I do have a (most likely) trivial question for you guys :
I need to catch data from a microprocessor bus and hence I want to utilize DMA transfers in order to address the latency requirements.
The input for the microprocessor bus is realized with 8 digital pins (with contiguous setup) and the question is how to supply the source address (pointer) to CyDmaTdSetAddress ?
We have :
In there DMA_SRC_BASE is defined as CYDEV_PERIPH_BASE and DMA_DST_BASE as CYDEV_SRAM_BASE
What I am missing is the correct source address setup for :
CyDmaTdSetAddress(DMA_TD, LO16((uint32)DTA__PS), LO16((uint32)da));
( da is the receiving char array ... no problem with that)
DTA is the group of digital input pins and the the header file suggest that DTA__PS will give me the address of the pin state register
/* Main Port Registers */
/* Pin State */
#define DTA_PS (* (reg8 *) DTA__PS)
But this doesn't seem to work.
Any suggestions ?
Thanks in advance, regards Achim