Buttonless DFU using BLE

[Roh_Sys]

Hello,

I have application that is sending data over BLE every 5 minutes.

I want to implement DFU using BLE. I don't have any single button on my device.

What should i have to add in my application for DFU. I use native nRF boot-loader from example. What are the changes i have to do in native Bootloader for buttonless DFU.

How to tell my application to jump into DFU mode ? 

Thanks.

[Roh_Sys]

I used below link to understand DFU.

https://github.com/gamnes/nRF52832-buttonless-dfu-development-tutorial

But i am still confuse. what to add in my application so it can go in DFU mode ?

[AndreasF]

Hi.

Have you had a look at the infocenter? It is described there how you can enter DFU mode:

In the DFU mode, the bootloader activates the DFU transports and the device is ready to receive new firmware. The bootloader enters the DFU mode on the following conditions:

• No valid application is present.
• SoftDevice is activated and a valid application is present. In that case, the bootloader expects that an application update can be requested by the host.
• Entering DFU mode is triggered by one of the optional sources:
  • Button (NRF_BL_DFU_ENTER_METHOD_BUTTON),
  • Pin reset (NRF_BL_DFU_ENTER_METHOD_PINRESET),
  • Special value in GPREGRET register (NRF_BL_DFU_ENTER_METHOD_GPREGRET),
  • Request from the application written to the settings page (NRF_BL_DFU_ENTER_METHOD_BUTTONLESS).

Best regards,

Andreas

[Roh_Sys]

Hey,

I already went through that infocenter. I am using BLE as transport and NRF_BL_DFU_ENTER_METHOD_BUTTONLESS as to enter into DFU mode. 

My que is

My application is running and i want to go in DFU mode (Buttonless). How to do that ?

I mean is there anything i need to add in my current application ? 

Lets take an example to explain.

I have Hello world example in my flash memory. now i want to change that application i mean i want to flash another LED Blink example. So, how can i do that using Buttonless DFU and BL?

[AndreasF]

Hi.

I'm not really sure in understand your question.

Have you or have you not entered DFU mode?

If you are not in DFU mode, what way do you wish to enter the DFU mode?

Best regards,

Andreas

[brijeshgpt47]

hey please update this thread.

I also want to do the same as Roh_Sys want.

thanks

[Karl Ylvisaker]

Hello brijeshgpt47,

This thread is more than a year old and the customer has stopped replying.
Please create a new ticket detailing the issue you are experiencing, if you require help.

Best regards,
Karl

[Hector.a.c]

Hello, it's been a long time since you posted these questions but the answer is:

STEP 1. be sure that in the code "secure_bootloader" the macro NRF_BL_DFU_ENTER_METHOD_GPREGRET located in sdk_config.h file been equal to 1.

STEP 2. in your main application if you want to jump to DFU mode you have to execute the next code:

sd_power_gpregret_clr(0, 0xFF)
NRF_POWER->GPREGRET = BOOTLOADER_DFU_START;
// Signal that DFU mode is to be enter to the power management module
nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

wherethe value of those macros is:

#define BOOTLOADER_DFU_GPREGRET_MASK (0xB0)
#define BOOTLOADER_DFU_START_BIT_MASK (0x01)
#define BOOTLOADER_DFU_START (BOOTLOADER_DFU_GPREGRET_MASK | BOOTLOADER_DFU_START_BIT_MASK)

/**@brief Power management shutdown types. */
typedef enum
{
NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF,
//!< Go to System OFF.

NRF_PWR_MGMT_SHUTDOWN_STAY_IN_SYSOFF,
//!< Go to System OFF and stay there.
/**<
* Useful when battery level is dangerously low, for example.
*/

NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU,
//!< Go to DFU mode.

NRF_PWR_MGMT_SHUTDOWN_RESET,
//!< Reset chip.

NRF_PWR_MGMT_SHUTDOWN_CONTINUE
//!< Continue shutdown.
/**<
* This should be used by modules that block the shutdown process, when they become ready for
* shutdown.
*/
} nrf_pwr_mgmt_shutdown_t;

Also you have to include the nexts files:

#include "nrf_soc.h"

#include "nrf_power.h"

and that's all. When the application execute the line nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU); it will execute a system reset so the bootloader will read the NRF_POWER->GPREGRET register and will jump to DFU mode.

NOTE: The NRF_POWER->GPREGRET register is cleared when a hardware reset occurs. therefore if you turn off you device then you turn on it will start in your main application becose the register will be equal to 0.