text: /**
   * Copyright (c) 2014 - 2017, Nordic Semiconductor ASA
   * 
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   * 
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 
   * 2. Redistributions in binary form, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, must reproduce the above copyright notice, this list of
   *    conditions and the following disclaimer in the documentation and/or other
   *    materials provided with the distribution.
   * 
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   * 
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   * 
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * 
   */
  
  #include "nrf_esb.h"
  
  #include <stdbool.h>
  #include <stdint.h>
  #include "sdk_common.h"
  #include "nrf.h"
  #include "nrf_esb_error_codes.h"
  #include "nrf_delay.h"
  #include "nrf_gpio.h"
  #include "nrf_error.h"
  #include "boards.h"
  
  #define NRF_LOG_MODULE_NAME "APP"
  #include "nrf_log.h"
  #include "nrf_log_ctrl.h"
  
  uint8_t led_nr;
  
  nrf_esb_payload_t rx_payload;
  
  /*lint -save -esym(40, BUTTON_1) -esym(40, BUTTON_2) -esym(40, BUTTON_3) -esym(40, BUTTON_4) -esym(40, LED_1) -esym(40, LED_2) -esym(40, LED_3) -esym(40, LED_4) */
  
  void nrf_esb_event_handler(nrf_esb_evt_t const * p_event)
  {
      switch (p_event->evt_id)
      {
          case NRF_ESB_EVENT_TX_SUCCESS:
              NRF_LOG_DEBUG("TX SUCCESS EVENT\r\n");
              break;
          case NRF_ESB_EVENT_TX_FAILED:
              NRF_LOG_DEBUG("TX FAILED EVENT\r\n");
              break;
          case NRF_ESB_EVENT_RX_RECEIVED:
              NRF_LOG_DEBUG("RX RECEIVED EVENT\r\n");
              if (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS)
              {
                  // Set LEDs identical to the ones on the PTX.
                  nrf_gpio_pin_write(LED_1, !(rx_payload.data[1]%8>0 && rx_payload.data[1]%8<=4));
                  nrf_gpio_pin_write(LED_2, !(rx_payload.data[1]%8>1 && rx_payload.data[1]%8<=5));
                  nrf_gpio_pin_write(LED_3, !(rx_payload.data[1]%8>2 && rx_payload.data[1]%8<=6));
                  nrf_gpio_pin_write(LED_4, !(rx_payload.data[1]%8>3));
  
                  NRF_LOG_DEBUG("Receiving packet: %02x\r\n", rx_payload.data[1]);
              }
              break;
      }
  }
  
  
  void clocks_start( void )
  {
      NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
      NRF_CLOCK->TASKS_HFCLKSTART = 1;
  
      while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
  }
  
  
  void gpio_init( void )
  {
      bsp_board_leds_init();
  }
  
  
  uint32_t esb_init( void )
  {
      uint32_t err_code;
      uint8_t base_addr_0[4] = {0xE7, 0xE7, 0xE7, 0xE7};
      uint8_t base_addr_1[4] = {0xC2, 0xC2, 0xC2, 0xC2};
      uint8_t addr_prefix[8] = {0xE7, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 };
      nrf_esb_config_t nrf_esb_config         = NRF_ESB_DEFAULT_CONFIG;
      nrf_esb_config.payload_length           = 8;
      nrf_esb_config.protocol                 = NRF_ESB_PROTOCOL_ESB_DPL;
      nrf_esb_config.bitrate                  = NRF_ESB_BITRATE_2MBPS;
      nrf_esb_config.mode                     = NRF_ESB_MODE_PRX;
      nrf_esb_config.event_handler            = nrf_esb_event_handler;
      nrf_esb_config.selective_auto_ack       = false;
  
      err_code = nrf_esb_init(&nrf_esb_config);
      VERIFY_SUCCESS(err_code);
  
      err_code = nrf_esb_set_base_address_0(base_addr_0);
      VERIFY_SUCCESS(err_code);
  
      err_code = nrf_esb_set_base_address_1(base_addr_1);
      VERIFY_SUCCESS(err_code);
  
      err_code = nrf_esb_set_prefixes(addr_prefix, 8);
      VERIFY_SUCCESS(err_code);
  
      return err_code;
  }
  
  
  int main(void)
  {
      uint32_t err_code;
  
      gpio_init();
  
      err_code = NRF_LOG_INIT(NULL);
      APP_ERROR_CHECK(err_code);
  
      clocks_start();
  
      err_code = esb_init();
      APP_ERROR_CHECK(err_code);
  
      NRF_LOG_DEBUG("Enhanced ShockBurst Receiver Example running.\r\n");
  
      err_code = nrf_esb_start_rx();
      APP_ERROR_CHECK(err_code);
  
      while (true)
      {
          if (NRF_LOG_PROCESS() == false)
          {
              __WFE();
          }
      }
  }
  /*lint -restore */
  