rpitx/librpitx
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Overwrite dma channel paramter to adpat to pi model

Browse source
This commit is contained in:
F5OEO 2020-07-23 14:10:53 +01:00 committed by f5oeo
parent 5c857b9f7d
commit e48ebd5b23
1 changed files with 12 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/dma.cpp
View file

@ -33,9 +33,19 @@ extern "C"
dma::dma(int Channel,uint32_t CBSize,uint32_t UserMemSize) // Fixme! Need to check to be 256 Aligned for UserMem
{
//Channel DMA is now hardcoded according to Raspi Model (DMA 7 for Pi4, DMA 14 for others)
uint32_t BCM2708_PERI_BASE =bcm_host_get_peripheral_address();
if(BCM2708_PERI_BASE==0xFE000000)
{
channel= 7; // Pi4
}
else
{
channel = 14; // Other Pi
}
dbg_printf(1,"Channel %d CBSize %u UsermemSize %u\n",Channel,CBSize,UserMemSize);
channel=Channel;
mbox.handle = mbox_open();
if (mbox.handle < 0)
{
@ -46,6 +56,7 @@ dma::dma(int Channel,uint32_t CBSize,uint32_t UserMemSize) // Fixme! Need to che
usermemsize=UserMemSize;
GetRpiInfo(); // Fill mem_flag and dram_phys_base
uint32_t MemoryRequired=CBSize*sizeof(dma_cb_t)+UserMemSize*sizeof(uint32_t);
int NumPages=(MemoryRequired/PAGE_SIZE)+1;
dbg_printf(1,"%d Size NUM PAGES %d PAGE_SIZE %d\n",MemoryRequired,NumPages,PAGE_SIZE);