Unable to use TWI on nrf52840

RE: Unable to use TWI on nrf52840

awneil — Wed, 16 Jan 2019 11:32:16 GMT

[quote userid="74404" url="~/f/nordic-q-a/42454/unable-to-use-twi-on-nrf52840/165853"]im not using a nordic dev kit. Its a custom board[/quote]

It's always good to have Nordic dev kit as a known-good reference ...

This applies in general - not just to Nordic.

RE: Unable to use TWI on nrf52840

AndreasF — Wed, 16 Jan 2019 11:25:17 GMT

Hi.

I've looked at your code with a logic analyzer.

I'm not able to transfer any data with your code, and stepping through the code I can see that the transmit function is called, but it goes into a infinite loop. I think you maybe have some problems with the pin configuration / or that a pin is floating.

There are a lot of working MPU9250 drivers, can you take a look at how they are configured?

Best regards,

Andreas

RE: Unable to use TWI on nrf52840

rgujju — Wed, 16 Jan 2019 03:56:25 GMT

I have posted the debugger output above.

Not really. Just havent gotten to it yet.

No, im not using a nordic dev kit. Its a custom board.

RE: Unable to use TWI on nrf52840

awneil — Tue, 15 Jan 2019 18:08:50 GMT

[quote userid="74404" url="~/f/nordic-q-a/42454/unable-to-use-twi-on-nrf52840"] I dont have a logic analyzer[/quote]

and you don' have a debugger, either?

You really do like to make life hard for yourself!

Do you have a reason not to use SES ?

Are you using a Nordic Dev Kit?

RE: Unable to use TWI on nrf52840

rgujju — Tue, 15 Jan 2019 17:39:33 GMT

I tried by uploading the generated hex file directly and it works. But when i create a zip file using nrfutil for usb-dfu, it shows the "stuck" behaviour i have been describing in this post. Can you please help me out? I am using SDK nRF5_SDK_15.2.0_9412b96 .

I created the zip file using nrfutil pkg generate --debug-mode --hw-version 52 --sd-req 0 --application _build/nrf52840_xxaa.hex trial.zip

and i am using the open_bootloader example.


/* Linker script to configure memory regions. */

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
  FLASH (rx) : ORIGIN = 0x1000, LENGTH = 0xff000
  RAM (rwx) :  ORIGIN = 0x20000000, LENGTH = 0x40000
}

SECTIONS
{
}

SECTIONS
{
  . = ALIGN(4);
  .mem_section_dummy_ram :
  {
  }
  .log_dynamic_data :
  {
    PROVIDE(__start_log_dynamic_data = .);
    KEEP(*(SORT(.log_dynamic_data*)))
    PROVIDE(__stop_log_dynamic_data = .);
  } > RAM
  .log_filter_data :
  {
    PROVIDE(__start_log_filter_data = .);
    KEEP(*(SORT(.log_filter_data*)))
    PROVIDE(__stop_log_filter_data = .);
  } > RAM

} INSERT AFTER .data;

SECTIONS
{
  .mem_section_dummy_rom :
  {
  }
  .log_const_data :
  {
    PROVIDE(__start_log_const_data = .);
    KEEP(*(SORT(.log_const_data*)))
    PROVIDE(__stop_log_const_data = .);
  } > FLASH
  .log_backends :
  {
    PROVIDE(__start_log_backends = .);
    KEEP(*(SORT(.log_backends*)))
    PROVIDE(__stop_log_backends = .);
  } > FLASH
    .nrf_balloc :
  {
    PROVIDE(__start_nrf_balloc = .);
    KEEP(*(.nrf_balloc))
    PROVIDE(__stop_nrf_balloc = .);
  } > FLASH

} INSERT AFTER .text

INCLUDE "nrf_common.ld"

Also are there any resource for linker files in nrf SDK?

Thanks

RE: Unable to use TWI on nrf52840

rgujju — Mon, 14 Jan 2019 18:04:27 GMT

GNU gdb (GNU Tools for Arm Embedded Processors 7-2017-q4-major) 8.0.50.20171128-git
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-pc-linux-gnu --target=arm-none-eabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) target extended-remote /dev/ttyACM0
Remote debugging using /dev/ttyACM0
(gdb) monitor swdp
Target voltage: unknown
Available Targets:
No. Att Driver
 1      Nordic nRF52
 2      Nordic nRF52 Access Port
(gdb) attach 1
Attaching to Remote target
warning: No executable has been specified and target does not support
determining executable automatically.  Try using the "file" command.
0x00003aa8 in ?? ()
(gdb) file _build/nrf52840_xxaa.out
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from _build/nrf52840_xxaa.out...done.
(gdb) break nrf_drv_twi_tx
Breakpoint 1 at 0x5e52: file ../../../../../../integration/nrfx/legacy/nrf_drv_twi.h, line 541.
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/rohit/Documents/wearables/Implementation/nrf52840/code/NRFSDK/nRF5_SDK_15.2.0_9412b96/examples/peripheral/twi_scanner_rohit/pca10056/blank/armgcc/_build/nrf52840_xxaa.out 
Note: automatically using hardware breakpoints for read-only addresses.

