Enhanced ShockBurst Primary Transmitter (PTX) example [Projects]

---

This example sends packets continuously. The contents of P0 are sent in the first payload byte (byte 0).

The example shows the minimum required setup for transmitting packets to a primary receiver (PRX) device.

The following default radio parameters are being used:

• RF channel 2
• 2 Mbps data rate
• TX address 0xE7E7E7E7E7
• 1 byte CRC

The project Enhanced ShockBurst Primary Receiver (PRX) example can be used as a counterpart for receiving the data.

Functions
void	main (void)
	NRF_ISR ()

---

Function Documentation

void main

(

void

)

Definition at line 59 of file main.c.

{
  uint8_t payload[3];

  #ifdef MCU_NRF24LE1
  while(hal_clk_get_16m_source() != HAL_CLK_XOSC16M)
  {
    // Wait until 16 MHz crystal oscillator is running
  }
  #endif

  #ifdef MCU_NRF24LU1P
  // Enable radio SPI
  RFCTL = 0x10U;
  #endif

  // Enable the radio clock
  RFCKEN = 1U;

  // Enable RF interrupt
  RF = 1U;

  // Enable global interrupt
  EA = 1U;

  // Power up radio
  hal_nrf_set_power_mode(HAL_NRF_PWR_UP);

  for(;;)
  {
    // Put P0 contents in payload[0]
    payload[0] = ~P0;

    // Write payload to radio TX FIFO
    hal_nrf_write_tx_payload(payload, 3U);

    // Toggle radio CE signal to start transmission
    CE_PULSE();

    radio_busy = true;
    // Wait for radio operation to finish
    while (radio_busy)
    {
    }
  }
}

NRF_ISR

(

)

Definition at line 107 of file main.c.

{
  uint8_t irq_flags;

  // Read and clear IRQ flags from radio
  irq_flags = hal_nrf_get_clear_irq_flags();

  switch(irq_flags)
  {
    // Transmission success
    case (1 << (uint8_t)HAL_NRF_TX_DS):
      radio_busy = false;
      // Data has been sent
      break;
    // Transmission failed (maximum re-transmits)
    case (1 << (uint8_t)HAL_NRF_MAX_RT):
      // When a MAX_RT interrupt occurs the TX payload will not be removed from the TX FIFO.
      // If the packet is to be discarded this must be done manually by flushing the TX FIFO.
      // Alternatively, CE_PULSE() can be called re-starting transmission of the payload.
      // (Will only be possible after the radio irq flags are cleared)
      hal_nrf_flush_tx();
      radio_busy = false;
      break;
    default:
      break;
  }
}