- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hello all,
I have the following problem: I use the McBSP peripheral in SPI mode to access an ethercat board. (https://download.beckhoff.com/download/document/io/ethercat-development-products/ethercat_et1100_datasheet_v2i0.pdf)
For this I need to have transfers of over 32 bits, keeping the chip select active. (the first few bytes are address and command info, the latter are data which is read or written)
I have the McBSP running in SPI mode (clock stop, etc.) but I can only send a single word of either 8/12/16/20/24/32 bits. When I send more than 1 word in a transfer, I get additional cycles on the clock line.
For example: when I configure for 8 bits / 2 words, I get
- chip select goes low
- 8 clock cycles
- short pause
- 10 clock cycles
- chip select goes high
When I send more words I get additional bursts of 10 cycles.
Question: Is it possible to send more than 1 word in clock stop/SPI mode on the McBSP??
Is there any other way than software control to get more than 32 bits in a single transfer?
Best regard,
Paul van der Hulst
