RE: How do I control an external LED using nRf52832 ble board?

Chakradhar — Thu, 06 Apr 2017 13:07:20 GMT

Thank you, I will give this a try.

RE: How do I control an external LED using nRf52832 ble board?

Sigurd — Thu, 06 Apr 2017 11:44:06 GMT

Hi,

This can be solved in several ways. One solution can be to set-up a app-timer, with a timeout-handler that reads the LED-pin, and then writes the status to pin 11 at fixed intervals. When you mentioned LED-3, is this the LED3 on the DK ? If so, that LED is connected to P0.19 on the DK. Also note that you don't need to initialize or configure the LEDs on the DK yourself, this is done in the function called leds_init().

Here is one solution:

Let’s define the timer and timeout interval we want:

APP_TIMER_DEF(m_my_led_timer_id);                        /**< My LED timer. */
#define MY_LED_TIMER_INTERVAL      APP_TIMER_TICKS(100)  /**< MY_LED_TIMER_INTERVAL interval (ticks). */

The timout handler can look something like this:

static void my_led_timeout_handler(void * p_context)
{
    UNUSED_PARAMETER(p_context);
    if(nrf_gpio_pin_out_read(19) == 0)
    {
        nrf_gpio_pin_write(11,1);
    }
    else
    {
        nrf_gpio_pin_write(11,0);
    }
    
}

In main(),

Lets first config pin 11 to be a output:

nrf_gpio_cfg_output(11);

and we can then create and start the timer like this:

uint32_t err_code;

err_code = app_timer_create(&m_my_led_timer_id,
                            APP_TIMER_MODE_REPEATED,
                            my_led_timeout_handler);
APP_ERROR_CHECK(err_code);

 // Start application timers.
err_code = app_timer_start(m_my_led_timer_id, MY_LED_TIMER_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);