Need help with the ble_app_uart example

Question

Hello Everyone, 
 I am a beginner and working on nRF52832 DK using SDK v15 and using keil mdk armv5.25 as a compiler. Currently I am trying to modify an example in the SDK which is ble_app_uart. I want to modify such that whenever i send "LED1_ON" from my mobile to the DK over ble, the LED 1 on the board should turn on and vice versa, also the opposite happens when i send "LED1_OFF" from mobile. Please help me out with issue as I have tried but cant understand things properly.

Einar Thorsrud · Accepted Answer

Hi, 
 Please find the attached diff which shows exactly what you need to do.

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 main.c.diff 
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 diff --git a/examples/ble_peripheral/ble_app_uart/main.c b/examples/ble_peripheral/ble_app_uart/main.c
index 16ab0a1..f01405a 100644
--- a/examples/ble_peripheral/ble_app_uart/main.c
+++ b/examples/ble_peripheral/ble_app_uart/main.c
@@ -203,6 +203,17 @@ static void nus_data_handler(ble_nus_evt_t * p_evt)
 NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
 NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);
 
+ if (strcmp(p_evt->params.rx_data.p_data, "LED1_ON") == 0)
+ {
+ NRF_LOG_DEBUG("Turning on LED 1");
+ nrf_gpio_pin_clear(BSP_LED_0);
+ }
+ else if (strcmp(p_evt->params.rx_data.p_data, "LED1_OFF") == 0)
+ {
+ NRF_LOG_DEBUG("Turning off LED 1");
+ nrf_gpio_pin_set(BSP_LED_0);
+ }
+
 for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
 {
 do
@@ -311,11 +322,8 @@ static void conn_params_init(void)
 */
 static void sleep_mode_enter(void)
 {
- uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
- APP_ERROR_CHECK(err_code);
-
 // Prepare wakeup buttons.
- err_code = bsp_btn_ble_sleep_mode_prepare();
+ uint32_t err_code = bsp_btn_ble_sleep_mode_prepare();
 APP_ERROR_CHECK(err_code);
 
 // Go to system-off mode (this function will not return; wakeup will cause a reset).
@@ -337,8 +345,6 @@ static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
 switch (ble_adv_evt)
 {
 case BLE_ADV_EVT_FAST:
- err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
- APP_ERROR_CHECK(err_code);
 break;
 case BLE_ADV_EVT_IDLE:
 sleep_mode_enter();
@@ -362,8 +368,6 @@ static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
 {
 case BLE_GAP_EVT_CONNECTED:
 NRF_LOG_INFO("Connected");
- err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
- APP_ERROR_CHECK(err_code);
 m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
 err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
 APP_ERROR_CHECK(err_code);
@@ -633,12 +637,15 @@ static void buttons_leds_init(bool * p_erase_bonds)
 {
 bsp_event_t startup_event;
 
- uint32_t err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler);
+ uint32_t err_code = bsp_init(BSP_INIT_BUTTONS, bsp_event_handler);
 APP_ERROR_CHECK(err_code);
 
 err_code = bsp_btn_ble_init(NULL, &startup_event);
 APP_ERROR_CHECK(err_code);
 
+ // Configure GPIO's for LED's as output without using the BSP
+ nrf_gpio_range_cfg_output(BSP_LED_0, BSP_LED_3);
+
 *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
 }

Need help with the ble_app_uart example

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