Hello @decalvus
First let me thank you for posting.
The data size selection in SPI is important because it determines the resolution and range of values that can be transmitted in a single communication transaction. Here's an explanation of the different data size options:
1- 4-bit data size: With a 4-bit data size, each data element transferred during an SPI transaction is represented using 4 bits. This allows for a range of values from 0 to 15 (2^4 - 1). A 4-bit data size is less common but can be useful in certain applications where limited precision is required, or when the transmitted data is compact and can be represented within a small range.
2- 8-bit data size: An 8-bit data size is the most common option in SPI. Each data element is represented using 8 bits, allowing for a range of values from 0 to 255 (2^8 - 1). This is typically sufficient for most applications and provides a good balance between precision and data size.
3- 16-bit data size: A 16-bit data size allows for even larger values to be transmitted. Each data element is represented using 16 bits, providing a range of values from 0 to 65,535 (2^16 - 1). This data size option is useful when dealing with larger data values or when higher precision is required.
Indeed, for most applications, the 8-bit and 16-bit data sizes in SPI are sufficient and cover the majority of use cases. The 8-bit data size provides a good balance of precision and data size, while the 16-bit data size offers a wider range of values and higher precision and that's why CubeMX offer those two options .
Thx
Ghofrane