Breakpoint 1, nrf_drv_twi_tx (p_instance=0x2003ffa0, address=104 'h', p_data=0x2003ffcc "u", length=1 '\001', no_stop=false)
    at ../../../../../../integration/nrfx/legacy/nrf_drv_twi.h:541
541	    ret_code_t result = 0;
(gdb) step
544	        result = nrfx_twim_tx(&p_instance->u.twim,
(gdb) step
nrfx_twim_tx (p_instance=0x2003ffa4, address=104 'h', p_data=0x2003ffcc "u", length=1, no_stop=false)
    at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:505
505	    nrfx_twim_xfer_desc_t xfer = NRFX_TWIM_XFER_DESC_TX(address, (uint8_t*)p_data, length);
(gdb) step
507	    return nrfx_twim_xfer(p_instance, &xfer, no_stop ? NRFX_TWIM_FLAG_TX_NO_STOP : 0);
(gdb) step
nrfx_twim_xfer (p_instance=0x2003ffa4, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:474
474	    nrfx_err_t err_code = NRFX_SUCCESS;
(gdb) step
475	    twim_control_block_t * p_cb = &m_cb[p_instance->drv_inst_idx];
(gdb) step
492	    err_code = twim_xfer(p_cb, (NRF_TWIM_Type *)p_instance->p_twim, p_xfer_desc, flags);
(gdb) step
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:306
306	    nrfx_err_t err_code = NRFX_SUCCESS;
(gdb) step
307	    nrf_twim_task_t  start_task = NRF_TWIM_TASK_STARTTX;
(gdb) step
308	    nrf_twim_event_t evt_to_wait = NRF_TWIM_EVENT_STOPPED;
(gdb) step
310	    if (!nrfx_is_in_ram(p_xfer_desc->p_primary_buf))
(gdb) step
nrfx_is_in_ram (p_object=0x2003ffcc) at ../../../../../../modules/nrfx/drivers/nrfx_common.h:257
257	    return ((((uint32_t)p_object) & 0xE0000000u) == 0x20000000u);
(gdb) step
258	}
(gdb) step
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:319
319	    nrf_twim_int_disable(p_twim, NRF_TWIM_ALL_INTS_MASK);
(gdb) step
nrf_twim_int_disable (p_reg=0x40003000, int_mask=27001346) at ../../../../../../modules/nrfx/hal/nrf_twim.h:414
414	    p_reg->INTENCLR = int_mask;
(gdb) step
415	}
(gdb) step
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:320
320	    if (p_cb->busy)
(gdb) 
331	        p_cb->busy = ((NRFX_TWIM_FLAG_NO_XFER_EVT_HANDLER & flags) ||
(gdb) 
332	                      (NRFX_TWIM_FLAG_REPEATED_XFER & flags)) ? false: true;
(gdb) 
331	        p_cb->busy = ((NRFX_TWIM_FLAG_NO_XFER_EVT_HANDLER & flags) ||
(gdb) 
335	    p_cb->xfer_desc = *p_xfer_desc;
(gdb) 
336	    p_cb->repeated = (flags & NRFX_TWIM_FLAG_REPEATED_XFER) ? true : false;
(gdb) 
337	    nrf_twim_address_set(p_twim, p_xfer_desc->address);
(gdb) 
nrf_twim_address_set (p_reg=0x40003000, address=104 'h') at ../../../../../../modules/nrfx/hal/nrf_twim.h:460
460	    p_reg->ADDRESS = address;
(gdb) 
461	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:339
339	    nrf_twim_event_clear(p_twim, NRF_TWIM_EVENT_STOPPED);
(gdb) 
nrf_twim_event_clear (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:374
374	    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)) = 0x0UL;
(gdb) 
376	    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event));
(gdb) 
377	    (void)dummy;
(gdb) 
379	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:340
340	    nrf_twim_event_clear(p_twim, NRF_TWIM_EVENT_ERROR);
(gdb) 
nrf_twim_event_clear (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:374
374	    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event)) = 0x0UL;
(gdb) 
376	    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event));
(gdb) 
377	    (void)dummy;
(gdb) 
379	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:342
342	    twim_list_enable_handle(p_twim, flags);
(gdb) 
twim_list_enable_handle (p_twim=0x40003000, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:283
283	    if (NRFX_TWIM_FLAG_TX_POSTINC & flags)
(gdb) 
289	        nrf_twim_tx_list_disable(p_twim);
(gdb) 
nrf_twim_tx_list_disable (p_reg=0x40003000) at ../../../../../../modules/nrfx/hal/nrf_twim.h:502
502	    p_reg->TXD.LIST = 0;
(gdb) 
503	}
(gdb) 
twim_list_enable_handle (p_twim=0x40003000, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:292
