Fatal Error

[DARSHBT]

In my project i usinf nrf52840 and nrf sdk Version is 16.0.0.

two UART port using in project using nrf_serial lib. 

on serial0 port i have connected GSM and on serial1 port i have connected one sensor.

on twi i have connected EEPROM.

i am using app_timer for timer interrupt to wake up from sleep.

now my application is take sensor data from serial1 and store some details in EEPROM and then send using GSM.

Once data is send i make device into sleep mode using idle_state_handle(); function. and Device will wake when app_timer interrupt will generate.

When i load a code into HW 1st time it's work correct but after sleep when its wake up it gives fatal error.

While device go into sleep it turn off GSM,EEPROM and uninit the serial0 and serial1.

and when device wake 1st its turn on GSM then EEPROM. and Then Init serial0.

So, please help me out to solve these issue.

[awneil]

DARSHBT said:

after sleep when its wake up it gives fatal error

So what debugging have you done to find where, exactly, this is happening and what error, exactly, is occurring?

https://infocenter.nordicsemi.com/topic/ug_gsg_ses/UG/gsg/debug.html

https://infocenter.nordicsemi.com/topic/ug_gsg_keil/UG/gsg/debug_keil.html

[DARSHBT]

Thank you so much for your reply.

sorry for late response.

i have debug the code its stuck some times in twi_init() function after following line.

err_code = nrf_drv_twi_init(&m_twi, &twi_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);

and if it some time come out from these function then it stuck in HardFault_Handler();

[awneil]

So what err_code are you getting?

have you looked-up the meaning of that code?

Have you stepped into nrf_drv_twi_init() to see what is causing that error code?

[DARSHBT]

I am getting err_code : 8 as show in figure. 

as show in figure 1st time its give me err_code: 0 

and after sleep, when it weak up it give me err_code :8. 

what is the meaning of err_code 8?

[awneil]

The documentation for nrf_drv_twi_init() will list its possible return codes - you can find the numeric values in the source code.

Again, have you stepped into nrf_drv_twi_init() to see what is causing that error code?

[DARSHBT]

I have Stepped into nrf_drv_twi_init(),

when  nrfx_twim_init() function is call, in that,

below mentioned if condition is check and then control direct go to last line of these function and then,

app_error_fault_handler() function call.

if (p_cb->state != NRFX_DRV_STATE_UNINITIALIZED)
{
err_code = NRFX_ERROR_INVALID_STATE;
NRFX_LOG_WARNING("Function: %s, error code: %s.",
__func__,
NRFX_LOG_ERROR_STRING_GET(err_code));
return err_code;
} 

[DARSHBT]

err_code = 8 means , NRFX_ERROR_INVALID_STATE. could you suggest me the possible reasons of these kind of error generation.

[awneil]

The clue is in the name: INVALID STATE

The code you posted shows what state it should be in.

[DARSHBT]

Thank you so much for your kind support.

I have solve the issue.

issue is of TWI is not properly initialize every time.i have solve these just putting 100 ms delay. 

[awneil]

Thanks for feeding back