NRF91 power save mode with CONFIG_SERIAL=y

Question

Hi, 
 as I understand (and tried), in order to get low power consumption on the NRF91, I need to to get CONFIG_SERIAL=n. 
 However , I need the uart to be enabled (for short periods of time every few hours). 
 Is it possible to Change this flag at runtime ? 
 Thanks, 
 Moshe

Yusuke · Accepted Answer

Hi, Bjorn. Thank you so much! This code works out. 
 void disable_uart(){
 NRF_UARTE0->TASKS_STOPTX = 1;
 NRF_UARTE0->TASKS_STOPRX = 1;

 NRF_UARTE3->TASKS_STOPTX = 1;
 NRF_UARTE3->TASKS_STOPRX = 1;
}

void enable_uart(){
 NRF_UARTE0->TASKS_STARTRX = 1;

 NRF_UARTE3->TASKS_STARTRX = 1;
} 
 A current around 25uA is consumed on DK v0.8.5 while the UART RX is off. Is this reasonable value? I read datasheet and it doesn't describe current consumption of UART. Let me know the value, if you have measured.

NRF91 power save mode with CONFIG_SERIAL=y

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