292	    if (NRFX_TWIM_FLAG_RX_POSTINC & flags)
(gdb) 
298	        nrf_twim_rx_list_disable(p_twim);
(gdb) 
nrf_twim_rx_list_disable (p_reg=0x40003000) at ../../../../../../modules/nrfx/hal/nrf_twim.h:512
512	    p_reg->RXD.LIST = 0;
(gdb) 
513	}
(gdb) 
twim_list_enable_handle (p_twim=0x40003000, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:300
300	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:343
343	    switch (p_xfer_desc->type)
(gdb) 
387	        nrf_twim_tx_buffer_set(p_twim, p_xfer_desc->p_primary_buf, p_xfer_desc->primary_length);
(gdb) 
nrf_twim_tx_buffer_set (p_reg=0x40003000, p_buffer=0x2003ffcc "u", length=1) at ../../../../../../modules/nrfx/hal/nrf_twim.h:467
467	    p_reg->TXD.PTR    = (uint32_t)p_buffer;
(gdb) 
468	    p_reg->TXD.MAXCNT = length;
(gdb) 
469	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:388
388	        if (NRFX_TWIM_FLAG_TX_NO_STOP & flags)
(gdb) 
397	            nrf_twim_shorts_set(p_twim, NRF_TWIM_SHORT_LASTTX_STOP_MASK);
(gdb) 
nrf_twim_shorts_set (p_reg=0x40003000, shorts_mask=512) at ../../../../../../modules/nrfx/hal/nrf_twim.h:482
482	    p_reg->SHORTS = shorts_mask;
(gdb) 
483	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:398
398	            p_cb->int_mask = NRF_TWIM_INT_STOPPED_MASK | NRF_TWIM_INT_ERROR_MASK;
(gdb) 
400	        nrf_twim_task_trigger(p_twim, NRF_TWIM_TASK_RESUME);
(gdb) 
nrf_twim_task_trigger (p_reg=0x40003000, task=NRF_TWIM_TASK_RESUME) at ../../../../../../modules/nrfx/hal/nrf_twim.h:362
362	    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)task)) = 0x1UL;
(gdb) 
363	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:401
401	        break;
(gdb) 
414	    if (!(flags & NRFX_TWIM_FLAG_HOLD_XFER) && (p_xfer_desc->type != NRFX_TWIM_XFER_TXTX))
(gdb) 
416	        nrf_twim_task_trigger(p_twim, start_task);
(gdb) 
nrf_twim_task_trigger (p_reg=0x40003000, task=NRF_TWIM_TASK_STARTTX) at ../../../../../../modules/nrfx/hal/nrf_twim.h:362
362	    *((volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)task)) = 0x1UL;
(gdb) 
363	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:419
419	    if (p_cb->handler)
(gdb) 
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_ERROR) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:441
441	        while (!nrf_twim_event_check(p_twim, evt_to_wait))
(gdb) 
nrf_twim_event_check (p_reg=0x40003000, event=NRF_TWIM_EVENT_STOPPED) at ../../../../../../modules/nrfx/hal/nrf_twim.h:384
384	    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
(gdb) 
385	}
(gdb) 
twim_xfer (p_cb=0x20000850 <m_cb>, p_twim=0x40003000, p_xfer_desc=0x2003ff54, flags=0) at ../../../../../../modules/nrfx/drivers/src/nrfx_twim.c:443
443	            if (nrf_twim_event_check(p_twim, NRF_TWIM_EVENT_ERROR))
(gdb) quit
A debugging session is active.

	Inferior 1 [Remote target] will be killed.

Quit anyway? (y or n) y

I hope this helps.

RE: Unable to use TWI on nrf52840

rgujju — Mon, 14 Jan 2019 14:48:52 GMT

i dont have segger or keil. i am using gcc.

RE: Unable to use TWI on nrf52840

AndreasF — Mon, 14 Jan 2019 14:21:06 GMT

Hi.

Can you please take a look at the debugging guide for Segger Embedded Studio?

There is also one for Keil here.

Best regards,

Andreas

RE: Unable to use TWI on nrf52840

rgujju — Mon, 14 Jan 2019 14:01:07 GMT

I dont get any error. It just gets stuck.

RE: Unable to use TWI on nrf52840

AndreasF — Mon, 14 Jan 2019 13:39:18 GMT

Hi.

Can you try to debug the project and set a breakpoint on nrf_drv_twi_tx and step throught the code until you get an error code?

Best regards,

Andreas

RE: Unable to use TWI on nrf52840

rgujju — Sun, 13 Jan 2019 13:21:16 GMT

I have tried the using the twi_scanner example. but it seems to get stuck at nrf_drv_twi_rx. I have checked using gdb as well and it is actually getting stuck and not causing a segmentation fault.