pc-ble-driver 115k2

[wkleunen]

I am attempting to build the latest (4.1.1) pc-ble-driver with 115k2 baudrate. I have a hardware platform which supports 115k2 as maximum baud rate. It seems only the 1m version is build now. I am changing the file components/serialization/common/ser_config.h

I update the baudrate:

/** UART transmission parameters */
#define SER_PHY_UART_FLOW_CTRL NRF_UART_HWFC_DISABLED
#define SER_PHY_UART_PARITY NRF_UART_PARITY_EXCLUDED
#define SER_PHY_UART_BAUDRATE_VAL 115200

But it seems the connectivity firmware only works at 1m. Is it still possible to build a 115k2 version ? 

[wkleunen]

For example the following firmware:
https://raw.githubusercontent.com/NordicSemiconductor/pc-ble-driver/release/4.0-compiled-connectivity/hex/sd_api_v5/connectivity_4.0.0_115k2_with_s132_5.1.0.hex

Can not be opened at 115200 using the heart rate collector example:
https://github.com/NordicSemiconductor/pc-ble-driver/blob/master/examples/heart_rate_collector/main.c

[Amanda Hsieh]

wkleunen said:

Can not be opened at 115200 using the heart rate collector example:

 Did you modify the #define DEFAULT_BAUD_RATE at https://github.com/NordicSemiconductor/pc-ble-driver/blob/master/examples/heart_rate_collector/main.c#L67?

-Amanda H.

[wkleunen]

PCA10040 v1.1.1 2017.1 is the version. I connect through the USB cable. How should I check the hardware flow control ?

[Amanda Hsieh]

(Updated)

Did you change the HWFC settings in connectivity FW or the pc-ble-driver application?

--

Please see nRF52 Development Kit dynamic hardware flow control (HWFC) handling and Connecting via CDC-UART. 

-Amanda H.

[Amanda Hsieh]

Hi, 

wkleunen said:

How should I check the hardware flow control ?

According to https://github.com/NordicSemiconductor/pc-ble-driver/blob/c4ad9a668d9826a03f687a0b0a2a8c2390d4c45b/examples/heart_rate_collector/main.c#L228

By default, connectivity is compiled without flow control.

-Amanda H.

[wkleunen]

I tried with and without hardware flow control, still the application does not connect to the board at 115k2. 

[Amanda Hsieh]

Hi, 

I have reported it to the internal. However, we need more time to investigate it. I will be back if I have anything to update.  

-Amanda H.

[Amanda Hsieh]

Hi Wouter, 

Sorry for the long delay with this. Is this still relevant?

I got the following from the engineer:

There's not so much we can do about this other than giving hints on where to look.

They will need hardware flow control activated in the firmware if they are using a nordic kit with a segger chip. When they connect from pc it should be with hardware flow control set to none (because of how the particular virtual com port client operates).

They might try to increase timeout values in ble-driver transport.

-Amanda H.