Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

jswcomkr — Mon, 04 May 2020 15:17:18 GMT

I apologize for insufficient answer. I dont have I2C/SPI protocol analyzer. I used 1kOhms as pullup. I use P0.11 P.012 as TWI lines. I will review datasheets once again.

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

awneil — Mon, 04 May 2020 15:03:11 GMT

for the 3rd time of asking:

[quote userid="6462" url="~/f/nordic-q-a/60971/problems-with-twi-when-using-bluetooth-le-simultaneously-taking-wrong-data-from-twi-when-enable-ble/247783"]Have you got an I2C analyser to see what's actually happening on the bus?[/quote]

or even just a scope to see if there's anything grossly wrong?

what pullups are you using?

have you seen that some of the pins have warning not to be used for "high speed" IO when the radio's running...?

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

jswcomkr — Mon, 04 May 2020 14:59:00 GMT

But the other data not comes from TWI is fine such as RTC or Timer/Counter. Only TWI is not working.

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

jswcomkr — Mon, 04 May 2020 14:57:02 GMT

I was gather that data through the UART. If disable Bluetooth LE, there are no problems. Arduino codes was made by me for convinience. The first codes are Arduino-like(just like Wire library of Arduino). Purpose of this codes are gathering IMU data through Bluetooth LE UART services.

I guess that this problem caused from priority. is it right?

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

awneil — Mon, 04 May 2020 13:50:30 GMT

So you're sending data our of the nRF over a UART ?

Are you sure it's not the UART part that's going wrong ... ?

Again:

[quote userid="6462" url="~/f/nordic-q-a/60971/problems-with-twi-when-using-bluetooth-le-simultaneously-taking-wrong-data-from-twi-when-enable-ble/247783"]Have you got an I2C analyser to see what's actually happening on the bus[/quote]

This looks like Arduino code.

Note that Nordic has nothing to do with the Arduino implementation.

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

jswcomkr — Mon, 04 May 2020 13:32:29 GMT

I've added CP2104 USB to UART bridge chipset for communication. I got the data from this IC and saved it as CSV format using 'Serial Plot' application on the Windows. After that, plot the data using MATLAB.

RE: Problems with TWI when using Bluetooth LE simultaneously (taking wrong data from TWI when enable BLE)

awneil — Mon, 04 May 2020 08:21:18 GMT

How are you making those graphs?

Have you got an I2C analyser to see what's actually happening on the bus?