# 138 questions

Tagged
• x
36
views
no
1

## how do I change PWM port to 1 on example "low_power_pwm"

Hi, I have Design a new product based on the NRF52840 I am trying to get the lcd up and running so first thing is the pwm for the backlight. I am using pin 1.08 for the pwm. but ... (more)

59
views
no
1

## NRF52832 PWM limitations

Hello,

With sdk13 and app_pwm library, I only got 9bits resolution for 32KHz freq.

The pwm should have 16bits resolution, with max freq 100KHz? please could anyone confirm that.

47
views
1
vote
1

## nRF52- PWM - Generating 8Mhz Clock

Hi,

Can Anyone has experienced with nRF52 PWM clock generation ? I am trying to generate 8-Mhz clock out of GPIO by configuring it for PWM module.. But so far I can get only 1Mhz clock maximum..

Is it possible to ... (more)

494
views
6
1

## NRF52 Dim LED with PWM Driver

I am migrating from nrf51 to nrf52. Using SDK12.1

On NRF51, I used the PWM Library to use 2 buttons on the DK to dim up or down onboard LED1 (called OUTPUT_LED). It worked great (not sure if it ... (more)

100
views
no
2

## Infrared Transmitter only with PWM driver on nrf52

Hi all,

I need to transmit an infrared beacon every X seconds and the beacon does not change over time. I am using the PWM driver on nrf52 to generate the 38kHz carrier frequency and I am currently working on ... (more)

31
views
no
no

## EVENTS_PWMPERIODEND interrupt not behaving as expected

I am trying to use the EVENTS_PWMPERIODEND interrupt to read a GPIO pin on every falling edge of an output GPIO that is driven from the PWM module.

The description in the reference manual is: EVENTS_PWMPERIODEND 0x118 Emitted at the ... (more)

42
views
no
1

## nrf51822 PWM failure

I am trying to add the example in examples\peripheral\pwm_library to another project to get pwm working. In the other project I have included all necessary stuff but I get:

..\..\..\main.c(59): error: #20: identifier "TIMER1_INSTANCE_INDEX" is undefined ... (more)

107
views
2
2

Please can anyone help me on how to use(program) PWM hardware with individual loading mode? My goal is to control 12 LEDs individually with different duty cycles and playbacks using pwm hardware which has 12 outputs to make a ... (more)

54
views
no
no

## making Tune instead of Beep using Bizzer with PWM library

i have added pwm into proximity profile example and now i am able to make beep using buzzer with pwm library.Now i want to make some sort of Tune instead of beep.

Can any one help!....Thanks.

60
views
no
no

## nRF52832 : PWM Driver Clock lower then 125kHz

Hey,

just wondering if its possible to lower the pwm driver clock of the nRF52832 to around 500Hz? Im working on a LED dimming application and the LED spots i use have really bad on/off times. Im getting much ... (more)

46
views
1
vote
1

## Do I have any restriction with HW Pinout Peripheral when using s130?

if I use softdevice 130 Enabled, then do I have any restriction with using all of the pinout of NRF51xxx?

Or if I use Nrf-51 DK, Do I have any restriction with nrf 51xxx's full pinout functionality?

To Make ... (more)

55
views
no
2

## PWM Error when using with nrf52 PCA10040 s132 nrf52832

I have implemented pwm as suggested in the info centre of nordiac semiconducter. But it showing the following error as shown below image.

Thank you.

77
views
no
no

## Using 12 hardware and 1 software channel for pwm on nrf52

Hello I am new to work on nrf52,

Please can someone help me regarding how to use hardware and software pwm together. I have a need of using 13 leds , so i need 13 pwm. As max h/w pwm ... (more)

96
views
no
1

## Outputting a PWM signal at 8Mhz with 50% dutcy cycle

We are working with SDK 12.1 and are noticing the max value we can output using the PWM driver is about 5.3Mhz (top value to 3 and 16Mhz for the clock) this isn't a 50% duty cycle ... (more)

58
views
no
1

## PWM input signal

Hi,

Is it possible to have a PWM input signal with a nRF51822? Is there any example of how it works? I want to read the dutycycle of a PWM signal.

119
views
no
no

## pwm_driver period is always 50Hz.WHY?

Hello all,

I have created a BLE application on nRF52 PCA10040 devboard with S132 SD, in which I would like to use a PWM with the PWM_Driver. My pwm source code as below wants to control an RGB LED on ... (more)

98
views
no
1

## what is the maximum limit for PWM outputs pins on nrf52832? Can we use all the GPIO pins as a PWM output?

Hello

what is the maximum limit for PWM outputs pins on nrf52832? Can we use all the GPIO pins as a PWM output?

For ADC, i can see there are 8 dedicated pins , but i want to confirm for PWM ... (more)

140
views
no
2

## Low-power PWM library: PWM doesnt stop if low_power_pwm_stop is called from handler. Is this a bug?

I am using SDK 12.0.0.

