NRF52832 sdk14.2 POF function error

[mokoysh]

Hi

    I am testing POF function on 52832 based on SDK14.2 and  SDK17.0. And test project  is SDK example ble_app_beacon.

Code as show:

#include "nrf_drv_power.h"
static void pof_deal(void)
{
SYS_LOG("---------------pof_deal-----------------\r\n");
}
static void pof_init(void)
{
static uint8_t flag = 0;
if(flag == 0)
{
flag = 1;
nrf_drv_power_pofwarn_config_t pof_config;
pof_config.handler = pof_deal;
pof_config.thr = NRF_POWER_POFTHR_V27;//27
uint32_t ret = nrf_drv_power_pof_init(&pof_config);
SYS_LOG("driver powe ret is %d\r\n",ret);
}
}

In SDK17.0  ,when I lower the chip working voltage to 2.6V，the POF interrupt  trigger  .

But in SDK 14.2 ,nothing happens. And I see the register NRF_POWER->PONCON value =0X00000001 after  nrf_drv_power_pof_init.

Because the SDK of our device firmware is 14.2, we can only use POF function to DEBUG on 14.2.

How should I use POF function in SDK14.2?

[Simonr]

Hi

I think this might be because your application in SDK v14.2.0 is not running the HFCLK by default, as the POF will not operate nor consume power in System OFF, or while the HFCLK is not running, even if left enabled by software.

Another option to warn the POF or to turn the device off when the voltage goes too low, is to use the comparator instead, as it is also operable in sleep modes as well, and it won't mess with the flash writes. 

Best regards,

Simon

[mokoysh]

Hi

    I thought about what you said, but  the NRF_POWER->PONCON =0x00000001 after nrf_drv_power_pof_init,so I think the threshold was not successfully configured.