Hi,
I'm playing with SAM3U-EK board and I try to do a DMA transfert from external PSRAM to LCD. I have read the documentation but it's very cloud...
I have done this:
Code:
#define DMA_buffer_size 8
int main (void) {
SystemInit(); /* Initialize the MCU clocks */
GLCD_init(); /* Initialize the GLCD */
GLCD_clear(White); /* Clear the GLCD */
LED_init (); /* Initialize the LEDs */
BOARD_ConfigurePsram();
DMAD_Initialize(DMA_CHANNEL_0);
DMAD_Configure_Buffer(DMA_CHANNEL_0, DMA_TRANSFER_SINGLE, DMA_TRANSFER_SINGLE, 0, 0);
DMAD_Configure_TransferController(DMA_CHANNEL_0, DMA_buffer_size, 3, 3, 0x60000000, 0x62000000);
//0x60000000 start of PSRAM ; 0x62000000 start of LCD
os_sys_init(init); /* Initialize RTX and start init */
return 0;
}
and I do the transfer in a task:
Code:
__task void DMA(void){
while(1){
os_dly_wait (100);
DMAD_BufferTransfer(DMA_CHANNEL_0, 1228800, 0, 0);
while (!DMAD_IsFinished(DMA_CHANNEL_0));
}
}
Could someone tell me difference between DMA_TRANSFER_SINGLE, DMA_TRANSFER_LLI, DMA_TRANSFER_RELOAD and DMA_TRANSFER_CONTIGUOUS ?
Forum
