nRF52832 Shockburst (not Enhanced) compatibility

[mizu42]

Hi,

Browsing the API I only saw Enhanced shockburst support. I need air compatibility to an old 250kBit plain Shockburst communication. No auto ACK and no auto retransmit and no Packet Control Field.

Is there some sample code available? Or could you point me to the right places?

Thank you!

Best,

Mike

[Kenneth]

Hello,

It is possible to setup the packet format to the legacy SB, however the nRF52-series don't support the 250kbps mode, so unfortunately it won't work. The nRF51822 can support 250kbps, the latest nRF5 SDK that support the nRF51822 is nRF5 SDK v12.3, and the closest example would be:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/nrf_dev_radio_tx_example.html

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/nrf_dev_radio_rx_example.html

Best regards,
Kenneth

[Julian Schindler]

I just got the same problem,

and found a solution by using this example: \nRF5_SDK_14.2.0_17b948a\examples\peripheral\radio\receiver

I modified the following files to communicate (Rx/Tx) successful between NRF52832 and NRF24L01+

• Shockburst (not ESB)
• 250kBit
• No auto ACK
• Default NRF24L01 RX pipe0 address (0xE7E7E7E7E7)
• Address len 5 byte
• fixed payload len: 32 byte
• CRC 16 bit

---

main.c

static uint32_t                   packet;              /**< Packet to transmit. */
static uint8_t                    packet[32];         /**< Packet to receive 32 byte. */

---

radio_config.c

void radio_configure()

{

NRF_RADIO->MODE      = (RADIO_MODE_MODE_Nrf_1Mbit << RADIO_MODE_MODE_Pos);

NRF_RADIO->MODE      = (RADIO_MODE_MODE_Nrf_250Kbit << RADIO_MODE_MODE_Pos);

...

| ((uint32_t)swap_bits(0xC0) << 0); // Prefix byte of address 0 converted to nRF24L series format

| ((uint32_t)swap_bits(0xE7) << 0); // Prefix byte of address 0 converted to nRF24L series format - default NRF24L01

....

NRF_RADIO->BASE0 = bytewise_bitswap(0x01234567UL);  // Base address for prefix 0 converted to nRF24L series format
NRF_RADIO->BASE0 = bytewise_bitswap(0xE7E7E7E7UL);  // Base address for prefix 0 converted to nRF24L series format - default

}

---

radio_config.h
#define PACKET_STATIC_LENGTH        (1UL)                   //!< Packet static length in bytes
#define PACKET_STATIC_LENGTH        (32UL)                   //!< Packet static length in bytes

[Kenneth]

Thanks for sharing the details. There is one note on the 250kbps mode that it is: Deprecated
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/radio.html#register.MODE

The 250kbps mode is no longer qualified or tested, and you will find in the electrical specifications that there are no electrical parameters listed for this mode.