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Docs: Byte alignment/packing mismatches #945

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Feb 20, 2024
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Docs: Byte alignment/packing mismatches #945

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Docs: Byte alignment/packing mismatches
TMRh20 Feb 19, 2024
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2bndy5 Feb 19, 2024
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2bndy5 Feb 19, 2024
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6 changes: 6 additions & 0 deletions COMMON_ISSUES.md
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Expand Up @@ -121,6 +121,12 @@ This is likely due to the SPI speed being set up to 10MHz by default. We recomme

In the RF24 library's beginnings, the default value was (prior to 2014) set to 4MHz.

Inaccurate payloads can also happen because of differences in how 8-bit, 32-bit and 64-bit systems store data in memory. The easiest way to ensure your data aligns between devices is to specify the size of variables in code. For example, use `uint32_t` instead of `unsigned long`, and use `__attribute__((__packed__))` for data structures if you don't align your data manually per the linked blog posts (see below).

Newer users can use the `sizeof()` function to verify the size of different variables or data structures as well.

See [GNU libc doc about integers](https://www.gnu.org/software/libc/manual/html_node/Integers.html) and [TMRh20's Blog Post](https://tmrh20.blogspot.com/2020/09/transferring-data-between-systems-using.html) for more info.

### My PA/LNA module fails to transmit

You may find variants of the nRF24L01 transceiver that are marketed as “nRF24L01+PA+LNA”. These modules are distinct in the fact that they come with a detachable (SMA-type) antenna. They employ separate RFX24C01 IC with the antenna for enhanced Power Amplification (PA) and Low Noise Amplification (LNA) features. While they boast greater range with the same functionality, they are subject to a couple lesser known (and lesser advertised) drawbacks:
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