Marcelo Rebonatto / Mbed 2 deprecated PMED_Calibra

First Version

Dependencies:   EthernetInterface mbed-rtos mbed

Drivers/dma.c@0:9df41090ba33, 2015-07-21 (annotated)

Committer:
rebonatto
Date:
Tue Jul 21 21:29:49 2015 +0000
Revision:
0:9df41090ba33
First Version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rebonatto 0:9df41090ba33 1 /*
rebonatto 0:9df41090ba33 2 * dma.c
rebonatto 0:9df41090ba33 3 *
rebonatto 0:9df41090ba33 4 * Created on: 03/07/2011
rebonatto 0:9df41090ba33 5 * Author: francisco
rebonatto 0:9df41090ba33 6 */
rebonatto 0:9df41090ba33 7 #include <LPC17xx.h>
rebonatto 0:9df41090ba33 8 #include "dma.h"
rebonatto 0:9df41090ba33 9
rebonatto 0:9df41090ba33 10 #define LPC_GPDMACH ((LPC_GPDMACH_TypeDef **) LPC_GPDMACH0_BASE )
rebonatto 0:9df41090ba33 11
rebonatto 0:9df41090ba33 12 void init_dma()
rebonatto 0:9df41090ba33 13 {
rebonatto 0:9df41090ba33 14 LPC_SC->PCONP |= 1<<29; //Power GPDMA module
rebonatto 0:9df41090ba33 15
rebonatto 0:9df41090ba33 16 LPC_GPDMA->DMACConfig = 1; //Enable GPDMA
rebonatto 0:9df41090ba33 17
rebonatto 0:9df41090ba33 18 //Clear any previous interrupts
rebonatto 0:9df41090ba33 19 LPC_GPDMA->DMACIntTCClear = 0xFF;
rebonatto 0:9df41090ba33 20 LPC_GPDMA->DMACIntErrClr = 0xFF;
rebonatto 0:9df41090ba33 21
rebonatto 0:9df41090ba33 22 NVIC_SetPriority(DMA_IRQn,(1<<__NVIC_PRIO_BITS) - 1);
rebonatto 0:9df41090ba33 23 NVIC_EnableIRQ(DMA_IRQn);
rebonatto 0:9df41090ba33 24 }
rebonatto 0:9df41090ba33 25
rebonatto 0:9df41090ba33 26 void setup_channel(dmaLinkedListNode* pList,int ch,int src,int dst)
rebonatto 0:9df41090ba33 27 {
rebonatto 0:9df41090ba33 28 //Initialize the channel with previously configured LL;
rebonatto 0:9df41090ba33 29 LPC_GPDMACH0->DMACCSrcAddr = pList->sourceAddr;
rebonatto 0:9df41090ba33 30 LPC_GPDMACH0->DMACCDestAddr = pList->destAddr;
rebonatto 0:9df41090ba33 31 LPC_GPDMACH0->DMACCControl = pList->dmaControl;
rebonatto 0:9df41090ba33 32 LPC_GPDMACH0->DMACCLLI = (unsigned long int) pList & 0xFFFFFFFC; //Lower bits must be 0
rebonatto 0:9df41090ba33 33
rebonatto 0:9df41090ba33 34 int transfer_type;
rebonatto 0:9df41090ba33 35 if(src == DMA_MEMORY && dst != DMA_MEMORY)
rebonatto 0:9df41090ba33 36 {
rebonatto 0:9df41090ba33 37 transfer_type = DMA_MEMORY_TO_PERIPHERAL;
rebonatto 0:9df41090ba33 38 src = 0;
rebonatto 0:9df41090ba33 39 }
rebonatto 0:9df41090ba33 40 else if(src != DMA_MEMORY && dst == DMA_MEMORY)
rebonatto 0:9df41090ba33 41 {
rebonatto 0:9df41090ba33 42 transfer_type = DMA_PERIPHERAL_TO_MEMORY;
rebonatto 0:9df41090ba33 43 dst = 0;
rebonatto 0:9df41090ba33 44 }
rebonatto 0:9df41090ba33 45 else if(src == DMA_MEMORY && dst == DMA_MEMORY)
rebonatto 0:9df41090ba33 46 {
rebonatto 0:9df41090ba33 47 transfer_type = DMA_MEMORY_TO_MEMORY;
rebonatto 0:9df41090ba33 48 src=dst = 0;
rebonatto 0:9df41090ba33 49 }
rebonatto 0:9df41090ba33 50 else if(src != DMA_MEMORY && dst != DMA_MEMORY)
rebonatto 0:9df41090ba33 51 transfer_type = DMA_PERIPHERAL_TO_PERIPHERAL;
rebonatto 0:9df41090ba33 52
rebonatto 0:9df41090ba33 53 //Set up all relevant bits
rebonatto 0:9df41090ba33 54 LPC_GPDMACH0->DMACCConfig = (src<<1) | (dst<<5) | (transfer_type<<11) | (1<<15);
rebonatto 0:9df41090ba33 55
rebonatto 0:9df41090ba33 56 //Finally, enable the channel -
rebonatto 0:9df41090ba33 57 LPC_GPDMACH0->DMACCConfig |= 1<<0;
rebonatto 0:9df41090ba33 58 }
rebonatto 0:9df41090ba33 59
rebonatto 0:9df41090ba33 60 void stop_channel()
rebonatto 0:9df41090ba33 61 {
rebonatto 0:9df41090ba33 62 LPC_GPDMACH0->DMACCConfig &= ~(1<<0);
rebonatto 0:9df41090ba33 63 }