The question is about the difference between ESP_PROTOCOL_ESB and ESP_PROTOCOL_ESB_DPL in the ESB protocol

[Danny-]

Hi，

I am using the nrf52840DK development board and running the SDK of version ncs/v2.6.0. When I flash the samples/esb/esb_ptx and samples/esb/esb_prx projects onto the two development boards respectively with the default configuration, the operation seems normal. However, when I change the protocol from ESB_PROTOCOL_ESB_DPL to ESB_PROTOCOL_ESB without modifying any other configurations, after running, the PTX device keeps reporting a TX FAILED EVENT, and the PRX device does not report any events (it is found through some logged information that this is a CRC check error). May I ask why this is the case?

int esb_initialize(void)
{
	int err;
	/* These are arbitrary default addresses. In end user products
	 * different addresses should be used for each set of devices.
	 */
	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};

	struct esb_config config = ESB_DEFAULT_CONFIG;

	config.protocol = ESB_PROTOCOL_ESB; //just change here
	config.bitrate = ESB_BITRATE_2MBPS;
	config.mode = ESB_MODE_PRX;
	config.event_handler = event_handler;
	config.selective_auto_ack = true;

	err = esb_init(&config);
	if (err) {
		return err;
	}

	err = esb_set_base_address_0(base_addr_0);
	if (err) {
		return err;
	}

	err = esb_set_base_address_1(base_addr_1);
	if (err) {
		return err;
	}

	err = esb_set_prefixes(addr_prefix, ARRAY_SIZE(addr_prefix));
	if (err) {
		return err;
	}

	return 0;
}

[Håkon Alseth]

Hi,

 

When changing ESB related parameters, it is important that both the PRX and PTX device is updated with the new configuration.

Did you re-compile and flash both devices with this latest change?

 

Kind regards,

Håkon

[Danny-]

Hi,

Yes, I recompile the program every time after changing the parameters, and reflash it to the board using the "erase and flash to board" method. It seems the problem does not lie here.

[Håkon Alseth]

Hi,

 

If you run ESB without dynamic payload length (DPL), the default configuration is to send 32 bytes, but your payload is only 8.

Try setting this on both PRX and PTX:

config.payload_length = 8;

 

Kind regards,

Håkon