BTLE_CONNECTION_TIMEOUT when not in debug mode

[Alvin]

Hi All,

I'm having a BTLE_CONNECTION_TIMEOUT when I connect the device in Master Control Panel 3.10.0.14 while the chip is not in debug mode.

The device connects without problem in debug mode when I connect my custom board with the nRF52 DK via debug out(P19).

I'm using S130 2.0.1 as a peripheral.

The firmware does not crashes even the Bluetooth time out.

Can any one provide any hints to the problem?

Here is my connection parameters, the slave latency was 0:

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)
#define SLAVE_LATENCY                   4
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)

Here is the log from Master Control Panel:

[11:07:19.0] GetDeviceInfo()
[11:07:19.2] ----------------------------
[11:07:19.2] Connected to device
[11:07:19.2] Role: 0
[11:07:19.2] PeerAddressType: 1
[11:07:19.2] PeerAddress (MSB): CA418CB05838
[11:07:19.2] Connection Interval: 20.0ms
[11:07:19.2] Connection Latency: 0
[11:07:19.2] Supervision Timeout: 3000ms
[11:07:19.2] Clock Accuracy: (1)
[11:07:19.2] ----------------------------
[11:07:19.2] Connected to address: CA418CB05838
[11:07:19.2] Starting a Read Information Request on the whole remote DB
[11:07:19.2] SERVER: Received packet <HciEvent: eventCode=0x05> - <HciEvent: eventCode=0x05>
[11:07:22.2] Lost connection to device. Reason: BTLE_CONNECTION_TIMEOUT
[11:07:22.3] SERVER: Received packet <HciEvent: eventCode=0x0A> - <HciEvent: eventCode=0x0A>
[11:07:22.3] SERVER: Received Link Loss
[11:07:22.3] Discovering all attribute UUIDs
[11:07:22.3] Lost connection before service discovery was complete

[Alvin]

OK. It turns out it's a power issue solved by adding a 10uF tan cap after the LDO which the chip is powered from.

The supply voltage is stable when the JTAG cable is connected possibly it's supplying power to the chip through the cable.