I started analyzing my application using SystemView to try to resolve a bug. I think I have configured everything correctly. However, when I start the analysis, I notice that an ISR is being called periodically every 61 microseconds, significantly occupying the CPU. Initially, I thought it was the Zephyr RTOS tick, but since it occurs every 120 microseconds, I ruled out that possibility. Could it be related to the BLE stack?
- How can I determine which ISR it is? Is it possible to assign names to ISRs when tracing?
- Why don't I see the Zephyr RTOS tick ISR?
Am I perhaps acquiring the data incorrectly?
UPDATE: I also noticed that if I enable tracing
CONFIG_TRACING=y CONFIG_SEGGER_SYSTEMVIEW=y
the function bt_scan_start() in my application returns the error -EAGAIN due to the BT_DEV_READY flag never being set. Even if I put a loop to wait for it to be set
while ( bt_is_ready() == false )
{
k_sleep( K_MSEC( 100 ) );
}
ret = bt_scan_start( BT_SCAN_TYPE_SCAN_ACTIVE );
if ( ret != 0 )
{
LOG_WRN( "bt_scan_start (err %d)", ret );
return SYSTEM_ERROR;
}
I never exit the loop. By running some tests, I discovered that it's as if BLE is never activated. In the BLE initialization, I have:
void Ble_Connection_Ready( int err )
{
if ( err )
{
return;
}
k_sem_give( &bluetoothReady );
}
[...]
if ( bt_enable( Ble_Connection_Ready ) != 0 )
{
return SYSTEM_ERROR;
}
if ( k_sem_take( &bluetoothReady, K_SECONDS( 10 ) ) != 0 )
{
return SYSTEM_ERROR;
}
And the k_sem_take() always fails because BLE is never enabled cause the Ble_Connection_Ready( int err ) returns error -105 (ENOBUFS). However, if I disable tracing, everything works as expected. Below is my prj.conf.
################################################ ### SYSTEM CONFIGURATION ####################### ################################################ CONFIG_LOG=y CONFIG_LOG_MAX_LEVEL=2 CONFIG_USE_SEGGER_RTT=y CONFIG_RTT_CONSOLE=y CONFIG_HEAP_MEM_POOL_SIZE=2048 CONFIG_FPU=y CONFIG_RING_BUFFER=y CONFIG_ZCBOR=y CONFIG_ZCBOR_STOP_ON_ERROR=y # CONFIG_DISABLE_FLASH_PATCH=y CONFIG_EVENTS=y CONFIG_KERNEL_BIN_NAME="cruise_dongle" CONFIG_TRACING=y CONFIG_SEGGER_SYSTEMVIEW=y ################################################ ### SOC'S PERIPHERALS CONFIGURATION ############ ################################################ CONFIG_GPIO=y CONFIG_PWM=y CONFIG_LED=y CONFIG_SERIAL=y CONFIG_UART_ASYNC_API=y CONFIG_UART_0_NRF_HW_ASYNC=y CONFIG_UART_0_NRF_HW_ASYNC_TIMER=1 ################################################ ### BLE CONFIGURATION ########################## ################################################ CONFIG_BT_MAX_CONN=8 CONFIG_BT=y CONFIG_BT_CENTRAL=y CONFIG_BT_SMP=y CONFIG_BT_DFU_SMP=y CONFIG_BT_GATT_CLIENT=y CONFIG_BT_SCAN=y CONFIG_BT_SCAN_FILTER_ENABLE=y CONFIG_BT_SCAN_CONN_ATTEMPTS_FILTER=y CONFIG_BT_SCAN_CONN_ATTEMPTS_FILTER_LEN=6 CONFIG_BT_SCAN_CONN_ATTEMPTS_COUNT=2 CONFIG_BT_SCAN_UUID_CNT=3 CONFIG_BT_GATT_DM=y CONFIG_BT_BUF_ACL_RX_SIZE=502 CONFIG_BT_ATT_PREPARE_COUNT=2 # CONFIG_BT_L2CAP_TX_BUF_COUNT=10 CONFIG_BT_L2CAP_TX_MTU=498 # CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y CONFIG_BT_CONN_TX_MAX=10 CONFIG_BT_BUF_ACL_TX_COUNT=10 CONFIG_BT_BUF_ACL_TX_SIZE=502 CONFIG_BT_CTLR_DATA_LENGTH_MAX=251 CONFIG_BT_CTLR_PHY_2M=y CONFIG_BT_CTLR_RX_BUFFERS=2 CONFIG_BT_CTLR_SDC_MAX_CONN_EVENT_LEN_DEFAULT=4000000 CONFIG_BT_USER_DATA_LEN_UPDATE=y CONFIG_BT_USER_PHY_UPDATE=y ################################################ ### NVS MEMORY CONFIGURATION ################### ################################################ CONFIG_NVS=y ################################################ ### FLASH MEMORY SUPPORT CONFIGURATION ######### ################################################ CONFIG_FLASH=y CONFIG_MPU_ALLOW_FLASH_WRITE=y CONFIG_FLASH_PAGE_LAYOUT=y
