I am a beginner for BLE. I want my ble to communicate with my nrf android app.

[Abhimanyu K K]

I am using Keil uvision. Working with example codes, with uart example I got the code to send a data to mobile app through ble. But I cannot find code for receiving a data by ble which is send from the mobile app. Please help me. I need a code, such that when I send a data (let it be "ON") from my mobile to the connected ble , a led must ON. And similarly when I send "OFF" the led must OFF.

[wlgrd]

Download this app https://play.google.com/store/apps/details?id=no.nordicsemi.android.nrfblinky

Use the firmware found in <SDK>\examples\ble_peripheral\ble_app_blinky

Out of the box, this does exactly what you want. 

Source code for the Android application: github.com/.../Android-nRF-Blinky

[Abhimanyu K K]

I am using St link,  while flashing blinky pgm there come an error box showing no L-link found.

So I need the codes for just receive and take the data send from the app.

[Abhimanyu K K]

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
for (uint32_t i = 0; i < length; i++)
{
// getData(p_data, bleRecData, i);

while (app_uart_put(p_data[i]) != NRF_SUCCESS);
}
while (app_uart_put('\r') != NRF_SUCCESS);
while (app_uart_put('\n') != NRF_SUCCESS);
}

There is no BLE_NUS_EVT_RX_DATA .

[Bjørn Kvaale]

Abhimanyu K K Are you referring to UART & Blinky programs provided by ST-Link? Or the ones in the nRF5 SDK?

There are multiple ways you can do this. As mentioned, you can modify the ble_uart program to blink a led when you write 0x0 or 0x1 from the mobile phone to the peripheral device. Otherwise, you could also take a look at the ble_app_blinky example provided in the nRF5 SDK & create a new boards file that will work with your MDBT40.

[Abhimanyu K K]

I got the answer. I am now able to send data (string) from my mobile to BLE device.

In the main loop I didn't write any code. In main() function there are some function call statements as it is in the BLE UART example pgm.

while(1)
	 {
		 if(i==500)
		 {
		  i=0;
		 }
		power_manage();
	 }

But I coded inside the nus_data_handler() function.

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{

	uint8_t k=0;
	if (strstr((char*)(p_data), "on")) {
    nrf_gpio_pin_write(1,1);
		printf("ON");
  }
	
	else if (strstr((char*)(p_data), "off")) {
    nrf_gpio_pin_write(1,0);
		printf("OFF");
  }
	
	else if(strstr((char*)(p_data), "toggle")) {
		while(k<10){
		nrf_gpio_pin_toggle(1);
		printf("TOGGLE");
			Delay_ms(100);
			k++;
		}
  }
	
}

When I send "on" from my mobile, then the GPIO pin 1 will become high.

And when I send "off" , the GPIO pin 1 will set low.

And at last, when I send "toggle", the pin 1 will start toggle for 10 times, as I coded.

[Ashish]

My bad, I didn't see that you are using sdk v12. The newer sdk has this event.

[Abhimanyu K K]

That's OK man, I got that and now I'm looking for OTA & Bootloader. Can you please help me that???