My goal was to make a bootloader, that, when not requested, still goes do DFU mode for 5 seconds,
so that there is always an option to get to the bootloader after boot, even when the application is too broken to request it.
My issue is that in my main app, the softdevice somehow fails to initialize, if the app was started from the bootloader after SD initialization in the bootloader.
I assume that the issue might be an already initialized softdevice by the bootloader.
So, is there any chance I can boot into the application from the bootloader after already enabling everthing BLE-relevant in the bootloader?
Here is my modified nrf_dfu.c:
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#include "nrf_dfu.h"
#include "nrf_dfu_transport.h"
#include "nrf_dfu_utils.h"
#include "nrf_bootloader_app_start.h"
#include "nrf_dfu_settings.h"
#include "nrf_gpio.h"
#include "app_scheduler.h"
#include "app_timer_appsh.h"
#include "nrf_log.h"
#include "boards.h"
#include "nrf_bootloader_info.h"
#include "nrf_dfu_req_handler.h"
#define SCHED_MAX_EVENT_DATA_SIZE MAX(APP_TIMER_SCHED_EVT_SIZE, 0) /**< Maximum size of scheduler events. */
#define SCHED_QUEUE_SIZE 20 /**< Maximum number of events in the scheduler queue. */
#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */
#define APPLICATION_START_TIMEOUT APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)
APP_TIMER_DEF(application_start_timer);
// Weak function implementation
/** @brief Weak implemenation of nrf_dfu_check_enter.
*
* @note This function must be overridden to enable entering DFU mode at will.
* Default behaviour is to enter DFU when BOOTLOADER_BUTTON is pressed.
*/
__WEAK bool nrf_dfu_enter_check(void)
{
/*
if (nrf_gpio_pin_read(BOOTLOADER_BUTTON) == 0)
{
return true;
}
*/
if (s_dfu_settings.enter_buttonless_dfu == 1)
{
s_dfu_settings.enter_buttonless_dfu = 0;
APP_ERROR_CHECK(nrf_dfu_settings_write(NULL));
return true;
}
return false;
}
void application_start_timer_handler(void * context){
NRF_LOG_INFO("application start timeout\n");
if (nrf_dfu_app_is_valid())
{
NRF_LOG_INFO("Jumping to: 0x%08x\r\n", MAIN_APPLICATION_START_ADDR);
nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);
}else{
NRF_LOG_ERROR("no valid app\n");
}
}
// Internal Functions
/**@brief Function for initializing the timer handler module (app_timer).
*/
static void timers_init(void)
{
// Initialize timer module, making it use the scheduler.
APP_TIMER_APPSH_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, true);
app_timer_create(
&application_start_timer,
APP_TIMER_MODE_SINGLE_SHOT,
application_start_timer_handler
);
}
/** @brief Function for event scheduler initialization.
*/
static void scheduler_init(void)
{
APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE);
}
static void wait_for_event()
{
// Transport is waiting for event?
while(true)
{
// Can't be emptied like this because of lack of static variables
app_sched_execute();
}
}
void nrf_dfu_wait()
{
app_sched_execute();
}
uint32_t nrf_dfu_init()
{
uint32_t ret_val = NRF_SUCCESS;
uint32_t enter_bootloader_mode = 0;
NRF_LOG_INFO("In real nrf_dfu_init\r\n");
nrf_dfu_settings_init();
// Continue ongoing DFU operations
// Note that this part does not rely on SoftDevice interaction
ret_val = nrf_dfu_continue(&enter_bootloader_mode);
if(ret_val != NRF_SUCCESS)
{
NRF_LOG_INFO("Could not continue DFU operation: 0x%08x\r\n");
enter_bootloader_mode = 1;
}
// Check if there is a reason to enter DFU mode
// besides the effect of the continuation
if (nrf_dfu_enter_check())
{
NRF_LOG_INFO("Application sent bootloader request\n");
enter_bootloader_mode = 1;
}
bool start_application_timer = enter_bootloader_mode == 0;
enter_bootloader_mode = 1;
if(enter_bootloader_mode != 0 || !nrf_dfu_app_is_valid())
{
timers_init();
scheduler_init();
// Initializing transports
ret_val = nrf_dfu_transports_init();
if (ret_val != NRF_SUCCESS)
{
NRF_LOG_INFO("Could not initalize DFU transport: 0x%08x\r\n");
return ret_val;
}
(void)nrf_dfu_req_handler_init();
if(start_application_timer){
NRF_LOG_INFO("starting bootloader timeout\n");
app_timer_start(
application_start_timer,
APPLICATION_START_TIMEOUT,
NULL
);
}
// This function will never return
NRF_LOG_INFO("Waiting for events\r\n");
wait_for_event();
NRF_LOG_INFO("After waiting for events\r\n");
}
if (nrf_dfu_app_is_valid())
{
NRF_LOG_INFO("Jumping to: 0x%08x\r\n", MAIN_APPLICATION_START_ADDR);
nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR);
}
// Should not be reached!
NRF_LOG_INFO("After real nrf_dfu_init\r\n");
return NRF_SUCCESS;
}
