Problems with versions of NRF24L01+

[orbitcoms]

I have been using SMD modules with NRF24L01+ fitted.

The first batch I used worked fine for months.

Then I purchased another batch and found the tx_ds_active or max_rt_active flags were not being cleared in time after transmit, so I replaced the line below with a 2ms delay

while((! nrf24l01_irq_tx_ds_active())&&( !nrf24l01_irq_max_rt_active())){}

The code worked fine now and then recently I bought a new batch and now I get no transmission at all.

Has something changed in the versions that require my code to be altered (timing or otherwise)?

The current batch that does NOT work is labelled "NRF M  24L01 +  1808 AH"

The previous batch that DID work ok is labelled "NRF M 24L01 + 1715 AH"

It looks like some spec or timing or command has changed between batch 1715 and 1808

[run_ar]

Hi,

Where did you purchase the latest batch that does not work? i.e. which distributor?

[orbitcoms]

We did not buy the devices. We purchased complete RF Modules with the device fitted already (the SMD 1.27mm version).

The modules themselves are identical but the date codes on the NRF24L01+ are different. The 2017 marked devices work fine but the 2018 do not (They are marked NRF24L01+ M, 1808 A H (need to double confirm second letter in the morning, is letter after year/week is A.

[run_ar]

Who is the module manufacturer and which distributor did you buy them from?

[orbitcoms]

I do not know the manufacturer. We purchased initially via Zitrok and then Walsoon.

How can we determine if it is genuine Nordic IC being used? The Numbers on device are

NRF   M

24L01 +

1808  A H

Doesn't this give us the year, week and location of manufacture?

Is there an ID we can read from the device using SPI that can be used to check if genuine?

[orbitcoms]

Do you have contact for any company that make a module as shown above who do purchase and use your genuine Nordic IC. I cannot find a manufacturer and the sellers are all Chinese companies, making it hard to determine whether the IC is genuine on the module.