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8 years, 4 months ago.
PWMOut Does not let nrf51822 sleep.
Hi I am using PwmOut for buzzer on a custom board built with nrf51822. We are using nrf51822 with mbed API. so if I have
include the mbed library with this snippet
#include <BLE_API.h>
#include "ble/GattCharacteristic.h"
PwmOut buzz(p13);
void setup()
{
//all bye related setup and button related setup
}
void loop() {
// put your main code here, to run repeatedly:
Serial.println(now());//just display current time on Serial(only used as Debugging to ensure device is running normally)
if(Serial.available()>0)
{
Serial.println(Serial.readString());
}
if(bEvent.button!=0) //Button has been pressed.
{
Serial.println("StoreButton Press");
if(bEvent.pressType==SHORT_PRESS) //type of event on button SHORT PRESS Save it LONG PRESS go to defined modes
{
storeData(bEvent.button,now()); //Store
//Clear Event
bEvent.button=0; bEvent.button=NOPRESS;
//start Advertisment
ble.startAdvertising();
}else
{
//set things as the modes you want
}
}
if(INDICATOR)
{
led1 =1;delay(500);led1 =0;delay(500);
led1 =1;delay(500);led1 =0;delay(500);
led1 =1;delay(500);led1 =0;
INDICATOR=false;
}
Serial.println("Sleeping..");
ble.waitForEvent();
}
if I remove PwmOut it sleeps so I think somewhere inside PwmOut the interrupt keeps waking up the device. how can I stop pwm when I don't need it. I use it to drive a pizzo buzzer for a second. buzz.write(0.2); delay and then buzz.write(0);....
1 Answer
8 years, 3 months ago.
You have more control over the PWM pins through functions like pwmout_init and pwmout_free function. Look at mbed-os/hal/api/PwmOut.h for information on how to use it.
Accepted Answer