A strange phenomenon on using BLE_UART Example code

[Lee]

Dear Sir:

 I have met a strange problem when using ble_uart example code on SDK 10

1. SDK Version is SDK 10

2. Chipset is Nrf51802

3. the board with no external 32.768KHZ ,usiing the internal LRC 

4. when i building the ble_uart and program into our own board.

the code working normallly.

When i change the Rx PIN and TX PIN as following:

#define RX_PIN_NUMBER 27
#define TX_PIN_NUMBER 26
#define CTS_PIN_NUMBER 0xFF
#define RTS_PIN_NUMBER 0xFF
#define HWFC false

then ble stack can not working normal ?

Why ?

[awneil]

Lee said:

ble stack can not working normal

Please be more specific.

What, exactly, is "not working normal" ?

What debugging have you done to see what's happening?

[Lee]

code will stop here (ble_stack_init();

and the external crystal 16MHZ is not working .

And I have cancel the NRF_LOG_USES_UART

Very strange is sometime is working ,sometime is not working.

The system will be down at ble_stack_init().

[awneil]

Have you checked the Product Specification - are those pins also used by something else?

Do you have a low-frequency crystal?

How to properly post source code:

[Lee]

Dear Sir:
 I am using the example demo. BLE_UART 

The board has no 32.768KHZ crystal ,i havbe used the interlnal LRC

I have mentioned at the first.

The UART PIN is RX 27,and tx is using 26.

i have searched the code ,there is no other occur the pin.

I have not modified the BLE_UART example code ,except modify the low crystal using internal LRC and the uart PIN.