I am working with low_power_pwm_init() to initialise the pwm and I have passed a handler while initialising. I want to stop the pwm from the handler hence I am calling low_power_pwm_stop() from the ... (more)

413
views
2
2

## nRF52 PWM Glitch Error

I have an implementation that is using a PWM output to drive a LED. It has been observed that when the LED is on in a constant drive state, fixed PWM output train, the LED will "flash". i.e. change ... (more)

50
views
no
no

## pwm dimming led rgb with trouble on third and thourth channel.

i am having trouble with pwm module 2. only two of the channels are working but not the third nor the fourth. i tried pwm module 1 but im having the same problem there. i cant tell what im missing ... (more)

47
views
no
no

## nrf51822 pwm working some minutes will loss. [closed]

APP_PWM_INSTANCE(PWM1,1);

void PWM_init(void)
{
u32 err_code;

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(1000, 8);

err_code = app_pwm_init(&PWM1,&pwm1_cfg,NULL);
APP_ERROR_CHECK(err_code);
app_pwm_enable(&PWM1);
while (app_pwm_channel_duty_set(&PWM1, 0, 0) == NRF_ERROR_BUSY);
}

void PWM_Set( u8 duty )
{
if ( duty>100 )    duty = 100;

while (app_pwm_channel_duty_set(&PWM1 ...
(more)

99
views
1
vote
1

## nRF52832 No accurate 4MHz PWM output with SoftwateDevice 332 in SDK11.0.0

SDK:11.0.0

MCU:nRF52832

Using example:ble_ant_app_hrm

SoftwateDevice Version:s332

PWM is turned on and accurate 4MHz is available before entering ble_stack_init();

PWM is unstable after enterd SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL); in ble_stack_init();

How to keep 32MHz external crystal ... (more)

256
views
no
1

## nrf pwm library increases current consumption

Hi, I am using nrf pwm library from here: https://github.com/NordicSemiconducto.... I am driving two gpios for a piezo buzzer.

I call pwm_init(), then use the call set_frequency_and_duty_cycle() to start pwm. To stop, I call nrf_pwm_set_enabled(false)

The ... (more)

112
views
no
no

## PWM Driver starting new sequence with NRF52

I am not sure how exactly the NRF52 handles a call to start a new sequence. There are 3 different scenarios (trying to start a new sequence before, right after and way after the current sequence):

1) When the current ... (more)

158
views
no
1

## SDK 12 PWM Driver + Softdevice 132 + NRF52832

Hi Devzone.

I've taken the ble_app_hrs example, and then added the example code from the PWM Driver example.

The PWM module is mostly functional, however I have a fatal error that is prohibiting operation for more than a minute ... (more)

57
views
no
no

## nRF51822 PWM and GPIOTE: differrences between Keil MDK(ARMCC) and GNU_GCC_ARM Compiler

Hello everybody!

I have a problem with compilers for nRF51822. My problems: I create a pwm signal ~38Khz, duty 30% at pin 30 of nRF51822. This process is work well. I want use the function:

nrf_drv_gpiote_out_task_enable(pin)


to ... (more)

115
views
no
1

## 12 bit duty cycle resolution at 25 KHz PWM frequency

Hi,

Does anyone know if there is a way to achieve 12 bit duty cycle resolution at 25 KHz PWM frequency for 5 channels (individual duty cycle for each channel) using the NRF52823 ?

95
views
1
vote
1

## nRF52 timer has no modulus?

I'm learning about the nRF52 series and so far love everything I see, especially the SDK. But I just got to the point where I'd like to generate precisely timed output, and there is something I don't ... (more)

196
views
no
1

## rtc and app_timer

Hi,

Is it possible to use RTC for timekeeping along with app_timer functionality? For example, I want to use simple RTC counter register and overflow interrupt to provide time tracking, but also need the app_timers. The second timer is used ... (more)

93
views
no
1

## soft pwm with rtc

I would need more pwm channels, than there is possible with pwm library on nrf51822 (That is 16 channels). I would like to do it in a fashion, similar to this, using a prescaler of 15, so pwm frequency would ... (more)

#### Statistics

• Total users: 22278
• Latest user: Camilla Samons
• Resolved questions: 9667
• Total questions: 23073

## Recent blog posts

• ### Nordic Developer Zone celebrates its 4th year of helping developers succeed - Celebrate with us and win a Nordic Thingy: 52’

Posted 2017-06-23 10:12:53 by John Leonard
• ### nRF52 Development with CLion

Posted 2017-06-22 09:50:54 by dansheme
• ### Simple GPIO driver example

Posted 2017-06-22 13:38:36 by Hans Elfberg
• ### What mom didn't tell you about ble_app_att_mtu_throughput on the nRF52840 evaluation board

Posted 2017-06-16 16:12:15 by George
• ### Introducing Nordic’s new software licensing schemes

Posted 2017-06-15 11:21:39 by Reidar Martin Svendsen

## Recent questions

• ### NRF51822 to NRF51822 Over the air update (DFU)

Posted 2017-06-25 16:25:45 by wogisha
• ### Advertising with device_name Vs whitelisting

Posted 2017-06-25 14:39:12 by raju