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  • Case ID: 119676
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BLE Nano/Nordic SDK: making a quick buzz from a piezo speaker

tyler

I am working on a project using a ble nano (nrf51822) using the Nordic SDK 8.1. I started building off the ble-app-hrs in the examples of the documentation so my code is pretty similar to the example.
What I am trying to do is to have a piezo speaker make a quick couple of buzzes when a bond is made. To do this I went into the bsp_led_indication() method in bsp.c and added the following code for the BSP_INDICATE_CONNECTED case:

 case BSP_INDICATE_CONNECTED: // This case is used when a connection is made
        printf("BSP_INDICATE_CONNECTED\n");

        COMPONENTS_OFF(COMPONENTS_MASK & ~BSP_LED_0_MASK & ~ALERT_LED_MASK);
        COMPONENTS_ON(BSP_LED_0_MASK);

        beepCount++;
        if (beepCount <= 6) {
            COMPONENTS_INVERT(BSP_BUZZER_MASK);
            app_timer_start(m_leds_timer_id, BSP_MS_TO_TICK(500), NULL);
        }

        m_stable_state = indicate;
        break;

please not that I updated the boards.h file to add the following methods:

` #define COMPONENTS_ON(components_mask) do { NRF_GPIO->OUTSET = (components_mask) & (COMPONENTS_MASK & COMPONENTS_INV_MASK);
NRF_GPIO->OUTCLR = (components_mask) & (COMPONENTS_MASK & ~COMPONENTS_INV_MASK); } while (0)

#define COMPONENTS_OFF(components_mask) do { NRF_GPIO->OUTCLR = (components_mask) & (COMPONENTS_MASK & COMPONENTS_INV_MASK);
NRF_GPIO->OUTSET = (components_mask) & (COMPONENTS_MASK & ~COMPONENTS_INV_MASK); } while (0)

#define COMPONENTS_IS_ON(components_mask) ((components_mask) & (NRF_GPIO->OUT ^ COMPONENTS_INV_MASK) )

#define COMPONENTS_INVERT(components_mask) do { uint32_t gpio_state = NRF_GPIO->OUT;
NRF_GPIO->OUTSET = ((components_mask) & ~gpio_state);
NRF_GPIO->OUTCLR = ((components_mask) & gpio_state); } while (0)`

The problem I have now is that the buzzer will buzz for inconsistent times. for example, some times when a bond is made the buzzer will ring for 2 or 3 seconds before turning off and back on again (even though the delay is set to 500 ms). Is there a better way I can create a buzzing sound than adding a timer that recalls the bsp_led_indication() method? Also is there an easy way I can change the tone or pitch of the buzzer to improve the sound quality (currently the buzzer just makes an awful screeching sound when it is activated... This may just be due to the quality of the piezo speaker I purchased (I got it from radio shack). Is there a better component to make a beep sound?)

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    @sigurd Yes I was looking at the example in \examples\peripheral\pwm. It doesn't do a good job of explaining what each variable does though. Like it doesn't have a variable set for the duty cycle or frequency which I need to know how to set. ..... The peripheral\pwm is actually the example I was previously using when I was having problems..... I think I may have used a pin without PWM but I'm not sure (how do I check if the pin has PWM ability). All I know is that I went in and changed the 'value' variable and the tone and volume of the buzzer was not impacted. How can I go about fixing this?

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    @sigurd Yes I was looking at the example in \examples\peripheral\pwm. It doesn't do a good job of explaining what each variable does though. Like it doesn't have a variable set for the duty cycle or frequency which I need to know how to set. ..... The peripheral\pwm is actually the example I was previously using when I was having problems..... I think I may have used a pin without PWM but I'm not sure (how do I check if the pin has PWM ability). All I know is that I went in and changed the 'value' variable and the tone and volume of the buzzer was not impacted. How can I go about fixing this?

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