Bursting from SSP

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by tvink on Fri Feb 27 08:11:47 MST 2015

I am reading UM10430 and trying to figure out how DMA burst would work from a SSP peripheral.

Table 250 indicates that there is a BREQ signal from the SSP0 and SSP1 peripherals.

But when I go to the SSP section of the document there is no DMA info except for table 903 which
describes the two DMA enable bits.  There must be more to it than that!

So how does DMA bursting from the SSP work?  I want to receive 8 frames when my SPI external device
makes an IRQ.  Do I have to make a soft burst request in the ISR for the device?  But then what is the BREQ signal for? and how does it get activated?