ncs v2.9.0
nRF52832 DK (NUS central)
nRF52840 DK (NUS peripheral)
1) When connected, see the empty PDU from peripheral to central about 100ms interval.
2) To use the power monitor to watch the current consumption, the current pulse is about 50ms interval, why it's different?
I send "Hello\n" 6 bytes from peripheral to central to test peripheral TX current consumption, and I see many pulses more than 6 in the power monitor. It continued about 420ms, how to explain it and how to improve it?
I expect to see the current like the "Online Power Profiler for Bluetooth LE".
The following is the power monitor screen captured,
zoom in
1) connection interval is unmodified, the default values are
#define BT_GAP_INIT_CONN_INT_MIN 0x0018 /* 30 ms */
#define BT_GAP_INIT_CONN_INT_MAX 0x0028 /* 50 ms */
I think maybe the sniffer can't capture all packets for channel hopping condition, so the interval changed to 100ms in the wireshark.
I got empty PDU packets interval 50ms sometimes in the wireshark.
2) To send "hello\n" once waveform as the following, the sampling rate is 32k/s, maybe not the real waveform.
zoom in
zoom in
It seems have 6 spikes matching the 6 bytes data, but why it continued many times in 10ms interval?
1) connection interval is unmodified, the default values are
#define BT_GAP_INIT_CONN_INT_MIN 0x0018 /* 30 ms */
#define BT_GAP_INIT_CONN_INT_MAX 0x0028 /* 50 ms */
I think maybe the sniffer can't capture all packets for channel hopping condition, so the interval changed to 100ms in the wireshark.
I got empty PDU packets interval 50ms sometimes in the wireshark.
2) To send "hello\n" once waveform as the following, the sampling rate is 32k/s, maybe not the real waveform.
zoom in
zoom in
It seems have 6 spikes matching the 6 bytes data, but why it continued many times in 10ms interval?
Hi,
I used button to trigger send the packet before, and today I change to use timer interval to send packet when timer is expired and the current pulse happened just once. It seems normal now. But the power consumption is large than the "Online Power Profiler for Bluetooth LE" about 30uA.
Hi,
1) Yes, using the latter peripheral_uart sample to send packet to central_uart, the current consumption is higher than online power profiler. I disable the UART in prj.conf and use timer expire to send packet from peripheral to central.
2) I send 13 bytes from nRF52840 dongle (peripheral_uart) to nRF52832 DK (central_uart), and change connection interval to 100ms, so the measured current consumption is about 102 µA, and the online power profiler is about 79 µA as the following.
3) I have read the following data.
