(nRF51822) uart rx loss data after start advertising

RE: (nRF51822) uart rx loss data after start advertising

nivo — Mon, 18 Jan 2016 08:36:44 GMT

OK，I will try it

RE: (nRF51822) uart rx loss data after start advertising

RK — Mon, 18 Jan 2016 08:33:57 GMT

That's a strange combination of stuff. What actual revision of the device are you running on? If you are on revision 2, the latest is SDK 6.1 with softdevice 7.1, no need to be using an old beta softdevice. If you have a revision 3 chip however you can use softdevice revision 8 with one of the more recent SDKs, like SDK 8.1 or newer. That will reduce the amount of time the softdevice uses a bit. However .. without HWFC or a much slower baud rate, if you start really doing a lot of BTLE transmissions, you're going to start losing UART data.

RE: (nRF51822) uart rx loss data after start advertising

nivo — Mon, 18 Jan 2016 08:21:44 GMT

i use sdk is nrf51_sdk_v5_1_0_36092 soft device is s110_nrf51822_6.0.0-5.beta_softdevice

RE: (nRF51822) uart rx loss data after start advertising

nivo — Mon, 18 Jan 2016 08:18:42 GMT

hi,Aryan! I set the hwfc is flase ,but loss data . I test tx data is ok.
I use pc UART transimit the data to BLE(20ms , 20bits ), and transmit the data back. the data is loss

RE: (nRF51822) uart rx loss data after start advertising

RK — Mon, 18 Jan 2016 08:16:21 GMT

You're going to have problems running at 38,400 baud with the softdevice enabled and no hardware flow control. That's your problem. Use a slower baud rate, enable HWFC and it will help to use the latest revision nrf51 and latest softdevices (as they interrupt the CPU less). What SDK/softdevice and nrf51 are you actually using .. just for reference.

RE: (nRF51822) uart rx loss data after start advertising

nivo — Mon, 18 Jan 2016 08:11:34 GMT

hi ,RK! i set the hwfc is false ,and loss data NRF_UART0->CONFIG = (UART_CONFIG_HWFC_Disabled << UART_CONFIG_HWFC_Pos);

RE: (nRF51822) uart rx loss data after start advertising

nivo — Mon, 18 Jan 2016 08:05:18 GMT

i have another ble module （QN9021），doesn't loss data. Idon't use hardware flow control.

RE: (nRF51822) uart rx loss data after start advertising

Susheel Nuguru — Mon, 18 Jan 2016 07:54:20 GMT

True RK, I assumed that it is being called, nivo confused me by adding that snippet here :) OK, no more assumptions

RE: (nRF51822) uart rx loss data after start advertising

RK — Mon, 18 Jan 2016 07:12:22 GMT

how can you tell, you can't see the call to simple_uart_config() to know whether the hwfc parameter is set true or false?

RE: (nRF51822) uart rx loss data after start advertising

Susheel Nuguru — Mon, 18 Jan 2016 07:05:28 GMT

from the code it looks like flow control is enabled. Can you please let us which data is missing and the sequence of transmission, possibly some timings.

RE: (nRF51822) uart rx loss data after start advertising

RK — Mon, 18 Jan 2016 06:52:58 GMT

The softdevice disturbs the timing of everything - are you using hardware flow control or not, if not, that's probably the problem.