Changing Buzzer BEEP to tone

[Sunil vignesh]

Hi, I am doing some development in nrf52810. where i want to use BUZZER to produce TONES 

I am using SDK17.0.2 SES

I want to create tones instead of just beep sound in the buzzer like

G6 , A6, B6. these are represent the frequency like 2093 Hz , 1568Hz

How to create these kind of multi frequency to create tone in nrf52. provide some related documents or examples

Thanks,

[Kenneth]

Maybe you can find this useful: https://devzone.nordicsemi.com/f/nordic-q-a/52878/pwm-audio-driver 

Kenneth

[Sunil vignesh]

Hi Kenneth,

  Thanks for the reply, I have seen that example that playing one frequency at the time i think so. but i have to genrate the tone like

1478hz  - 1000ms

2500hz  - 500ms

3578hz  - 700ms

2943hz  - 250ms

all together one tone so. that i need to play multiple tones in button action

also i have seen TONE library in Arduino

syntax like

tone(pin, frequency)
tone(pin, frequency, duration)

is there any library like this in nrf52

[Sunil vignesh]

I found some file buzzer.c and buzzer.h in this link

is it for nrf51.

There i found that buzzer_on (frequency , duration);

but i can't able to convert to nrf52

can you help me to solve this

[Kenneth]

The PWM peripheral are going to play whatever sequence that is in RAM, so if you need to output multi frequency tones you would need create a sequence that do this. I do not see any ready made example that can do this for you, it looks like even Arduino only support one tone at a time:

"Only one tone can be generated at a time. "
https://www.arduino.cc/reference/en/language/functions/advanced-io/tone/ 

[Sunil vignesh]

HI Kenneth,

 I found some thing in THNIGY52  that

playing piano .And I have seen the SDK that having the function called

uint32_t drv_speaker_tone_start(uint16_t freq_hz, uint32_t duration_ms, uint8_t volume);

and i have used this to generate frequency in output . but i have an issue that

i can't find  arm_sin_f32(),

it through an error as undefined . but i include arm_math.h

even though it through an error .

instead of arm_sin_f32 i used sin is it ok or i have to use arm_sin_f32