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.

[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.

[Karl Ylvisaker]

Hello,

Thank you for providing us with an update on this, Hector! :) 
I assume that brijeshgpt47 created a separate ticket for this, but its great to have your comment here for completeness / future reference.

Best regards,
Karl