the application latency due to softdevice is reduced significantly.