BLE softdevice clock running slower

RE: BLE softdevice clock running slower

siri sam — Thu, 28 Jun 2018 12:02:51 GMT

Hello,

I've managed to solve my problem. It was a conflict within the differents timers used. However, I still cannot emit with the radio but it might be a subject for another ticket.

Thank you.

RE: BLE softdevice clock running slower

siri sam — Tue, 26 Jun 2018 06:52:45 GMT

It might be a good lead for me as I'm using interrupt for most of my peripherals (UART, I2C, SPI) and a timer.

Thank you.

RE: BLE softdevice clock running slower

siri sam — Tue, 26 Jun 2018 06:44:32 GMT

On my board, I use the same XTAL and the same capacitors as on the DevBoard PCA10056.

I'll try to use the RC Oscillator.

Best Regards.

RE: BLE softdevice clock running slower

Edvin — Mon, 04 Jun 2018 10:33:46 GMT

Whenever all the peripheral examples work fine, but the BLE examples doesn't work on a custom board, it is usually LFXTAL issues. What XTAL are you using, and what are the values of the capacitors connected to it?

If you want to check whether this is actually, you may try to use the RC Oscillator to bypass the LFXTAL.

But I assume that you want to use the XTAL, since it is there, and it is more power efficient to use it. So what is your XTAL spec, and what are the capacitors (the ones in figure 2 on this page)

Best regards,

Edvin

RE: BLE softdevice clock running slower

AmbystomaLabs — Fri, 01 Jun 2018 21:21:12 GMT

As pointed out by the nordic person, you can't break the chip with bad code.

Generally with the SD most people fail to realize that they can't service ISR's immediately and that anything they do is done after the SD is finished with the processor.

So millisecond interrupts are a bad idea as is more than 100 or so intterrupts a second. Your code should make maximum use of the hardware at your disposal (eg, DMA) and not a lot of software to handle data.

RE: BLE softdevice clock running slower

siri sam — Fri, 01 Jun 2018 15:09:38 GMT

Hello Edvin,

I've tried other ble exemple from the SDK and they don't work either.

In my software, I have peripherals such as USB, TWI,SPI UART and timer and they work great when the softdevice isn't added. I do have an LFXTAL on my board.

Regards,

Sirisack

RE: BLE softdevice clock running slower

Edvin — Thu, 31 May 2018 14:12:39 GMT

Hello.

I don't think adding the softdevice to the firmware can damage the clocks on the chip.

Is it only the examples that are using the softdevice that aren't working?

Are the other examples, such as the ones found in SDK\examples\peripheral working properly?

Do you have a LFXTAL on your custom board? Or do you use the RC Oscillator?

Best regards,

Edvin