How to decrease current consumption in sleep at nrf v1.3.0 tag?

[Yusuke]

I could decrease current consumption at v1.2.0, but couldn't at 1.3.0. 520uA flows in k_cpu_idle(); 

How can you do that?

Also, in v1.3.0, CONFIG_UART_0_NRF_UARTE is depricated. How can you disable UART 0 in prj.conf?

Any tip? Thanks

<environment>
- Windows10
- DK v0.9.0
- modem fw v1.2.0
- nrf v1.3.0
- Segger IDE 4.52

<prj.conf>

# General config
CONFIG_ASSERT=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y

# BSD library
CONFIG_BSD_LIBRARY=y

# AT host library
CONFIG_AT_HOST_LIBRARY=n
CONFIG_UART_INTERRUPT_DRIVEN=n

# Stacks and heaps
CONFIG_MAIN_STACK_SIZE=3072
CONFIG_HEAP_MEM_POOL_SIZE=16384

<main.c>

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
 */

#include <zephyr.h>
#include <stdio.h>
#include <drivers/uart.h>
#include <string.h>

/**@brief Recoverable BSD library error. */
void bsd_recoverable_error_handler(uint32_t err)
{
	printk("bsdlib recoverable error: %u\n", err);
}

void disable_uart0(){
	NRF_UARTE0->TASKS_STOPTX = 1;
	while(NRF_UARTE0->EVENTS_TXSTOPPED == 0);
	NRF_UARTE0->EVENTS_TXSTOPPED = 0;
	
	NRF_UARTE0->TASKS_STOPRX = 1;
	while(NRF_UARTE0->EVENTS_RXTO == 0);
	NRF_UARTE0->EVENTS_RXTO = 0;
	
	NRF_UARTE0->ENABLE = 0;
}

void main(void)
{
    disable_uart0();
    k_cpu_idle();

}

[Hakon]

Hey,

have you tried setting

CONFIG_SERIAL=n
CONFIG_LOG=n

in both prj.conf and spm.conf?

[Yusuke]

I tried it and the current increases to 1.3mA

[Yusuke]

>Can you read out the ENABLE registers for UART

How can I read it?

Why do you think this is UART issue?

Can you reproduce the power consumption issue on your side?

[Yusuke]

This also doesn't work.

&uart1 {
    status = "disabled";
};

&uart0 {
    status = "disabled";
};

[Hakon]

Yusuke said:

How can I read it?

 You can use 'nrfjprog --memrd <addr>, and replace <addr> with the address of the ENABLE registers in hex.

 

Yusuke said:

Why do you think this is UART issue?

 If the one of the uarts is enabled it will draw a significant amount of current, so you would like to have them all disabled to minimize the power consumption.

 

Yusuke said:

Can you reproduce the power consumption issue on your side?

 I will try.

[Yusuke]

You' re right, UARTE0 is enabled while it should be disabled by overlay file.

>nrfjprog --memrd 0x40008500
0x40008500: 00000008

[Hakon]

And setting it in prj.conf doesn't work either?

[Yusuke]

sleep_only.zip

This is a sleep only app. 

<nrf9160dk_nrf9160ns.overlay>

&uart0 {
    status = "disabled";
};

&uart1 {
    status = "disabled";
};

<prj.conf>

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y

# BSD library
CONFIG_BSD_LIBRARY=y

# AT host library
CONFIG_AT_HOST_LIBRARY=n
CONFIG_UART_INTERRUPT_DRIVEN=n

# Stacks and heaps
CONFIG_MAIN_STACK_SIZE=3072
CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_SERIAL=n
CONFIG_LOG=n

<main.c>

#include <zephyr.h>
#include <stdio.h>
#include <drivers/uart.h>
#include <string.h>

/**@brief Recoverable BSD library error. */
void bsd_recoverable_error_handler(uint32_t err)
{
	printk("bsdlib recoverable error: %u\n", err);
}

void disable_uart0(){
	NRF_UARTE0->TASKS_STOPTX = 1;
	while(NRF_UARTE0->EVENTS_TXSTOPPED == 0);
	NRF_UARTE0->EVENTS_TXSTOPPED = 0;
	
	NRF_UARTE0->TASKS_STOPRX = 1;
	while(NRF_UARTE0->EVENTS_RXTO == 0);
	NRF_UARTE0->EVENTS_RXTO = 0;
	
	NRF_UARTE0->ENABLE = 0;
}

void main(void)
{
    disable_uart0();
    k_cpu_idle();
    // k_sleep(K_SECONDS(60));

}

>And setting it in prj.conf doesn't work either?

I can't configure UART_0 in prj.conf in v1.3.0. I could do it in v1.2.0.

In v1.2.0, the current drops to 9uA on DK 0.9.0.

In v1.3.0, some function killing uart_0 may be added, which I don't know.

Could you try to reproduce this issue? This is a simple app.

[Yusuke]

I tweaked parameters in nrf9160dk_nrf9160 folder

I disabled i2c2 and spi3 in overlay file as well as main.c

However, nothing changed.

[Yusuke]

>You' re right, UARTE0 is enabled while it should be disabled by overlay file.

This was wrong. UARTE0 was off. I'm sorry

This works out. I don't add overlay file

<prj.conf>

CONFIG_MAIN_STACK_SIZE=3072
CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_SERIAL=y

<main.c>

#include <zephyr.h>
#include <stdio.h>
#include <drivers/uart.h>
#include <string.h>

void disable_uart(){
	NRF_UARTE0->ENABLE = 0;
    NRF_UARTE1->ENABLE = 0;
}

void main(void)
{
	disable_uart();
	k_cpu_idle();
}