Doubt about blank vs s130 folders on the nRF5_SDK_12.3.0_d7731ad

[Alex Co]

Hi!

I am in the process of creating firmware for a product based in nRF52 because the firmware that comes with it does not fit my needs. So I am in the begining of the process.

For now I am trying to just blink LEDS. I am using RF5_SDK_12.3.0 and the following program resulting from modification of standard blink example (peripheral folder):

#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include "boards.h"

int main(void)
{
    nrf_gpio_cfg_output(17);
    nrf_gpio_cfg_output(19);
    // LED 0 and LED 1 blink alternately.
    while (true)
    {
      nrf_gpio_pin_set(17);
      nrf_gpio_pin_set(19);
      nrf_delay_us(1000000);
      nrf_gpio_pin_clear(17);
      nrf_gpio_pin_clear(19);
      nrf_delay_us(1000000);
    }
}

I know that that it is too tied to final board (pin numbers etc) but for now I just want to know better the product board

My question is:

If I build the (new) blinky sample in the blank branch it works in the target board. If I build blinky in the s130  folder branch leds do not blick.

Please, could you tell me the difference between branch branch and s130 branch?

I thought it was "without softdevice" and "with softdevice" but the hex file I burn in the board is more or less the same size (+- 2kbyte) so It seems that t does not have nothing to do with softdevice, right?

Thanks

Alex

[Jørgen Holmefjord]

Hi,

I thought it was "without softdevice" and "with softdevice"

Your assumption is correct, blank is without any softdevice, s130 is with softdevice. The softdevice is not merged with the application, you need to flash it separately.

You can also flash it using nRF Connect Programmer app.

Best regards,
Jørgen

[Alex Co]

After burning SD 130, it works too:-)

Thanks

[Jørgen Holmefjord]

In the s130 project, application is moved in flash to make space for softdevice at start of flash. When chip starts, it will run code inside softdevice that jumps to application. If there is no softdevice, there is no valid code in flash that will make the jump to application, causing the application to "hang".

[Alex Co]

Understood! Thank you!

I can flash SD first and app next without woring about addresses and it works! That is the magic of s130 project