Hi,
I am trying to control a lot of RGB leds at the same time through TLC5955 RGB SPI controllers/
I have 11 of them daisy chained to my STM32F7. Each one of them needs 1 bit (0 for data transfer) and then 768 bits of data (96 bytes). As you can see data is not aligned and i need to add a bit to 0 before each of my 11 controllers.
I managed to do this by sending 1058 (96x11 + 2) bytes through SPI DMA with a huge overhead by populating my buffer bit by bit.
My dream is to be able to send 1 bit and then my 96 bytes. Do you have any idea of how to do this ?
I already tried to send 9 bits ( hspi4.Init.DataSize = SPI_DATASIZE_9BIT;) and then 95 bytes ( hspi4.Init.DataSize = SPI_DATASIZE_8BIT;) with no success.
Do you think it's even possible to send 9 bits through DMA..?
Or to force SPI to send one clock before my 96 bytes DMA transfer ?
Thanks in advance for your help,
Cheers.
