Multilink central example stuck at SOFTDEVICE_HANDLER_INIT

Question

I'm trying the multilink central example with s120 and SDK 7.2 (because of simple_uart).
However, my PCA10028 board gets stuck at this macro: 
 SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_8000MS_CALIBRATION, false); 
 How can I solve this? (I'm using Keil 5) 
 The main is the only file I've altered
 main.c

Susheel Nuguru · Accepted Answer

Hi Olivier, 
 It seems like the softdevice thinks that UART0 is a protected block and sd_softdevice_enable fails with an error when it sees that you have enabled UART0 interrupts. 
 there is a check for this error in softdevice_handler.h 
 #define SOFTDEVICE_HANDLER_INIT(CLOCK_SOURCE, \
 EVT_HANDLER) \
 do \
 { \
 static uint32_t BLE_EVT_BUFFER[CEIL_DIV(BLE_STACK_EVT_MSG_BUF_SIZE, sizeof(uint32_t))]; \
 uint32_t ERR_CODE; \
 ERR_CODE = softdevice_handler_init((CLOCK_SOURCE), \
 BLE_EVT_BUFFER, \
 sizeof(BLE_EVT_BUFFER), \
 EVT_HANDLER); \
 APP_ERROR_CHECK(ERR_CODE); \
 } while (0)
 
 APP_ERROR_CHECK defaults to a NVIC_SystemReset() if you have not handled errors yourself in app_error_handler. 
 your code checks APP_ERROR_CHECK
you can fix your problem by moving the uart configuration after the softdevice init 
 // Initialization of various modules.
LEDS_CONFIGURE(LEDS_MASK);
LEDS_OFF(LEDS_MASK);
buttons_init();
ble_stack_init();
simple_uart_config(RTS_PIN_NUMBER, TX_PIN_NUMBER, CTS_PIN_NUMBER, RX_PIN_NUMBER, HWFC);
client_handling_init();
device_manager_init();
 LEDS_ON(LEDS_MASK);
 
 I will dig more into it to find out if this is a bug in softdevice or the documentation regarding UART0 being open to use by applications or not when we use softdevice.