About the difference between different nRF24LU1P reign marks

[xiao]

hi ，

image 1 、

image 2、

image 3、

I now use nRF24LU1P for Bootloader upgrade, using the routine is the official website of the C# Lu1BootLdrTest project, nRF24LU1P's Bootloader is using boot24lu1p-f32 (keil). Now tested two chips, nRF24LU1P-1101KZ,, nRF24LU1P-1207 (nRF24LU1P-1213), such as attachment pictures 2. I find the information found only in the suffix, but in the use of that suffix for 1101 can not upgrade, and the normal operation for the 12xx suffix upgrade to two, is this what is the difference?

the Image 1： Can not upgrade

the Image 2： Can be upgraded

the Image 3 is show C# example error message.

Chip exchange board I have tested, is still a suffix of 11xx can not be upgraded, the suffix 12xx can be upgraded;

[Hung Bui]

Hi Xiao,

The difference number on the 3rd line of the laser marking is only about the manufacturing date and lot number. First two difit is year number (2011,2012) then week number and lot number code.

The chips are no different. It could be other issue with the chip. Can you still program the chip using ISP programmer ?

[xiao]

hi Hung Bui : I am now using ISP programming can be used normally, but in the use of USB for bootloader can not be upgraded. The host computer has been shown as shown in Figure 3, and the 12xx suffix is not the problem. I tried the 11xx and 12xx of each of the 10p, 11xx can not be normal upgrade, and 12xx are available. Thanks.

[Hung Bui]

The bootloader for the nRF24LU1+ is made to be used once, after the first update it wouldn't be reuse (no way to return to bootloader mode).

In your case if you can use the bootloader several times, then it could be the bootloader from 3rd party. And there might be no bootloader on the 11xx .

How do you re-enter bootloader on the 12xx?