Separate BLE Tx from SPI/I2C operation

RE: Separate BLE Tx from SPI/I2C operation

djqtsg — Tue, 18 Apr 2017 10:12:11 GMT

A more safer way is to enable inactive notification only. When SW1_IRQHandler() is called, we are certain that radio is inactive; then I can make SPI calls.

I set radio active flag to true after calling ble_nus_string_send().

However, it didn't help resolve ADC outlier problem, not even reduce. Maybe I need to look for something else.

Thx anyway.

RE: Separate BLE Tx from SPI/I2C operation

FormerMember — Tue, 18 Apr 2017 08:55:45 GMT

I can agree that it may seem a little fragile. To make sure that it works properly, the initialization of the radio notifications should be done right after the initialization of the softdevice: (sd_radio_notification_cfg_set documentation) *To ensure that the radio notification signal behaves in a consistent way, the radio

   notifications must be configured when there is no protocol stack or other SoftDevice

   activity in progress. It is recommended that the radio notification signal is

   configured directly after the SoftDevice has been enabled.*

Another, perhaps more complex option is to use the timeslot API.

RE: Separate BLE Tx from SPI/I2C operation

djqtsg — Mon, 10 Apr 2017 06:32:10 GMT

I thought to do similar thing.

However, how can I make sure I would not miss SWI1_IRQHandler()? One missing call will mess up the state machine.

RE: Separate BLE Tx from SPI/I2C operation

FormerMember — Fri, 07 Apr 2017 11:03:50 GMT

I'm not sure if the radio notification signal indicates active/nactive or indicates that there is a radio notification. But you know for sure that the first radio notification is "active". I would therefore recommend you to just have a local statemachine (state variable) keeping the state of the radio notification.

RE: Separate BLE Tx from SPI/I2C operation

djqtsg — Fri, 07 Apr 2017 07:26:47 GMT

I found this tutorial devzone.nordicsemi.com/.../

It is not clear to me how to link radio active event to SWI1_IRQn.

What if I want to be notified by both active and inactive event.

radio_evt in SWI1_IRQHandler() is a bool variable: does true mean radio active, false mean inactive?

RE: Separate BLE Tx from SPI/I2C operation

FormerMember — Tue, 04 Apr 2017 09:13:01 GMT

To avoid to reading sensor data when the radio is active, you can use radio notifications to notify the application when the radio is active and not active.

If your device is in a connection, and it only sends one packet per connection interval, the radio will be turned off for quite some time for each connection interval.