text: /* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
   *
   * The information contained herein is property of Nordic Semiconductor ASA.
   * Terms and conditions of usage are described in detail in NORDIC
   * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
   *
   * Licensees are granted free, non-transferable use of the information. NO
   * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
   * the file.
   *
   */
  
  #include "nrf_esb.h"
  
  #include <stdbool.h>
  #include <stdint.h>
  #include <string.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 "nrf_log.h"
  #include "boards.h"
  #include "nrf_log.h"
  
  #define LED_ON          0
  #define LED_OFF         1
  
  void nrf_esb_error_handler(uint32_t err_code, uint32_t line)
  {
  #if DEBUG //lint -e553
      while(true);
  #else
      NVIC_SystemReset();
  #endif
  
  }
  
  #define APP_ERROR_CHECK(err_code) if(err_code) nrf_esb_error_handler(err_code, __LINE__);
  
  //#define NRF_ESB_LEGACY
  
  /*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) */
  
  static nrf_esb_payload_t tx_payload;
  static nrf_esb_payload_t rx_payload;
  static uint8_t m_state[4];
  const uint8_t leds_list[LEDS_NUMBER] = LEDS_LIST;
  uint8_t led_nr;
  
  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("SUCCESS\r\n");
              break;
          case NRF_ESB_EVENT_TX_FAILED:
              NRF_LOG("FAILED\r\n");
              (void) nrf_esb_flush_tx();
              break;
          case NRF_ESB_EVENT_RX_RECEIVED:
              while (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS) ;
              NRF_LOG("Receiving packet: ");
              NRF_LOG_HEX_CHAR(rx_payload.data[0]);
              NRF_LOG("\r\n");
  
              switch (rx_payload.data[0] & 0xFUL)
              {
                  case 0x1:
                      m_state[0] = !m_state[0];
                      nrf_gpio_pin_write(LED_1, m_state[0]);
                      break;
  
                  case 0x2:
                      m_state[1] = !m_state[1];
                      nrf_gpio_pin_write(LED_2, m_state[1]);
                      break;
  
                  case 0x4:
                      m_state[2] = !m_state[2];
                      nrf_gpio_pin_write(LED_3, m_state[2]);
                      break;
  
                  case 0x8:
                      m_state[3] = !m_state[3];
                      nrf_gpio_pin_write(LED_4, m_state[3]);
                      break;
              }
  
              nrf_gpio_pin_write(LED_1, m_state[0]);
              nrf_gpio_pin_write(LED_2, m_state[1]);
              nrf_gpio_pin_write(LED_3, m_state[2]);
              nrf_gpio_pin_write(LED_4, m_state[3]);
  
              tx_payload.length = 1;
              tx_payload.data[0] = m_state[0] << 0
                                 | m_state[1] << 1
                                 | m_state[2] << 2
                                 | m_state[3] << 3;
              (void) nrf_esb_write_payload(&tx_payload);
  
              NRF_LOG("Queue transmitt packet: ");
              NRF_LOG_HEX_CHAR(tx_payload.data[0]);
              NRF_LOG("\r\n");
              break;
      }
  
  
  
  }
  
  
  void clocks_start( void )
  {
      // Start HFCLK and wait for it to start.
      NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
      NRF_CLOCK->TASKS_HFCLKSTART = 1;
      while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
  }
  
  
  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 };
  
  #ifndef NRF_ESB_LEGACY
      nrf_esb_config_t nrf_esb_config         = NRF_ESB_DEFAULT_CONFIG;
  #else // NRF_ESB_LEGACY
      nrf_esb_config_t nrf_esb_config         = NRF_ESB_LEGACY_CONFIG;
  #endif // NRF_ESB_LEGACY
      nrf_esb_config.selective_auto_ack       = 0;
      nrf_esb_config.payload_length           = 3;
      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;
  
      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);
  
      tx_payload.length = 1;
  
      return NRF_SUCCESS;
  }
  
  void gpio_init( void )
  {
      m_state[0] = LED_OFF;
      m_state[1] = LED_OFF;
      m_state[2] = LED_OFF;
      m_state[3] = LED_OFF;
  
      //nrf_gpio_range_cfg_output(8, 31);
      LEDS_CONFIGURE(LEDS_MASK);
  
      nrf_gpio_pin_write(LED_1, m_state[0]);
      nrf_gpio_pin_write(LED_2, m_state[1]);
      nrf_gpio_pin_write(LED_3, m_state[2]);
      nrf_gpio_pin_write(LED_4, m_state[3]);
  }
  
  
  uint32_t logging_init( void )
  {
      uint32_t err_code;
      err_code = NRF_LOG_INIT();
      return err_code;
  }
  
  
  void power_manage( void )
  {
      // WFE - SEV - WFE sequence to wait until a radio event require further actions.
      __WFE();
      __SEV();
      __WFE();
  }
  
  
  int main(void)
  {
      uint32_t err_code;
      err_code = logging_init();
      APP_ERROR_CHECK(err_code);
      gpio_init();
      err_code = esb_init();
      APP_ERROR_CHECK(err_code);
      clocks_start();
  
      NRF_LOG("Enhanced ShockBurst Receiver Example running.\r\n");
  
      err_code = nrf_esb_start_rx();
      APP_ERROR_CHECK(err_code);
  
      tx_payload.data[0] = m_state[0] << 0
                         | m_state[1] << 1
                         | m_state[2] << 2
                         | m_state[3] << 3;
      err_code = nrf_esb_write_payload(&tx_payload);
      APP_ERROR_CHECK(err_code);
  
      while (true)
      {
          power_manage();
      }
  }
  /*lint -restore */
  