pcb shuts down when bootloader starts - (just opened in a new thread for some order)

Question

working with nrf52832, sdk 16.0 s132 v7.01 
 
 in the uart example i get to this place in the code : 
 uint32_t nrf_dfu_transports_init(nrf_dfu_observer_t observer)
{
 uint32_t const num_transports = DFU_TRANS_SECTION_ITEM_COUNT;
 uint32_t ret_val = NRF_SUCCESS;

 NRF_LOG_DEBUG("Initializing transports (found: %d)", num_transports);

 for (uint32_t i = 0; i < num_transports; i++)
 {
 nrf_dfu_transport_t * const trans = DFU_TRANS_SECTION_ITEM_GET(i);
in this line i get a pin toggle -> ret_val = trans->init_func(observer);
 if (ret_val != NRF_SUCCESS)
 {
 NRF_LOG_DEBUG("Failed to initialize transport %d, error %d", i, ret_val);
 break;
 }
 } 
 
 i get a pin toggle which makes my system do some unwanted things 
 the toggle is for about 12 microseconds so it is quite short and maybe we can overcome it with hardware but i would still love to solve it in the software and understand the reason 
 if i use the dfu via ble example then i don't get the toggle, so where lies the difference ? 
 
 OK FOUND OUT THE ISSUE: 
 in my system (pcb) pin p0_05 is a power control pin and in the nrf board PCA_10040 it is the uart RTS_PIN_NUMBER, so can i just configure it to a different pin in my board or can i disable the flow control, will it not affect the dfu via serial, considering i use nrfutil dfu over serial on the other side ??

hope to read from you soon on that matter 
 best regards 
 Ziv

ziv123 · Accepted Answer

ziv123 said: OK FOUND OUT THE ISSUE: 
 in my system (pcb) pin p0_05 is a power control pin and in the nrf board PCA_10040 it is the uart RTS_PIN_NUMBER, so can i just configure it to a different pin in my board or can i disable the flow control, will it not affect the dfu via serial, considering i use nrfutil dfu over serial on the other side ?? 
 just change this setting in the sdk_config in case of working only with rx and tx there is no flow control involve 
 //==========================================================
// <q> NRF_DFU_SERIAL_UART_USES_HWFC - HWFC configuration
 

#ifndef NRF_DFU_SERIAL_UART_USES_HWFC
#define NRF_DFU_SERIAL_UART_USES_HWFC 0 // 1
#endif

ziv123 · Answer

ok found the answer (i think, cause i always find out more goats as i move along :) ) in this post (Sigurd replay seems to work with out to many configurations):

https://devzone.nordicsemi.com/f/nordic-q-a/62831/problem-with-serial-dfu-when-performing-from-nrfutil

use this line of command

nrfutil dfu serial -pkg <App_file_name>.zip -p COM<X> -b 9600 -fc 0 -prn 1

don't forget to change the baud rate in the bootloader:

// <o> UART_DEFAULT_CONFIG_BAUDRATE  - Default Baudrate
 
// <323584=> 1200 baud 
// <643072=> 2400 baud 
// <1290240=> 4800 baud 
// <2576384=> 9600 baud 
// <3862528=> 14400 baud 
// <5152768=> 19200 baud 
// <7716864=> 28800 baud 
// <10289152=> 38400 baud 
// <15400960=> 57600 baud 
// <20615168=> 76800 baud 
// <30801920=> 115200 baud 
// <61865984=> 230400 baud 
// <67108864=> 250000 baud 
// <121634816=> 460800 baud 
// <251658240=> 921600 baud 
// <268435456=> 1000000 baud 

#ifndef UART_DEFAULT_CONFIG_BAUDRATE
#define UART_DEFAULT_CONFIG_BAUDRATE 2576384// 30801920
#endif

thanks to all

pcb shuts down when bootloader starts - (just opened in a new thread for some order)

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