How does STM32's SPI handle 25-bit data?

Zeltwanger

How does STM32's SPI handle 25-bit data? [Copy link]

                                 As title

02022409

                                 Can’t you send it in eight digits?

joalin

                                 But the control of the connected chip is 25 bits. If you want to send it eight bits at a time, you have to send 32 bits. I don't know if the latter will affect it, so it's best to send only 25 bits.

alexander007

If the speed requirement is not high, use IO simulation instead!
Whose IC is this? Usually it is a multiple of 8, and the number of useful bits may not be a multiple of 8. So it may be that the redundant bits will not be used. It is better to ask the IC manufacturer before testing!

mr.luoli

Use the program to combine multiple data. For example, if you want to send 8 data, a total of 25 bytes are used.

If the number of bits of the final data is not a multiple of 8, you can use the GPIO method to transmit the extra data less than 8 bits, or send a few more '0's.

Of course, there are many other hardware methods.

taohuahua

                                 I still use IO simulation instead. Thank you for your help.