nrf52832 does not work well at power on

[bijian]

I download my program to PCA10040 DK board and the program will make the led1 blink two times. First I download program to flash and all work well.The led1 will blink two times and stop. But when the board power off and then power on again,the led1 will blink all the time and will not stop. At this time,I open "options for target"--"debug"--"settings" and have a look at the jlink and target cpu,then close the dialog,the program works well again! but when power off...

I try to add " while(1); " to the end of my led1 blink code. All work well,even though power off and power on again. Why? I know the function of "while(1);",but I'm sure I only make the led1 blinky two times. I'm so confused.

[Petter Myhre]

Could you edit your question and include the actual code you are referencing? What do you mean by when the board power off and then power on again?

[bijian]

first download my code to PCA10040 DK, all work fine. There is a switch in the DK, when I switch off the board and switch on again,it goes wrong.

int main(void)

{

uint8_t num = 0;

nrf_gpio_cfg_output(18);

while ( num < 2 )

{

num++;

nrf_gpio_pin_write(18,0);

nrf_delay_ms(500);

nrf_gpio_pin_write(18,1);

nrf_delay_ms(500);

}

// while(1);

/***************************
... //other code, first comment then to test other code.

***************************/

}

what's the difference if there is a "while (1);" or not ? what I see is that led1 will blinks two times or blinks all the time? Why?

[bijian]

the pin DCC of nrf52832 in my PCB is disconnected, but I use "sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);" ,which will cause some problems.But the PCA10040 DK's DCC pin is connected to to the right components,it still can not work well,so there are some other problems in my code. I'm finding.

[Petter Myhre]

What does your PCB have to do with this? Are you testing this on your PCB or a PCA10040?

[Petter Myhre]

I just tested your code on a PCA10040. It seems to be working fine, its behavior is the same every time, the LED blinks two times, after power off and power on.